OTP-8555 Send message from NIF

New NIF features:

Send messages from a NIF, or from thread created by NIF, to any local
process (enif_send)

Store terms between NIF calls (enif_alloc_env, enif_make_copy)

Create binary terms with user defined memory management
(enif_make_resource_binary)

26 files changed, 1790 insertions, 550 deletions

diff --git a/erts/doc/src/erl_nif.xml b/erts/doc/src/erl_nif.xml
index 03bd42d3b1..f7b7b2f346 100644
--- a/erts/doc/src/erl_nif.xml
+++ b/erts/doc/src/erl_nif.xml
@@ -38,6 +38,18 @@
 	EXPERIMENTAL feature. The interfaces may be changed in any way
 	in coming releases. The plan is however to lift the experimental label and
   maintain interface backward compatibility from R14B.</p>
+  <p>Incompatible changes in <em>R14A</em>:</p>
+  <list>
+    <item>Environment argument removed for <c>enif_alloc</c>,
+    <c>enif_realloc</c>, <c>enif_free</c>, <c>enif_alloc_binary</c>,
+    <c>enif_realloc_binary</c>, <c>enif_release_binary</c>,
+    <c>enif_alloc_resource</c>, <c>enif_release_resource</c>,
+    <c>enif_is_identical</c> and <c>enif_compare</c>.</item>
+    <item>Character encoding argument added to <c>enif_get_atom</c>
+    and <c>enif_make_existing_atom</c>.</item>
+    <item>Module argument added to <c>enif_open_resource_type</c>
+      while changing name spaces of resource types from global to module local.</item>
+  </list>
   <p>Incompatible changes in <em>R13B04</em>:</p>
   <list>
     <item>The function prototypes of the NIFs have  changed to expect <c>argc</c> and <c>argv</c>
@@ -109,9 +121,9 @@ ok
      the new directive <seealso
      marker="doc/reference_manual:code_loading#on_load">on_load</seealso> to automatically
      load the NIF library when the module is loaded.</p>
-     <note><p>A NIF must be exported or used locally by the module (or both).
-     An unused local stub function will be optimized away by the compiler
-      causing loading of the NIF library to fail.</p>
+     <note><p>A NIF does not have to be exported, it can be local to the module.
+     Note however that unused local stub functions will be optimized
+     away by the compiler causing loading of the NIF library to fail.</p>
     </note>
      <p>A loaded NIF library is tied to the Erlang module code version
      that loaded it. If the module is upgraded with a new version, the
@@ -122,7 +134,7 @@ ok
      will be shared as well. To avoid unintentionally shared static
      data, each Erlang module code can keep its own private data. This
      private data can be set when the NIF library is loaded and
-     then retrieved by calling <seealso marker="#enif_priv_data">enif_priv_data()</seealso>.</p>
+     then retrieved by calling <seealso marker="#enif_priv_data">enif_priv_data</seealso>.</p>
     <p>There is no way to explicitly unload a NIF library. A library will be
      automatically unloaded when the module code that it belongs to is purged
      by the code server. A NIF library will also be unloaded if it is replaced
@@ -137,14 +149,20 @@ ok
     <taglist>
       <tag>Read and write Erlang terms</tag>
       <item><p>Any Erlang terms can be passed to a NIF as function arguments and
-      be returned as function return values. The terms are of C-type <c>ERL_NIF_TERM</c>
+      be returned as function return values. The terms are of C-type
+      <seealso marker="#ERL_NIF_TERM">ERL_NIF_TERM</seealso>
       and can only be read or written using API functions. Most functions to read
       the content of a term are prefixed <c>enif_get_</c> and usually return
       true (or false) if the term was of the expected type (or not).    
       The functions to write terms are all prefixed <c>enif_make_</c> and usually
       return the created <c>ERL_NIF_TERM</c>. There are also some functions
       to query terms, like <c>enif_is_atom</c>, <c>enif_is_identical</c> and
-      <c>enif_compare</c>.</p></item>
+      <c>enif_compare</c>.</p>
+      <p>All terms of type <c>ERL_NIF_TERM</c> belong to an environment of type
+      <seealso marker="#ErlNifEnv">ErlNifEnv</seealso>. The lifetime of a term is
+      controlled by the lifetime of its environment object. All API functions that read
+      or write terms has the environment, that the term belongs to, as the first
+      function argument.</p></item>
       <tag>Binaries</tag>
       <item><p>Terms of type binary are accessed with the help of the struct type
       <seealso marker="#ErlNifBinary">ErlNifBinary</seealso>    
@@ -172,28 +190,29 @@ ok
       <item><p>The use of resource objects is a way to return pointers to
       native data structures from a NIF in a safe way. A resource object is
       just a block of memory allocated with
-      <seealso marker="#enif_alloc_resource">enif_alloc_resource()</seealso>.
+      <seealso marker="#enif_alloc_resource">enif_alloc_resource</seealso>.
       A handle ("safe pointer") to this memory block can then be returned to Erlang by the use of
-      <seealso marker="#enif_make_resource">enif_make_resource()</seealso>.
+      <seealso marker="#enif_make_resource">enif_make_resource</seealso>.
       The term returned by <c>enif_make_resource</c>
       is totally opaque in nature. It can be stored and passed between processses
       on the same node, but the only real end usage is to pass it back as argument to a NIF.
-      The NIF can then do <seealso marker="#enif_get_resource">enif_get_resource()</seealso>
+      The NIF can then do <seealso marker="#enif_get_resource">enif_get_resource</seealso>
       and get back a pointer to the memory block that is guaranteed to still be
       valid. A resource object will not be deallocated until the last handle term
       has been garbage collected by the VM and the resource has been
-      released with <seealso marker="#enif_release_resource">enif_release_resource()</seealso>
+      released with <seealso marker="#enif_release_resource">enif_release_resource</seealso>
       (not necessarily in that order).</p>      
       <p>All resource objects are created as instances of some <em>resource type</em>.
       This makes resources from different modules to be distinguishable. 
       A resource type is created by calling
-      <seealso marker="#enif_open_resource_type">enif_open_resource_type()</seealso>
+      <seealso marker="#enif_open_resource_type">enif_open_resource_type</seealso>
       when a library is loaded. Objects of that resource type can then later be allocated
       and <c>enif_get_resource</c> verifies that the resource is of the expected type.
       A resource type can have a user supplied destructor function that is
       automatically called when resources of that type are released (by either
       the garbage collector or <c>enif_release_resource</c>). Resource types
-      are uniquely identified by a supplied name string.</p>
+      are uniquely identified by a supplied name string and the name of the
+      implementing module.</p>
       <p>Resource types support upgrade in runtime by allowing a loaded NIF
       library to takeover an already existing resource type and thereby
       "inherit" all existing objects of that type. The destructor of the new
@@ -208,7 +227,7 @@ ok
       <p/>
       <code type="none">
     ERL_NIF_TERM term;
-    MyStruct* ptr = enif_alloc_resource(env, my_resource_type, sizeof(MyStruct));
+    MyStruct* ptr = enif_alloc_resource(my_resource_type, sizeof(MyStruct));
 
     /* initialize struct ... */
 
@@ -218,21 +237,31 @@ ok
         /* store 'ptr' in static variable, private data or other resource object */
     }
     else {
-        enif_release_resource(env, obj);
+        enif_release_resource(obj);
         /* resource now only owned by "Erlang" */
     }
     return term;
 }
 </code>
-
+      <p>Another usage of resource objects is to create binary terms with
+      user defined memory management.
+      <seealso marker="#enif_make_resource_binary">enif_make_resource_binary</seealso>
+      will create a binary term that is connected to a resource object. The
+      destructor of the resource will be called when the binary is garbage
+      collected, at which time the binary data can be released. An example of
+      this can be a binary term consisting of data from a <c>mmap</c>'ed file.
+      The destructor can then do <c>munmap</c> to release the memory
+      region.</p>
       </item>
       <tag>Threads and concurrency</tag>
       <item><p>A NIF is thread-safe without any explicit synchronization as
       long as it acts as a pure function and only reads the supplied
       arguments. As soon as you write towards a shared state either through
       static variables or <seealso marker="#enif_priv_data">enif_priv_data</seealso>
-      you need to supply your own explicit synchronization. Resource objects
-      will also require synchronization if you treat them as mutable.</p>
+      you need to supply your own explicit synchronization. This includes terms
+      in process independent environments that are shared between threads.
+      Resource objects will also require synchronization if you treat them as
+      mutable.</p>
       <p>The library initialization callbacks <c>load</c>, <c>reload</c> and
       <c>upgrade</c> are all thread-safe even for shared state data.</p>
       <p>Avoid doing lengthy work in NIF calls as that may degrade the
@@ -265,7 +294,7 @@ ok
         and there is no previously loaded library for this module.</p>
         <p><c>*priv_data</c> can be set to point to some private data
            that the library needs in order to keep a state between NIF
-           calls. <c>enif_priv_data()</c> will return this pointer.
+           calls. <c>enif_priv_data</c> will return this pointer.
            <c>*priv_data</c> will be initialized to NULL when <c>load</c> is
            called.</p> 
         <p><c>load_info</c> is the second argument to <seealso
@@ -317,19 +346,37 @@ ok
        <item>
         <p>Variables of type <c>ERL_NIF_TERM</c> can refer to any Erlang term.
         This is an opaque type and values of it can only by used either as
-        arguments to API functions or as return values from NIFs. A variable of
-        type <c>ERL_NIF_TERM</c> is only valid until the NIF call, where it was
-        obtained, returns.</p>
+        arguments to API functions or as return values from NIFs. All
+        <c>ERL_NIF_TERM</c>'s belong to an environment
+        (<seealso marker="#ErlNifEnv">ErlNifEnv</seealso>). A term can not be
+        destructed individually, it is valid until its environment is destructed.</p>
       </item>
      <tag><marker id="ErlNifEnv"/>ErlNifEnv</tag>
       <item>
-        <p><c>ErlNifEnv</c> contains information about the context in
-          which a NIF call is made. This pointer should not be
-          dereferenced in any way, but only passed on to API
-          functions. An <c>ErlNifEnv</c> pointer is only valid until
-          the function, where it was supplied as argument,
-          returns. It is thus useless and dangerous to store <c>ErlNifEnv</c>
-          pointers in between NIF calls.</p>
+        <p><c>ErlNifEnv</c> represents an environment that can host Erlang terms.
+        All terms in an environment are valid as long as the environment is valid.
+        <c>ErlNifEnv</c> is an opaque type and pointers to it can only be passed
+        on to API functions. There are two types of environments; process
+        bound and process independent.</p>
+        <p>A <em>process bound environment</em> is passed as the first argument to all NIFs.
+        All function arguments passed to a NIF will belong to that environment.
+        The return value from a NIF must also be a term belonging to the same
+        environment.
+        In addition a process bound environment contains transient information
+        about the calling Erlang process. The environment is only valid in the 
+        thread where it was supplied as argument until the NIF returns. It is
+        thus useless and dangerous to store pointers to process bound
+        environments between NIF calls. </p>
+        <p>A <em>process independent environment</em> is created by calling
+        <seealso marker="#enif_alloc_env">enif_alloc_env</seealso>. It can be
+        used to store terms beteen NIF calls and to send terms with
+        <seealso marker="#enif_send">enif_send</seealso>. A process
+        independent environment with all its terms is valid until you explicitly
+        invalidates it with <seealso marker="#enif_free_env">enif_free_env</seealso>
+        or <c>enif_send</c>.</p>
+        <p>All elements of a list/tuple must belong to the same environment as the
+        list/tuple itself. Terms can be copied between environments with
+        <seealso marker="#enif_make_copy">enif_make_copy</seealso>.</p>
       </item>
     <tag><marker id="ErlNifFunc"/>ErlNifFunc</tag>
      <item>
@@ -363,7 +410,18 @@ typedef struct {
         <p><c>ErlNifBinary</c> contains transient information about an
           inspected binary term. <c>data</c> is a pointer to a buffer
           of <c>size</c> bytes with the raw content of the binary.</p>
+          <p>Note that <c>ErlNifBinary</c> is a semi-opaque type and you are
+          only allowed to read fields <c>size</c> and <c>data</c>.</p>
       </item>
+      <tag><marker id="ErlNifPid"/>ErlNifPid</tag>
+       <item>
+          <p><c>ErlNifPid</c> is a process identifier (pid). In contrast to
+          pid terms (instances of <c>ERL_NIF_TERM</c>), <c>ErlNifPid</c>'s are self
+          contained and not bound to any
+          <seealso marker="#ErlNifEnv">environment</seealso>. <c>ErlNifPid</c>
+          is an opaque type.</p>
+        </item>
+
       <tag><marker id="ErlNifResourceType"/>ErlNifResourceType</tag>
        <item>
           <p>Each instance of <c>ErlNifResourceType</c> represent a class of
@@ -388,9 +446,9 @@ typedef enum {
     ERL_NIF_LATIN1
 }ErlNifCharEncoding;
 </code>
-              <p>The character encoding used in strings. The only supported
-              encoding is currently <c>ERL_NIF_LATIN1</c> for iso-latin-1
-              (8-bit ascii).</p>
+              <p>The character encoding used in strings and atoms. The only
+              supported encoding is currently <c>ERL_NIF_LATIN1</c> for
+              iso-latin-1 (8-bit ascii).</p>
             </item>
             <tag><marker id="ErlNifSysInfo"/>ErlNifSysInfo</tag>
              <item>
@@ -407,24 +465,40 @@ typedef enum {
       <fsummary>Allocate dynamic memory.</fsummary>
       <desc><p>Allocate memory of <c>size</c> bytes. Return NULL if allocation failed.</p></desc>
     </func>
-    <func><name><ret>int</ret><nametext>enif_alloc_binary(ErlNifEnv* env, unsigned size, ErlNifBinary* bin)</nametext></name>
+    <func><name><ret>int</ret><nametext>enif_alloc_binary(size_t size, ErlNifBinary* bin)</nametext></name>
       <fsummary>Create a new binary.</fsummary>
       <desc><p>Allocate a new binary of size <c>size</c>
       bytes. Initialize the structure pointed to by <c>bin</c> to
       refer to the allocated binary. The binary must either be released by 
-      <seealso marker="#enif_release_binary">enif_release_binary()</seealso> 
+      <seealso marker="#enif_release_binary">enif_release_binary</seealso> 
       or ownership transferred to an Erlang term with 
-      <seealso marker="#enif_make_binary">enif_make_binary()</seealso>. 
+      <seealso marker="#enif_make_binary">enif_make_binary</seealso>. 
       An allocated (and owned) <c>ErlNifBinary</c> can be kept between NIF
       calls.</p>
-        <p>Return false if allocation failed.</p>
+        <p>Return true on success or false if allocation failed.</p>
       </desc>
     </func>
-    <func><name><ret>void*</ret><nametext>enif_alloc_resource(ErlNifEnv* env, ErlNifResourceType* type, unsigned size)</nametext></name>
+    <func><name><ret>ErlNifEnv*</ret><nametext>enif_alloc_env()</nametext></name>
+      <fsummary>Create a new environment</fsummary>
+      <desc><p>Allocate a new process independent environment. The environment can
+      be used to hold terms that is not bound to any process. Such terms can
+      later be copied to a process environment with
+      <seealso marker="#enif_make_copy">enif_make_copy</seealso>
+      or be sent to a process as a message with <seealso marker="#enif_send">enif_send</seealso>.</p>
+      <p>Return pointer to the new environment.</p>
+      </desc>
+    </func>
+    <func><name><ret>void*</ret><nametext>enif_alloc_resource(ErlNifResourceType* type, unsigned size)</nametext></name>
       <fsummary>Allocate a memory managed resource object</fsummary>
       <desc><p>Allocate a memory managed resource object of type <c>type</c> and size <c>size</c> bytes.</p></desc>
     </func>
-    <func><name><ret>int</ret><nametext>enif_compare(ErlNifEnv* env, ERL_NIF_TERM lhs, ERL_NIF_TERM rhs)</nametext></name>
+    <func><name><ret>void</ret><nametext>enif_clear_env(ErlNifEnv* env)</nametext></name>
+      <fsummary>Clear an environment for reuse.</fsummary>
+      <desc><p>Free all terms in an environment and clear it for reuse. The environment must
+      have been allocated with <seealso marker="#enif_alloc_env">enif_alloc_env</seealso>.
+      </p></desc>
+    </func>
+    <func><name><ret>int</ret><nametext>enif_compare(ERL_NIF_TERM lhs, ERL_NIF_TERM rhs)</nametext></name>
       <fsummary>Compare two terms</fsummary>
       <desc><p>Return an integer less than, equal to, or greater than
       zero if <c>lhs</c> is found, respectively, to be less than,
@@ -434,88 +508,98 @@ typedef enum {
     </func>
     <func><name><ret>void</ret><nametext>enif_cond_broadcast(ErlNifCond *cnd)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_cond_broadcast">erl_drv_cond_broadcast()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_cond_broadcast">erl_drv_cond_broadcast</seealso>.
           </p></desc>
     </func>
     <func><name><ret>ErlNifCond*</ret><nametext>enif_cond_create(char *name)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_cond_create">erl_drv_cond_create()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_cond_create">erl_drv_cond_create</seealso>.
           </p></desc>
     </func>
     <func><name><ret>void</ret><nametext>enif_cond_destroy(ErlNifCond *cnd)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_cond_destroy">erl_drv_cond_destroy()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_cond_destroy">erl_drv_cond_destroy</seealso>.
           </p></desc>
     </func>
     <func><name><ret>void</ret><nametext>enif_cond_signal(ErlNifCond *cnd)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_cond_signal">erl_drv_cond_signal()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_cond_signal">erl_drv_cond_signal</seealso>.
           </p></desc>
     </func>
     <func><name><ret>void</ret><nametext>enif_cond_wait(ErlNifCond *cnd, ErlNifMutex *mtx)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_cond_wait">erl_drv_cond_wait()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_cond_wait">erl_drv_cond_wait</seealso>.
           </p></desc>
     </func>
     <func><name><ret>int</ret><nametext>enif_equal_tids(ErlNifTid tid1, ErlNifTid tid2)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_equal_tids">erl_drv_equal_tids()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_equal_tids">erl_drv_equal_tids</seealso>.
           </p></desc>
     </func>
     <func><name><ret>void</ret><nametext>enif_free(ErlNifEnv* env, void* ptr)</nametext></name>
       <fsummary>Free dynamic memory</fsummary>
       <desc><p>Free memory allocated by <c>enif_alloc</c>.</p></desc>
     </func>
-    <func><name><ret>int</ret><nametext>enif_get_atom(ErlNifEnv* env, 
-                  ERL_NIF_TERM term, char* buf, unsigned size)
-                             </nametext></name>
+    <func><name><ret>void</ret><nametext>enif_free_env(ErlNifEnv* env)</nametext></name>
+      <fsummary>Free an environment allocated with enif_alloc_env</fsummary>
+      <desc><p>Free an environment allocated with <seealso marker="#enif_alloc_env">enif_alloc_env</seealso>.
+      All terms created in the environment will be freed as well.</p></desc>
+    </func>
+    <func><name><ret>int</ret><nametext>enif_get_atom(ErlNifEnv* env, ERL_NIF_TERM term, char* buf, unsigned size, ErlNifCharEncoding encode)</nametext></name>
       <fsummary>Get the text representation of an atom term</fsummary>
       <desc><p>Write a null-terminated string, in the buffer pointed to by
               <c>buf</c> of size <c>size</c>, consisting of the string 
-              representation of the atom <c>term</c>. Return the number of bytes
-              written (including terminating null character) or 0 if
+              representation of the atom <c>term</c> with encoding
+              <seealso marker="#ErlNifCharEncoding">encode</seealso>. Return
+              the number of bytes written (including terminating null character) or 0 if
               <c>term</c> is not an atom with maximum length of 
               <c>size-1</c>.</p></desc>
     </func>
-    <func><name><ret>int</ret><nametext>enif_get_atom_length(ErlNifEnv* env, ERL_NIF_TERM term, unsigned* len)</nametext></name>
+    <func><name><ret>int</ret><nametext>enif_get_atom_length(ErlNifEnv* env, ERL_NIF_TERM term, unsigned* len, ErlNifCharEncoding encode)</nametext></name>
       <fsummary>Get the length of atom <c>term</c>.</fsummary>
       <desc><p>Set <c>*len</c> to the length (number of bytes excluding
-      terminating null character) of <c>term</c> or return false if
-      <c>term</c> is not an atom.</p></desc>
+      terminating null character) of the atom <c>term</c> with encoding
+      <c>encode</c>. Return true on success or false if <c>term</c> is not an
+      atom.</p></desc>
     </func>
     <func><name><ret>int</ret><nametext>enif_get_double(ErlNifEnv* env, ERL_NIF_TERM term, double* dp)</nametext></name>
       <fsummary>Read a floating-point number term.</fsummary>
       <desc><p>Set <c>*dp</c> to the floating point value of
-      <c>term</c> or return false if <c>term</c> is not a float.</p></desc>
+      <c>term</c>. Return true on success or false if <c>term</c> is not a float.</p></desc>
     </func>
     <func><name><ret>int</ret><nametext>enif_get_int(ErlNifEnv* env, ERL_NIF_TERM term, int* ip)</nametext></name>
-      <fsummary>Read an integer term.</fsummary>
+      <fsummary>Read an integer term</fsummary>
       <desc><p>Set <c>*ip</c> to the integer value of
-      <c>term</c> or return false if <c>term</c> is not an integer or is
-      outside the bounds of type <c>int</c></p></desc>
+      <c>term</c>. Return true on success or false if <c>term</c> is not an
+      integer or is outside the bounds of type <c>int</c></p></desc>
+    </func>
+    <func><name><ret>int</ret><nametext>enif_get_local_pid(ErlNifEnv* env, ERL_NIF_TERM term, ErlNifPid* pid)</nametext></name>
+    <fsummary>Read an local pid term</fsummary>
+    <desc><p>If <c>term</c> is the pid of a node local process, initialize the
+    pid variable <c>*pid</c> from it and return true. Otherwise return false.
+    No check if the process is alive is done.</p></desc>
     </func>
     <func><name><ret>int</ret><nametext>enif_get_list_cell(ErlNifEnv* env, ERL_NIF_TERM list, ERL_NIF_TERM* head, ERL_NIF_TERM* tail)</nametext></name>
       <fsummary>Get head and tail from a list</fsummary>
       <desc><p>Set <c>*head</c> and <c>*tail</c> from
-      <c>list</c> or return false if <c>list</c> is not a non-empty
-      list.</p></desc>
+      <c>list</c> and return true, or return false if <c>list</c> is not a
+      non-empty list.</p></desc>
     </func>
     <func><name><ret>int</ret><nametext>enif_get_list_length(ErlNifEnv* env, ERL_NIF_TERM term, unsigned* len)</nametext></name>
       <fsummary>Get the length of list <c>term</c>.</fsummary>
-      <desc><p>Set <c>*len</c> to the length of <c>term</c> or return
-      false if <c>term</c> is not a list.</p></desc>
+      <desc><p>Set <c>*len</c> to the length of list <c>term</c> and return true,
+      or return false if <c>term</c> is not a list.</p></desc>
     </func>
     <func><name><ret>int</ret><nametext>enif_get_long(ErlNifEnv* env, ERL_NIF_TERM term, long int* ip)</nametext></name>
       <fsummary>Read an long integer term.</fsummary>
-      <desc><p>Set <c>*ip</c> to the long integer value of
-      <c>term</c> or return false if <c>term</c> is not an integer or is
+      <desc><p>Set <c>*ip</c> to the long integer value of <c>term</c> and
+      return true, or return false if <c>term</c> is not an integer or is
       outside the bounds of type <c>long int</c>.</p></desc>
     </func>
     <func><name><ret>int</ret><nametext>enif_get_resource(ErlNifEnv* env, ERL_NIF_TERM term, ErlNifResourceType* type, void** objp)</nametext></name>
       <fsummary>Get the pointer to a resource object</fsummary>
-      <desc><p>Set <c>*objp</c> to point to the resource object referred to by <c>term</c>.
-      The pointer is valid until the calling NIF returns and should not be released.</p>
-      <p>Return false if <c>term</c> is not a handle to a resource object
+      <desc><p>Set <c>*objp</c> to point to the resource object referred to by <c>term</c>.</p>
+      <p>Return true on success or false if <c>term</c> is not a handle to a resource object
       of type <c>type</c>.</p></desc>
     </func>
     <func><name><ret>int</ret><nametext>enif_get_string(ErlNifEnv* env, 
@@ -540,27 +624,27 @@ typedef enum {
       <c>*arity</c> to the number of elements. Note that the array
       is read-only and <c>(*array)[N-1]</c> will be the Nth element of
       the tuple. <c>*array</c> is undefined if the arity of the tuple
-      is zero.</p><p>Return false if <c>term</c> is not a
+      is zero.</p><p>Return true on success or false if <c>term</c> is not a
       tuple.</p></desc>
     </func>
     <func><name><ret>int</ret><nametext>enif_get_uint(ErlNifEnv* env, ERL_NIF_TERM term, unsigned int* ip)</nametext></name>
       <fsummary>Read an unsigned integer term.</fsummary>
-      <desc><p>Set <c>*ip</c> to the unsigned integer value of
-      <c>term</c> or return false if <c>term</c> is not an unsigned integer or is
-      outside the bounds of type <c>unsigned int</c></p></desc>
+      <desc><p>Set <c>*ip</c> to the unsigned integer value of <c>term</c> and
+      return true, or return false if <c>term</c> is not an unsigned integer or
+      is outside the bounds of type <c>unsigned int</c>.</p></desc>
     </func>
 
     <func><name><ret>int</ret><nametext>enif_get_ulong(ErlNifEnv* env, ERL_NIF_TERM term, unsigned long* ip)</nametext></name>
       <fsummary>Read an unsigned integer term.</fsummary>
-      <desc><p>Set <c>*ip</c> to the unsigned long integer value of
-      <c>term</c> or return false if <c>term</c> is not an unsigned integer or is
-      outside the bounds of type <c>unsigned long</c></p></desc>
+      <desc><p>Set <c>*ip</c> to the unsigned long integer value of <c>term</c>
+      and return true, or return false if <c>term</c> is not an unsigned integer or is
+      outside the bounds of type <c>unsigned long</c>.</p></desc>
     </func>
     <func><name><ret>int</ret><nametext>enif_inspect_binary(ErlNifEnv* env, ERL_NIF_TERM bin_term, ErlNifBinary* bin)</nametext></name>
       <fsummary>Inspect the content of a binary</fsummary>
       <desc><p>Initialize the structure pointed to by <c>bin</c> with 
               information about the binary term
-      <c>bin_term</c>. Return false if <c>bin_term</c> is not a binary.</p></desc> 
+      <c>bin_term</c>. Return true on success or false if <c>bin_term</c> is not a binary.</p></desc> 
     </func>
     <func><name><ret>int</ret><nametext>enif_inspect_iolist_as_binary(ErlNifEnv* 
                                 env, ERL_NIF_TERM term, ErlNifBinary* bin)
@@ -569,7 +653,7 @@ typedef enum {
       <desc><p>Initialize the structure pointed to by <c>bin</c> with one
       continuous buffer with the same byte content as <c>iolist</c>. As with 
       inspect_binary, the data pointed to by <c>bin</c> is transient and does 
-      not need to be released. Return false if <c>iolist</c> is not an
+      not need to be released. Return true on success or false if <c>iolist</c> is not an
       iolist.</p>
       </desc> 
     </func>
@@ -589,7 +673,7 @@ typedef enum {
       <fsummary>Determine if a term is a fun</fsummary>
       <desc><p>Return true if <c>term</c> is a fun.</p></desc>
     </func>
-    <func><name><ret>int</ret><nametext>enif_is_identical(ErlNifEnv* env, ERL_NIF_TERM lhs, ERL_NIF_TERM rhs)</nametext></name>
+    <func><name><ret>int</ret><nametext>enif_is_identical(ERL_NIF_TERM lhs, ERL_NIF_TERM rhs)</nametext></name>
       <fsummary>Erlang operator =:=</fsummary>
       <desc><p>Return true if the two terms are identical. Corresponds to the
       Erlang operators <c>=:=</c> and
@@ -603,7 +687,6 @@ typedef enum {
       <fsummary>Determine if a term is a port</fsummary>
       <desc><p>Return true if <c>term</c> is a port.</p></desc>
     </func>
-
     <func><name><ret>int</ret><nametext>enif_is_ref(ErlNifEnv* env, ERL_NIF_TERM term)</nametext></name>
       <fsummary>Determine if a term is a reference</fsummary>
       <desc><p>Return true if <c>term</c> is a reference.</p></desc>
@@ -616,16 +699,23 @@ typedef enum {
       <fsummary>Determine if a term is a list</fsummary>
       <desc><p>Return true if <c>term</c> is a list.</p></desc>
     </func>
+    <func><name><ret>int</ret><nametext>enif_keep_resource(void* obj)</nametext></name>
+      <fsummary>Add a reference to a resource object</fsummary>
+      <desc><p>Add a reference to resource object <c>obj</c> obtained from
+      <seealso marker="#enif_alloc_resource">enif_alloc_resource</seealso>.
+      Each call to <c>enif_keep_resource</c> for an object must be balanced by
+      a call to <seealso marker="#enif_release_resource">enif_release_resource</seealso>
+      before the object will be destructed.</p></desc>
+    </func>
     <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_atom(ErlNifEnv* env, const char* name)</nametext></name>
       <fsummary>Create an atom term</fsummary>
-      <desc><p>Create an atom term from the null-terminated C-string <c>name</c>.
-      Unlike other terms, atom terms may be saved and used between NIF calls.</p></desc>
+      <desc><p>Create an atom term from the null-terminated C-string <c>name</c>
+      with iso-latin-1 encoding.</p></desc>
     </func>
     <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_atom_len(ErlNifEnv* env, const char* name, size_t len)</nametext></name>
       <fsummary>Create an atom term</fsummary>
       <desc><p>Create an atom term from the string <c>name</c> with length <c>len</c>.
-      Null-characters are treated as any other characters.
-      Unlike other terms, atom terms may be saved and used between NIF calls.</p></desc>
+      Null-characters are treated as any other characters.</p></desc>
     </func>
     <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_badarg(ErlNifEnv* env)</nametext></name>
       <fsummary>Make a badarg exception.</fsummary>
@@ -638,22 +728,30 @@ typedef enum {
               <c>bin</c> should be considered read-only for the rest of the NIF
               call and then as released.</p></desc>
     </func>
+    <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_copy(ErlNifEnv* dst_env, ERL_NIF_TERM src_term)</nametext></name>
+      <fsummary>Make a copy of a term.</fsummary>
+      <desc><p>Make a copy of term <c>src_term</c>. The copy will be created in
+      environment <c>dst_env</c>. The source term may be located in any
+      environment.</p></desc>        
+    </func>
     <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_double(ErlNifEnv* env, double d)</nametext></name>
       <fsummary>Create a floating-point term</fsummary>
       <desc><p>Create a floating-point term from a <c>double</c>.</p></desc>
     </func>
-    <func><name><ret>int</ret><nametext>enif_make_existing_atom(ErlNifEnv* env, const char* name, ERL_NIF_TERM* atom)</nametext></name>
+    <func><name><ret>int</ret><nametext>enif_make_existing_atom(ErlNifEnv* env, const char* name, ERL_NIF_TERM* atom, ErlNifCharEncoding encode)</nametext></name>
       <fsummary>Create an existing atom term</fsummary>
       <desc><p>Try to create the term of an already existing atom from
-      the null-terminated C-string <c>name</c>. If the atom already exists store the
-      term in <c>*atom</c> and return true, otherwise return
-      false.</p></desc>
+      the null-terminated C-string <c>name</c> with encoding
+      <seealso marker="#ErlNifCharEncoding">encode</seealso>. If the atom
+      already exists store the term in <c>*atom</c> and return true, otherwise
+      return false.</p></desc>
     </func>
-    <func><name><ret>int</ret><nametext>enif_make_existing_atom_len(ErlNifEnv* env, const char* name, size_t len, ERL_NIF_TERM* atom)</nametext></name>
+    <func><name><ret>int</ret><nametext>enif_make_existing_atom_len(ErlNifEnv* env, const char* name, size_t len, ERL_NIF_TERM* atom, ErlNifCharEncoding encoding)</nametext></name>
       <fsummary>Create an existing atom term</fsummary>
       <desc><p>Try to create the term of an already existing atom from the
-      string <c>name</c> with length <c>len</c>. Null-characters are treated
-      as any other characters. If the atom already exists store the term
+      string <c>name</c> with length <c>len</c> and encoding
+      <seealso marker="#ErlNifCharEncoding">encode</seealso>. Null-characters
+      are treated as any other characters. If the atom already exists store the term
       in <c>*atom</c> and return true, otherwise return false.</p></desc>
     </func>
     <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_int(ErlNifEnv* env, int i)</nametext></name>
@@ -694,7 +792,7 @@ typedef enum {
       <fsummary>Create an integer term from a long int</fsummary>
       <desc><p>Create an integer term from a <c>long int</c>.</p></desc>
     </func>
-    <func><name><ret>unsigned char*</ret><nametext>enif_make_new_binary(ErlNifEnv* env, unsigned size, ERL_NIF_TERM* termp)</nametext></name>
+    <func><name><ret>unsigned char*</ret><nametext>enif_make_new_binary(ErlNifEnv* env, size_t size, ERL_NIF_TERM* termp)</nametext></name>
       <fsummary>Allocate and create a new binary term</fsummary>
       <desc><p>Allocate a binary of size <c>size</c> bytes and create an owning
       term. The binary data is mutable until the calling NIF returns. This is a
@@ -704,6 +802,10 @@ typedef enum {
       reallocated.</p><p>Return a pointer to the raw binary data and set
       <c>*termp</c> to the binary term.</p></desc>
     </func>
+    <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_pid(ErlNifEnv* env, const ErlNifPid* pid)</nametext></name>
+      <fsummary>Make a pid term</fsummary>
+      <desc><p>Make a pid term from <c>*pid</c>.</p></desc>
+    </func>
     <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_ref(ErlNifEnv* env)</nametext></name>
       <fsummary>Create a reference.</fsummary>
       <desc><p>Create a reference like <seealso marker="erlang#make_ref-0">erlang:make_ref/0</seealso>.</p></desc>
@@ -719,6 +821,29 @@ typedef enum {
       same node. Other operations such as matching or <c>term_to_binary</c>
       will have unpredictable (but harmless) results.</p></desc>
     </func>
+    <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_resource_binary(ErlNifEnv* env, void* obj, const void* data, size_t size)</nametext></name>
+      <fsummary>Create a custom binary term</fsummary>
+      <desc><p>Create a binary term that is memory managed by a resource object
+      <c>obj</c> obtained by <seealso marker="#enif_alloc_resource">enif_alloc_resource</seealso>.
+      The returned binary term will consist of <c>size</c> bytes pointed to
+      by <c>data</c>. This raw binary data must be kept readable and unchanged
+      until the destructor of the resource is called. The binary data may be
+      stored external to the resource object in which case it is the responsibility
+      of the destructor to release the data.</p>
+      <p>Several binary terms may be managed by the same resource object. The
+      destructor will not be called until the last binary is garbage collected.
+      This can be useful as a way to return different parts of a larger binary
+      buffer.</p>
+      <p>As with <seealso marker="#enif_make_resource">enif_make_resource</seealso>,
+      no ownership transfer is done. The resource still needs to be released with
+      <seealso marker="#enif_release_resource">enif_release_resource</seealso>.</p>
+      </desc>
+    </func>
+    <func><name><ret>ErlNifPid*</ret><nametext>enif_self(ErlNifEnv* caller_env, ErlNifPid* pid)</nametext></name>
+      <fsummary>Get the pid of the calling process.</fsummary>
+      <desc><p>Initialize the pid variable <c>*pid</c> to represent the
+      calling process. Return <c>pid</c>.</p></desc>
+    </func>
     <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_string(ErlNifEnv* env, const char* string, ErlNifCharEncoding encoding)</nametext></name>
       <fsummary>Create a string.</fsummary>
       <desc><p>Create a list containing the characters of the
@@ -731,7 +856,7 @@ typedef enum {
       Null-characters are treated as any other characters.</p></desc>
     </func>
     <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_sub_binary(ErlNifEnv* 
-      env, ERL_NIF_TERM bin_term, unsigned pos, unsigned size)</nametext></name>
+      env, ERL_NIF_TERM bin_term, size_t pos, size_t size)</nametext></name>
       <fsummary>Make a subbinary term.</fsummary>
       <desc><p>Make a subbinary of binary <c>bin_term</c>, starting at 
               zero-based position <c>pos</c> with a length of <c>size</c> bytes. 
@@ -775,30 +900,31 @@ typedef enum {
     </func>
     <func><name><ret>ErlNifMutex*</ret><nametext>enif_mutex_create(char *name)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_mutex_create">erl_drv_mutex_create()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_mutex_create">erl_drv_mutex_create</seealso>.
     </p></desc>
     </func>
     <func><name><ret>void</ret><nametext>enif_mutex_destroy(ErlNifMutex *mtx)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_mutex_destroy">erl_drv_mutex_destroy()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_mutex_destroy">erl_drv_mutex_destroy</seealso>.
           </p></desc>
     </func>
     <func><name><ret>void</ret><nametext>enif_mutex_lock(ErlNifMutex *mtx)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_mutex_lock">erl_drv_mutex_lock()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_mutex_lock">erl_drv_mutex_lock</seealso>.
           </p></desc>
     </func>
     <func><name><ret>int</ret><nametext>enif_mutex_trylock(ErlNifMutex *mtx)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_mutex_trylock">erl_drv_mutex_trylock()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_mutex_trylock">erl_drv_mutex_trylock</seealso>.
           </p></desc>
     </func>
     <func><name><ret>void</ret><nametext>enif_mutex_unlock(ErlNifMutex *mtx)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_mutex_unlock">erl_drv_mutex_unlock()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_mutex_unlock">erl_drv_mutex_unlock</seealso>.
           </p></desc>
     </func>
-    <func><name><ret>ErlNifResourceType*</ret><nametext>enif_open_resource_type(ErlNifEnv* env, const char* name,
+    <func><name><ret>ErlNifResourceType*</ret><nametext>enif_open_resource_type(ErlNifEnv* env,
+                             const char* module_str, const char* name,
                              ErlNifResourceDtor* dtor, ErlNifResourceFlags flags, ErlNifResourceFlags* tried)</nametext></name>
       <fsummary>Create or takeover a resource type</fsummary>
       <desc><p>Create or takeover a resource type identified by the string
@@ -812,10 +938,10 @@ typedef enum {
                The supplied destructor <c>dtor</c> will be called both for existing instances
                as well as new instances not yet created by the calling NIF library.</item>            
       </taglist>
-      <p>The two flag values can be combined with bitwise-or. To avoid unintentional
-      name clashes a good practice is to include the module name as part of the
-      type <c>name</c>. The <c>dtor</c> may  be <c>NULL</c> in case no destructor
-      is needed.</p>
+      <p>The two flag values can be combined with bitwise-or. The name of the
+      resource type is local to the calling module. Argument <c>module_str</c>
+      is not (yet) used and must be NULL. The <c>dtor</c> may  be <c>NULL</c>
+      in case no destructor is needed.</p>
       <p>On success, return a pointer to the resource type and <c>*tried</c>
       will be set to either <c>ERL_NIF_RT_CREATE</c> or
       <c>ERL_NIF_RT_TAKEOVER</c> to indicate what was actually done.
@@ -832,123 +958,151 @@ typedef enum {
       <c>reload</c> or <c>upgrade</c>.</p>
       <p>Was previously named <c>enif_get_data</c>.</p></desc>
     </func>
-    <func><name><ret>void</ret><nametext>enif_realloc_binary(ErlNifEnv* env, ErlNifBinary* bin, unsigned size)</nametext></name>
+    <func><name><ret>void</ret><nametext>enif_realloc_binary(ErlNifBinary* bin, size_t size)</nametext></name>
       <fsummary>Change the size of a binary.</fsummary>
       <desc><p>Change the size of a binary <c>bin</c>. The source binary
       may be read-only, in which case it will be left untouched and
       a mutable copy is allocated and assigned to <c>*bin</c>.</p></desc>
     </func>
-    <func><name><ret>void</ret><nametext>enif_release_binary(ErlNifEnv* env, ErlNifBinary* bin)</nametext></name>
+    <func><name><ret>void</ret><nametext>enif_release_binary(ErlNifBinary* bin)</nametext></name>
       <fsummary>Release a binary.</fsummary>
-      <desc><p>Release a binary obtained 
-              from <c>enif_alloc_binary</c>.</p></desc>
+      <desc><p>Release a binary obtained from <c>enif_alloc_binary</c>.</p></desc>
     </func>
-    <func><name><ret>void</ret><nametext>enif_release_resource(ErlNifEnv* env, void* obj)</nametext></name>
+    <func><name><ret>void</ret><nametext>enif_release_resource(void* obj)</nametext></name>
       <fsummary>Release a resource object.</fsummary>
-      <desc><p>Release a resource object obtained from <c>enif_alloc_resource</c>.
-      The object may still be alive if it is referred to by Erlang terms. Each call to
-      <c>enif_release_resource</c> must correspond to a previous call to <c>enif_alloc_resource</c>.
-      References made by <c>enif_make_resource</c> can only be released by the garbage collector.</p></desc>
+      <desc><p>Remove a reference to resource object <c>obj</c>obtained from
+      <seealso marker="#enif_alloc_resource">enif_alloc_resource</seealso>.
+      The resource object will be destructed when the last reference is removed.
+      Each call to <c>enif_release_resource</c> must correspond to a previous
+      call to <c>enif_alloc_resource</c> or
+      <seealso marker="#enif_keep_resource">enif_keep_resource</seealso>.
+      References made by <seealso marker="#enif_make_resource">enif_make_resource</seealso>
+      can only be removed by the garbage collector.</p></desc>
     </func>
     <func><name><ret>ErlNifRWLock*</ret><nametext>enif_rwlock_create(char *name)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_rwlock_create">erl_drv_rwlock_create()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_rwlock_create">erl_drv_rwlock_create</seealso>.
           </p></desc>
     </func>
     <func><name><ret>void</ret><nametext>enif_rwlock_destroy(ErlNifRWLock *rwlck)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_rwlock_destroy">erl_drv_rwlock_destroy()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_rwlock_destroy">erl_drv_rwlock_destroy</seealso>.
           </p></desc>
     </func>
     <func><name><ret>void</ret><nametext>enif_rwlock_rlock(ErlNifRWLock *rwlck)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_rwlock_rlock">erl_drv_rwlock_rlock()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_rwlock_rlock">erl_drv_rwlock_rlock</seealso>.
           </p></desc>
     </func>
     <func><name><ret>void</ret><nametext>enif_rwlock_runlock(ErlNifRWLock *rwlck)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_rwlock_runlock">erl_drv_rwlock_runlock()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_rwlock_runlock">erl_drv_rwlock_runlock</seealso>.
           </p></desc>
     </func>
     <func><name><ret>void</ret><nametext>enif_rwlock_rwlock(ErlNifRWLock *rwlck)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_rwlock_rwlock">erl_drv_rwlock_rwlock()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_rwlock_rwlock">erl_drv_rwlock_rwlock</seealso>.
           </p></desc>
     </func>
     <func><name><ret>void</ret><nametext>enif_rwlock_rwunlock(ErlNifRWLock *rwlck)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_rwlock_rwunlock">erl_drv_rwlock_rwunlock()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_rwlock_rwunlock">erl_drv_rwlock_rwunlock</seealso>.
           </p></desc>
     </func>
     <func><name><ret>int</ret><nametext>enif_rwlock_tryrlock(ErlNifRWLock *rwlck)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_rwlock_tryrlock">erl_drv_rwlock_tryrlock()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_rwlock_tryrlock">erl_drv_rwlock_tryrlock</seealso>.
           </p></desc>
     </func>
     <func><name><ret>int</ret><nametext>enif_rwlock_tryrwlock(ErlNifRWLock *rwlck)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_rwlock_tryrwlock">erl_drv_rwlock_tryrwlock()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_rwlock_tryrwlock">erl_drv_rwlock_tryrwlock</seealso>.
           </p></desc>
     </func>
-    <func><name><ret>unsigned</ret><nametext>enif_sizeof_resource(ErlNifEnv* env, void* obj)</nametext></name>
+    <func><name><ret>unsigned</ret><nametext>enif_send(ErlNifEnv* env, ErlNifPid* to_pid, ErlNifEnv* msg_env, ERL_NIF_TERM msg)</nametext></name>
+      <fsummary>Send a message to a process.</fsummary>
+      <desc><p>Send a message to a process.</p>
+      <taglist>
+        <tag><c>env</c></tag>
+              <item>The environment of the calling process. Must be NULL if and
+              only if calling from a created thread.</item>
+        <tag><c>*to_pid</c></tag>
+              <item>The pid of the receiving process. The pid should refer to a process on the local node.</item>
+        <tag><c>msg_env</c></tag>
+              <item>The environment of the message term. Must be a process
+              independent environment allocated with
+               <seealso marker="#enif_alloc_env">enif_alloc_env</seealso>.</item>
+        <tag><c>msg</c></tag>
+              <item>The message term to send.</item>
+      </taglist>
+      <p>Return true on success, or false if <c>*to_pid</c> does not refer to an alive local process.</p>
+      <p>The message environment <c>msg_env</c> with all its terms (including
+      <c>msg</c>) will be invalidated by a successful call to <c>enif_send</c>. The environment
+      should either be freed with <seealso marker="#enif_free_env">enif_free_env</seealso>
+      of cleared for reuse with <seealso marker="#enif_clear_env">enif_clear_env</seealso>.</p>
+      <p>This function is only thread-safe when the emulator with SMP support is used.
+      It can only be used in a non-SMP emulator from a NIF-calling thread.</p>
+      </desc>
+    </func>
+    <func><name><ret>unsigned</ret><nametext>enif_sizeof_resource(void* obj)</nametext></name>
       <fsummary>Get the byte size of a resource object</fsummary>
       <desc><p>Get the byte size of a resource object <c>obj</c> obtained by
-      <c>enif_alloc_resource</c>.</p></desc>
+      <seealso marker="#enif_alloc_resource">enif_alloc_resource</seealso>.</p></desc>
     </func>
     <func>
       <name><ret>void</ret><nametext>enif_system_info(ErlNifSysInfo *sys_info_ptr, size_t size)</nametext></name>
       <fsummary>Get information about the Erlang runtime system</fsummary>
-      <desc><p>Same as <seealso marker="erl_driver#driver_system_info">driver_system_info()</seealso>.
+      <desc><p>Same as <seealso marker="erl_driver#driver_system_info">driver_system_info</seealso>.
             </p></desc>
     </func>
     <func><name><ret>int</ret><nametext>enif_thread_create(char *name,ErlNifTid *tid,void * (*func)(void *),void *args,ErlNifThreadOpts *opts)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_thread_create">erl_drv_thread_create()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_thread_create">erl_drv_thread_create</seealso>.
           </p></desc>
     </func>
     <func><name><ret>void</ret><nametext>enif_thread_exit(void *resp)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_thread_exit">erl_drv_thread_exit()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_thread_exit">erl_drv_thread_exit</seealso>.
           </p></desc>
     </func>
     <func><name><ret>int</ret><nametext>enif_thread_join(ErlNifTid, void **respp)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_thread_join">erl_drv_thread_join ()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_thread_join">erl_drv_thread_join </seealso>.
           </p></desc>
     </func>
     <func><name><ret>ErlNifThreadOpts*</ret><nametext>enif_thread_opts_create(char *name)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_thread_opts_create">erl_drv_thread_opts_create()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_thread_opts_create">erl_drv_thread_opts_create</seealso>.
           </p></desc>
     </func>
     <func><name><ret>void</ret><nametext>enif_thread_opts_destroy(ErlNifThreadOpts *opts)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_thread_opts_destroy">erl_drv_thread_opts_destroy()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_thread_opts_destroy">erl_drv_thread_opts_destroy</seealso>.
           </p></desc>
     </func>
     <func><name><ret>ErlNifTid</ret><nametext>enif_thread_self(void)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_thread_self">erl_drv_thread_self()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_thread_self">erl_drv_thread_self</seealso>.
           </p></desc>
     </func>
     <func><name><ret>int</ret><nametext>enif_tsd_key_create(char *name, ErlNifTSDKey *key)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_tsd_key_create">erl_drv_tsd_key_create()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_tsd_key_create">erl_drv_tsd_key_create</seealso>.
           </p></desc>
     </func>
     <func><name><ret>void</ret><nametext>enif_tsd_key_destroy(ErlNifTSDKey key)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_tsd_key_destroy">erl_drv_tsd_key_destroy()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_tsd_key_destroy">erl_drv_tsd_key_destroy</seealso>.
           </p></desc>
     </func>
     <func><name><ret>void*</ret><nametext>enif_tsd_get(ErlNifTSDKey key)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_tsd_get">erl_drv_tsd_get()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_tsd_get">erl_drv_tsd_get</seealso>.
           </p></desc>
     </func>
     <func><name><ret>void</ret><nametext>enif_tsd_set(ErlNifTSDKey key, void *data)</nametext></name>
     <fsummary></fsummary>
-    <desc><p>Same as <seealso marker="erl_driver#erl_drv_tsd_set">erl_drv_tsd_set()</seealso>.
+    <desc><p>Same as <seealso marker="erl_driver#erl_drv_tsd_set">erl_drv_tsd_set</seealso>.
           </p></desc>
     </func>
   </funcs>
diff --git a/erts/emulator/beam/break.c b/erts/emulator/beam/break.c
index 5cb1481a3a..857cb177c8 100644
--- a/erts/emulator/beam/break.c
+++ b/erts/emulator/beam/break.c
@@ -258,12 +258,10 @@ print_process_info(int to, void *to_arg, Process *p)
     }
 
     {
-       long s = 0;
        int frags = 0;
        ErlHeapFragment *m = p->mbuf;
        while (m != NULL) {
 	   frags++;
-	   s += m->size;
 	   m = m->next;
        }
        erts_print(to, to_arg, "Number of heap fragments: %d\n", frags);
diff --git a/erts/emulator/beam/copy.c b/erts/emulator/beam/copy.c
index 0a5050b1fe..521a1b1788 100644
--- a/erts/emulator/beam/copy.c
+++ b/erts/emulator/beam/copy.c
@@ -1,19 +1,19 @@
 /*
  * %CopyrightBegin%
- * 
- * Copyright Ericsson AB 1996-2009. All Rights Reserved.
- * 
+ *
+ * Copyright Ericsson AB 1996-2010. All Rights Reserved.
+ *
  * The contents of this file are subject to the Erlang Public License,
  * Version 1.1, (the "License"); you may not use this file except in
  * compliance with the License. You should have received a copy of the
  * Erlang Public License along with this software. If not, it can be
  * retrieved online at http://www.erlang.org/.
- * 
+ *
  * Software distributed under the License is distributed on an "AS IS"
  * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
  * the License for the specific language governing rights and limitations
  * under the License.
- * 
+ *
  * %CopyrightEnd%
  */
 
@@ -37,6 +37,8 @@ MA_STACK_DECLARE(dst);
 MA_STACK_DECLARE(offset);
 #endif
 
+static void move_one_frag(Eterm** hpp, Eterm* src, Uint src_sz, ErlOffHeap*);
+
 void
 init_copy(void)
 {
@@ -86,7 +88,7 @@ size_object(Eterm obj)
 	    obj = *ptr++;
 	    if (!IS_CONST(obj)) {
 		ESTACK_PUSH(s, obj);
-	    }
+	    }	    
 	    obj = *ptr;
 	    break;
 	case TAG_PRIMARY_BOXED:
@@ -99,7 +101,7 @@ size_object(Eterm obj)
 		    arity = header_arity(hdr);
 		    sum += arity + 1;
 		    if (arity == 0) { /* Empty tuple -- unusual. */
-			goto size_common;
+			goto pop_next;
 		    }
 		    while (arity-- > 1) {
 			obj = *++ptr;
@@ -115,7 +117,6 @@ size_object(Eterm obj)
 			ErlFunThing* funp = (ErlFunThing *) bptr;
 			unsigned eterms = 1 /* creator */ + funp->num_free;
 			unsigned sz = thing_arityval(hdr);
-
 			sum += 1 /* header */ + sz + eterms;
 			bptr += 1 /* header */ + sz;
 			while (eterms-- > 1) {
@@ -151,7 +152,7 @@ size_object(Eterm obj)
 			} else {
 			    sum += heap_bin_size(binary_size(obj)+extra_bytes);
 			}
-			goto size_common;
+			goto pop_next;
 		    }
 		    break;
 		case BIN_MATCHSTATE_SUBTAG:
@@ -159,18 +160,12 @@ size_object(Eterm obj)
 			     "size_object: matchstate term not allowed");
 		default:
 		    sum += thing_arityval(hdr) + 1;
-		    /* Fall through */
-		size_common:
-		    if (ESTACK_ISEMPTY(s)) {
-			DESTROY_ESTACK(s);
-			return sum;
-		    }
-		    obj = ESTACK_POP(s);
-		    break;
+		    goto pop_next;
 		}
 	    }
 	    break;
 	case TAG_PRIMARY_IMMED1:
+	pop_next:
 	    if (ESTACK_ISEMPTY(s)) {
 		DESTROY_ESTACK(s);
 		return sum;
@@ -979,3 +974,104 @@ copy_shallow(Eterm* ptr, Uint sz, Eterm** hpp, ErlOffHeap* off_heap)
     *hpp = hp;
     return make_tuple(ptr + offs); 
 }
+
+/* Move all terms in heap fragments into heap. The terms must be guaranteed to 
+ * be contained within the fragments. The source terms are destructed with
+ * move markers.
+ * Typically used to copy a multi-fragmented message (from NIF).
+ */
+void move_multi_frags(Eterm** hpp, ErlOffHeap* off_heap, ErlHeapFragment* first,
+		      Eterm* refs, unsigned nrefs)
+{
+    ErlHeapFragment* bp;
+    Eterm* hp_start = *hpp;
+    Eterm* hp_end;
+    Eterm* hp;
+    unsigned i;
+
+    for (bp=first; bp!=NULL; bp=bp->next) {
+	move_one_frag(hpp, bp->mem, bp->used_size, off_heap);
+	off_heap->overhead += bp->off_heap.overhead;
+    }
+    hp_end = *hpp;
+    for (hp=hp_start; hp<hp_end; ++hp) {
+	Eterm* ptr;
+	Eterm val;
+	Eterm gval = *hp;
+	switch (primary_tag(gval)) {
+	case TAG_PRIMARY_BOXED:
+	    ptr = boxed_val(gval);
+	    val = *ptr;
+	    if (IS_MOVED_BOXED(val)) {
+		ASSERT(is_boxed(val));
+		*hp = val;
+	    }
+	    break;
+	case TAG_PRIMARY_LIST:
+	    ptr = list_val(gval);
+	    val = *ptr;
+	    if (IS_MOVED_CONS(val)) {
+		*hp = ptr[1];
+	    }
+	    break;
+	case TAG_PRIMARY_HEADER:
+	    if (header_is_thing(gval)) {
+		hp += thing_arityval(gval);
+	    }
+	    break;
+	}
+    }
+    for (i=0; i<nrefs; ++i) {
+	refs[i] = follow_moved(refs[i]);
+    }
+}
+
+static void
+move_one_frag(Eterm** hpp, Eterm* src, Uint src_sz, ErlOffHeap* off_heap)
+{
+    union {
+	Uint *up;
+	ProcBin *pbp;
+	ErlFunThing *efp;
+	ExternalThing *etp;
+    } ohe;
+    Eterm* ptr = src;
+    Eterm* end = ptr + src_sz;
+    Eterm dummy_ref;
+    Eterm* hp = *hpp;
+
+    while (ptr != end) {
+	Eterm val;
+	ASSERT(ptr < end);
+	val = *ptr;
+	ASSERT(val != ERTS_HOLE_MARKER);
+	if (is_header(val)) {
+	    ASSERT(ptr + header_arity(val) < end);
+	    ohe.up = hp;
+	    MOVE_BOXED(ptr, val, hp, &dummy_ref);	    
+	    switch (val & _HEADER_SUBTAG_MASK) {
+	    case REFC_BINARY_SUBTAG:
+		ohe.pbp->next = off_heap->mso;
+		off_heap->mso = ohe.pbp;
+		break;
+	    case FUN_SUBTAG:
+		ohe.efp->next = off_heap->funs;
+		off_heap->funs = ohe.efp;
+		break;
+	    case EXTERNAL_PID_SUBTAG:
+	    case EXTERNAL_PORT_SUBTAG:
+	    case EXTERNAL_REF_SUBTAG:
+		ohe.etp->next = off_heap->externals;
+		off_heap->externals = ohe.etp;
+		break;
+	    }
+	}
+	else { /* must be a cons cell */
+	    ASSERT(ptr+1 < end);
+	    MOVE_CONS(ptr, val, hp, &dummy_ref);
+	    ptr += 2;
+	}
+    }
+    *hpp = hp;
+}
+
diff --git a/erts/emulator/beam/erl_bif_info.c b/erts/emulator/beam/erl_bif_info.c
index de60ca49fa..70d0e91a2c 100644
--- a/erts/emulator/beam/erl_bif_info.c
+++ b/erts/emulator/beam/erl_bif_info.c
@@ -1140,9 +1140,9 @@ process_info_aux(Process *BIF_P,
 			}
 			else {
 			    /* Make our copy of the message */
-			    ASSERT(size_object(msg) == hfp->size);
+			    ASSERT(size_object(msg) == hfp->used_size);
 			    msg = copy_struct(msg,
-					      hfp->size,
+					      hfp->used_size,
 					      &hp,
 					      &MSO(BIF_P));
 			}
@@ -2715,7 +2715,7 @@ BIF_RETTYPE port_info_2(BIF_ALIST_2)
 	erts_doforall_links(prt->nlinks, &one_link_size, &size);
 
 	for (bp = prt->bp; bp; bp = bp->next)
-	    size += sizeof(ErlHeapFragment) + (bp->size - 1)*sizeof(Eterm);
+	    size += sizeof(ErlHeapFragment) + (bp->alloc_size - 1)*sizeof(Eterm);
 
 	if (prt->linebuf)
 	    size += sizeof(LineBuf) + prt->linebuf->ovsiz;
diff --git a/erts/emulator/beam/erl_bif_port.c b/erts/emulator/beam/erl_bif_port.c
index 9b56ddd4f8..378c5e73fd 100644
--- a/erts/emulator/beam/erl_bif_port.c
+++ b/erts/emulator/beam/erl_bif_port.c
@@ -579,8 +579,8 @@ BIF_RETTYPE port_get_data_1(BIF_ALIST_1)
     if (prt->bp == NULL) {	/* MUST be CONST! */
 	res = prt->data;
     } else {
-	Eterm* hp = HAlloc(BIF_P, prt->bp->size);
-	res = copy_struct(prt->data, prt->bp->size, &hp, &MSO(BIF_P));
+	Eterm* hp = HAlloc(BIF_P, prt->bp->used_size);
+	res = copy_struct(prt->data, prt->bp->used_size, &hp, &MSO(BIF_P));
     }
     erts_smp_port_unlock(prt);
     BIF_RET(res);
diff --git a/erts/emulator/beam/erl_bif_timer.c b/erts/emulator/beam/erl_bif_timer.c
index eb40c75110..4ae2f6ebf4 100644
--- a/erts/emulator/beam/erl_bif_timer.c
+++ b/erts/emulator/beam/erl_bif_timer.c
@@ -357,7 +357,7 @@ bif_timer_timeout(ErtsBifTimer* btm)
 						 rp,
 						 &rp_locks);
 		} else {
-		    Eterm old_size = bp->size;
+		    Eterm old_size = bp->used_size;
 		    bp = erts_resize_message_buffer(bp, old_size + wrap_size,
 						    &message, 1);
 		    hp = &bp->mem[0] + old_size;
diff --git a/erts/emulator/beam/erl_db_util.c b/erts/emulator/beam/erl_db_util.c
index fd7de98ac9..93a47eb76f 100644
--- a/erts/emulator/beam/erl_db_util.c
+++ b/erts/emulator/beam/erl_db_util.c
@@ -1547,10 +1547,9 @@ restart:
      */  
     context.save = NULL;
 error: /* Here is were we land when compilation failed. */
-    while (context.save != NULL) {
-	ErlHeapFragment *ll = context.save->next;
+    if (context.save != NULL) {
 	free_message_buffer(context.save);
-	context.save = ll;
+	context.save = NULL;
     }
     DMC_FREE(stack);
     DMC_FREE(text);
@@ -1567,15 +1566,11 @@ error: /* Here is were we land when compilation failed. */
 void erts_db_match_prog_destructor(Binary *bprog)
 {
     MatchProg *prog;
-    ErlHeapFragment *tmp, *ll;
     if (bprog == NULL)
 	return;
     prog = Binary2MatchProg(bprog);
-    tmp = prog->term_save; 
-    while (tmp != NULL) {
-	ll = tmp->next;
-	free_message_buffer(tmp);
-	tmp = ll;
+    if (prog->term_save != NULL) {
+	free_message_buffer(prog->term_save); 
     }
     if (prog->saved_program_buf != NULL)
 	free_message_buffer(prog->saved_program_buf);
@@ -4125,7 +4120,7 @@ static int match_compact(ErlHeapFragment *expr, DMCErrInfo *err_info)
     DMC_INIT_STACK(heap);
 
     p = expr->mem;
-    i = expr->size;
+    i = expr->used_size;
     while (i--) {
 	if (is_thing(*p)) {
 	    a = thing_arityval(*p);
@@ -4154,7 +4149,7 @@ static int match_compact(ErlHeapFragment *expr, DMCErrInfo *err_info)
     }
 
     p = expr->mem;
-    i = expr->size;
+    i = expr->used_size;
     while (i--) {
 	if (is_thing(*p)) {
 	    a = thing_arityval(*p);
diff --git a/erts/emulator/beam/erl_debug.c b/erts/emulator/beam/erl_debug.c
index 58d3f92f56..d7d6fcf0a2 100644
--- a/erts/emulator/beam/erl_debug.c
+++ b/erts/emulator/beam/erl_debug.c
@@ -261,7 +261,7 @@ static int verify_eterm(Process *p,Eterm element)
             return 1;
 
         for (mbuf = p->mbuf; mbuf; mbuf = mbuf->next) {
-            if (WITHIN(ptr, &mbuf->mem[0], &mbuf->mem[0] + mbuf->size)) {
+            if (WITHIN(ptr, &mbuf->mem[0], &mbuf->mem[0] + mbuf->used_size)) {
                 return 1;
             }
         }
@@ -308,7 +308,7 @@ void erts_check_stack(Process *p)
 	if (IN_HEAP(p, ptr))
 	    continue;
 	for (mbuf = p->mbuf; mbuf; mbuf = mbuf->next)
-	    if (WITHIN(ptr, &mbuf->mem[0], &mbuf->mem[0] + mbuf->size)) {
+	    if (WITHIN(ptr, &mbuf->mem[0], &mbuf->mem[0] + mbuf->used_size)) {
 		in_mbuf = 1;
 		break;
 	    }
@@ -746,7 +746,7 @@ static void print_process_memory(Process *p)
                     PTR_SIZE, "heap fragments",
                     dashes, dashes, dashes, dashes);
     while (bp) {
-	print_untagged_memory(bp->mem,bp->mem + bp->size);
+	print_untagged_memory(bp->mem,bp->mem + bp->used_size);
         bp = bp->next;
     }
 }
diff --git a/erts/emulator/beam/erl_gc.c b/erts/emulator/beam/erl_gc.c
index 9ed566e66e..a19e090f1e 100644
--- a/erts/emulator/beam/erl_gc.c
+++ b/erts/emulator/beam/erl_gc.c
@@ -667,7 +667,7 @@ erts_garbage_collect_literals(Process* p, Eterm* literals, Uint lit_size)
 	    case TAG_PRIMARY_BOXED:
 		ptr = boxed_val(gval);
 		val = *ptr;
-                if (IS_MOVED(val)) {
+                if (IS_MOVED_BOXED(val)) {
 		    ASSERT(is_boxed(val));
                     *g_ptr++ = val;
 		} else if (in_area(ptr, area, area_size)) {
@@ -679,7 +679,7 @@ erts_garbage_collect_literals(Process* p, Eterm* literals, Uint lit_size)
 	    case TAG_PRIMARY_LIST:
                 ptr = list_val(gval);
                 val = *ptr;
-                if (is_non_value(val)) { /* Moved */
+                if (IS_MOVED_CONS(val)) { /* Moved */
                     *g_ptr++ = ptr[1];
 		} else if (in_area(ptr, area, area_size)) {
                     MOVE_CONS(ptr,val,old_htop,g_ptr++);
@@ -913,7 +913,7 @@ do_minor(Process *p, int new_sz, Eterm* objv, int nobj)
 	    case TAG_PRIMARY_BOXED: {
 		ptr = boxed_val(gval);
                 val = *ptr;
-                if (IS_MOVED(val)) {
+                if (IS_MOVED_BOXED(val)) {
 		    ASSERT(is_boxed(val));
                     *g_ptr++ = val;
                 } else if (in_area(ptr, heap, mature_size)) {
@@ -929,7 +929,7 @@ do_minor(Process *p, int new_sz, Eterm* objv, int nobj)
 	    case TAG_PRIMARY_LIST: {
                 ptr = list_val(gval);
                 val = *ptr;
-                if (is_non_value(val)) { /* Moved */
+                if (IS_MOVED_CONS(val)) { /* Moved */
                     *g_ptr++ = ptr[1];
                 } else if (in_area(ptr, heap, mature_size)) {
                     MOVE_CONS(ptr,val,old_htop,g_ptr++);
@@ -972,7 +972,7 @@ do_minor(Process *p, int new_sz, Eterm* objv, int nobj)
 	    case TAG_PRIMARY_BOXED: {
 		ptr = boxed_val(gval);
 		val = *ptr;
-		if (IS_MOVED(val)) {
+		if (IS_MOVED_BOXED(val)) {
 		    ASSERT(is_boxed(val));
 		    *n_hp++ = val;
 		} else if (in_area(ptr, heap, mature_size)) {
@@ -987,7 +987,7 @@ do_minor(Process *p, int new_sz, Eterm* objv, int nobj)
 	    case TAG_PRIMARY_LIST: {
 		ptr = list_val(gval);
 		val = *ptr;
-		if (is_non_value(val)) {
+		if (IS_MOVED_CONS(val)) {
 		    *n_hp++ = ptr[1];
 		} else if (in_area(ptr, heap, mature_size)) {
 		    MOVE_CONS(ptr,val,old_htop,n_hp++);
@@ -1008,7 +1008,7 @@ do_minor(Process *p, int new_sz, Eterm* objv, int nobj)
 			Eterm* origptr = &(mb->orig);
 			ptr = boxed_val(*origptr);
 			val = *ptr;
-			if (IS_MOVED(val)) {
+			if (IS_MOVED_BOXED(val)) {
 			    *origptr = val;
 			    mb->base = binary_bytes(val);
 			} else if (in_area(ptr, heap, mature_size)) {
@@ -1161,7 +1161,7 @@ major_collection(Process* p, int need, Eterm* objv, int nobj, Uint *recl)
 	    case TAG_PRIMARY_BOXED: {
 		ptr = boxed_val(gval);
 		val = *ptr;
-		if (IS_MOVED(val)) {
+		if (IS_MOVED_BOXED(val)) {
 		    ASSERT(is_boxed(val));
 		    *g_ptr++ = val;
 		} else if (in_area(ptr, src, src_size) || in_area(ptr, oh, oh_size)) {
@@ -1175,7 +1175,7 @@ major_collection(Process* p, int need, Eterm* objv, int nobj, Uint *recl)
 	    case TAG_PRIMARY_LIST: {
 		ptr = list_val(gval);
 		val = *ptr;
-		if (is_non_value(val)) {
+		if (IS_MOVED_CONS(val)) {
 		    *g_ptr++ = ptr[1];
 		} else if (in_area(ptr, src, src_size) || in_area(ptr, oh, oh_size)) {
 		    MOVE_CONS(ptr,val,n_htop,g_ptr++);
@@ -1216,7 +1216,7 @@ major_collection(Process* p, int need, Eterm* objv, int nobj, Uint *recl)
 	    case TAG_PRIMARY_BOXED: {
 		ptr = boxed_val(gval);
 		val = *ptr;
-		if (IS_MOVED(val)) {
+		if (IS_MOVED_BOXED(val)) {
 		    ASSERT(is_boxed(val));
 		    *n_hp++ = val;
 		} else if (in_area(ptr, src, src_size) || in_area(ptr, oh, oh_size)) {
@@ -1229,7 +1229,7 @@ major_collection(Process* p, int need, Eterm* objv, int nobj, Uint *recl)
 	    case TAG_PRIMARY_LIST: {
 		ptr = list_val(gval);
 		val = *ptr;
-		if (is_non_value(val)) {
+		if (IS_MOVED_CONS(val)) {
 		    *n_hp++ = ptr[1];
 		} else if (in_area(ptr, src, src_size) || in_area(ptr, oh, oh_size)) {
 		    MOVE_CONS(ptr,val,n_htop,n_hp++);
@@ -1249,7 +1249,7 @@ major_collection(Process* p, int need, Eterm* objv, int nobj, Uint *recl)
 			origptr = &(mb->orig);
 			ptr = boxed_val(*origptr);
 			val = *ptr;
-			if (IS_MOVED(val)) {
+			if (IS_MOVED_BOXED(val)) {
 			    *origptr = val;
 			    mb->base = binary_bytes(*origptr);
 			} else if (in_area(ptr, src, src_size) ||
@@ -1392,17 +1392,12 @@ combined_message_size(Process* p)
 static void
 remove_message_buffers(Process* p)
 {
-    ErlHeapFragment* bp = MBUF(p);
-
-    MBUF(p) = NULL;
-    MBUF_SIZE(p) = 0;
-    while (bp != NULL) {
-	ErlHeapFragment* next_bp = bp->next;
-	free_message_buffer(bp);
-	bp = next_bp;
-    }
+    if (MBUF(p) != NULL) {
+	free_message_buffer(MBUF(p));
+	MBUF(p) = NULL;
+    }    
+    MBUF_SIZE(p) = 0;    
 }
-
 #ifdef HARDDEBUG
 
 /*
@@ -1433,12 +1428,12 @@ disallow_heap_frag_ref(Process* p, Eterm* n_htop, Eterm* objv, int nobj)
 	case TAG_PRIMARY_BOXED: {
 	    ptr = _unchecked_boxed_val(gval);
 	    val = *ptr;
-	    if (IS_MOVED(val)) {
+	    if (IS_MOVED_BOXED(val)) {
 		ASSERT(is_boxed(val));
 		objv++;
 	    } else {
  		for (qb = mbuf; qb != NULL; qb = qb->next) {
-		    if (in_area(ptr, qb->mem, qb->size*sizeof(Eterm))) {
+		    if (in_area(ptr, qb->mem, qb->alloc_size*sizeof(Eterm))) {
 			abort();
 		    }
 		}
@@ -1450,11 +1445,11 @@ disallow_heap_frag_ref(Process* p, Eterm* n_htop, Eterm* objv, int nobj)
 	case TAG_PRIMARY_LIST: {
 	    ptr = _unchecked_list_val(gval);
 	    val = *ptr;
-	    if (is_non_value(val)) {
+	    if (IS_MOVED_CONS(val)) {
 		objv++;
 	    } else {
 		for (qb = mbuf; qb != NULL; qb = qb->next) {
-		    if (in_area(ptr, qb->mem, qb->size*sizeof(Eterm))) {
+		    if (in_area(ptr, qb->mem, qb->alloc_size*sizeof(Eterm))) {
 			abort();
 		    }
 		}
@@ -1499,7 +1494,7 @@ disallow_heap_frag_ref_in_heap(Process* p)
 	    ptr = _unchecked_boxed_val(val);
 	    if (!in_area(ptr, heap, heap_size)) {
 		for (qb = MBUF(p); qb != NULL; qb = qb->next) {
-		    if (in_area(ptr, qb->mem, qb->size*sizeof(Eterm))) {
+		    if (in_area(ptr, qb->mem, qb->alloc_size*sizeof(Eterm))) {
 			abort();
 		    }
 		}
@@ -1509,7 +1504,7 @@ disallow_heap_frag_ref_in_heap(Process* p)
 	    ptr = _unchecked_list_val(val);
 	    if (!in_area(ptr, heap, heap_size)) {
 		for (qb = MBUF(p); qb != NULL; qb = qb->next) {
-		    if (in_area(ptr, qb->mem, qb->size*sizeof(Eterm))) {
+		    if (in_area(ptr, qb->mem, qb->alloc_size*sizeof(Eterm))) {
 			abort();
 		    }
 		}
@@ -1557,7 +1552,7 @@ disallow_heap_frag_ref_in_old_heap(Process* p)
 		    abort();
 		}
 		for (qb = MBUF(p); qb != NULL; qb = qb->next) {
-		    if (in_area(ptr, qb->mem, qb->size*sizeof(Eterm))) {
+		    if (in_area(ptr, qb->mem, qb->alloc_size*sizeof(Eterm))) {
 			abort();
 		    }
 		}
@@ -1570,7 +1565,7 @@ disallow_heap_frag_ref_in_old_heap(Process* p)
 		    abort();
 		}
 		for (qb = MBUF(p); qb != NULL; qb = qb->next) {
-		    if (in_area(ptr, qb->mem, qb->size*sizeof(Eterm))) {
+		    if (in_area(ptr, qb->mem, qb->alloc_size*sizeof(Eterm))) {
 			abort();
 		    }
 		}
@@ -1610,7 +1605,7 @@ sweep_rootset(Rootset* rootset, Eterm* htop, char* src, Uint src_size)
 	    case TAG_PRIMARY_BOXED: {
 		ptr = boxed_val(gval);
                 val = *ptr;
-                if (IS_MOVED(val)) {
+                if (IS_MOVED_BOXED(val)) {
 		    ASSERT(is_boxed(val));
                     *g_ptr++ = val;
                 } else if (in_area(ptr, src, src_size)) {
@@ -1623,7 +1618,7 @@ sweep_rootset(Rootset* rootset, Eterm* htop, char* src, Uint src_size)
 	    case TAG_PRIMARY_LIST: {
                 ptr = list_val(gval);
                 val = *ptr;
-                if (is_non_value(val)) { /* Moved */
+                if (IS_MOVED_CONS(val)) {
                     *g_ptr++ = ptr[1];
                 } else if (in_area(ptr, src, src_size)) {
                     MOVE_CONS(ptr,val,htop,g_ptr++);
@@ -1657,7 +1652,7 @@ sweep_one_area(Eterm* n_hp, Eterm* n_htop, char* src, Uint src_size)
 	case TAG_PRIMARY_BOXED: {
 	    ptr = boxed_val(gval);
 	    val = *ptr;
-	    if (IS_MOVED(val)) {
+	    if (IS_MOVED_BOXED(val)) {
 		ASSERT(is_boxed(val));
 		*n_hp++ = val;
 	    } else if (in_area(ptr, src, src_size)) {
@@ -1670,7 +1665,7 @@ sweep_one_area(Eterm* n_hp, Eterm* n_htop, char* src, Uint src_size)
 	case TAG_PRIMARY_LIST: {
 	    ptr = list_val(gval);
 	    val = *ptr;
-	    if (is_non_value(val)) {
+	    if (IS_MOVED_CONS(val)) {
 		*n_hp++ = ptr[1];
 	    } else if (in_area(ptr, src, src_size)) {
 		MOVE_CONS(ptr,val,n_htop,n_hp++);
@@ -1690,7 +1685,7 @@ sweep_one_area(Eterm* n_hp, Eterm* n_htop, char* src, Uint src_size)
 		    origptr = &(mb->orig);
 		    ptr = boxed_val(*origptr);
 		    val = *ptr;
-		    if (IS_MOVED(val)) {
+		    if (IS_MOVED_BOXED(val)) {
 			*origptr = val;
 			mb->base = binary_bytes(*origptr);
 		    } else if (in_area(ptr, src, src_size)) {
@@ -1722,7 +1717,7 @@ sweep_one_heap(Eterm* heap_ptr, Eterm* heap_end, Eterm* htop, char* src, Uint sr
 	case TAG_PRIMARY_BOXED: {
 	    ptr = boxed_val(gval);
 	    val = *ptr;
-	    if (IS_MOVED(val)) {
+	    if (IS_MOVED_BOXED(val)) {
 		ASSERT(is_boxed(val));
 		*heap_ptr++ = val;
 	    } else if (in_area(ptr, src, src_size)) {
@@ -1735,7 +1730,7 @@ sweep_one_heap(Eterm* heap_ptr, Eterm* heap_end, Eterm* htop, char* src, Uint sr
 	case TAG_PRIMARY_LIST: {
 	    ptr = list_val(gval);
 	    val = *ptr;
-	    if (is_non_value(val)) {
+	    if (IS_MOVED_CONS(val)) {
 		*heap_ptr++ = ptr[1];
 	    } else if (in_area(ptr, src, src_size)) {
 		MOVE_CONS(ptr,val,htop,heap_ptr++);
@@ -1830,28 +1825,6 @@ collect_heap_frags(Process* p, Eterm* n_hstart, Eterm* n_htop,
     return n_htop;
 }
 
-#ifdef DEBUG
-static Eterm follow_moved(Eterm term)
-{
-    Eterm* ptr;
-    switch (primary_tag(term)) {
-    case TAG_PRIMARY_IMMED1:
-	break;
-    case TAG_PRIMARY_BOXED:
-	ptr = boxed_val(term);
-	if (IS_MOVED(*ptr)) term = *ptr;
-	break;
-    case TAG_PRIMARY_LIST:
-	ptr = list_val(term);
-	if (is_non_value(ptr[0])) term = ptr[1];
-	break;
-    default:
-	abort();
-    }
-    return term;
-}
-#endif
-
 static Uint
 setup_rootset(Process *p, Eterm *objv, int nobj, Rootset *rootset)
 {
@@ -2090,7 +2063,7 @@ sweep_proc_externals(Process *p, int fullsweep)
     while (ptr) {
         Eterm* ppt = (Eterm *) ptr;
 
-        if (IS_MOVED(*ppt)) {        /* Object is alive */
+        if (IS_MOVED_BOXED(*ppt)) {        /* Object is alive */
             ExternalThing* ro = external_thing_ptr(*ppt);
 
             *prev = ro;         /* Patch to moved pos */
@@ -2130,7 +2103,7 @@ sweep_proc_funs(Process *p, int fullsweep)
     while (ptr) {
         Eterm* ppt = (Eterm *) ptr;
 
-        if (IS_MOVED(*ppt)) {        /* Object is alive */
+        if (IS_MOVED_BOXED(*ppt)) {        /* Object is alive */
             ErlFunThing* ro = (ErlFunThing *) fun_val(*ppt);
 
             *prev = ro;         /* Patch to moved pos */
@@ -2244,7 +2217,7 @@ sweep_proc_bins(Process *p, int fullsweep)
     while (ptr) {
         Eterm* ppt = (Eterm *) ptr;
 
-        if (IS_MOVED(*ppt)) {        /* Object is alive */
+        if (IS_MOVED_BOXED(*ppt)) {        /* Object is alive */
 	    bin_vheap += ptr->size / sizeof(Eterm);
             ptr = (ProcBin*) binary_val(*ppt);		   
 	    link_live_proc_bin(&shrink,
@@ -2542,7 +2515,7 @@ within2(Eterm *ptr, Process *p, Eterm *real_htop)
         return 1;
     }
     while (bp != NULL) {
-        if (bp->mem <= ptr && ptr < bp->mem + bp->size) {
+        if (bp->mem <= ptr && ptr < bp->mem + bp->used_size) {
             return 1;
         }
         bp = bp->next;
@@ -2556,7 +2529,7 @@ within2(Eterm *ptr, Process *p, Eterm *real_htop)
 		hfp = erts_dist_ext_trailer(mp->data.dist_ext);
 	    else
 		hfp = NULL;
-	    if (hfp && hfp->mem <= ptr && ptr < hfp->mem + hfp->size)
+	    if (hfp && hfp->mem <= ptr && ptr < hfp->mem + hfp->used_size)
 		return 1;
 	}
         mp = mp->next;
diff --git a/erts/emulator/beam/erl_gc.h b/erts/emulator/beam/erl_gc.h
index af55b6363f..807ef8ae8d 100644
--- a/erts/emulator/beam/erl_gc.h
+++ b/erts/emulator/beam/erl_gc.h
@@ -1,19 +1,19 @@
 /*
  * %CopyrightBegin%
- * 
- * Copyright Ericsson AB 2007-2009. All Rights Reserved.
- * 
+ *
+ * Copyright Ericsson AB 2007-2010. All Rights Reserved.
+ *
  * The contents of this file are subject to the Erlang Public License,
  * Version 1.1, (the "License"); you may not use this file except in
  * compliance with the License. You should have received a copy of the
  * Erlang Public License along with this software. If not, it can be
  * retrieved online at http://www.erlang.org/.
- * 
+ *
  * Software distributed under the License is distributed on an "AS IS"
  * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
  * the License for the specific language governing rights and limitations
  * under the License.
- * 
+ *
  * %CopyrightEnd%
  */
 
@@ -22,11 +22,12 @@
 
 /* GC declarations shared by beam/erl_gc.c and hipe/hipe_gc.c */
 
-#ifdef DEBUG
+#if defined(DEBUG) && !ERTS_GLB_INLINE_INCL_FUNC_DEF
 #  define HARDDEBUG 1
 #endif
 
-#define IS_MOVED(x)	(!is_header((x)))
+#define IS_MOVED_BOXED(x)	(!is_header((x)))
+#define IS_MOVED_CONS(x)	(is_non_value((x)))
 
 #define MOVE_CONS(PTR,CAR,HTOP,ORIG)					\
 do {									\
@@ -69,4 +70,28 @@ extern Uint erts_test_long_gc_sleep;
 int within(Eterm *ptr, Process *p);
 #endif
 
+ERTS_GLB_INLINE Eterm follow_moved(Eterm term);
+
+#if ERTS_GLB_INLINE_INCL_FUNC_DEF
+ERTS_GLB_INLINE Eterm follow_moved(Eterm term)
+{
+    Eterm* ptr;
+    switch (primary_tag(term)) {
+    case TAG_PRIMARY_IMMED1:
+	break;
+    case TAG_PRIMARY_BOXED:
+	ptr = boxed_val(term);
+	if (IS_MOVED_BOXED(*ptr)) term = *ptr;
+	break;
+    case TAG_PRIMARY_LIST:
+	ptr = list_val(term);
+	if (IS_MOVED_CONS(ptr[0])) term = ptr[1];
+	break;
+    default:
+	ASSERT(!"strange tag in follow_moved");
+    }
+    return term;
+}
+#endif
+
 #endif /* __ERL_GC_H__ */
diff --git a/erts/emulator/beam/erl_message.c b/erts/emulator/beam/erl_message.c
index a056fce0c5..b63f3df7df 100644
--- a/erts/emulator/beam/erl_message.c
+++ b/erts/emulator/beam/erl_message.c
@@ -42,6 +42,15 @@ ERTS_SCHED_PREF_QUICK_ALLOC_IMPL(message,
 #undef HARD_DEBUG
 #endif
 
+
+
+
+static ERTS_INLINE int in_heapfrag(const Eterm* ptr, const ErlHeapFragment *bp)
+{
+    return ((unsigned)(ptr - bp->mem) < bp->used_size);
+}
+
+
 void
 init_message(void)
 {
@@ -81,9 +90,12 @@ erts_resize_message_buffer(ErlHeapFragment *bp, Uint size,
 #endif
     ErlHeapFragment* nbp;
 
+    /* ToDo: Make use of 'used_size' to avoid realloc
+	when shrinking just a few words */
+
 #ifdef DEBUG
     {
-	Uint off_sz = size < bp->size ? size : bp->size;
+	Uint off_sz = size < bp->used_size ? size : bp->used_size;
 	for (i = 0; i < brefs_size; i++) {
 	    Eterm *ptr;
 	    if (is_immed(brefs[i]))
@@ -95,12 +107,12 @@ erts_resize_message_buffer(ErlHeapFragment *bp, Uint size,
     }
 #endif
 
-    if (size == bp->size)
+    if (size == bp->used_size)
 	return bp;
 
 #ifdef HARD_DEBUG
     dbg_brefs = erts_alloc(ERTS_ALC_T_UNDEF, sizeof(Eterm *)*brefs_size);
-    dbg_bp = new_message_buffer(bp->size);
+    dbg_bp = new_message_buffer(bp->used_size);
     dbg_hp = dbg_bp->mem;
     dbg_tot_size = 0;
     for (i = 0; i < brefs_size; i++) {
@@ -109,15 +121,15 @@ erts_resize_message_buffer(ErlHeapFragment *bp, Uint size,
 	dbg_brefs[i] = copy_struct(brefs[i], dbg_size, &dbg_hp,
 				   &dbg_bp->off_heap);
     }
-    ASSERT(dbg_tot_size == (size < bp->size ? size : bp->size));
+    ASSERT(dbg_tot_size == (size < bp->used_size ? size : bp->used_size));
 #endif
 
     nbp = (ErlHeapFragment*) ERTS_HEAP_REALLOC(ERTS_ALC_T_HEAP_FRAG,
 					       (void *) bp,
-					       ERTS_HEAP_FRAG_SIZE(bp->size),
+					       ERTS_HEAP_FRAG_SIZE(bp->alloc_size),
 					       ERTS_HEAP_FRAG_SIZE(size));
     if (bp != nbp) {
-	Uint off_sz = size < nbp->size ? size : nbp->size;
+	Uint off_sz = size < nbp->used_size ? size : nbp->used_size;
 	Eterm *sp = &bp->mem[0];
 	Eterm *ep = sp + off_sz;
 	Sint offs = &nbp->mem[0] - sp;
@@ -135,7 +147,7 @@ erts_resize_message_buffer(ErlHeapFragment *bp, Uint size,
 	}
 #endif
     }
-    nbp->size = size;
+    nbp->alloc_size = size;
     nbp->used_size = size;
 
 #ifdef HARD_DEBUG
@@ -168,10 +180,15 @@ erts_cleanup_offheap(ErlOffHeap *offheap)
 void
 free_message_buffer(ErlHeapFragment* bp)
 {
-    erts_cleanup_offheap(&bp->off_heap);
-    ERTS_HEAP_FREE(ERTS_ALC_T_HEAP_FRAG,
-		   (void *) bp,
-		   ERTS_HEAP_FRAG_SIZE(bp->size));
+    ASSERT(bp != NULL);
+    do {
+	ErlHeapFragment* next_bp = bp->next;
+
+	erts_cleanup_offheap(&bp->off_heap);
+	ERTS_HEAP_FREE(ERTS_ALC_T_HEAP_FRAG, (void *) bp,
+		       ERTS_HEAP_FRAG_SIZE(bp->size));	
+	bp = next_bp;
+    }while (bp != NULL);
 }
 
 static ERTS_INLINE void
@@ -181,7 +198,7 @@ link_mbuf_to_proc(Process *proc, ErlHeapFragment *bp)
 	/* Link the message buffer */
 	bp->next = MBUF(proc);
 	MBUF(proc) = bp;
-	MBUF_SIZE(proc) += bp->size;
+	MBUF_SIZE(proc) += bp->used_size;
 	FLAGS(proc) |= F_FORCE_GC;
 
 	/* Move any binaries into the process */
@@ -242,7 +259,7 @@ erts_msg_distext2heap(Process *pp,
 	goto decode_error;
     if (is_not_nil(*tokenp)) {
 	ErlHeapFragment *heap_frag = erts_dist_ext_trailer(dist_extp);
-	tok_sz = heap_frag->size;
+	tok_sz = heap_frag->used_size;
 	sz += tok_sz;
     }
     if (pp)
@@ -283,12 +300,13 @@ erts_msg_distext2heap(Process *pp,
 	erts_cleanup_offheap(&heap_frag->off_heap);
     }
     erts_free_dist_ext_copy(dist_extp);
-    if (*bpp)
+    if (*bpp) {
 	free_message_buffer(*bpp);
+	*bpp = NULL;
+    }    
     else if (hp) {
 	HRelease(pp, hp_end, hp);
     }
-    *bpp = NULL;
     return THE_NON_VALUE;
  }
 
@@ -436,11 +454,10 @@ erts_queue_message(Process* receiver,
     ERL_MESSAGE_TERM(mp) = message;
     ERL_MESSAGE_TOKEN(mp) = seq_trace_token;
     mp->next = NULL;
+    mp->data.heap_frag = bp;
 
 #ifdef ERTS_SMP
     if (*receiver_locks & ERTS_PROC_LOCK_MAIN) {
-	mp->data.heap_frag = bp;
-
 	/*
 	 * We move 'in queue' to 'private queue' and place
 	 * message at the end of 'private queue' in order
@@ -453,11 +470,9 @@ erts_queue_message(Process* receiver,
 	LINK_MESSAGE_PRIVQ(receiver, mp);
     }
     else {
-	mp->data.heap_frag = bp;
 	LINK_MESSAGE(receiver, mp);
     }
 #else
-    mp->data.heap_frag = bp;
     LINK_MESSAGE(receiver, mp);
 #endif
 
@@ -530,32 +545,27 @@ erts_move_msg_mbuf_to_heap(Eterm** hpp, ErlOffHeap* off_heap, ErlMessage *msg)
 #ifdef HARD_DEBUG
     dbg_term_sz = size_object(term);
     dbg_token_sz = size_object(token);
-    ASSERT(bp->size == dbg_term_sz + dbg_token_sz);
-
-    dbg_bp = new_message_buffer(bp->size);
+    /*ASSERT(dbg_term_sz + dbg_token_sz == erts_msg_used_frag_sz(msg));
+      Copied size may be smaller due to removed SubBins's or garbage.
+      Copied size may be larger due to duplicated shared terms.
+    */
+    dbg_bp = new_message_buffer(dbg_term_sz + dbg_token_sz);
     dbg_hp = dbg_bp->mem;
     dbg_term = copy_struct(term, dbg_term_sz, &dbg_hp, &dbg_bp->off_heap);
     dbg_token = copy_struct(token, dbg_token_sz, &dbg_hp, &dbg_bp->off_heap);
     dbg_thp_start = *hpp;
 #endif
 
-    ASSERT(bp);
-    msg->data.attached = NULL;
+    if (bp->next != NULL) {
+	move_multi_frags(hpp, off_heap, bp, msg->m, 2);
+	goto copy_done;
+    }
 
     off_heap->overhead += bp->off_heap.overhead;
-    sz = bp->size;
+    sz = bp->used_size;
 
-#ifdef DEBUG
-    if (is_not_immed(term)) {
-	ASSERT(bp->mem <= ptr_val(term));
-	ASSERT(bp->mem + bp->size > ptr_val(term));
-    }
-
-    if (is_not_immed(token)) {
-	ASSERT(bp->mem <= ptr_val(token));
-	ASSERT(bp->mem + bp->size > ptr_val(token));
-    }
-#endif
+    ASSERT(is_immed(term) || in_heapfrag(ptr_val(term),bp));
+    ASSERT(is_immed(token) || in_heapfrag(ptr_val(token),bp));
 
     fhp = bp->mem;
     hp = *hpp;
@@ -574,8 +584,7 @@ erts_move_msg_mbuf_to_heap(Eterm** hpp, ErlOffHeap* off_heap, ErlMessage *msg)
 	    break;
 	case TAG_PRIMARY_LIST:
 	case TAG_PRIMARY_BOXED:
-	    ASSERT(bp->mem <= ptr_val(val));
-	    ASSERT(bp->mem + bp->size > ptr_val(val));
+	    ASSERT(in_heapfrag(ptr_val(val), bp));
 	    *hp++ = offset_ptr(val, offs);
 	    break;
 	case TAG_PRIMARY_HEADER:
@@ -609,6 +618,7 @@ erts_move_msg_mbuf_to_heap(Eterm** hpp, ErlOffHeap* off_heap, ErlMessage *msg)
 		cpy_sz = header_arity(val);
 
 	    cpy_words:
+		ASSERT(sz >= cpy_sz);
 		sz -= cpy_sz;
 		while (cpy_sz >= 8) {
 		    cpy_sz -= 8;
@@ -676,12 +686,11 @@ erts_move_msg_mbuf_to_heap(Eterm** hpp, ErlOffHeap* off_heap, ErlMessage *msg)
 	}
     }
 
-    ASSERT(bp->size == hp - *hpp);
+    ASSERT(bp->used_size == hp - *hpp);
     *hpp = hp;
 
     if (is_not_immed(token)) {
-	ASSERT(bp->mem <= ptr_val(token));
-	ASSERT(bp->mem + bp->size > ptr_val(token));
+	ASSERT(in_heapfrag(ptr_val(token), bp));
 	ERL_MESSAGE_TOKEN(msg) = offset_ptr(token, offs);
 #ifdef HARD_DEBUG
 	ASSERT(dbg_thp_start <= ptr_val(ERL_MESSAGE_TOKEN(msg)));
@@ -690,8 +699,7 @@ erts_move_msg_mbuf_to_heap(Eterm** hpp, ErlOffHeap* off_heap, ErlMessage *msg)
     }
 
     if (is_not_immed(term)) {
-	ASSERT(bp->mem <= ptr_val(term));
-	ASSERT(bp->mem + bp->size > ptr_val(term));
+	ASSERT(in_heapfrag(ptr_val(term),bp));
 	ERL_MESSAGE_TERM(msg) = offset_ptr(term, offs);
 #ifdef HARD_DEBUG
 	ASSERT(dbg_thp_start <= ptr_val(ERL_MESSAGE_TERM(msg)));
@@ -699,10 +707,12 @@ erts_move_msg_mbuf_to_heap(Eterm** hpp, ErlOffHeap* off_heap, ErlMessage *msg)
 #endif
     }
 
+copy_done:
 
 #ifdef HARD_DEBUG
     {
 	int i, j;
+	ErlHeapFragment* frag;
 	{
 	    ProcBin *mso = off_heap->mso;
 	    i = j = 0;
@@ -710,10 +720,12 @@ erts_move_msg_mbuf_to_heap(Eterm** hpp, ErlOffHeap* off_heap, ErlMessage *msg)
 		mso = mso->next;
 		i++;
 	    }
-	    mso = bp->off_heap.mso;
-	    while (mso) {
-		mso = mso->next;
-		j++;
+	    for (frag=bp; frag; frag=frag->next) {
+		mso = frag->off_heap.mso;
+		while (mso) {
+		    mso = mso->next;
+		    j++;
+		}
 	    }
 	    ASSERT(i == j);
 	}
@@ -724,10 +736,12 @@ erts_move_msg_mbuf_to_heap(Eterm** hpp, ErlOffHeap* off_heap, ErlMessage *msg)
 		fun = fun->next;
 		i++;
 	    }
-	    fun = bp->off_heap.funs;
-	    while (fun) {
-		fun = fun->next;
-		j++;
+	    for (frag=bp; frag; frag=frag->next) {
+		fun = frag->off_heap.funs;
+		while (fun) {
+		    fun = fun->next;
+		    j++;
+		}
 	    }
 	    ASSERT(i == j);
 	}
@@ -738,10 +752,12 @@ erts_move_msg_mbuf_to_heap(Eterm** hpp, ErlOffHeap* off_heap, ErlMessage *msg)
 		external = external->next;
 		i++;
 	    }
-	    external = bp->off_heap.externals;
-	    while (external) {
-		external = external->next;
-		j++;
+	    for (frag=bp; frag; frag=frag->next) {
+		external = frag->off_heap.externals;
+		while (external) {
+		    external = external->next;
+		    j++;
+		}
 	    }
 	    ASSERT(i == j);
 	}
@@ -755,6 +771,7 @@ erts_move_msg_mbuf_to_heap(Eterm** hpp, ErlOffHeap* off_heap, ErlMessage *msg)
 #endif
     bp->off_heap.externals = NULL;
     free_message_buffer(bp);
+    msg->data.heap_frag = NULL;
 
 #ifdef HARD_DEBUG
     ASSERT(eq(ERL_MESSAGE_TERM(msg), dbg_term));
@@ -764,6 +781,7 @@ erts_move_msg_mbuf_to_heap(Eterm** hpp, ErlOffHeap* off_heap, ErlMessage *msg)
 
 }
 
+
 Uint
 erts_msg_attached_data_size_aux(ErlMessage *msg)
 {
@@ -789,7 +807,7 @@ erts_msg_attached_data_size_aux(ErlMessage *msg)
     if (is_not_nil(msg->m[1])) {
 	ErlHeapFragment *heap_frag;
 	heap_frag = erts_dist_ext_trailer(msg->data.dist_ext);
-	sz += heap_frag->size;
+	sz += heap_frag->used_size;
     }
     return sz;
 }
@@ -805,7 +823,7 @@ erts_move_msg_attached_data_to_heap(Eterm **hpp, ErlOffHeap *ohp, ErlMessage *ms
 	    ErlHeapFragment *heap_frag;
 	    heap_frag = erts_dist_ext_trailer(msg->data.dist_ext);
 	    ERL_MESSAGE_TOKEN(msg) = copy_struct(ERL_MESSAGE_TOKEN(msg),
-						 heap_frag->size,
+						 heap_frag->used_size,
 						 hpp,
 						 ohp);
 	    erts_cleanup_offheap(&heap_frag->off_heap);
@@ -1062,3 +1080,4 @@ erts_deliver_exit_message(Eterm from, Process *to, ErtsProcLocks *to_locksp,
 	erts_queue_message(to, to_locksp, bp, save, NIL);
     }
 }
+
diff --git a/erts/emulator/beam/erl_message.h b/erts/emulator/beam/erl_message.h
index 489dee7b37..f478572ac2 100644
--- a/erts/emulator/beam/erl_message.h
+++ b/erts/emulator/beam/erl_message.h
@@ -49,7 +49,7 @@ typedef struct erl_heap_fragment ErlHeapFragment;
 struct erl_heap_fragment {
     ErlHeapFragment* next;	/* Next heap fragment */
     ErlOffHeap off_heap;	/* Offset heap data. */
-    unsigned size;		/* Size in (half)words of mem */
+    unsigned alloc_size;	/* Size in (half)words of mem */
     unsigned used_size;         /* With terms to be moved to heap by GC */
     Eterm mem[1];		/* Data */
 };
@@ -199,7 +199,7 @@ do {									\
 #define ERTS_INIT_HEAP_FRAG(HEAP_FRAG_P, DATA_WORDS)	\
 do {							\
     (HEAP_FRAG_P)->next = NULL;				\
-    (HEAP_FRAG_P)->size = (DATA_WORDS);			\
+    (HEAP_FRAG_P)->alloc_size = (DATA_WORDS);		\
     (HEAP_FRAG_P)->used_size = (DATA_WORDS);            \
     (HEAP_FRAG_P)->off_heap.mso = NULL;			\
     (HEAP_FRAG_P)->off_heap.funs = NULL;		\
@@ -227,14 +227,25 @@ void erts_move_msg_attached_data_to_heap(Eterm **, ErlOffHeap *, ErlMessage *);
 Eterm erts_msg_distext2heap(Process *, ErtsProcLocks *, ErlHeapFragment **,
 			    Eterm *, ErtsDistExternal *);
 
+ERTS_GLB_INLINE Uint erts_msg_used_frag_sz(const ErlMessage *msg);
 ERTS_GLB_INLINE Uint erts_msg_attached_data_size(ErlMessage *msg);
 
 #if ERTS_GLB_INLINE_INCL_FUNC_DEF
+ERTS_GLB_INLINE Uint erts_msg_used_frag_sz(const ErlMessage *msg)
+{
+    const ErlHeapFragment *bp;
+    Uint sz = 0;
+    for (bp = msg->data.heap_frag; bp!=NULL; bp=bp->next) {
+	sz += bp->used_size;
+    }
+    return sz;
+}
+
 ERTS_GLB_INLINE Uint erts_msg_attached_data_size(ErlMessage *msg)
 {
     ASSERT(msg->data.attached);
     if (is_value(ERL_MESSAGE_TERM(msg)))
-	return msg->data.heap_frag->size;
+	return erts_msg_used_frag_sz(msg);
     else if (msg->data.dist_ext->heap_size < 0)
 	return erts_msg_attached_data_size_aux(msg);
     else {
@@ -242,7 +253,7 @@ ERTS_GLB_INLINE Uint erts_msg_attached_data_size(ErlMessage *msg)
 	if (is_not_nil(ERL_MESSAGE_TOKEN(msg))) {
 	    ErlHeapFragment *heap_frag;
 	    heap_frag = erts_dist_ext_trailer(msg->data.dist_ext);
-	    sz += heap_frag->size;
+	    sz += heap_frag->used_size;
 	}
 	return sz;
     }
diff --git a/erts/emulator/beam/erl_nif.c b/erts/emulator/beam/erl_nif.c
index 7095ae03e7..75de00d4c1 100644
--- a/erts/emulator/beam/erl_nif.c
+++ b/erts/emulator/beam/erl_nif.c
@@ -48,7 +48,7 @@ struct erl_module_nif {
     struct enif_entry_t* entry;
     erts_refc_t rt_cnt;       /* number of resource types */
     erts_refc_t rt_dtor_cnt;  /* number of resource types with destructors */
-    int is_orphan;            /* if erlang module has been purged */
+    Module* mod;           /* Can be NULL if orphan with dtor-resources left */ 
 };
 
 #ifdef DEBUG
@@ -61,6 +61,10 @@ static void add_readonly_check(ErlNifEnv*, unsigned char* ptr, unsigned sz);
 #  define ADD_READONLY_CHECK(ENV,PTR,SIZE) ((void)0)
 #endif
 
+#ifdef DEBUG
+static int is_offheap(const ErlOffHeap* off_heap);
+#endif
+
 
 #define MIN_HEAP_FRAG_SZ 200
 static Eterm* alloc_heap_heavy(ErlNifEnv* env, unsigned need, Eterm* hp);
@@ -84,7 +88,8 @@ static Eterm* alloc_heap_heavy(ErlNifEnv* env, unsigned need, Eterm* hp)
 	HEAP_TOP(env->proc) = env->hp;	
     }
     else {
-	HRelease(env->proc, env->hp_end, env->hp);
+	env->heap_frag->used_size = hp - env->heap_frag->mem;
+	ASSERT(env->heap_frag->used_size <= env->heap_frag->alloc_size);
     }
     frag_sz = need + MIN_HEAP_FRAG_SZ;
     hp = erts_heap_alloc(env->proc, frag_sz);
@@ -143,8 +148,9 @@ void erts_post_nif(ErlNifEnv* env)
     }
     else {
 	ASSERT(env->hp_end != HEAP_LIMIT(env->proc));
-	ASSERT(env->hp_end - env->hp <= env->heap_frag->size);
-	HRelease(env->proc, env->hp_end, env->hp);
+	ASSERT(env->hp_end - env->hp <= env->heap_frag->alloc_size);
+	env->heap_frag->used_size = env->hp - env->heap_frag->mem;
+	ASSERT(env->heap_frag->used_size <= env->heap_frag->alloc_size);
     }
     free_tmp_objs(env);
 }
@@ -158,7 +164,7 @@ static void post_nif_noproc(ErlNifEnv* env)
 
 /* Flush out our cached heap pointers to allow an ordinary HAlloc
 */
-static void enable_halloc(ErlNifEnv* env)
+static void flush_env(ErlNifEnv* env)
 {
     if (env->heap_frag == NULL) {
 	ASSERT(env->hp_end == HEAP_LIMIT(env->proc));
@@ -168,14 +174,15 @@ static void enable_halloc(ErlNifEnv* env)
     }
     else {
 	ASSERT(env->hp_end != HEAP_LIMIT(env->proc));
-	ASSERT(env->hp_end - env->hp <= env->heap_frag->size);
-	HRelease(env->proc, env->hp_end, env->hp);
+	ASSERT(env->hp_end - env->hp <= env->heap_frag->alloc_size);
+	env->heap_frag->used_size = env->hp - env->heap_frag->mem;
+	ASSERT(env->heap_frag->used_size <= env->heap_frag->alloc_size);
     }
 }
 
-/* Restore cached heap pointers
+/* Restore cached heap pointers to allow alloc_heap again.
 */
-static void disable_halloc(ErlNifEnv* env)
+static void cache_env(ErlNifEnv* env)
 {
     if (env->heap_frag == NULL) {
 	ASSERT(env->hp_end == HEAP_LIMIT(env->proc));
@@ -185,34 +192,192 @@ static void disable_halloc(ErlNifEnv* env)
     }
     else {
 	ASSERT(env->hp_end != HEAP_LIMIT(env->proc));
-	ASSERT(env->hp_end - env->hp <= env->heap_frag->size);       
+	ASSERT(env->hp_end - env->hp <= env->heap_frag->alloc_size);       
 	env->heap_frag = MBUF(env->proc);
 	ASSERT(env->heap_frag != NULL);
 	env->hp = env->heap_frag->mem + env->heap_frag->used_size;
-	env->hp_end = env->heap_frag->mem + env->heap_frag->size;
+	env->hp_end = env->heap_frag->mem + env->heap_frag->alloc_size;
     }
 }
-
 void* enif_priv_data(ErlNifEnv* env)
 {
     return env->mod_nif->priv_data;
 }
 
-void* enif_alloc(ErlNifEnv* env, size_t size)
+void* enif_alloc(size_t size)
 {
     return erts_alloc_fnf(ERTS_ALC_T_NIF, (Uint) size);
 }
 
-void* enif_realloc(ErlNifEnv* env, void* ptr, size_t size)
+void* enif_realloc(void* ptr, size_t size)
 {
     return erts_realloc_fnf(ERTS_ALC_T_NIF, ptr, size);
 }
 
-void enif_free(ErlNifEnv* env, void* ptr)
+void enif_free(void* ptr)
 {
     erts_free(ERTS_ALC_T_NIF, ptr);
 }
 
+struct enif_msg_environment_t
+{
+    ErlNifEnv env;
+    Process phony_proc;
+};
+
+ErlNifEnv* enif_alloc_env(void)
+{
+    struct enif_msg_environment_t* msg_env =
+	erts_alloc_fnf(ERTS_ALC_T_NIF, sizeof(struct enif_msg_environment_t));
+    Eterm* phony_heap = (Eterm*) msg_env; /* dummy non-NULL ptr */
+	
+    msg_env->env.hp = phony_heap; 
+    msg_env->env.hp_end = phony_heap;
+    msg_env->env.heap_frag = NULL;
+    msg_env->env.mod_nif = NULL;
+    msg_env->env.tmp_obj_list = (struct enif_tmp_obj_t*) 1; /* invalid non-NULL */
+    msg_env->env.proc = &msg_env->phony_proc;
+    memset(&msg_env->phony_proc, 0, sizeof(Process));
+    HEAP_START(&msg_env->phony_proc) = phony_heap;
+    HEAP_TOP(&msg_env->phony_proc) = phony_heap;
+    HEAP_LIMIT(&msg_env->phony_proc) = phony_heap;
+    HEAP_END(&msg_env->phony_proc) = phony_heap;
+    MBUF(&msg_env->phony_proc) = NULL;
+    msg_env->phony_proc.id = ERTS_INVALID_PID;
+#ifdef FORCE_HEAP_FRAGS
+    msg_env->phony_proc.space_verified = 0;
+    msg_env->phony_proc.space_verified_from = NULL;
+#endif
+    return &msg_env->env;
+}
+void enif_free_env(ErlNifEnv* env)
+{
+    enif_clear_env(env);
+    erts_free(ERTS_ALC_T_NIF, env);
+}
+
+static ERTS_INLINE void clear_offheap(ErlOffHeap* oh)
+{
+    oh->mso = NULL;
+    oh->externals = NULL;
+    oh->funs = NULL;
+    oh->overhead = 0;
+}
+
+void enif_clear_env(ErlNifEnv* env)
+{
+    struct enif_msg_environment_t* menv = (struct enif_msg_environment_t*)env;
+    Process* p = &menv->phony_proc;
+    ASSERT(p == menv->env.proc);
+    ASSERT(p->id == ERTS_INVALID_PID);
+    ASSERT(MBUF(p) == menv->env.heap_frag);
+    if (MBUF(p) != NULL) {
+	erts_cleanup_offheap(&MSO(p));
+	clear_offheap(&MSO(p));
+	free_message_buffer(MBUF(p));
+	MBUF(p) = NULL;
+	menv->env.heap_frag = NULL;
+    }
+    ASSERT(HEAP_TOP(p) == HEAP_END(p));
+    menv->env.hp = menv->env.hp_end = HEAP_TOP(p);
+    
+    ASSERT(!is_offheap(&MSO(p)));
+}
+int enif_send(ErlNifEnv* env, const ErlNifPid* to_pid,
+	      ErlNifEnv* msg_env, ERL_NIF_TERM msg)
+{
+    struct enif_msg_environment_t* menv = (struct enif_msg_environment_t*)msg_env;
+    ErtsProcLocks rp_locks = 0;
+    Process* rp;
+    Process* c_p;
+    ErlHeapFragment* frags;
+#if defined(ERTS_ENABLE_LOCK_CHECK) && defined(ERTS_SMP)
+    ErtsProcLocks rp_had_locks;
+#endif
+    Eterm receiver = to_pid->pid;
+    int flush_me = 0;
+
+    if (env != NULL) {
+	c_p = env->proc;
+	if (receiver == c_p->id) {
+	    rp_locks = ERTS_PROC_LOCK_MAIN;
+	    flush_me = 1;
+	}
+    }
+    else {
+#ifdef ERTS_SMP
+	c_p = NULL;
+#else
+	erl_exit(ERTS_ABORT_EXIT,"enif_send: env==NULL on non-SMP VM");
+#endif
+    }    
+
+#if defined(ERTS_ENABLE_LOCK_CHECK) && defined(ERTS_SMP)
+    rp_had_locks = rp_locks;
+#endif
+    rp = erts_pid2proc_opt(c_p, ERTS_PROC_LOCK_MAIN,
+			   receiver, rp_locks, ERTS_P2P_FLG_SMP_INC_REFC);
+    if (rp == NULL) {
+	ASSERT(env == NULL || receiver != c_p->id);
+	return 0;
+    }
+    flush_env(msg_env);
+    frags = menv->env.heap_frag; 
+    ASSERT(frags == MBUF(&menv->phony_proc));
+    if (frags != NULL) {
+	/* Move all offheap's from phony proc to the first fragment.
+	   Quick and dirty, but erts_move_msg_mbuf_to_heap doesn't care. */
+	ASSERT(!is_offheap(&frags->off_heap));
+	frags->off_heap = MSO(&menv->phony_proc);
+	clear_offheap(&MSO(&menv->phony_proc));
+	menv->env.heap_frag = NULL; 
+	MBUF(&menv->phony_proc) = NULL;
+    }
+    ASSERT(!is_offheap(&MSO(&menv->phony_proc)));
+
+    if (flush_me) {	
+	flush_env(env); /* Needed for ERTS_HOLE_CHECK */ 
+    }
+    erts_queue_message(rp, &rp_locks, frags, msg, am_undefined);
+    if (rp_locks) {	
+	ERTS_SMP_LC_ASSERT(rp_locks == (rp_had_locks | (ERTS_PROC_LOCK_MSGQ | 
+							ERTS_PROC_LOCK_STATUS)));
+	erts_smp_proc_unlock(rp, (ERTS_PROC_LOCK_MSGQ | ERTS_PROC_LOCK_STATUS));
+    }
+    erts_smp_proc_dec_refc(rp);
+    if (flush_me) {
+	cache_env(env);
+    }
+    return 1;
+}
+
+ERL_NIF_TERM enif_make_copy(ErlNifEnv* dst_env, ERL_NIF_TERM src_term)
+{
+    Uint sz;
+    Eterm* hp;
+    sz = size_object(src_term);
+    hp = alloc_heap(dst_env, sz);
+    return copy_struct(src_term, sz, &hp, &MSO(dst_env->proc));
+}
+
+
+#ifdef DEBUG
+static int is_offheap(const ErlOffHeap* oh)
+{
+    return oh->mso != NULL || oh->funs != NULL || oh->externals != NULL;
+}
+#endif
+
+ErlNifPid* enif_self(ErlNifEnv* caller_env, ErlNifPid* pid)
+{
+    pid->pid = caller_env->proc->id;
+    return pid;
+}
+int enif_get_local_pid(ErlNifEnv* env, ERL_NIF_TERM term, ErlNifPid* pid)
+{
+    return is_internal_pid(term) ? (pid->pid=term, 1) : 0;
+}
+
 int enif_is_atom(ErlNifEnv* env, ERL_NIF_TERM term)
 {
     return is_atom(term);
@@ -324,7 +489,7 @@ int enif_inspect_iolist_as_binary(ErlNifEnv* env, Eterm term, ErlNifBinary* bin)
     return 1;
 }
 
-int enif_alloc_binary(ErlNifEnv* env, unsigned size, ErlNifBinary* bin)
+int enif_alloc_binary(size_t size, ErlNifBinary* bin)
 {
     Binary* refbin;
 
@@ -343,7 +508,7 @@ int enif_alloc_binary(ErlNifEnv* env, unsigned size, ErlNifBinary* bin)
     return 1;
 }
 
-int enif_realloc_binary(ErlNifEnv* env, ErlNifBinary* bin, unsigned size)
+int enif_realloc_binary(ErlNifBinary* bin, size_t size)
 {
     if (bin->ref_bin != NULL) {
 	Binary* oldbin;
@@ -361,15 +526,15 @@ int enif_realloc_binary(ErlNifEnv* env, ErlNifBinary* bin, unsigned size)
     }
     else {
 	unsigned char* old_data = bin->data;
-	unsigned cpy_sz = (size < bin->size ? size : bin->size);  
-	enif_alloc_binary(env, size, bin);
+	size_t cpy_sz = (size < bin->size ? size : bin->size);  
+	enif_alloc_binary(size, bin);
 	sys_memcpy(bin->data, old_data, cpy_sz); 
     }
     return 1;
 }
 
 
-void enif_release_binary(ErlNifEnv* env, ErlNifBinary* bin)
+void enif_release_binary(ErlNifBinary* bin)
 {
     if (bin->ref_bin != NULL) {
 	Binary* refbin = bin->ref_bin;
@@ -385,21 +550,21 @@ void enif_release_binary(ErlNifEnv* env, ErlNifBinary* bin)
 #endif
 }
 
-unsigned char* enif_make_new_binary(ErlNifEnv* env, unsigned size,
+unsigned char* enif_make_new_binary(ErlNifEnv* env, size_t size,
 				    ERL_NIF_TERM* termp)
 {
-    enable_halloc(env);
+    flush_env(env);
     *termp = new_binary(env->proc, NULL, size);
-    disable_halloc(env);
+    cache_env(env);
     return binary_bytes(*termp);
 }
 
-int enif_is_identical(ErlNifEnv* env, Eterm lhs, Eterm rhs)
+int enif_is_identical(Eterm lhs, Eterm rhs)
 {
     return EQ(lhs,rhs);
 }
 
-int enif_compare(ErlNifEnv* env, Eterm lhs, Eterm rhs)
+int enif_compare(Eterm lhs, Eterm rhs)
 {
     return cmp(lhs,rhs);
 }
@@ -478,15 +643,15 @@ Eterm enif_make_binary(ErlNifEnv* env, ErlNifBinary* bin)
 	return bin_term;
     }
     else {
-	enable_halloc(env);
+	flush_env(env);
 	bin->bin_term = new_binary(env->proc, bin->data, bin->size);
-	disable_halloc(env);
+	cache_env(env);
 	return bin->bin_term;
     }
 }
 
 Eterm enif_make_sub_binary(ErlNifEnv* env, ERL_NIF_TERM bin_term,
-			   unsigned pos, unsigned size)
+			   size_t pos, size_t size)
 {
     ErlSubBin* sb;
     Eterm orig;
@@ -516,9 +681,11 @@ Eterm enif_make_badarg(ErlNifEnv* env)
     BIF_ERROR(env->proc, BADARG);
 }
 
-int enif_get_atom(ErlNifEnv* env, Eterm atom, char* buf, unsigned len)
+int enif_get_atom(ErlNifEnv* env, Eterm atom, char* buf, unsigned len,
+		  ErlNifCharEncoding encoding)
 {
     Atom* ap;
+    ASSERT(encoding == ERL_NIF_LATIN1);
     if (is_not_atom(atom)) {
 	return 0;
     }
@@ -566,10 +733,8 @@ int enif_get_long(ErlNifEnv* env, Eterm term, long* ip)
 #if SIZEOF_LONG == ERTS_SIZEOF_ETERM
     return term_to_Sint(term, ip);
 #elif SIZEOF_INT == ERTS_SIZEOF_ETERM
-    Uint u;
-    term_to_Sint(term, u);
-    *ip = (long) u;
-    return 1;
+    Sint i;
+    return term_to_Sint(term, &i) ? (*ip = (long) i, 1) : 0;
 #else
 #  error Unknown long word size 
 #endif     
@@ -581,10 +746,7 @@ int enif_get_ulong(ErlNifEnv* env, Eterm term, unsigned long* ip)
     return term_to_Uint(term, ip);
 #elif SIZEOF_INT == ERTS_SIZEOF_ETERM
     Uint u;
-    int r;
-    r = term_to_Uint(term, &u);
-    *ip = (unsigned long) u;
-    return r;
+    return term_to_Uint(term, &u) ? (*ip = (unsigned long) u, 1) : 0;
 #else
 #  error Unknown long word size 
 #endif     
@@ -601,9 +763,11 @@ int enif_get_double(ErlNifEnv* env, Eterm term, double* dp)
     return 1;
 }
 
-int enif_get_atom_length(ErlNifEnv* env, Eterm atom, unsigned* len)
+int enif_get_atom_length(ErlNifEnv* env, Eterm atom, unsigned* len,
+			 ErlNifCharEncoding enc)
 {
     Atom* ap;
+    ASSERT(enc == ERL_NIF_LATIN1);
     if (is_not_atom(atom)) return 0;
     ap = atom_tab(atom_val(atom));
     *len = ap->len;
@@ -674,14 +838,16 @@ ERL_NIF_TERM enif_make_atom_len(ErlNifEnv* env, const char* name, size_t len)
     return am_atom_put(name, len);
 }
 
-int enif_make_existing_atom(ErlNifEnv* env, const char* name, ERL_NIF_TERM* atom)
+int enif_make_existing_atom(ErlNifEnv* env, const char* name, ERL_NIF_TERM* atom,
+			    ErlNifCharEncoding enc)
 {
-    return enif_make_existing_atom_len(env, name, sys_strlen(name), atom);
+    return enif_make_existing_atom_len(env, name, sys_strlen(name), atom, enc);
 }
 
 int enif_make_existing_atom_len(ErlNifEnv* env, const char* name, size_t len,
-				ERL_NIF_TERM* atom)
+				ERL_NIF_TERM* atom, ErlNifCharEncoding encoding)
 {
+    ASSERT(encoding == ERL_NIF_LATIN1);
     return erts_atom_get(name, len, atom);
 }
 
@@ -841,7 +1007,8 @@ struct enif_resource_type_t
     ErlNifResourceDtor* dtor;      /* user destructor function */
     erts_refc_t refc;  /* num of resources of this type (HOTSPOT warning)
                           +1 for active erl_module_nif */
-    char name[1];
+    Eterm module;
+    Eterm name;
 };
 
 /* dummy node in circular list */
@@ -859,14 +1026,14 @@ typedef struct enif_resource_t
 #define SIZEOF_ErlNifResource(SIZE) (offsetof(ErlNifResource,data) + (SIZE))
 #define DATA_TO_RESOURCE(PTR) ((ErlNifResource*)((char*)(PTR) - offsetof(ErlNifResource,data)))
 
-static ErlNifResourceType* find_resource_type(const char* name)
+static ErlNifResourceType* find_resource_type(Eterm module, Eterm name)
 {
     ErlNifResourceType* type;
     for (type = resource_type_list.next;
 	 type != &resource_type_list;
 	 type = type->next) {
 
-	if (sys_strcmp(type->name, name) == 0) {
+	if (type->module == module && type->name == name) {
 	    return type;
 	}
     }
@@ -899,33 +1066,42 @@ static void steal_resource_type(ErlNifResourceType* type)
 
     if (type->dtor != NULL
 	&& erts_refc_dectest(&lib->rt_dtor_cnt, 0) == 0
-	&& lib->is_orphan) {
+	&& lib->mod == NULL) {
 	/* last type with destructor gone, close orphan lib */
 
 	close_lib(lib);
     }
     if (erts_refc_dectest(&lib->rt_cnt, 0) == 0
-	&& lib->is_orphan) {
+	&& lib->mod == NULL) {
 	erts_free(ERTS_ALC_T_NIF, lib);
     }
 }
 
 ErlNifResourceType*
-enif_open_resource_type(ErlNifEnv* env, const char* type_name, 
-			  ErlNifResourceDtor* dtor,
-			  enum ErlNifResourceFlags flags,
-			  enum ErlNifResourceFlags* tried)
+enif_open_resource_type(ErlNifEnv* env,
+			const char* module_str, 
+			const char* name_str, 
+			ErlNifResourceDtor* dtor,
+			ErlNifResourceFlags flags,
+			ErlNifResourceFlags* tried)
 {
-    ErlNifResourceType* type = find_resource_type(type_name);
-    enum ErlNifResourceFlags op = flags;
+    ErlNifResourceType* type = NULL;
+    ErlNifResourceFlags op = flags;
+    Eterm module_am, name_am;
+
     ASSERT(erts_smp_is_system_blocked(0));
+    ASSERT(module_str == NULL); /* for now... */
+    module_am = make_atom(env->mod_nif->mod->module);
+    name_am = enif_make_atom(env, name_str);
+
+    type = find_resource_type(module_am, name_am);
     if (type == NULL) {
 	if (flags & ERL_NIF_RT_CREATE) {
 	    type = erts_alloc(ERTS_ALC_T_NIF,
-			      sizeof(struct enif_resource_type_t) 
-			      + sys_strlen(type_name));
+			      sizeof(struct enif_resource_type_t)); 
 	    type->dtor = dtor;
-	    sys_strcpy(type->name, type_name);
+	    type->module = module_am;
+	    type->name = name_am;
 	    erts_refc_init(&type->refc, 1);
 	    type->owner = env->mod_nif;
 	    type->prev = &resource_type_list;
@@ -973,13 +1149,13 @@ static void nif_resource_dtor(Binary* bin)
     if (erts_refc_dectest(&type->refc, 0) == 0) {
 	ASSERT(type->next == NULL);
 	ASSERT(type->owner != NULL);
-	ASSERT(type->owner->is_orphan);
+	ASSERT(type->owner->mod == NULL);
 	steal_resource_type(type);
 	erts_free(ERTS_ALC_T_NIF, type);
     }
 }
 
-void* enif_alloc_resource(ErlNifEnv* env, ErlNifResourceType* type, unsigned size)
+void* enif_alloc_resource(ErlNifResourceType* type, size_t size)
 {
     Binary* bin = erts_create_magic_binary(SIZEOF_ErlNifResource(size), &nif_resource_dtor);
     ErlNifResource* resource = ERTS_MAGIC_BIN_DATA(bin);
@@ -992,7 +1168,7 @@ void* enif_alloc_resource(ErlNifEnv* env, ErlNifResourceType* type, unsigned siz
     return resource->data;
 }
 
-void enif_release_resource(ErlNifEnv* env, void* obj)
+void enif_release_resource(void* obj)
 {
     ErlNifResource* resource = DATA_TO_RESOURCE(obj);
     ErtsBinary* bin = ERTS_MAGIC_BIN_FROM_DATA(resource);
@@ -1006,6 +1182,18 @@ void enif_release_resource(ErlNifEnv* env, void* obj)
     }
 }
 
+void enif_keep_resource(void* obj)
+{
+    ErlNifResource* resource = DATA_TO_RESOURCE(obj);
+    ErtsBinary* bin = ERTS_MAGIC_BIN_FROM_DATA(resource);
+
+    ASSERT(ERTS_MAGIC_BIN_DESTRUCTOR(bin) == &nif_resource_dtor);
+#ifdef DEBUG
+    erts_refc_inc(&resource->nif_refc, 1);
+#endif
+    erts_refc_inc(&bin->binary.refc, 2);
+}
+
 ERL_NIF_TERM enif_make_resource(ErlNifEnv* env, void* obj)
 {
     ErlNifResource* resource = DATA_TO_RESOURCE(obj);
@@ -1014,15 +1202,30 @@ ERL_NIF_TERM enif_make_resource(ErlNifEnv* env, void* obj)
     return erts_mk_magic_binary_term(&hp, &MSO(env->proc), &bin->binary);
 }
 
+ERL_NIF_TERM enif_make_resource_binary(ErlNifEnv* env, void* obj,
+				       const void* data, size_t size)
+{
+    Eterm bin = enif_make_resource(env, obj);
+    ProcBin* pb = (ProcBin*) binary_val(bin);
+    pb->bytes = (byte*) data;
+    pb->size = size;
+    return bin;
+}
+
 int enif_get_resource(ErlNifEnv* env, ERL_NIF_TERM term, ErlNifResourceType* type,
 		      void** objp)
 {
+    ProcBin* pb;
     Binary* mbin;
     ErlNifResource* resource;
     if (!ERTS_TERM_IS_MAGIC_BINARY(term)) {
 	return 0;
     }
-    mbin = ((ProcBin*) binary_val(term))->val;
+    pb = (ProcBin*) binary_val(term);
+    /*if (pb->size != 0) {	
+	return 0; / * Or should we allow "resource binaries" as handles? * /
+    }*/
+    mbin = pb->val;
     resource = (ErlNifResource*) ERTS_MAGIC_BIN_DATA(mbin);
     if (ERTS_MAGIC_BIN_DESTRUCTOR(mbin) != &nif_resource_dtor
 	|| resource->type != type) {	
@@ -1032,7 +1235,7 @@ int enif_get_resource(ErlNifEnv* env, ERL_NIF_TERM term, ErlNifResourceType* typ
     return 1;
 }
 
-unsigned enif_sizeof_resource(ErlNifEnv* env, void* obj)
+size_t enif_sizeof_resource(void* obj)
 {
     ErlNifResource* resource = DATA_TO_RESOURCE(obj);
     Binary* bin = &ERTS_MAGIC_BIN_FROM_DATA(resource)->binary;
@@ -1262,7 +1465,7 @@ BIF_RETTYPE load_nif_2(BIF_ALIST_2)
     lib->entry = entry;
     erts_refc_init(&lib->rt_cnt, 0);
     erts_refc_init(&lib->rt_dtor_cnt, 0);
-    lib->is_orphan = 0;
+    lib->mod = mod;
     env.mod_nif = lib;
     if (mod->nif != NULL) { /* Reload */
 	int k;
@@ -1376,7 +1579,7 @@ erts_unload_nif(struct erl_module_nif* lib)
     ErlNifResourceType* next;
     ASSERT(erts_smp_is_system_blocked(0));
     ASSERT(lib != NULL);
-    ASSERT(!lib->is_orphan);
+    ASSERT(lib->mod != NULL);
     for (rt = resource_type_list.next;
 	 rt != &resource_type_list;
 	 rt = next) {
@@ -1406,7 +1609,7 @@ erts_unload_nif(struct erl_module_nif* lib)
     else {
 	ASSERT(erts_refc_read(&lib->rt_cnt, 1) > 0);
     }
-    lib->is_orphan = 1;
+    lib->mod = NULL;   /* orphan lib */
 }	
 
 void erl_nif_init()
@@ -1415,7 +1618,8 @@ void erl_nif_init()
     resource_type_list.prev = &resource_type_list;
     resource_type_list.dtor = NULL;
     resource_type_list.owner = NULL;
-    resource_type_list.name[0] = '\0';
+    resource_type_list.module = THE_NON_VALUE;
+    resource_type_list.name = THE_NON_VALUE;
 }
 
 #ifdef READONLY_CHECK
diff --git a/erts/emulator/beam/erl_nif.h b/erts/emulator/beam/erl_nif.h
index a345837569..936f03bce1 100644
--- a/erts/emulator/beam/erl_nif.h
+++ b/erts/emulator/beam/erl_nif.h
@@ -23,14 +23,16 @@
 #ifndef __ERL_NIF_H__
 #define __ERL_NIF_H__
 
+
 #include "erl_drv_nif.h"
 
 /* Version history:
 ** 0.1: R13B03
 ** 1.0: R13B04
+** 2.0: R14A
 */
-#define ERL_NIF_MAJOR_VERSION 1
-#define ERL_NIF_MINOR_VERSION 1
+#define ERL_NIF_MAJOR_VERSION 2
+#define ERL_NIF_MINOR_VERSION 0
 
 #include <stdlib.h>
 
@@ -60,6 +62,10 @@
 #endif
 #include "erl_int_sizes_config.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #ifdef HALFWORD_HEAP_EMULATOR
 typedef unsigned int ERL_NIF_TERM;
 #else
@@ -93,7 +99,7 @@ typedef struct enif_entry_t
 
 typedef struct
 {
-    unsigned size;
+    size_t size;
     unsigned char* data;
 
     /* Internals (avert your eyes) */
@@ -103,17 +109,22 @@ typedef struct
 
 typedef struct enif_resource_type_t ErlNifResourceType;
 typedef void ErlNifResourceDtor(ErlNifEnv*, void*);
-enum ErlNifResourceFlags
+typedef enum
 {
     ERL_NIF_RT_CREATE = 1,
     ERL_NIF_RT_TAKEOVER = 2
-};
+}ErlNifResourceFlags;
 
 typedef enum
 {
     ERL_NIF_LATIN1 = 1
 }ErlNifCharEncoding;
 
+typedef struct
+{
+    ERL_NIF_TERM pid;  /* internal, may change */
+}ErlNifPid;
+
 typedef ErlDrvSysInfo ErlNifSysInfo;
 
 typedef struct ErlDrvTid_ *ErlNifTid;
@@ -146,8 +157,6 @@ extern TWinDynNifCallbacks WinDynNifCallbacks;
 #endif
 
 
-
-
 #if (defined(__WIN32__) || defined(_WIN32) || defined(_WIN32_))
 #  define ERL_NIF_INIT_GLOB TWinDynNifCallbacks WinDynNifCallbacks;
 #  define ERL_NIF_INIT_DECL(MODNAME) __declspec(dllexport) ErlNifEntry* nif_init(TWinDynNifCallbacks* callbacks)
@@ -163,7 +172,18 @@ extern TWinDynNifCallbacks WinDynNifCallbacks;
 #endif
 
 
+#ifdef __cplusplus
+}
+#  define ERL_NIF_INIT_PROLOGUE extern "C" {
+#  define ERL_NIF_INIT_EPILOGUE }
+#else
+#  define ERL_NIF_INIT_PROLOGUE
+#  define ERL_NIF_INIT_EPILOGUE
+#endif
+
+
 #define ERL_NIF_INIT(NAME, FUNCS, LOAD, RELOAD, UPGRADE, UNLOAD) \
+ERL_NIF_INIT_PROLOGUE                   \
 ERL_NIF_INIT_GLOB                       \
 ERL_NIF_INIT_DECL(NAME)			\
 {					\
@@ -178,7 +198,9 @@ ERL_NIF_INIT_DECL(NAME)			\
     };                                  \
     ERL_NIF_INIT_BODY;                  \
     return &entry;			\
-}
+}                                       \
+ERL_NIF_INIT_EPILOGUE
+
 
 #endif /* __ERL_NIF_H__ */
 
diff --git a/erts/emulator/beam/erl_nif_api_funcs.h b/erts/emulator/beam/erl_nif_api_funcs.h
index 44bcca9ca4..ef4e9580b0 100644
--- a/erts/emulator/beam/erl_nif_api_funcs.h
+++ b/erts/emulator/beam/erl_nif_api_funcs.h
@@ -23,29 +23,29 @@
 
 #ifdef ERL_NIF_API_FUNC_DECL
 ERL_NIF_API_FUNC_DECL(void*,enif_priv_data,(ErlNifEnv*));
-ERL_NIF_API_FUNC_DECL(void*,enif_alloc,(ErlNifEnv*, size_t size));
-ERL_NIF_API_FUNC_DECL(void,enif_free,(ErlNifEnv*, void* ptr));
+ERL_NIF_API_FUNC_DECL(void*,enif_alloc,(size_t size));
+ERL_NIF_API_FUNC_DECL(void,enif_free,(void* ptr));
 ERL_NIF_API_FUNC_DECL(int,enif_is_atom,(ErlNifEnv*, ERL_NIF_TERM term));
 ERL_NIF_API_FUNC_DECL(int,enif_is_binary,(ErlNifEnv*, ERL_NIF_TERM term));
 ERL_NIF_API_FUNC_DECL(int,enif_is_ref,(ErlNifEnv*, ERL_NIF_TERM term));
 ERL_NIF_API_FUNC_DECL(int,enif_inspect_binary,(ErlNifEnv*, ERL_NIF_TERM bin_term, ErlNifBinary* bin));
-ERL_NIF_API_FUNC_DECL(int,enif_alloc_binary,(ErlNifEnv*, unsigned size, ErlNifBinary* bin));
-ERL_NIF_API_FUNC_DECL(int,enif_realloc_binary,(ErlNifEnv*, ErlNifBinary* bin, unsigned size));
-ERL_NIF_API_FUNC_DECL(void,enif_release_binary,(ErlNifEnv*, ErlNifBinary* bin));
+ERL_NIF_API_FUNC_DECL(int,enif_alloc_binary,(size_t size, ErlNifBinary* bin));
+ERL_NIF_API_FUNC_DECL(int,enif_realloc_binary,(ErlNifBinary* bin, size_t size));
+ERL_NIF_API_FUNC_DECL(void,enif_release_binary,(ErlNifBinary* bin));
 ERL_NIF_API_FUNC_DECL(int,enif_get_int,(ErlNifEnv*, ERL_NIF_TERM term, int* ip));
 ERL_NIF_API_FUNC_DECL(int,enif_get_ulong,(ErlNifEnv*, ERL_NIF_TERM term, unsigned long* ip));
 ERL_NIF_API_FUNC_DECL(int,enif_get_double,(ErlNifEnv*, ERL_NIF_TERM term, double* dp));
 ERL_NIF_API_FUNC_DECL(int,enif_get_list_cell,(ErlNifEnv* env, ERL_NIF_TERM term, ERL_NIF_TERM* head, ERL_NIF_TERM* tail));
 ERL_NIF_API_FUNC_DECL(int,enif_get_tuple,(ErlNifEnv* env, ERL_NIF_TERM tpl, int* arity, const ERL_NIF_TERM** array));
-ERL_NIF_API_FUNC_DECL(int,enif_is_identical,(ErlNifEnv* env, ERL_NIF_TERM lhs, ERL_NIF_TERM rhs));
-ERL_NIF_API_FUNC_DECL(int,enif_compare,(ErlNifEnv* env, ERL_NIF_TERM lhs, ERL_NIF_TERM rhs));
+ERL_NIF_API_FUNC_DECL(int,enif_is_identical,(ERL_NIF_TERM lhs, ERL_NIF_TERM rhs));
+ERL_NIF_API_FUNC_DECL(int,enif_compare,(ERL_NIF_TERM lhs, ERL_NIF_TERM rhs));
 ERL_NIF_API_FUNC_DECL(ERL_NIF_TERM,enif_make_binary,(ErlNifEnv* env, ErlNifBinary* bin));
 ERL_NIF_API_FUNC_DECL(ERL_NIF_TERM,enif_make_badarg,(ErlNifEnv* env));
 ERL_NIF_API_FUNC_DECL(ERL_NIF_TERM,enif_make_int,(ErlNifEnv* env, int i));
 ERL_NIF_API_FUNC_DECL(ERL_NIF_TERM,enif_make_ulong,(ErlNifEnv* env, unsigned long i));
 ERL_NIF_API_FUNC_DECL(ERL_NIF_TERM,enif_make_double,(ErlNifEnv* env, double d));
 ERL_NIF_API_FUNC_DECL(ERL_NIF_TERM,enif_make_atom,(ErlNifEnv* env, const char* name));
-ERL_NIF_API_FUNC_DECL(int,enif_make_existing_atom,(ErlNifEnv* env, const char* name, ERL_NIF_TERM* atom));
+ERL_NIF_API_FUNC_DECL(int,enif_make_existing_atom,(ErlNifEnv* env, const char* name, ERL_NIF_TERM* atom, ErlNifCharEncoding));
 ERL_NIF_API_FUNC_DECL(ERL_NIF_TERM,enif_make_tuple,(ErlNifEnv* env, unsigned cnt, ...));
 ERL_NIF_API_FUNC_DECL(ERL_NIF_TERM,enif_make_list,(ErlNifEnv* env, unsigned cnt, ...));
 ERL_NIF_API_FUNC_DECL(ERL_NIF_TERM,enif_make_list_cell,(ErlNifEnv* env, ERL_NIF_TERM car, ERL_NIF_TERM cdr));
@@ -82,13 +82,13 @@ ERL_NIF_API_FUNC_DECL(int,enif_equal_tids,(ErlNifTid tid1, ErlNifTid tid2));
 ERL_NIF_API_FUNC_DECL(void,enif_thread_exit,(void *resp));
 ERL_NIF_API_FUNC_DECL(int,enif_thread_join,(ErlNifTid, void **respp));
 
-ERL_NIF_API_FUNC_DECL(void*,enif_realloc,(ErlNifEnv*, void* ptr, size_t size));
+ERL_NIF_API_FUNC_DECL(void*,enif_realloc,(void* ptr, size_t size));
 ERL_NIF_API_FUNC_DECL(void,enif_system_info,(ErlNifSysInfo *sip, size_t si_size));
 ERL_NIF_API_FUNC_DECL(int,enif_fprintf,(void/* FILE* */ *filep, const char *format, ...));
 ERL_NIF_API_FUNC_DECL(int,enif_inspect_iolist_as_binary,(ErlNifEnv*, ERL_NIF_TERM term, ErlNifBinary* bin));
-ERL_NIF_API_FUNC_DECL(ERL_NIF_TERM,enif_make_sub_binary,(ErlNifEnv*, ERL_NIF_TERM bin_term, unsigned pos, unsigned size));
+ERL_NIF_API_FUNC_DECL(ERL_NIF_TERM,enif_make_sub_binary,(ErlNifEnv*, ERL_NIF_TERM bin_term, size_t pos, size_t size));
 ERL_NIF_API_FUNC_DECL(int,enif_get_string,(ErlNifEnv*, ERL_NIF_TERM list, char* buf, unsigned len, ErlNifCharEncoding));
-ERL_NIF_API_FUNC_DECL(int,enif_get_atom,(ErlNifEnv*, ERL_NIF_TERM atom, char* buf, unsigned len));
+ERL_NIF_API_FUNC_DECL(int,enif_get_atom,(ErlNifEnv*, ERL_NIF_TERM atom, char* buf, unsigned len, ErlNifCharEncoding));
 ERL_NIF_API_FUNC_DECL(int,enif_is_fun,(ErlNifEnv*, ERL_NIF_TERM term));
 ERL_NIF_API_FUNC_DECL(int,enif_is_pid,(ErlNifEnv*, ERL_NIF_TERM term));
 ERL_NIF_API_FUNC_DECL(int,enif_is_port,(ErlNifEnv*, ERL_NIF_TERM term));
@@ -99,20 +99,29 @@ ERL_NIF_API_FUNC_DECL(ERL_NIF_TERM,enif_make_long,(ErlNifEnv*, long i));
 ERL_NIF_API_FUNC_DECL(ERL_NIF_TERM,enif_make_tuple_from_array,(ErlNifEnv*, const ERL_NIF_TERM arr[], unsigned cnt));
 ERL_NIF_API_FUNC_DECL(ERL_NIF_TERM,enif_make_list_from_array,(ErlNifEnv*, const ERL_NIF_TERM arr[], unsigned cnt));
 ERL_NIF_API_FUNC_DECL(int,enif_is_empty_list,(ErlNifEnv*, ERL_NIF_TERM term));
-ERL_NIF_API_FUNC_DECL(ErlNifResourceType*,enif_open_resource_type,(ErlNifEnv*, const char* type_name, void (*dtor)(ErlNifEnv*,void *), enum ErlNifResourceFlags flags, enum ErlNifResourceFlags* tried));
-ERL_NIF_API_FUNC_DECL(void*,enif_alloc_resource,(ErlNifEnv*, ErlNifResourceType* type, unsigned size));
-ERL_NIF_API_FUNC_DECL(void,enif_release_resource,(ErlNifEnv*, void* obj));
+ERL_NIF_API_FUNC_DECL(ErlNifResourceType*,enif_open_resource_type,(ErlNifEnv*, const char* module_str, const char* name_str, void (*dtor)(ErlNifEnv*,void *), ErlNifResourceFlags flags, ErlNifResourceFlags* tried));
+ERL_NIF_API_FUNC_DECL(void*,enif_alloc_resource,(ErlNifResourceType* type, size_t size));
+ERL_NIF_API_FUNC_DECL(void,enif_release_resource,(void* obj));
 ERL_NIF_API_FUNC_DECL(ERL_NIF_TERM,enif_make_resource,(ErlNifEnv*, void* obj));
 ERL_NIF_API_FUNC_DECL(int,enif_get_resource,(ErlNifEnv*, ERL_NIF_TERM term, ErlNifResourceType* type, void** objp));
-ERL_NIF_API_FUNC_DECL(unsigned,enif_sizeof_resource,(ErlNifEnv*, void* obj));
-ERL_NIF_API_FUNC_DECL(unsigned char*,enif_make_new_binary,(ErlNifEnv*,unsigned size,ERL_NIF_TERM* termp));
+ERL_NIF_API_FUNC_DECL(size_t,enif_sizeof_resource,(void* obj));
+ERL_NIF_API_FUNC_DECL(unsigned char*,enif_make_new_binary,(ErlNifEnv*,size_t size,ERL_NIF_TERM* termp));
 ERL_NIF_API_FUNC_DECL(int,enif_is_list,(ErlNifEnv*, ERL_NIF_TERM term));
 ERL_NIF_API_FUNC_DECL(int,enif_is_tuple,(ErlNifEnv*, ERL_NIF_TERM term));
-ERL_NIF_API_FUNC_DECL(int,enif_get_atom_length,(ErlNifEnv*, ERL_NIF_TERM atom, unsigned* len));
+ERL_NIF_API_FUNC_DECL(int,enif_get_atom_length,(ErlNifEnv*, ERL_NIF_TERM atom, unsigned* len, ErlNifCharEncoding));
 ERL_NIF_API_FUNC_DECL(int,enif_get_list_length,(ErlNifEnv* env, ERL_NIF_TERM term, unsigned* len));
 ERL_NIF_API_FUNC_DECL(ERL_NIF_TERM, enif_make_atom_len,(ErlNifEnv* env, const char* name, size_t len));
-ERL_NIF_API_FUNC_DECL(int, enif_make_existing_atom_len,(ErlNifEnv* env, const char* name, size_t len, ERL_NIF_TERM* atom));
+ERL_NIF_API_FUNC_DECL(int, enif_make_existing_atom_len,(ErlNifEnv* env, const char* name, size_t len, ERL_NIF_TERM* atom, ErlNifCharEncoding));
 ERL_NIF_API_FUNC_DECL(ERL_NIF_TERM,enif_make_string_len,(ErlNifEnv* env, const char* string, size_t len, ErlNifCharEncoding));
+ERL_NIF_API_FUNC_DECL(ErlNifEnv*,enif_alloc_env,(void));
+ERL_NIF_API_FUNC_DECL(void,enif_free_env,(ErlNifEnv* env));
+ERL_NIF_API_FUNC_DECL(void,enif_clear_env,(ErlNifEnv* env));
+ERL_NIF_API_FUNC_DECL(int,enif_send,(ErlNifEnv* env, const ErlNifPid* to_pid, ErlNifEnv* msg_env, ERL_NIF_TERM msg));
+ERL_NIF_API_FUNC_DECL(ERL_NIF_TERM,enif_make_copy,(ErlNifEnv* dst_env, ERL_NIF_TERM src_term));
+ERL_NIF_API_FUNC_DECL(ErlNifPid*,enif_self,(ErlNifEnv* caller_env, ErlNifPid* pid));
+ERL_NIF_API_FUNC_DECL(int,enif_get_local_pid,(ErlNifEnv* env, ERL_NIF_TERM, ErlNifPid* pid));
+ERL_NIF_API_FUNC_DECL(void,enif_keep_resource,(void* obj));
+ERL_NIF_API_FUNC_DECL(ERL_NIF_TERM,enif_make_resource_binary,(ErlNifEnv*,void* obj,const void* data, size_t size));
 
 /*
 ** Add last to keep compatibility on Windows!!!
@@ -212,6 +221,15 @@ ERL_NIF_API_FUNC_DECL(ERL_NIF_TERM,enif_make_string_len,(ErlNifEnv* env, const c
 #  define enif_make_atom_len ERL_NIF_API_FUNC_MACRO(enif_make_atom_len)
 #  define enif_make_existing_atom_len ERL_NIF_API_FUNC_MACRO(enif_make_existing_atom_len)
 #  define enif_make_string_len ERL_NIF_API_FUNC_MACRO(enif_make_string_len)
+#  define enif_alloc_env ERL_NIF_API_FUNC_MACRO(enif_alloc_env)
+#  define enif_free_env ERL_NIF_API_FUNC_MACRO(enif_free_env)
+#  define enif_clear_env ERL_NIF_API_FUNC_MACRO(enif_clear_env)
+#  define enif_send ERL_NIF_API_FUNC_MACRO(enif_send)
+#  define enif_make_copy ERL_NIF_API_FUNC_MACRO(enif_make_copy)
+#  define enif_self ERL_NIF_API_FUNC_MACRO(enif_self)
+#  define enif_get_local_pid ERL_NIF_API_FUNC_MACRO(enif_get_local_pid)
+#  define enif_keep_resource ERL_NIF_API_FUNC_MACRO(enif_keep_resource)
+#  define enif_make_resource_binary ERL_NIF_API_FUNC_MACRO(enif_make_resource_binary)
 #endif
 
 #ifndef enif_make_list1
@@ -233,9 +251,7 @@ ERL_NIF_API_FUNC_DECL(ERL_NIF_TERM,enif_make_string_len,(ErlNifEnv* env, const c
 #  define enif_make_tuple7(ENV,E1,E2,E3,E4,E5,E6,E7) enif_make_tuple(ENV,7,E1,E2,E3,E4,E5,E6,E7)
 #  define enif_make_tuple8(ENV,E1,E2,E3,E4,E5,E6,E7,E8) enif_make_tuple(ENV,8,E1,E2,E3,E4,E5,E6,E7,E8)
 #  define enif_make_tuple9(ENV,E1,E2,E3,E4,E5,E6,E7,E8,E9) enif_make_tuple(ENV,9,E1,E2,E3,E4,E5,E6,E7,E8,E9)
-#endif
 
-#ifndef enif_get_data
-#  define enif_get_data enif_priv_data /* deprecated */
+#  define enif_make_pid(ENV, PID) ((const ERL_NIF_TERM)((PID)->pid))
 #endif
 
diff --git a/erts/emulator/beam/erl_process.c b/erts/emulator/beam/erl_process.c
index 11ca85a41c..e329bfd2d1 100644
--- a/erts/emulator/beam/erl_process.c
+++ b/erts/emulator/beam/erl_process.c
@@ -7187,8 +7187,6 @@ erts_debug_verify_clean_empty_process(Process* p)
 void
 erts_cleanup_empty_process(Process* p)
 {
-    ErlHeapFragment* mbufp;
-
     /* We only check fields that are known to be used... */
 
     erts_cleanup_offheap(&p->off_heap);
@@ -7199,13 +7197,10 @@ erts_cleanup_empty_process(Process* p)
     p->off_heap.externals = NULL;
     p->off_heap.overhead = 0;
 
-    mbufp = p->mbuf;
-    while (mbufp) {
-	ErlHeapFragment *next = mbufp->next;
-	free_message_buffer(mbufp);
-	mbufp = next;
+    if (p->mbuf != NULL) {
+	free_message_buffer(p->mbuf);
+	p->mbuf = NULL;
     }
-    p->mbuf = NULL;
 #if defined(ERTS_ENABLE_LOCK_COUNT) && defined(ERTS_SMP)
     erts_lcnt_proc_lock_destroy(p);
 #endif
@@ -7221,7 +7216,6 @@ static void
 delete_process(Process* p)
 {
     ErlMessage* mp;
-    ErlHeapFragment* bp;
 
     VERBOSE(DEBUG_PROCESSES, ("Removing process: %T\n",p->id));
 
@@ -7271,11 +7265,8 @@ delete_process(Process* p)
     /*
      * Free all pending message buffers.
      */
-    bp = p->mbuf;
-    while (bp != NULL) {
-	ErlHeapFragment* next_bp = bp->next;
-	free_message_buffer(bp);
-	bp = next_bp;
+    if (p->mbuf != NULL) {	
+	free_message_buffer(p->mbuf);
     }
 
     erts_erase_dicts(p);
diff --git a/erts/emulator/beam/erl_process.h b/erts/emulator/beam/erl_process.h
index cbcdec4ba7..e2cb523cf5 100644
--- a/erts/emulator/beam/erl_process.h
+++ b/erts/emulator/beam/erl_process.h
@@ -765,7 +765,7 @@ ERTS_GLB_INLINE void erts_heap_frag_shrink(Process* p, Eterm* hp)
 {
     ErlHeapFragment* hf = MBUF(p);
 
-    ASSERT(hf!=NULL && (hp - hf->mem < (unsigned long)hf->size));
+    ASSERT(hf!=NULL && (hp - hf->mem < (unsigned long)hf->alloc_size));
 
     hf->used_size = hp - hf->mem;
 }	
diff --git a/erts/emulator/beam/erl_vm.h b/erts/emulator/beam/erl_vm.h
index eeeeb7ccfd..cd63401581 100644
--- a/erts/emulator/beam/erl_vm.h
+++ b/erts/emulator/beam/erl_vm.h
@@ -84,6 +84,7 @@
 
 #define ErtsHAllocLockCheck(P) \
   ERTS_SMP_LC_ASSERT((ERTS_PROC_LOCK_MAIN & erts_proc_lc_my_proc_locks((P))) \
+      	             || ((P)->id == ERTS_INVALID_PID) \
 		     || ((P)->scheduler_data \
 			 && (P) == (P)->scheduler_data->match_pseudo_process) \
 		     || erts_is_system_blocked(0))
diff --git a/erts/emulator/beam/global.h b/erts/emulator/beam/global.h
index d5d63631ff..19dd3d6f97 100644
--- a/erts/emulator/beam/global.h
+++ b/erts/emulator/beam/global.h
@@ -881,6 +881,8 @@ Eterm copy_object(Eterm, Process*);
 Uint size_object(Eterm);
 Eterm copy_struct(Eterm, Uint, Eterm**, ErlOffHeap*);
 Eterm copy_shallow(Eterm*, Uint, Eterm**, ErlOffHeap*);
+void move_multi_frags(Eterm** hpp, ErlOffHeap*, ErlHeapFragment* first,
+		      Eterm* refs, unsigned nrefs);
 
 #ifdef HYBRID
 #define RRMA_DEFAULT_SIZE 256
@@ -1078,6 +1080,7 @@ Eterm erts_heap_sizes(Process* p);
 void erts_offset_off_heap(ErlOffHeap *, Sint, Eterm*, Eterm*);
 void erts_offset_heap_ptr(Eterm*, Uint, Sint, Eterm*, Eterm*);
 void erts_offset_heap(Eterm*, Uint, Sint, Eterm*, Eterm*);
+void erts_free_heap_frags(Process* p);
 
 #ifdef HYBRID
 int erts_global_garbage_collect(Process*, int, Eterm*, int);
diff --git a/erts/emulator/beam/utils.c b/erts/emulator/beam/utils.c
index 51c12a0b69..445a8eebd9 100644
--- a/erts/emulator/beam/utils.c
+++ b/erts/emulator/beam/utils.c
@@ -32,6 +32,7 @@
 #include "erl_binary.h"
 #include "erl_bits.h"
 #include "packet_parser.h"
+#include "erl_gc.h"
 #define ERTS_WANT_DB_INTERNAL__
 #include "erl_db.h"
 #include "erl_threads.h"
@@ -125,7 +126,7 @@ erts_heap_alloc(Process* p, Uint need)
 
     n = need;
     bp = MBUF(p);
-    if (bp != NULL && need <= (bp->size - bp->used_size)) {
+    if (bp != NULL && need <= (bp->alloc_size - bp->used_size)) {
 	Eterm* ret = bp->mem + bp->used_size;
 	bp->used_size += need;
 	return ret;
@@ -158,7 +159,7 @@ erts_heap_alloc(Process* p, Uint need)
 
     bp->next = MBUF(p);
     MBUF(p) = bp;
-    bp->size = n;
+    bp->alloc_size = n;
     bp->used_size = n;
     MBUF_SIZE(p) += n;
     bp->off_heap.mso = NULL;
diff --git a/erts/emulator/hipe/hipe_gc.c b/erts/emulator/hipe/hipe_gc.c
index e57e293547..6c9e1d9ba7 100644
--- a/erts/emulator/hipe/hipe_gc.c
+++ b/erts/emulator/hipe/hipe_gc.c
@@ -1,19 +1,19 @@
 /*
  * %CopyrightBegin%
- * 
- * Copyright Ericsson AB 2004-2009. All Rights Reserved.
- * 
+ *
+ * Copyright Ericsson AB 2004-2010. All Rights Reserved.
+ *
  * The contents of this file are subject to the Erlang Public License,
  * Version 1.1, (the "License"); you may not use this file except in
  * compliance with the License. You should have received a copy of the
  * Erlang Public License along with this software. If not, it can be
  * retrieved online at http://www.erlang.org/.
- * 
+ *
  * Software distributed under the License is distributed on an "AS IS"
  * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
  * the License for the specific language governing rights and limitations
  * under the License.
- * 
+ *
  * %CopyrightEnd%
  */
 /* $Id$
@@ -86,7 +86,7 @@ Eterm *fullsweep_nstack(Process *p, Eterm *n_htop)
 		if (is_boxed(gval)) {
 		    Eterm *ptr = boxed_val(gval);
 		    Eterm val = *ptr;
-		    if (IS_MOVED(val)) {
+		    if (IS_MOVED_BOXED(val)) {
 			ASSERT(is_boxed(val));
 			*nsp_i = val;
 		    } else if (in_area(ptr, src, src_size) ||
@@ -96,7 +96,7 @@ Eterm *fullsweep_nstack(Process *p, Eterm *n_htop)
 		} else if (is_list(gval)) {
 		    Eterm *ptr = list_val(gval);
 		    Eterm val = *ptr;
-		    if (is_non_value(val)) {
+		    if (IS_MOVED_CONS(val)) {
 			*nsp_i = ptr[1];
 		    } else if (in_area(ptr, src, src_size) ||
 			       in_area(ptr, oh, oh_size)) {
@@ -193,7 +193,7 @@ void gensweep_nstack(Process *p, Eterm **ptr_old_htop, Eterm **ptr_n_htop)
 		if (is_boxed(gval)) {
 		    Eterm *ptr = boxed_val(gval);
 		    Eterm val = *ptr;
-		    if (IS_MOVED(val)) {
+		    if (IS_MOVED_BOXED(val)) {
 			ASSERT(is_boxed(val));
 			*nsp_i = val;
 		    } else if (in_area(ptr, heap, mature_size)) {
@@ -205,7 +205,7 @@ void gensweep_nstack(Process *p, Eterm **ptr_old_htop, Eterm **ptr_n_htop)
 		} else if (is_list(gval)) {
 		    Eterm *ptr = list_val(gval);
 		    Eterm val = *ptr;
-		    if (is_non_value(val)) {
+		    if (IS_MOVED_CONS(val)) {
 			*nsp_i = ptr[1];
 		    } else if (in_area(ptr, heap, mature_size)) {
 			MOVE_CONS(ptr, val, old_htop, nsp_i);
diff --git a/erts/emulator/test/nif_SUITE.erl b/erts/emulator/test/nif_SUITE.erl
index 161e38c68a..a1f61dad67 100644
--- a/erts/emulator/test/nif_SUITE.erl
+++ b/erts/emulator/test/nif_SUITE.erl
@@ -20,24 +20,39 @@
 -module(nif_SUITE).
 
 %%-define(line_trace,true).
-%%-define(CHECK(Exp,Got), ?line check(Exp,Got,?LINE)).
--define(CHECK(Exp,Got), ?line Exp = Got).
+-define(CHECK(Exp,Got), check(Exp,Got,?LINE)).
+%%-define(CHECK(Exp,Got), ?line Exp = Got).
 
 -include("test_server.hrl").
 
--export([all/1, fin_per_testcase/2, basic/1, reload/1, upgrade/1, heap_frag/1,
+-export([all/1, 
+	 %%init_per_testcase/2, 
+	 fin_per_testcase/2, basic/1, reload/1, upgrade/1, heap_frag/1,
 	 types/1, many_args/1, binaries/1, get_string/1, get_atom/1, api_macros/1,
-	 from_array/1, iolist_as_binary/1, resource/1, resource_takeover/1,
-	 threading/1, neg/1, is_checks/1, get_length/1, make_atom/1, make_string/1]).
+	 from_array/1, iolist_as_binary/1, resource/1, resource_binary/1, resource_takeover/1,
+	 threading/1, send/1, send2/1, send_threaded/1, neg/1, is_checks/1,
+	 get_length/1, make_atom/1, make_string/1]).
 
 -export([many_args_100/100]).
+
+
+%% -export([lib_version/0,call_history/0,hold_nif_mod_priv_data/1,nif_mod_call_history/0,
+%% 	 list_seq/1,type_test/0,tuple_2_list/1,is_identical/2,compare/2,
+%% 	 clone_bin/1,make_sub_bin/3,string_to_bin/2,atom_to_bin/2,macros/1,
+%% 	 tuple_2_list_and_tuple/1,iolist_2_bin/1,get_resource_type/1,alloc_resource/2,
+%% 	 make_resource/1,get_resource/2,release_resource/1,last_resource_dtor_call/0,
+%% 	 make_new_resource/2,make_new_resource_binary/1,send_list_seq/2,send_new_blob/2,
+%% 	 alloc_msgenv/0,clear_msgenv/1,grow_blob/2,send_blob/2,send_blob_thread/3,
+%% 	 join_send_thread/1]).
+
+
 -define(nif_stub,nif_stub_error(?LINE)).
 
 all(suite) ->
     [basic, reload, upgrade, heap_frag, types, many_args, binaries, get_string,
-     get_atom, api_macros, from_array, iolist_as_binary, resource,
-     resource_takeover, threading, neg, is_checks, get_length, make_atom,
-     make_string].
+     get_atom, api_macros, from_array, iolist_as_binary, resource, resource_binary,
+     resource_takeover, threading, send, send2, send_threaded, neg, is_checks,
+     get_length, make_atom, make_string].
 
 %%init_per_testcase(_Case, Config) ->
 %%    ?line Dog = ?t:timetrap(?t:seconds(60*60*24)),
@@ -474,12 +489,51 @@ resource_new_do2(Type) ->
     {{PtrA,BinA}, {ResB,PtrB,BinB}}.
 
 resource_neg(TypeA) ->
+    resource_neg_do(TypeA),
+
+    catch exit(42), % dummy exception to purge saved stacktraces from earlier exception
+    erlang:garbage_collect(),
+    ?line {_,_,2} = last_resource_dtor_call(),
+    ok.
+
+resource_neg_do(TypeA) ->
     TypeB = get_resource_type(1),
-    Aptr = alloc_resource(TypeA, <<"Arnold">>),
-    Bptr = alloc_resource(TypeB, <<"Bobo">>),
-    ?line {'EXIT',{badarg,_}} = (catch get_resource(TypeA, Bptr)),
-    ?line {'EXIT',{badarg,_}} = (catch get_resource(TypeB, Aptr)),
+    ResA = make_new_resource(TypeA, <<"Arnold">>),
+    ResB= make_new_resource(TypeB, <<"Bobo">>),
+    ?line {'EXIT',{badarg,_}} = (catch get_resource(TypeA, ResB)),
+    ?line {'EXIT',{badarg,_}} = (catch get_resource(TypeB, ResA)),
+    ok.
+
+resource_binary(doc) -> ["Test enif_make_resource_binary"];
+resource_binary(suite) -> [];
+resource_binary(Config) when is_list(Config) ->
+    ?line ensure_lib_loaded(Config, 1),
+    ?line {Ptr,Bin} = resource_binary_do(),
+    erlang:garbage_collect(),
+    Last = last_resource_dtor_call(),
+    ?CHECK({Ptr,Bin,1}, Last),
     ok.
+
+resource_binary_do() ->
+    Bin = <<"Hej Hopp i lingonskogen">>,
+    ?line {Ptr,ResBin1} = make_new_resource_binary(Bin),
+    ?line ResBin1 = Bin,          
+    ?line ResInfo = {Ptr,_} = get_resource(binary_resource_type,ResBin1),
+
+    Papa = self(),
+    Forwarder = spawn_link(fun() -> forwarder(Papa) end),
+    io:format("sending to forwarder pid=~p\n",[Forwarder]),  
+    Forwarder ! ResBin1,
+    ResBin2 = receive_any(),
+    ?line ResBin2 = ResBin1,
+    ?line ResInfo = get_resource(binary_resource_type,ResBin2),
+    Forwarder ! terminate,
+    ?line {Forwarder, 1} = receive_any(),
+    erlang:garbage_collect(),
+    ?line ResInfo = get_resource(binary_resource_type,ResBin1),
+    ?line ResInfo = get_resource(binary_resource_type,ResBin2),
+    ResInfo.
+
     
 -define(RT_CREATE,1).
 -define(RT_TAKEOVER,2).
@@ -744,6 +798,124 @@ threading(Config) when is_list(Config) ->
 
     ?line ok = tester:load_nif_lib(Config, "tsd"),
     ?line ok = tester:run().
+
+send(doc) -> ["Test NIF message sending"];
+send(Config) when is_list(Config) ->    
+    ensure_lib_loaded(Config),
+
+    N = 1500,
+    List = lists:seq(1,N),
+    ?line {ok,1} = send_list_seq(N, self),
+    ?line {ok,1} = send_list_seq(N, self()),
+    ?line List = receive_any(),
+    ?line List = receive_any(),
+    Papa = self(),
+    spawn_link(fun() -> ?line {ok,1} = send_list_seq(N, Papa) end),
+    ?line List = receive_any(),
+
+    ?line {ok, 1, BlobS} = send_new_blob(self(), other_term()),
+    ?line BlobR = receive_any(),
+    io:format("Sent ~p\nGot ~p\n", [BlobS, BlobR]),
+    ?line BlobR = BlobS,
+
+    %% send to dead pid
+    {DeadPid, DeadMon} = spawn_monitor(fun() -> void end),
+    ?line {'DOWN', DeadMon, process, DeadPid, normal} = receive_any(),
+    {ok,0} = send_list_seq(7, DeadPid),
+    ok.
+
+send2(doc) -> ["More NIF message sending"];
+send2(Config) when is_list(Config) ->
+    ensure_lib_loaded(Config),
+
+    send2_do1(fun send_blob_dbg/2),
+    ok.
+
+send_threaded(doc) -> ["Send msg from user thread"];
+send_threaded(Config) when is_list(Config) ->
+    case erlang:system_info(smp_support) of
+	true ->
+	    send2_do1(fun(ME,To) -> send_blob_thread_dbg(ME,To,join) end),
+	    send2_do1(fun(ME,To) -> send_blob_thread_and_join(ME,To) end),
+	    ok;
+	false ->
+	    {skipped,"No threaded send on non-SMP"}
+    end.
+
+
+send2_do1(SendBlobF) ->
+    io:format("sending to self=~p\n",[self()]),
+    send2_do2(SendBlobF, self()),
+
+    Papa = self(),
+    Forwarder = spawn_link(fun() -> forwarder(Papa) end),
+    io:format("sending to forwarder pid=~p\n",[Forwarder]),
+    send2_do2(SendBlobF, Forwarder),
+    Forwarder ! terminate,
+    ?line {Forwarder, 4} = receive_any(),
+    ok.
+
+send2_do2(SendBlobF, To) ->   
+    MsgEnv = alloc_msgenv(),
+    repeat(50, fun(_) -> grow_blob(MsgEnv,other_term()) end, []),
+    ?line {ok,1,Blob0} = SendBlobF(MsgEnv, To),
+    ?line Blob1 = receive_any(),
+    ?line Blob1 = Blob0,
+    
+    clear_msgenv(MsgEnv),
+    repeat(50, fun(_) -> grow_blob(MsgEnv,other_term()) end, []),
+    ?line {ok,1,Blob2} = SendBlobF(MsgEnv, To),
+    ?line Blob3 = receive_any(),
+    ?line Blob3 = Blob2,
+
+    clear_msgenv(MsgEnv),
+    repeat(50, fun(_) -> grow_blob(MsgEnv,other_term()) end, []),
+
+    clear_msgenv(MsgEnv),
+    repeat(50, fun(_) -> grow_blob(MsgEnv,other_term()) end, []),
+    ?line {ok,1,Blob4} = SendBlobF(MsgEnv, To),
+    ?line Blob5 = receive_any(),
+    ?line Blob5 = Blob4,
+
+    clear_msgenv(MsgEnv),
+    clear_msgenv(MsgEnv),
+    repeat(50, fun(_) -> grow_blob(MsgEnv,other_term()) end, []),
+    ?line {ok,1,Blob6} = SendBlobF(MsgEnv, To),
+    ?line Blob7 = receive_any(),
+    ?line Blob7 = Blob6,
+
+    ok.
+
+
+send_blob_thread_and_join(MsgEnv, To) ->
+    ?line {ok,Blob} = send_blob_thread_dbg(MsgEnv, To, no_join),
+    ?line {ok,SendRes} = join_send_thread(MsgEnv),
+    {ok,SendRes,Blob}.
+
+send_blob_dbg(MsgEnv, To) ->
+    Ret = send_blob(MsgEnv, To),
+    %%io:format("send_blob to ~p returned ~p\n",[To,Ret]),
+    Ret.
+
+send_blob_thread_dbg(MsgEnv, To, Join) ->
+    Ret = send_blob_thread(MsgEnv, To, Join),
+    %%io:format("send_blob_thread to ~p Join=~p returned ~p\n",[To,Join,Ret]),
+    Ret.
+
+
+forwarder(To) ->
+    forwarder(To, 0).
+forwarder(To, N) ->
+    case receive_any() of
+	terminate ->
+	    To ! {self(), N};
+	Msg ->	    
+	    To ! Msg,	   
+	    forwarder(To, N+1)
+    end.
+
+other_term() ->
+    {fun(X,Y) -> X*Y end, make_ref()}.
     
 neg(doc) -> ["Negative testing of load_nif"];
 neg(Config) when is_list(Config) ->
@@ -848,13 +1020,18 @@ call(Pid,Cmd) ->
 receive_any() ->
     receive M -> M end.	     
 
-%% check(Exp,Got,Line) ->
-%%     case Got of
-%% 	Exp -> Exp;	    
-%% 	_ ->
-%% 	    io:format("CHECK at ~p: Expected ~p but got ~p\n",[Line,Exp,Got]),
-%% 	    Got
-%%     end.
+repeat(0, _, Arg) ->
+    Arg;
+repeat(N, Fun, Arg0) ->
+    repeat(N-1, Fun, Fun(Arg0)).
+
+check(Exp,Got,Line) ->
+    case Got of
+ 	Exp -> Exp;	    
+  	_ ->
+  	    io:format("CHECK at ~p: Expected ~p but got ~p\n",[Line,Exp,Got]),
+ 	    Got
+    end.
 	    
 
 %% The NIFs:
@@ -886,6 +1063,16 @@ check_is(_,_,_,_,_,_,_,_,_,_) -> ?nif_stub.
 length_test(_,_,_,_,_) -> ?nif_stub.
 make_atoms() -> ?nif_stub.
 make_strings() -> ?nif_stub.
+make_new_resource_binary(_) -> ?nif_stub.
+send_list_seq(_,_) -> ?nif_stub.     
+send_new_blob(_,_) -> ?nif_stub.     
+alloc_msgenv() -> ?nif_stub.
+clear_msgenv(_) -> ?nif_stub.
+grow_blob(_,_) -> ?nif_stub.
+send_blob(_,_) -> ?nif_stub.
+send_blob_thread(_,_,_) -> ?nif_stub.
+join_send_thread(_) -> ?nif_stub.
+
 
 nif_stub_error(Line) ->
     exit({nif_not_loaded,module,?MODULE,line,Line}).
diff --git a/erts/emulator/test/nif_SUITE_data/nif_SUITE.c b/erts/emulator/test/nif_SUITE_data/nif_SUITE.c
index 73226a09cb..bacf7845e2 100644
--- a/erts/emulator/test/nif_SUITE_data/nif_SUITE.c
+++ b/erts/emulator/test/nif_SUITE_data/nif_SUITE.c
@@ -28,6 +28,12 @@
 static int static_cntA; /* zero by default */
 static int static_cntB = NIF_SUITE_LIB_VER * 100;
 
+static ERL_NIF_TERM atom_self;
+static ERL_NIF_TERM atom_ok;
+static ERL_NIF_TERM atom_join;
+static ERL_NIF_TERM atom_binary_resource_type;
+
+
 typedef struct
 {
     int ref_cnt;
@@ -38,7 +44,7 @@ typedef struct
 
 void add_call(ErlNifEnv* env, PrivData* data, const char* func_name)
 {
-    CallInfo* call = enif_alloc(env, sizeof(CallInfo)+strlen(func_name));
+    CallInfo* call = enif_alloc(sizeof(CallInfo)+strlen(func_name));
     strcpy(call->func_name, func_name);
     call->lib_ver = NIF_SUITE_LIB_VER;
     call->next = data->call_history;
@@ -49,7 +55,7 @@ void add_call(ErlNifEnv* env, PrivData* data, const char* func_name)
     call->arg_sz = 0;
 }
 
-#define ADD_CALL(FUNC_NAME) add_call(env, enif_get_data(env),FUNC_NAME)
+#define ADD_CALL(FUNC_NAME) add_call(env, enif_priv_data(env),FUNC_NAME)
 
 static void*    resource_dtor_last = NULL;
 static unsigned resource_dtor_last_sz = 0;
@@ -60,15 +66,24 @@ static void resource_dtor(ErlNifEnv* env, void* obj)
 {
     resource_dtor_last = obj;
     resource_dtor_cnt++;
-    resource_dtor_last_sz = enif_sizeof_resource(env, obj);
+    resource_dtor_last_sz = enif_sizeof_resource(obj);
     assert(resource_dtor_last_sz <= sizeof(resource_dtor_last_data));
     memcpy(resource_dtor_last_data, obj, resource_dtor_last_sz);
 }
 
+static ErlNifResourceType* msgenv_resource_type;
+static void msgenv_dtor(ErlNifEnv* env, void* obj);
+
+static ErlNifResourceType* binary_resource_type;
+static void binary_resource_dtor(ErlNifEnv* env, void* obj);
+struct binary_resource {
+    unsigned char* data;
+    unsigned size;
+};
+
 static int load(ErlNifEnv* env, void** priv_data, ERL_NIF_TERM load_info)
 {
-    /*ERL_NIF_TERM head, tail;*/
-    PrivData* data = enif_alloc(env, sizeof(PrivData));
+    PrivData* data = enif_alloc(sizeof(PrivData));
     assert(data != NULL);
     data->ref_cnt = 1;
     data->call_history = NULL;
@@ -76,41 +91,71 @@ static int load(ErlNifEnv* env, void** priv_data, ERL_NIF_TERM load_info)
 
     add_call(env, data, "load");
 
-    /*
-    head = load_info;
-    data->rt_cnt = 0;
-    for (head=load_info; enif_get_list_cell(env,load_info,&head,&tail);
-	  head=tail) {
-	char buf[20];
-	int n = enif_get_string(env,head,buf,sizeof(buf));
-	assert(n > 0);
-	assert(i < sizeof(data->rt_arr)/sizeof(*data->rt_arr));
-	data->rt_arr[data->rt_cnt++].t = enif_create_resource_type(env,buf,resource_dtor,
-								   ERL_NIF_RT_CREATE,NULL);	   
-    }
-    assert(enif_is_empty_list(env,head)); 
-    */
-    data->rt_arr[0].t = enif_open_resource_type(env,"Gold",resource_dtor,
+    data->rt_arr[0].t = enif_open_resource_type(env,NULL,"Gold",resource_dtor,
 						ERL_NIF_RT_CREATE,NULL);
-    data->rt_arr[1].t = enif_open_resource_type(env,"Silver",resource_dtor,
+    data->rt_arr[1].t = enif_open_resource_type(env,NULL,"Silver",resource_dtor,
 						ERL_NIF_RT_CREATE,NULL);
 
+    binary_resource_type =  enif_open_resource_type(env,NULL,"nif_SUITE.binary",
+						    binary_resource_dtor,
+						    ERL_NIF_RT_CREATE, NULL);
+
+    msgenv_resource_type =  enif_open_resource_type(env,NULL,"nif_SUITE.msgenv",
+						    msgenv_dtor,
+						    ERL_NIF_RT_CREATE, NULL);
+
+    atom_self = enif_make_atom(env,"self");
+    atom_ok = enif_make_atom(env,"ok");
+    atom_join = enif_make_atom(env,"join");
+    atom_binary_resource_type = enif_make_atom(env,"binary_resource_type");
+
     *priv_data = data;
     return 0;
 }
 
+static void resource_takeover(ErlNifEnv* env, PrivData* priv)
+{
+    ErlNifResourceFlags tried;
+    ErlNifResourceType* rt;
+    rt = enif_open_resource_type(env, NULL, "Gold", resource_dtor,
+				 ERL_NIF_RT_TAKEOVER, &tried);
+    assert(rt == priv->rt_arr[0].t); 
+    assert(tried == ERL_NIF_RT_TAKEOVER);
+    rt = enif_open_resource_type(env, NULL, "Silver", resource_dtor,
+				 ERL_NIF_RT_TAKEOVER, &tried);
+    assert(rt == priv->rt_arr[1].t); 
+    assert(tried == ERL_NIF_RT_TAKEOVER);
+
+    rt =  enif_open_resource_type(env, NULL, "nif_SUITE.binary", binary_resource_dtor,
+				  ERL_NIF_RT_TAKEOVER, &tried);
+    assert(rt != NULL);
+    assert(tried == ERL_NIF_RT_TAKEOVER);
+    assert(binary_resource_type==NULL || binary_resource_type == rt); 
+    binary_resource_type = rt;
+
+    rt = enif_open_resource_type(env, NULL, "nif_SUITE.msgenv", msgenv_dtor,
+				  ERL_NIF_RT_TAKEOVER, &tried);
+    assert(rt != NULL);
+    assert(tried == ERL_NIF_RT_TAKEOVER);
+    assert(msgenv_resource_type==NULL || msgenv_resource_type == rt); 
+    msgenv_resource_type = rt;
+}
+
 static int reload(ErlNifEnv* env, void** priv_data, ERL_NIF_TERM load_info)
 {
-    add_call(env, *priv_data, "reload");
+    PrivData* priv = (PrivData*) *priv_data;
+    add_call(env, priv, "reload");
+    resource_takeover(env,priv);
     return 0;
 }
 
 static int upgrade(ErlNifEnv* env, void** priv_data, void** old_priv_data, ERL_NIF_TERM load_info)
 {
-    PrivData* data = *old_priv_data;
-    add_call(env, data, "upgrade");
-    data->ref_cnt++;
-    *priv_data = *old_priv_data;    
+    PrivData* priv = (PrivData*) *old_priv_data;
+    add_call(env, priv, "upgrade");
+    priv->ref_cnt++;
+    *priv_data = *old_priv_data;
+    resource_takeover(env,priv);
     return 0;
 }
 
@@ -119,7 +164,10 @@ static void unload(ErlNifEnv* env, void* priv_data)
     PrivData* data = priv_data;
     add_call(env, data, "unload");
     if (--data->ref_cnt == 0) {
-	enif_free(env, priv_data);
+	if (data->nif_mod != NULL) {
+	    NifModPrivData_release(data->nif_mod);
+	}
+	enif_free(priv_data);
     }
 }
 
@@ -149,28 +197,28 @@ static ERL_NIF_TERM make_call_history(ErlNifEnv* env, CallInfo** headp)
 			       enif_make_int(env,call->static_cntB));
 	list = enif_make_list_cell(env, tpl, list);
 	*headp = call->next;
-	enif_free(env,call);
+	enif_free(call);
     }
     return list;
 }
 
 static ERL_NIF_TERM call_history(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
 {
-    PrivData* data = (PrivData*) enif_get_data(env);
+    PrivData* data = (PrivData*) enif_priv_data(env);
 
     return make_call_history(env,&data->call_history);
 }
 
 static ERL_NIF_TERM hold_nif_mod_priv_data(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
 {
-    PrivData* data = (PrivData*) enif_get_data(env);
+    PrivData* data = (PrivData*) enif_priv_data(env);
     unsigned long ptr_as_ulong;
     
     if (!enif_get_ulong(env,argv[0],&ptr_as_ulong)) {
 	return enif_make_badarg(env);
     }
-    if (data->nif_mod != NULL && --(data->nif_mod->ref_cnt) == 0) {
-	enif_free(env,data->nif_mod);
+    if (data->nif_mod != NULL) {
+	NifModPrivData_release(data->nif_mod);
     }
     data->nif_mod = (NifModPrivData*) ptr_as_ulong;    
     return enif_make_int(env,++(data->nif_mod->ref_cnt)); 
@@ -178,7 +226,7 @@ static ERL_NIF_TERM hold_nif_mod_priv_data(ErlNifEnv* env, int argc, const ERL_N
 
 static ERL_NIF_TERM nif_mod_call_history(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
 {
-    PrivData* data = (PrivData*) enif_get_data(env);
+    PrivData* data = (PrivData*) enif_priv_data(env);
     ERL_NIF_TERM ret;
     if (data->nif_mod == NULL) {
 	return enif_make_string(env,"nif_mod pointer is NULL", ERL_NIF_LATIN1);
@@ -354,13 +402,13 @@ static ERL_NIF_TERM type_test(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[
 	}	
     }
 
-    if (!enif_make_existing_atom(env,"nif_SUITE", &atom)
-	|| !enif_is_identical(env,atom,enif_make_atom(env,"nif_SUITE"))) {
+    if (!enif_make_existing_atom(env,"nif_SUITE", &atom, ERL_NIF_LATIN1)
+	|| !enif_is_identical(atom,enif_make_atom(env,"nif_SUITE"))) {
 	fprintf(stderr, "nif_SUITE not an atom?\r\n");
 	goto error;
     }
     for (i=2; i; i--) {
-	if (enif_make_existing_atom(env,"nif_SUITE_pink_unicorn", &atom)) {
+	if (enif_make_existing_atom(env,"nif_SUITE_pink_unicorn", &atom, ERL_NIF_LATIN1)) {
 	    fprintf(stderr, "pink unicorn exist?\r\n");
 	    goto error;
 	}
@@ -368,7 +416,7 @@ static ERL_NIF_TERM type_test(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[
     ref1 = enif_make_ref(env);
     ref2 = enif_make_ref(env);
     if (!enif_is_ref(env,ref1) || !enif_is_ref(env,ref2) 
-	|| enif_is_identical(env,ref1,ref2) || enif_compare(env,ref1,ref2)==0) {
+	|| enif_is_identical(ref1,ref2) || enif_compare(ref1,ref2)==0) {
 	fprintf(stderr, "strange refs?\r\n");
 	goto error;
     }
@@ -398,7 +446,7 @@ static ERL_NIF_TERM is_identical(ErlNifEnv* env, int argc, const ERL_NIF_TERM ar
     if (argc != 2) {
 	return enif_make_badarg(env);
     }
-    return enif_make_atom(env, (enif_is_identical(env,argv[0],argv[1]) ?
+    return enif_make_atom(env, (enif_is_identical(argv[0],argv[1]) ?
 				"true" : "false"));
 }
 
@@ -407,7 +455,7 @@ static ERL_NIF_TERM compare(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
     if (argc != 2) {
 	return enif_make_badarg(env);
     }
-    return enif_make_int(env, enif_compare(env,argv[0],argv[1]));
+    return enif_make_int(env, enif_compare(argv[0],argv[1]));
 }
 
 static ERL_NIF_TERM many_args_100(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
@@ -454,7 +502,7 @@ static ERL_NIF_TERM string_to_bin(ErlNifEnv* env, int argc, const ERL_NIF_TERM a
     unsigned size;
     int n;
     if (!enif_get_int(env,argv[1],(int*)&size) 
-	|| !enif_alloc_binary(env,size,&obin)) {
+	|| !enif_alloc_binary(size,&obin)) {
 	return enif_make_badarg(env);
     }
     n = enif_get_string(env, argv[0], (char*)obin.data, size, ERL_NIF_LATIN1);
@@ -468,10 +516,10 @@ static ERL_NIF_TERM atom_to_bin(ErlNifEnv* env, int argc, const ERL_NIF_TERM arg
     unsigned size;
     int n;
     if (!enif_get_int(env,argv[1],(int*)&size) 
-	|| !enif_alloc_binary(env,size,&obin)) {
+	|| !enif_alloc_binary(size,&obin)) {
 	return enif_make_badarg(env);
     }
-    n = enif_get_atom(env, argv[0], (char*)obin.data, size);
+    n = enif_get_atom(env, argv[0], (char*)obin.data, size, ERL_NIF_LATIN1);
     return enif_make_tuple(env, 2, enif_make_int(env,n),
 			   enif_make_binary(env,&obin));
 }
@@ -552,7 +600,7 @@ static ERL_NIF_TERM last_resource_dtor_call(ErlNifEnv* env, int argc, const ERL_
 
 static ERL_NIF_TERM get_resource_type(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
 {
-    PrivData* data = (PrivData*) enif_get_data(env);
+    PrivData* data = (PrivData*) enif_priv_data(env);
     int ix;
     
     if (!enif_get_int(env, argv[0], &ix) || ix >= 2) {
@@ -568,7 +616,7 @@ static ERL_NIF_TERM alloc_resource(ErlNifEnv* env, int argc, const ERL_NIF_TERM
     union { void* p; long l;} data;
     if (!enif_get_long(env, argv[0], &type.l)
 	|| !enif_inspect_binary(env, argv[1], &data_bin)
-	|| (data.p = enif_alloc_resource(env, type.t, data_bin.size))==NULL) {
+	|| (data.p = enif_alloc_resource(type.t, data_bin.size))==NULL) {
 
 	return enif_make_badarg(env);
     }
@@ -593,28 +641,65 @@ static ERL_NIF_TERM make_new_resource(ErlNifEnv* env, int argc, const ERL_NIF_TE
     ERL_NIF_TERM ret;
     if (!enif_get_long(env, argv[0], &type.l)
 	|| !enif_inspect_binary(env, argv[1], &data_bin)
-	|| (data = enif_alloc_resource(env, type.t, data_bin.size))==NULL) {
+	|| (data = enif_alloc_resource(type.t, data_bin.size))==NULL) {
 
 	return enif_make_badarg(env);
     }
     ret = enif_make_resource(env, data);
     memcpy(data, data_bin.data, data_bin.size);
-    enif_release_resource(env, data);
+    enif_release_resource(data);
     return ret;
 }
 
+static ERL_NIF_TERM make_new_resource_binary(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{
+    ErlNifBinary data_bin;
+    union { struct binary_resource* p; void* vp; long l;} br;
+    void* buf;
+    ERL_NIF_TERM ret;
+    if (!enif_inspect_binary(env, argv[0], &data_bin)
+	|| (br.vp = enif_alloc_resource(binary_resource_type,
+					sizeof(struct binary_resource)))==NULL
+	|| (buf = enif_alloc(data_bin.size)) == NULL) {
+	
+	return enif_make_badarg(env);
+    }    
+    memset(br.vp,0xba,sizeof(struct binary_resource)); /* avoid valgrind warning */
+    br.p->data = buf;
+    br.p->size = data_bin.size;
+    memcpy(br.p->data, data_bin.data, data_bin.size);    
+    ret = enif_make_resource_binary(env, br.vp, br.p->data, br.p->size);    
+    enif_release_resource(br.p);
+    return enif_make_tuple2(env, enif_make_long(env,br.l), ret);
+}
+
+static void binary_resource_dtor(ErlNifEnv* env, void* obj)
+{
+    struct binary_resource* br = (struct binary_resource*) obj;
+    resource_dtor(env,obj);
+    assert(br->data != NULL);
+    enif_free(br->data);
+    br->data = NULL;
+}
+
 static ERL_NIF_TERM get_resource(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
 {
     ErlNifBinary data_bin;
     union { ErlNifResourceType* t; long l; } type;
     union { void* p; long l; } data;
 
-    if (!enif_get_long(env, argv[0], &type.l)
+    type.t = NULL;
+    if (enif_is_identical(argv[0], atom_binary_resource_type)) {
+	type.t = binary_resource_type;
+    }
+    else {
+	enif_get_long(env, argv[0], &type.l);
+    }
+    if (type.t == NULL 
 	|| !enif_get_resource(env, argv[1], type.t, &data.p)) {
 	return enif_make_badarg(env);
     }
-
-    enif_alloc_binary(env, enif_sizeof_resource(env,data.p), &data_bin);    
+    enif_alloc_binary(enif_sizeof_resource(data.p), &data_bin);    
     memcpy(data_bin.data, data.p, data_bin.size);
     return enif_make_tuple2(env, enif_make_long(env,data.l),
 			    enif_make_binary(env, &data_bin));
@@ -626,7 +711,7 @@ static ERL_NIF_TERM release_resource(ErlNifEnv* env, int argc, const ERL_NIF_TER
     if (!enif_get_long(env, argv[0], &data.l)) {
 	return enif_make_badarg(env);
     }
-    enif_release_resource(env, data.p);
+    enif_release_resource(data.p);
     return enif_make_atom(env,"ok");
 }
 
@@ -649,7 +734,7 @@ static ERL_NIF_TERM check_is(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]
     if (!enif_is_atom(env, argv[0])) return enif_make_badarg(env);
     if (!enif_is_binary(env, argv[1])) return enif_make_badarg(env);
     if (!enif_is_ref(env, argv[2])) return enif_make_badarg(env);
-    if (!enif_is_identical(env, argv[3], ok_atom)) return enif_make_badarg(env);
+    if (!enif_is_identical(argv[3], ok_atom)) return enif_make_badarg(env);
     if (!enif_is_fun(env, argv[4])) return enif_make_badarg(env);
     if (!enif_is_pid(env, argv[5])) return enif_make_badarg(env);
     if (!enif_is_port(env, argv[6])) return enif_make_badarg(env);
@@ -672,7 +757,7 @@ static ERL_NIF_TERM length_test(ErlNifEnv* env, int argc, const ERL_NIF_TERM arg
 {
     unsigned len;
 
-    if (!enif_get_atom_length(env, argv[0], &len) || len != 6)
+    if (!enif_get_atom_length(env, argv[0], &len, ERL_NIF_LATIN1) || len != 6)
 	return enif_make_badarg(env);
 
     if (!enif_get_list_length(env, argv[1], &len) || len != 6)
@@ -681,7 +766,7 @@ static ERL_NIF_TERM length_test(ErlNifEnv* env, int argc, const ERL_NIF_TERM arg
     if (!enif_get_list_length(env, argv[2], &len) || len != 0)
 	return enif_make_badarg(env);
 
-    if (enif_get_atom_length(env, argv[3], &len))
+    if (enif_get_atom_length(env, argv[3], &len, ERL_NIF_LATIN1))
 	return enif_make_badarg(env);
 
     if (enif_get_list_length(env, argv[4], &len))
@@ -703,15 +788,15 @@ static ERL_NIF_TERM make_atoms(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv
     arr[2] = enif_make_atom_len(env, an0atom, 7);
     arr[3] = enif_make_atom_len(env, an0atom0, 8);
 
-    if (!enif_make_existing_atom(env, "an0atom", &existingatom0a))
+    if (!enif_make_existing_atom(env, "an0atom", &existingatom0a, ERL_NIF_LATIN1))
 	return enif_make_atom(env, "error");
     arr[4] = existingatom0a;
 
-    if (!enif_make_existing_atom_len(env, an0atom, 7, &existingatom0b))
+    if (!enif_make_existing_atom_len(env, an0atom, 7, &existingatom0b, ERL_NIF_LATIN1))
 	return enif_make_atom(env, "error");
     arr[5] = existingatom0b;
 
-    if (!enif_make_existing_atom_len(env, an0atom0, 8, &existing0atom0))
+    if (!enif_make_existing_atom_len(env, an0atom0, 8, &existing0atom0, ERL_NIF_LATIN1))
 	return enif_make_atom(env, "error");
     arr[6] = existing0atom0;
 
@@ -730,6 +815,442 @@ static ERL_NIF_TERM make_strings(ErlNifEnv* env, int argc, const ERL_NIF_TERM ar
 			    enif_make_string_len(env, a0string, 8, ERL_NIF_LATIN1),
 			    enif_make_string_len(env, a0string0, 9, ERL_NIF_LATIN1));
 }
+static ERL_NIF_TERM send_list_seq(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{
+    ErlNifPid to;
+    ERL_NIF_TERM msg;
+    ErlNifEnv* msg_env;
+    int i, res;
+    
+    if (!enif_get_int(env, argv[0], &i)) {
+	return enif_make_badarg(env);
+    }
+    if (argv[1] == atom_self) {
+	enif_self(env, &to);
+    }
+    else if (!enif_get_local_pid(env, argv[1], &to)) {
+	return enif_make_badarg(env);
+    }
+    msg_env = enif_alloc_env();
+    msg = enif_make_list(msg_env,0);
+    for ( ; i>0 ; i--) {
+	msg = enif_make_list_cell(msg_env, enif_make_int(msg_env, i), msg);
+    }
+    res = enif_send(env, &to, msg_env, msg);
+    enif_free_env(msg_env);
+    return enif_make_tuple2(env, atom_ok, enif_make_int(env,res));
+}
+
+static void fill(void* dst, unsigned bytes, int seed)
+{
+    unsigned char* ptr = dst;
+    int i;
+    for (i=bytes; i>0; i--) {
+	*ptr++ = seed;
+	seed += 7;
+    }
+}
+
+#define MAKE_TERM_REUSE_LEN 16
+struct make_term_info
+{
+    ErlNifEnv* caller_env;
+    ErlNifEnv* dst_env;
+    ERL_NIF_TERM reuse[MAKE_TERM_REUSE_LEN];
+    unsigned reuse_push;
+    unsigned reuse_pull;
+    ErlNifResourceType* resource_type;
+    ERL_NIF_TERM other_term;
+    ERL_NIF_TERM blob;
+    ErlNifPid to_pid;
+    ErlNifTid tid;
+    ErlNifCond* cond;
+    ErlNifMutex* mtx;
+    int send_it;
+    int send_res;
+    unsigned n;
+};
+
+
+static void push_term(struct make_term_info* mti, ERL_NIF_TERM term)
+{
+    unsigned ix = (mti->reuse_push++) % MAKE_TERM_REUSE_LEN; 
+    mti->reuse[ix] = term;
+    //enif_fprintf(stderr, "push at %u: %T\r\n", ix, term);
+}
+static ERL_NIF_TERM pull_term(struct make_term_info* mti)
+{
+    unsigned ix;
+    if (mti->reuse_pull >= mti->reuse_push &&
+	mti->reuse_push < MAKE_TERM_REUSE_LEN) {
+	mti->reuse_pull = 0;
+	if (mti->reuse_push == 0) {
+	    mti->reuse[0] = enif_make_list(mti->dst_env, 0);
+	}
+    }
+    ix = (mti->reuse_pull++) % MAKE_TERM_REUSE_LEN;
+    //enif_fprintf(stderr, "pull from %u: %T\r\n", ix, mti->reuse[ix]);
+    return mti->reuse[ix];
+}
+
+static int make_term_n(struct make_term_info* mti, int n, ERL_NIF_TERM* res);
+
+static ERL_NIF_TERM make_term_binary(struct make_term_info* mti, int n)
+{	
+    ErlNifBinary bin;
+    enif_alloc_binary(100, &bin);
+    fill(bin.data, bin.size, n);
+    return enif_make_binary(mti->dst_env, &bin);
+}
+
+static ERL_NIF_TERM make_term_int(struct make_term_info* mti, int n)
+{
+    int i;
+    fill(&i, sizeof(i), n);
+    return enif_make_int(mti->dst_env, i);
+}
+
+static ERL_NIF_TERM make_term_ulong(struct make_term_info* mti, int n)
+{
+    unsigned long ul;
+    fill(&ul, sizeof(ul), n);
+    return enif_make_ulong(mti->dst_env, ul);
+}
+
+static ERL_NIF_TERM make_term_double(struct make_term_info* mti, int n)
+{
+    double d = 3.141592;
+    return enif_make_double(mti->dst_env, d);    	
+}
+static ERL_NIF_TERM make_term_atom(struct make_term_info* mti, int n)
+{
+    return enif_make_atom(mti->dst_env, "make_term_n");    
+} 
+static ERL_NIF_TERM make_term_existing_atom(struct make_term_info* mti, int n)
+{	
+    ERL_NIF_TERM res;
+    int exist = enif_make_existing_atom(mti->dst_env, "nif_SUITE", &res,
+					ERL_NIF_LATIN1);
+    assert(exist);
+    return res;
+}
+static ERL_NIF_TERM make_term_string(struct make_term_info* mti, int n)
+{
+    return enif_make_string(mti->dst_env, "Hello!", ERL_NIF_LATIN1);
+}
+static ERL_NIF_TERM make_term_ref(struct make_term_info* mti, int n)
+{
+    return enif_make_ref(mti->dst_env);
+}
+static ERL_NIF_TERM make_term_sub_binary(struct make_term_info* mti, int n)
+{
+    ERL_NIF_TERM orig;
+    unsigned char* ptr = enif_make_new_binary(mti->dst_env, 10, &orig);
+    fill(ptr, 10, n);
+    return enif_make_sub_binary(mti->dst_env, orig, 3, 5);	
+}
+static ERL_NIF_TERM make_term_uint(struct make_term_info* mti, int n)
+{
+    unsigned int ui;
+    fill(&ui, sizeof(ui), n);
+    return enif_make_uint(mti->dst_env, ui);	       
+}
+static ERL_NIF_TERM make_term_long(struct make_term_info* mti, int n)
+{
+    long l;
+    fill(&l, sizeof(l), n);
+    return enif_make_long(mti->dst_env, l);
+}
+static ERL_NIF_TERM make_term_tuple0(struct make_term_info* mti, int n)
+{
+    return enif_make_tuple(mti->dst_env, 0);
+}
+static ERL_NIF_TERM make_term_list0(struct make_term_info* mti, int n)
+{
+    return enif_make_list(mti->dst_env, 0);
+}
+static ERL_NIF_TERM make_term_resource(struct make_term_info* mti, int n)
+{
+    void* resource = enif_alloc_resource(mti->resource_type, 10);
+    fill(resource, 10, n); 
+    return enif_make_resource(mti->dst_env, resource);
+}
+static ERL_NIF_TERM make_term_new_binary(struct make_term_info* mti, int n)
+{
+    ERL_NIF_TERM res;
+    unsigned char* ptr = enif_make_new_binary(mti->dst_env,20,&res);
+    fill(ptr, 20, n);	
+    return res;
+}
+static ERL_NIF_TERM make_term_caller_pid(struct make_term_info* mti, int n)
+{
+    ErlNifPid pid;    
+    return enif_make_pid(mti->dst_env, enif_self(mti->caller_env, &pid));    		
+}	
+
+static ERL_NIF_TERM make_term_tuple(struct make_term_info* mti, int n)
+{
+    ERL_NIF_TERM t[3];
+    t[0] = pull_term(mti);
+    t[1] = pull_term(mti);
+    t[2] = pull_term(mti);
+    return enif_make_tuple3(mti->dst_env, t[0], t[1], t[2]);	      
+}
+static ERL_NIF_TERM make_term_list(struct make_term_info* mti, int n)
+{
+    ERL_NIF_TERM t[3];
+    t[0] = pull_term(mti);
+    t[1] = pull_term(mti);
+    t[2] = pull_term(mti);
+    return enif_make_list3(mti->dst_env, t[0], t[1], t[2]);    
+}
+static ERL_NIF_TERM make_term_list_cell(struct make_term_info* mti, int n)
+{
+    ERL_NIF_TERM t[2];
+    t[0] = pull_term(mti);
+    t[1] = pull_term(mti);
+    return enif_make_list_cell(mti->dst_env, t[0], t[1]);
+}
+static ERL_NIF_TERM make_term_tuple_from_array(struct make_term_info* mti, int n)
+{
+    ERL_NIF_TERM t[3];
+    t[0] = pull_term(mti);
+    t[1] = pull_term(mti);
+    t[2] = pull_term(mti);
+    return enif_make_tuple_from_array(mti->dst_env, t, 3);	
+}
+static ERL_NIF_TERM make_term_list_from_array(struct make_term_info* mti, int n)
+{
+    ERL_NIF_TERM t[3];
+    t[0] = pull_term(mti);
+    t[1] = pull_term(mti);
+    t[2] = pull_term(mti);
+    return enif_make_list_from_array(mti->dst_env, t, 3);    
+}
+static ERL_NIF_TERM make_term_garbage(struct make_term_info* mti, int n)
+{
+    (void) enif_make_string(mti->dst_env, "garbage string", ERL_NIF_LATIN1);
+    return pull_term(mti);
+}
+static ERL_NIF_TERM make_term_copy(struct make_term_info* mti, int n)
+{
+    return enif_make_copy(mti->dst_env, mti->other_term);
+}
+static int make_term_n(struct make_term_info* mti, int n, ERL_NIF_TERM* res)
+{
+    typedef ERL_NIF_TERM Make_term_Func(struct make_term_info*, int);
+    static Make_term_Func* funcs[] = {
+	make_term_binary,
+	make_term_int,
+	make_term_ulong,
+	make_term_double,
+	make_term_atom,
+	make_term_existing_atom,
+	make_term_string,
+	//make_term_ref,
+	make_term_sub_binary,
+	make_term_uint,
+	make_term_long,
+	make_term_tuple0,
+	make_term_list0,
+	make_term_resource,
+	make_term_new_binary,
+	make_term_caller_pid,
+	make_term_tuple,
+	make_term_list,
+	make_term_list_cell,
+	make_term_tuple_from_array,
+	make_term_list_from_array,
+	make_term_garbage,
+	make_term_copy
+    };
+    if (n < sizeof(funcs)/sizeof(*funcs)) {
+	*res = funcs[n](mti, n);
+	push_term(mti, *res);
+	return 1;
+    }
+    return 0;
+}
+
+static ERL_NIF_TERM make_blob(ErlNifEnv* caller_env, ErlNifEnv* dst_env,
+			      ERL_NIF_TERM other_term)
+{
+    PrivData* priv = (PrivData*) enif_priv_data(caller_env);
+    ERL_NIF_TERM term, list;
+    int n = 0;
+    struct make_term_info mti;
+    mti.caller_env = caller_env;
+    mti.dst_env = dst_env;
+    mti.reuse_push = 0;
+    mti.reuse_pull = 0;
+    mti.resource_type = priv->rt_arr[0].t;
+    mti.other_term = other_term;
+
+    list = enif_make_list(dst_env, 0); 
+    while (make_term_n(&mti, n++, &term)) {
+	list = enif_make_list_cell(dst_env, term, list);
+    }
+    return list;
+}
+
+static ERL_NIF_TERM send_new_blob(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{
+    ErlNifPid to;
+    ERL_NIF_TERM msg, copy;
+    ErlNifEnv* msg_env;
+    int res;
+    
+    if (!enif_get_local_pid(env, argv[0], &to)) {
+	return enif_make_badarg(env);
+    }
+    msg_env = enif_alloc_env();
+    msg = make_blob(env,msg_env, argv[1]);
+    copy = make_blob(env,env, argv[1]);
+    res = enif_send(env, &to, msg_env, msg);
+    enif_free_env(msg_env);
+    return enif_make_tuple3(env, atom_ok, enif_make_int(env,res), copy);
+}
+
+static ERL_NIF_TERM alloc_msgenv(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{
+    PrivData* priv = (PrivData*) enif_priv_data(env);
+    struct make_term_info* mti;
+    ERL_NIF_TERM ret;
+
+    mti = (struct make_term_info*) enif_alloc_resource(msgenv_resource_type,
+						       sizeof(*mti));
+    mti->caller_env = NULL;
+    mti->dst_env = enif_alloc_env();
+    mti->reuse_push = 0;
+    mti->reuse_pull = 0;
+    mti->resource_type = priv->rt_arr[0].t;
+    mti->other_term = enif_make_list(mti->dst_env, 0);
+    mti->blob = enif_make_list(mti->dst_env, 0);
+    mti->mtx = enif_mutex_create("nif_SUITE:mtx");
+    mti->cond = enif_cond_create("nif_SUITE:cond");
+    mti->send_res = 0xcafebabe;
+    mti->n = 0;
+    ret = enif_make_resource(env, mti);
+    enif_release_resource(mti);
+    return ret;
+}
+
+static void msgenv_dtor(ErlNifEnv* env, void* obj)
+{
+    struct make_term_info* mti = (struct make_term_info*) obj;
+    if (mti->dst_env != NULL) {
+	enif_free_env(mti->dst_env);
+    }
+    enif_mutex_destroy(mti->mtx);
+    enif_cond_destroy(mti->cond);
+}
+
+static ERL_NIF_TERM clear_msgenv(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{
+    union {
+	void* vp;
+	struct make_term_info* p;
+    }mti;
+    if (!enif_get_resource(env, argv[0], msgenv_resource_type, &mti.vp)) {
+	return enif_make_badarg(env);
+    }
+    enif_clear_env(mti.p->dst_env);
+    mti.p->reuse_pull = 0;
+    mti.p->reuse_push = 0;
+    mti.p->blob = enif_make_list(mti.p->dst_env, 0);
+    return atom_ok;
+}
+
+static ERL_NIF_TERM grow_blob(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{
+    union { void* vp; struct make_term_info* p; }mti;
+    ERL_NIF_TERM term;
+    if (!enif_get_resource(env, argv[0], msgenv_resource_type, &mti.vp)) {
+	return enif_make_badarg(env);
+    }
+    mti.p->caller_env = env;
+    mti.p->other_term = argv[1];
+    while (!make_term_n(mti.p, mti.p->n++, &term)) {
+	mti.p->n = 0;
+    }
+    mti.p->blob = enif_make_list_cell(mti.p->dst_env, term, mti.p->blob);
+    return atom_ok;
+}
+
+static ERL_NIF_TERM send_blob(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{
+    union { void* vp; struct make_term_info* p; }mti;
+    ErlNifPid to;
+    ERL_NIF_TERM copy;
+    int res;
+    if (!enif_get_resource(env, argv[0], msgenv_resource_type, &mti.vp)
+	|| !enif_get_local_pid(env, argv[1], &to)) {
+	return enif_make_badarg(env);
+    }
+    copy = enif_make_copy(env, mti.p->blob);
+    res = enif_send(env, &to, mti.p->dst_env, mti.p->blob);
+    return enif_make_tuple3(env, atom_ok, enif_make_int(env,res), copy);
+}
+
+void* threaded_sender(void *arg)
+{
+
+    union { void* vp; struct make_term_info* p; }mti;
+    mti.vp = arg;
+
+    enif_mutex_lock(mti.p->mtx);
+    while (!mti.p->send_it) {
+	enif_cond_wait(mti.p->cond, mti.p->mtx);
+    }
+    mti.p->send_it = 0;
+    enif_mutex_unlock(mti.p->mtx);
+    mti.p->send_res = enif_send(NULL, &mti.p->to_pid, mti.p->dst_env, mti.p->blob);
+    return NULL;
+}
+
+static ERL_NIF_TERM send_blob_thread(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{
+    union { void* vp; struct make_term_info* p; }mti;
+    ERL_NIF_TERM copy;
+    if (!enif_get_resource(env, argv[0], msgenv_resource_type, &mti.vp)
+	|| !enif_get_local_pid(env,argv[1], &mti.p->to_pid)) {
+	return enif_make_badarg(env);
+    }
+    copy = enif_make_copy(env, mti.p->blob);
+
+    mti.p->send_it = enif_is_identical(argv[2],atom_join);
+    if (enif_thread_create("nif_SUITE:send_from_thread", &mti.p->tid,
+			   threaded_sender, mti.p, NULL) != 0) {
+	return enif_make_badarg(env);
+    }
+    if (enif_is_identical(argv[2],atom_join)) {
+	int err = enif_thread_join(mti.p->tid, NULL);
+	assert(err == 0);
+	return enif_make_tuple3(env, atom_ok, enif_make_int(env, mti.p->send_res), copy);
+    }
+    else {
+	enif_keep_resource(mti.vp);
+	return enif_make_tuple2(env, atom_ok, copy);
+    }
+}
+
+static ERL_NIF_TERM join_send_thread(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{
+    union { void* vp; struct make_term_info* p; }mti;
+    int err;
+    if (!enif_get_resource(env, argv[0], msgenv_resource_type, &mti.vp)) {
+	return enif_make_badarg(env);
+    }
+    enif_mutex_lock(mti.p->mtx);
+    mti.p->send_it = 1;
+    enif_cond_signal(mti.p->cond);
+    enif_mutex_unlock(mti.p->mtx);
+    err = enif_thread_join(mti.p->tid, NULL);
+    assert(err == 0);
+    enif_release_resource(mti.vp);
+    return enif_make_tuple2(env, atom_ok, enif_make_int(env, mti.p->send_res));    
+}
+
 
 static ErlNifFunc nif_funcs[] =
 {
@@ -760,8 +1281,17 @@ static ErlNifFunc nif_funcs[] =
     {"check_is", 10, check_is},
     {"length_test", 5, length_test},
     {"make_atoms", 0, make_atoms},
-    {"make_strings", 0, make_strings}
-
+    {"make_strings", 0, make_strings},
+    {"make_new_resource", 2, make_new_resource},
+    {"make_new_resource_binary", 1, make_new_resource_binary},
+    {"send_list_seq", 2, send_list_seq},
+    {"send_new_blob", 2, send_new_blob},
+    {"alloc_msgenv", 0, alloc_msgenv},
+    {"clear_msgenv", 1, clear_msgenv},
+    {"grow_blob", 2, grow_blob},
+    {"send_blob", 2, send_blob},
+    {"send_blob_thread", 3, send_blob_thread},
+    {"join_send_thread", 1, join_send_thread}
 };
 
 ERL_NIF_INIT(nif_SUITE,nif_funcs,load,reload,upgrade,unload)
diff --git a/erts/emulator/test/nif_SUITE_data/nif_mod.c b/erts/emulator/test/nif_SUITE_data/nif_mod.c
index 75df9d56d5..e32d10057c 100644
--- a/erts/emulator/test/nif_SUITE_data/nif_mod.c
+++ b/erts/emulator/test/nif_SUITE_data/nif_mod.c
@@ -42,6 +42,11 @@ static ERL_NIF_TERM am_resource_type;
 static ERL_NIF_TERM am_resource_dtor_A;
 static ERL_NIF_TERM am_resource_dtor_B;
 
+static NifModPrivData* priv_data(ErlNifEnv* env)
+{
+    return (NifModPrivData*) enif_priv_data(env);
+}
+
 static void init(ErlNifEnv* env)
 {
     am_true = enif_make_atom(env, "true");
@@ -54,7 +59,7 @@ static void init(ErlNifEnv* env)
 static void add_call_with_arg(ErlNifEnv* env, NifModPrivData* data, const char* func_name,
 			      const char* arg, int arg_sz)
 {
-    CallInfo* call = enif_alloc(env, sizeof(CallInfo)+strlen(func_name) + arg_sz);
+    CallInfo* call = (CallInfo*)enif_alloc(sizeof(CallInfo)+strlen(func_name) + arg_sz);
     strcpy(call->func_name, func_name);
     call->lib_ver = NIF_LIB_VER;
     call->static_cntA = ++static_cntA;
@@ -78,7 +83,7 @@ static void add_call(ErlNifEnv* env, NifModPrivData* data,const char* func_name)
     add_call_with_arg(env, data, func_name, NULL, 0);
 }
 
-#define ADD_CALL(FUNC_NAME) add_call(env, enif_priv_data(env),FUNC_NAME)
+#define ADD_CALL(FUNC_NAME) add_call(env, priv_data(env),FUNC_NAME)
 
 #define STRINGIFY_(X) #X
 #define STRINGIFY(X) STRINGIFY_(X)
@@ -87,56 +92,56 @@ static void resource_dtor_A(ErlNifEnv* env, void* a)
 {
     const char dtor_name[] = "resource_dtor_A_v"  STRINGIFY(NIF_LIB_VER); 
 
-    add_call_with_arg(env, enif_priv_data(env), dtor_name,
-		      a, enif_sizeof_resource(env, a));
+    add_call_with_arg(env, priv_data(env), dtor_name, (const char*)a,
+		      enif_sizeof_resource(a));
 }
 
 static void resource_dtor_B(ErlNifEnv* env, void* a)
 {
-    const char dtor_name[] = "resource_dtor_B_v"  STRINGIFY(NIF_LIB_VER); 
+    const char dtor_name[] = "resource_dtor_B_v"  STRINGIFY(NIF_LIB_VER);
 
-    add_call_with_arg(env, enif_priv_data(env), dtor_name,
-		      a, enif_sizeof_resource(env, a));
+    add_call_with_arg(env, priv_data(env), dtor_name, (const char*)a,
+		      enif_sizeof_resource(a));
 }
 
 /* {resource_type, Ix|null, ErlNifResourceFlags in, "TypeName", dtor(A|B|null), ErlNifResourceFlags out}*/
 static void open_resource_type(ErlNifEnv* env, ERL_NIF_TERM op_tpl)
 {
-    NifModPrivData* data = enif_priv_data(env);
+    NifModPrivData* data = priv_data(env);
     const ERL_NIF_TERM* arr;
     int arity;
     char rt_name[30];
-    union { enum ErlNifResourceFlags e; int i; } flags, exp_res, got_res;
+    union { ErlNifResourceFlags e; int i; } flags, exp_res, got_res;
     unsigned ix;
     ErlNifResourceDtor* dtor;
     ErlNifResourceType* got_ptr;
 
     CHECK(enif_get_tuple(env, op_tpl, &arity, &arr));
     CHECK(arity == 6);
-    CHECK(enif_is_identical(env, arr[0], am_resource_type));
+    CHECK(enif_is_identical(arr[0], am_resource_type));
     CHECK(enif_get_int(env, arr[2], &flags.i));
     CHECK(enif_get_string(env, arr[3], rt_name, sizeof(rt_name), ERL_NIF_LATIN1) > 0);
     CHECK(enif_get_int(env, arr[5], &exp_res.i));
 	
-    if (enif_is_identical(env, arr[4], am_null)) {
+    if (enif_is_identical(arr[4], am_null)) {
 	dtor = NULL;
     }
-    else if (enif_is_identical(env, arr[4], am_resource_dtor_A)) {
+    else if (enif_is_identical(arr[4], am_resource_dtor_A)) {
 	dtor = resource_dtor_A;
     }
     else {
-	CHECK(enif_is_identical(env, arr[4], am_resource_dtor_B));
+	CHECK(enif_is_identical(arr[4], am_resource_dtor_B));
 	dtor = resource_dtor_B;
     }
 
-    got_ptr = enif_open_resource_type(env, rt_name, dtor,
+    got_ptr = enif_open_resource_type(env, NULL, rt_name, dtor,
 				      flags.e, &got_res.e);
 
     if (enif_get_uint(env, arr[1], &ix) && ix < RT_MAX && got_ptr != NULL) {
 	data->rt_arr[ix] = got_ptr;
     }
     else {
-	CHECK(enif_is_identical(env, arr[1], am_null));
+	CHECK(enif_is_identical(arr[1], am_null));
 	CHECK(got_ptr == NULL);
     }
     CHECK(got_res.e == exp_res.e);
@@ -144,7 +149,7 @@ static void open_resource_type(ErlNifEnv* env, ERL_NIF_TERM op_tpl)
 
 static void do_load_info(ErlNifEnv* env, ERL_NIF_TERM load_info)
 {
-    NifModPrivData* data = enif_priv_data(env);
+    NifModPrivData* data = priv_data(env);
     ERL_NIF_TERM head, tail;
     unsigned ix;
     for (ix=0; ix<RT_MAX; ix++) {
@@ -158,17 +163,18 @@ static void do_load_info(ErlNifEnv* env, ERL_NIF_TERM load_info)
     CHECK(enif_is_empty_list(env, head));
 }
 
-static int load(ErlNifEnv* env, void** priv_data, ERL_NIF_TERM load_info)
+static int load(ErlNifEnv* env, void** priv, ERL_NIF_TERM load_info)
 {
     NifModPrivData* data;
 
     init(env);
-    data = enif_alloc(env, sizeof(NifModPrivData));
+    data = (NifModPrivData*) enif_alloc(sizeof(NifModPrivData));
     CHECK(data != NULL);
-    *priv_data = data;
+    *priv = data;
     data->mtx = enif_mutex_create("nif_mod_priv_data"); 
     data->ref_cnt = 1;
     data->call_history = NULL;
+
     add_call(env, data, "load");
 
     do_load_info(env, load_info);
@@ -176,39 +182,35 @@ static int load(ErlNifEnv* env, void** priv_data, ERL_NIF_TERM load_info)
     return 0;
 }
 
-static int reload(ErlNifEnv* env, void** priv_data, ERL_NIF_TERM load_info)
+static int reload(ErlNifEnv* env, void** priv, ERL_NIF_TERM load_info)
 {
+    NifModPrivData* data = (NifModPrivData*) *priv;
     init(env);
-    add_call(env, *priv_data, "reload");
+    add_call(env, data, "reload");
     
     do_load_info(env, load_info);
     return 0;
 }
 
-static int upgrade(ErlNifEnv* env, void** priv_data, void** old_priv_data, ERL_NIF_TERM load_info)
+static int upgrade(ErlNifEnv* env, void** priv, void** old_priv_data, ERL_NIF_TERM load_info)
 {
-    NifModPrivData* data = *old_priv_data;
+    NifModPrivData* data = (NifModPrivData*) *old_priv_data;
     init(env);
     add_call(env, data, "upgrade");
     data->ref_cnt++;
 
-    *priv_data = *old_priv_data;    
+    *priv = *old_priv_data;    
     do_load_info(env, load_info);
     
     return 0;
 }
 
-static void unload(ErlNifEnv* env, void* priv_data)
+static void unload(ErlNifEnv* env, void* priv)
 {
-    NifModPrivData* data = priv_data;
+    NifModPrivData* data = (NifModPrivData*) priv;
+    int is_last;
     add_call(env, data, "unload");
-    enif_mutex_lock(data->mtx);
-    if (--data->ref_cnt == 0) {
-	enif_mutex_unlock(data->mtx);
-	enif_mutex_destroy(data->mtx);
-	enif_free(env, data);
-    }
-    enif_mutex_unlock(data->mtx);
+    NifModPrivData_release(data);
 }
 
 static ERL_NIF_TERM lib_version(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
@@ -220,12 +222,12 @@ static ERL_NIF_TERM lib_version(ErlNifEnv* env, int argc, const ERL_NIF_TERM arg
 static ERL_NIF_TERM get_priv_data_ptr(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
 {
     ADD_CALL("get_priv_data_ptr");
-    return enif_make_ulong(env, (unsigned long)enif_priv_data(env));
+    return enif_make_ulong(env, (unsigned long)priv_data(env));
 }
 
 static ERL_NIF_TERM make_new_resource(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
 {
-    NifModPrivData* data = (NifModPrivData*) enif_priv_data(env);
+    NifModPrivData* data = priv_data(env);
     ErlNifBinary ibin;
     char* a;
     ERL_NIF_TERM ret;
@@ -234,22 +236,22 @@ static ERL_NIF_TERM make_new_resource(ErlNifEnv* env, int argc, const ERL_NIF_TE
 	|| !enif_inspect_binary(env, argv[1], &ibin)) {
 	return enif_make_badarg(env);
     }
-    a = enif_alloc_resource(env, data->rt_arr[ix], ibin.size);
+    a = (char*) enif_alloc_resource(data->rt_arr[ix], ibin.size);
     memcpy(a, ibin.data, ibin.size);
     ret = enif_make_resource(env, a);
-    enif_release_resource(env, a);
+    enif_release_resource(a);
     return ret;
 }
 
 static ERL_NIF_TERM get_resource(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
 {
-    NifModPrivData* data = (NifModPrivData*) enif_priv_data(env);
+    NifModPrivData* data = priv_data(env);
     ErlNifBinary obin;
     unsigned ix;
     void* a;
     if (!enif_get_uint(env, argv[0], &ix) || ix >= RT_MAX 
 	|| !enif_get_resource(env, argv[1], data->rt_arr[ix], &a)
-	|| !enif_alloc_binary(env, enif_sizeof_resource(env, a), &obin)) { 
+	|| !enif_alloc_binary(enif_sizeof_resource(a), &obin)) { 
 	return enif_make_badarg(env);
     }
     memcpy(obin.data, a, obin.size);
diff --git a/erts/emulator/test/nif_SUITE_data/nif_mod.h b/erts/emulator/test/nif_SUITE_data/nif_mod.h
index 0eaf91d6e1..cd0ecf4b54 100644
--- a/erts/emulator/test/nif_SUITE_data/nif_mod.h
+++ b/erts/emulator/test/nif_SUITE_data/nif_mod.h
@@ -20,3 +20,15 @@ typedef struct
     ErlNifResourceType* rt_arr[RT_MAX];
 }NifModPrivData;
 
+#define NifModPrivData_release(NMPD) \
+    do { \
+	int is_last; \
+	enif_mutex_lock((NMPD)->mtx); \
+	is_last = (--(NMPD)->ref_cnt == 0); \
+        enif_mutex_unlock((NMPD)->mtx); \
+        if (is_last) { \
+	    enif_mutex_destroy((NMPD)->mtx); \
+	    enif_free((NMPD)); \
+        } \
+    }while (0)
+
diff --git a/lib/crypto/c_src/crypto.c b/lib/crypto/c_src/crypto.c
index a71df1d7fd..bb639054a6 100644
--- a/lib/crypto/c_src/crypto.c
+++ b/lib/crypto/c_src/crypto.c
@@ -264,15 +264,15 @@ static int is_ok_load_info(ErlNifEnv* env, ERL_NIF_TERM load_info)
 }
 static void* crypto_alloc(size_t size)
 {   
-    return enif_alloc(NULL, size);
+    return enif_alloc(size);
 }
 static void* crypto_realloc(void* ptr, size_t size)
 {
-    return enif_realloc(NULL, ptr, size);
+    return enif_realloc(ptr, size);
 }   
 static void crypto_free(void* ptr)
 {   
-    enif_free(NULL, ptr); 
+    enif_free(ptr); 
 }
 
 static int load(ErlNifEnv* env, void** priv_data, ERL_NIF_TERM load_info)
@@ -289,7 +289,7 @@ static int load(ErlNifEnv* env, void** priv_data, ERL_NIF_TERM load_info)
 
     if (sys_info.scheduler_threads > 1) {
 	int i;
-	lock_vec = enif_alloc(env,CRYPTO_num_locks()*sizeof(*lock_vec));
+	lock_vec = enif_alloc(CRYPTO_num_locks()*sizeof(*lock_vec));
 	if (lock_vec==NULL) return -1;
 	memset(lock_vec,0,CRYPTO_num_locks()*sizeof(*lock_vec));
 
@@ -371,7 +371,7 @@ static void unload(ErlNifEnv* env, void* priv_data)
 		    enif_rwlock_destroy(lock_vec[i]);
 		}
 	    }
-	    enif_free(env,lock_vec);
+	    enif_free(lock_vec);
 	}
     }
     /*else NIF library still used by other (new) module code */
@@ -994,7 +994,7 @@ static ERL_NIF_TERM rsa_sign_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM ar
 	RSA_free(rsa);
 	return enif_make_badarg(env);
     }
-    enif_alloc_binary(env, RSA_size(rsa), &ret_bin);
+    enif_alloc_binary(RSA_size(rsa), &ret_bin);
     if (is_sha) {
 	SHA1(data_bin.data+4, data_bin.size-4, hmacbuf);
 	ERL_VALGRIND_ASSERT_MEM_DEFINED(hmacbuf, SHA_DIGEST_LENGTH);
@@ -1011,13 +1011,13 @@ static ERL_NIF_TERM rsa_sign_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM ar
     if (i) {
 	ERL_VALGRIND_MAKE_MEM_DEFINED(ret_bin.data, rsa_s_len);
 	if (rsa_s_len != data_bin.size) {
-	    enif_realloc_binary(env, &ret_bin, rsa_s_len);
+	    enif_realloc_binary(&ret_bin, rsa_s_len);
 	    ERL_VALGRIND_ASSERT_MEM_DEFINED(ret_bin.data, rsa_s_len);
 	}
 	return enif_make_binary(env,&ret_bin);
     }
     else {
-	enif_release_binary(env, &ret_bin);
+	enif_release_binary(&ret_bin);
 	return atom_error;
     }
 }
@@ -1049,13 +1049,13 @@ static ERL_NIF_TERM dss_sign_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM ar
 
     SHA1(data_bin.data+4, data_bin.size-4, hmacbuf);
 
-    enif_alloc_binary(env, DSA_size(dsa), &ret_bin);
+    enif_alloc_binary(DSA_size(dsa), &ret_bin);
     i =  DSA_sign(NID_sha1, hmacbuf, SHA_DIGEST_LENGTH,
 		  ret_bin.data, &dsa_s_len, dsa);
     DSA_free(dsa);
     if (i) {
 	if (dsa_s_len != ret_bin.size) {
-	    enif_realloc_binary(env, &ret_bin, dsa_s_len);
+	    enif_realloc_binary(&ret_bin, dsa_s_len);
 	}
 	return enif_make_binary(env, &ret_bin);
     }
@@ -1100,7 +1100,7 @@ static ERL_NIF_TERM rsa_public_crypt(ErlNifEnv* env, int argc, const ERL_NIF_TER
 	return enif_make_badarg(env);
     }
 
-    enif_alloc_binary(env, RSA_size(rsa), &ret_bin); 
+    enif_alloc_binary(RSA_size(rsa), &ret_bin); 
 
     if (argv[3] == atom_true) {
 	ERL_VALGRIND_ASSERT_MEM_DEFINED(buf+i,data_len);
@@ -1115,7 +1115,7 @@ static ERL_NIF_TERM rsa_public_crypt(ErlNifEnv* env, int argc, const ERL_NIF_TER
 			       ret_bin.data, rsa, padding);    
 	if (i > 0) {
 	    ERL_VALGRIND_MAKE_MEM_DEFINED(ret_bin.data, i);
-	    enif_realloc_binary(env, &ret_bin, i);
+	    enif_realloc_binary(&ret_bin, i);
 	}
     }
     RSA_free(rsa);
@@ -1148,7 +1148,7 @@ static ERL_NIF_TERM rsa_private_crypt(ErlNifEnv* env, int argc, const ERL_NIF_TE
 	return enif_make_badarg(env);
     }
 
-    enif_alloc_binary(env, RSA_size(rsa), &ret_bin); 
+    enif_alloc_binary(RSA_size(rsa), &ret_bin); 
 
     if (argv[3] == atom_true) {
 	ERL_VALGRIND_ASSERT_MEM_DEFINED(buf+i,data_len);
@@ -1163,7 +1163,7 @@ static ERL_NIF_TERM rsa_private_crypt(ErlNifEnv* env, int argc, const ERL_NIF_TE
 				ret_bin.data, rsa, padding);       
 	if (i > 0) {
 	    ERL_VALGRIND_MAKE_MEM_DEFINED(ret_bin.data, i);
-	    enif_realloc_binary(env, &ret_bin, i);
+	    enif_realloc_binary(&ret_bin, i);
 	}
     }
     RSA_free(rsa);
@@ -1293,11 +1293,11 @@ static ERL_NIF_TERM dh_compute_key_nif(ErlNifEnv* env, int argc, const ERL_NIF_T
 	ret = enif_make_badarg(env);
     }
     else {
-	enif_alloc_binary(env, DH_size(dh_params), &ret_bin);
+	enif_alloc_binary(DH_size(dh_params), &ret_bin);
 	i = DH_compute_key(ret_bin.data, pubkey, dh_params);
 	if (i > 0) {
 	    if (i != ret_bin.size) {
-		enif_realloc_binary(env, &ret_bin, i); 
+		enif_realloc_binary(&ret_bin, i); 
 	    }
 	    ret = enif_make_binary(env, &ret_bin);
 	}