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Diffstat (limited to 'erts/doc/src/erl_nif.xml')
| -rw-r--r-- | erts/doc/src/erl_nif.xml | 724 |
1 files changed, 621 insertions, 103 deletions
diff --git a/erts/doc/src/erl_nif.xml b/erts/doc/src/erl_nif.xml index c636d65ef3..d25c63be3d 100644 --- a/erts/doc/src/erl_nif.xml +++ b/erts/doc/src/erl_nif.xml @@ -34,31 +34,37 @@ <lib>erl_nif</lib> <libsummary>API functions for an Erlang NIF library</libsummary> <description> - <warning><p>The NIF concept is introduced in R13B03 as an + <warning><p>The NIF concept was introduced in R13B03 as an EXPERIMENTAL feature. The interfaces may be changed in any way - in coming releases. The API introduced in this release is very - sparse and contains only the most basic functions to read and - write Erlang terms. - </p></warning> + 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>R13B04</em>:</p> + <list> + <item>The function prototypes of the NIFs have changed to expect <c>argc</c> and <c>argv</c> + arguments. The arity of a NIF is by that no longer limited to 3.</item> + <item><c>enif_get_data</c> renamed as <c>enif_priv_data</c>.</item> + <item><c>enif_make_string</c> got a third argument for character encoding.</item> + </list> + </warning> <p>A NIF library contains native implementation of some functions - of an erlang module. The native implemented functions (NIFs) are + of an Erlang module. The native implemented functions (NIFs) are called like any other functions without any difference to the caller. Each NIF must also have an implementation in Erlang that will be invoked if the function is called before the NIF library has been successfully loaded. A typical such stub implementation is to throw an exception. But it can also be used as a fallback implementation if the NIF library is not implemented for some - architecture.</p> + architecture.</p> <p>A minimal example of a NIF library can look like this:</p> <p/> <code type="none"> /* niftest.c */ #include "erl_nif.h" -static ERL_NIF_TERM hello(ErlNifEnv* env) +static ERL_NIF_TERM hello(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]) { - return enif_make_string(env, "Hello world!"); + return enif_make_string(env, "Hello world!", ERL_NIF_LATIN1); } static ErlNifFunc nif_funcs[] = @@ -69,7 +75,7 @@ static ErlNifFunc nif_funcs[] = ERL_NIF_INIT(niftest,nif_funcs,NULL,NULL,NULL,NULL) </code> - <p>and the erlang module would have to look something like + <p>and the Erlang module would have to look something like this:</p> <p/> <code type="none"> @@ -100,8 +106,13 @@ ok </code> <p>A better solution for a real module is to take advantage of - the new attribute <c>on_load</c> to automatically load the NIF - library when the module is loaded.</p> + 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 loaded NIF library is tied to the Erlang module code version that loaded it. If the module is upgraded with a new version, the new code will have to load its own NIF library (or maybe choose not @@ -110,16 +121,94 @@ ok dynamic library will mean that static data defined by the library will be shared as well. To avoid unintentionally shared static data, each Erlang module code can keep its own private data. This - global private data can be set when the NIF library is loaded and - then retrieved by calling <seealso marker="erl_nif#enif_get_data">enif_get_data()</seealso>.</p> - <p>There is currently 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 can also be unloaded by replacing it with another - version of the library by a second call to + 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> + <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 + by another version of the library by a second call to <c>erlang:load_nif/2</c> from the same module code.</p> </description> - + <section> + <title>FUNCTIONALITY</title> + <p>All functions that a NIF library needs to do with Erlang are + performed through the NIF API functions. There are functions + for the following functionality:</p> + <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> + 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> + <tag>Binaries</tag> + <item><p>Terms of type binary are accessed through the struct type <seealso marker="#ErlNifBinary">ErlNifBinary</seealso> + that contains a pointer (<c>data</c>) to the raw binary data and the length + (<c>size</c>) of the data in bytes. Both <c>data</c> and <c>size</c> are + read-only and should only be written using calls to API functions. + Instances of <c>ErlNifBinary</c> are however always allocated by the user + (usually as local variables).</p> + <p>The raw data pointed to by <c>data</c> is only mutable after a call to + <seealso marker="#enif_alloc_binary">enif_alloc_binary</seealso>. + All other functions that operates on a binary will leave the data as read-only. + An allocated binary must in the end either be freed with + <seealso marker="#enif_release_binary">enif_release_binary</seealso> + or transferred to an Erlang term with <seealso marker="#enif_make_binary">enif_make_binary</seealso>. + But it does not have do happen in the same NIF call.</p> + <p>Binaries must be a number of whole bytes. Bitstrings with an arbitrary + bit length have no support yet.</p> + </item> + <tag>Resource objects</tag> + <item><p>Resource objects are 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>. + 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>. + 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> + 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> + (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 or applications to be distinguishable. + A resource type is created by calling + <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 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 also 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 library will thereafter be called for the inherited + objects and the library with the old destructor function can be safely + unloaded. Resource types are uniquely identified by a supplied name string. + </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> + <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 + responsiveness of the VM. NIFs are called directly by the same scheduler + thread that executed the calling Erlang code. The calling scheduler will thus + be blocked from doing any other work until the NIF returns.</p> + </item> + </taglist> + </section> <section> <title>INITIALIZATION</title> <taglist> @@ -143,9 +232,9 @@ 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 able to keep a state between NIF - calls. <c>enif_get_data()</c> will return this pointer.</p> + calls. <c>enif_priv_data()</c> will return this pointer.</p> <p><c>load_info</c> is the second argument to <seealso - marker="erlang#erlang:load_nif-2">erlang:load_nif/2</seealso>.</p> + marker="erlang#load_nif-2">erlang:load_nif/2</seealso>.</p> <p>The library will fail to load if <c>load</c> returns anything other than 0. <c>load</c> can be NULL in case no initialization is needed.</p> @@ -165,13 +254,11 @@ ok <tag><marker id="upgrade"/>int (*upgrade)(ErlNifEnv* env, void** priv_data, void** old_priv_data, ERL_NIF_TERM load_info)</tag> <item><p><c>upgrade</c> is called when the NIF library is loaded and there is no previously loaded library for this module - code, BUT there is old code of this module with a - loaded NIF library.</p> + code, BUT there is old code of this module with a loaded NIF library.</p> <p>Works the same as <c>load</c>. The only difference is that <c>*old_priv_data</c> already contains the value set by the last call to <c>load</c> or <c>reload</c> for the old module - code. It is allowed to write to both *priv_data and - *old_priv_data.</p> + code. It is allowed to write to both *priv_data and *old_priv_data.</p> <p>The library will fail to load if <c>upgrade</c> returns anything other than 0 or if <c>upgrade</c> is NULL.</p> </item> @@ -182,7 +269,6 @@ ok of the same module may or may not exist.</p> </item> - </taglist> </section> @@ -190,7 +276,15 @@ ok <title>DATA TYPES</title> <taglist> - <tag><marker id="ErlDrvEnv"/>ErlDrvEnv</tag> + <tag><marker id="ERL_NIF_TERM"/>ERL_NIF_TERM</tag> + <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> + </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 @@ -205,81 +299,151 @@ ok <p/> <code type="none"> typedef struct { - const char* name; - unsigned arity; - ERL_NIF_TERM (*fptr)(ErlNifEnv* env, ...); + const char* <em>name</em>; + unsigned <em>arity</em>; + ERL_NIF_TERM (*<em>fptr</em>)(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]); } ErlNifFunc; </code> <p>Describes a NIF by its name, arity and implementation. <c>fptr</c> is a pointer to the function that implements the - NIF. The number of arguments must match the arity. A NIF of - arity 2 will thus look like:</p> - <p/> - <code type="none"> -ERL_NIF_TERM my_nif(ErlNifEnv* env, ERL_NIF_TERM arg1, ERL_NIF_TERM arg2) -{ - /* ... */ -} -</code> - <p>The maximum allowed arity for a NIF is 3 in current implementation.</p> + NIF. The argument <c>argv</c> of a NIF will contain the + function arguments passed to the NIF and <c>argc</c> is the + length of the array, i.e. the function arity. <c>argv[N-1]</c> + will thus denote the Nth argument to the NIF. Note that the + <c>argc</c> argument allows for the same C function to + implement several Erlang functions with different arity (but + same name probably).</p> </item> <tag><marker id="ErlNifBinary"/>ErlNifBinary</tag> <item> <p/> <code type="none"> typedef struct { - unsigned size; - unsigned char* data; + unsigned <em>size</em>; + unsigned char* <em>data</em>; } ErlNifBinary; </code> <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> </item> - <tag><marker id="ERL_NIF_TERM"/>ERL_NIF_TERM</tag> + <tag><marker id="ErlNifResourceType"/>ErlNifResourceType</tag> <item> - <p>Variables of type <c>ERL_NIF_TERM</c> can refere 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> - </item> + <p>Each instance of <c>ErlNifResourceType</c> represent a class of + memory managed resource objects that can be garbage collected. + Each resource type has a unique name and a destructor function that + is called when objects of its type are released.</p> + </item> + <tag><marker id="ErlNifResourceDtor"/>ErlNifResourceDtor</tag> + <item> + <p/> + <code type="none"> +typedef void ErlNifResourceDtor(ErlNifEnv* env, void* obj); +</code> + <p>The function prototype of a resource destructor function. + A destructor function is not allowed to call any term-making functions.</p> + </item> + <tag><marker id="ErlNifCharEncoding"/>ErlNifCharEncoding</tag> + <item> + <p/> + <code type="none"> +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> + </item> + <tag><marker id="ErlNifSysInfo"/>ErlNifSysInfo</tag> + <item> + <p>Used by <seealso marker="#enif_system_info">enif_system_info</seealso> + to return information about the runtime system. Contains currently + the exact same content as <seealso marker="erl_driver#ErlDrvSysInfo">ErlDrvSysInfo</seealso>.</p> + </item> + </taglist> </section> <funcs> - <func><name><ret>void*</ret><nametext>enif_get_data(ErlNifEnv* env)</nametext></name> - <fsummary>Get the private data of a NIF library</fsummary> - <desc><p>Returns the pointer to the private data that was set by <c>load</c>, <c>reload</c> or <c>upgrade</c>.</p></desc> - </func> <func><name><ret>void*</ret><nametext>enif_alloc(ErlNifEnv* env, size_t size)</nametext></name> <fsummary>Allocate dynamic memory.</fsummary> - <desc><p>Allocate memory of <c>size</c> bytes.</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_is_binary(ErlNifEnv* env, ERL_NIF_TERM term)</nametext></name> - <fsummary>Determine if a term is a binary</fsummary> - <desc><p>Return true if <c>term</c> is a binary</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 - transient information about the binary term - <c>bin_term</c>. Return false if <c>bin_term</c> is not a binary.</p></desc> + <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> <fsummary>Create a new binary.</fsummary> <desc><p>Allocate a new binary of size of <c>size</c> bytes. Initialize the structure pointed to by <c>bin</c> to - refer to the allocated binary.</p></desc> + refer to the allocated binary. The binary must either be released by + <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>. + An allocated (and owned) <c>ErlNifBinary</c> can be kept between NIF + calls.</p> + <p>Return false if allocation failed.</p> + </desc> </func> - <func><name><ret>void</ret><nametext>enif_release_binary(ErlNifEnv* env, ErlNifBinary* bin)</nametext></name> - <fsummary>Release a binary.</fsummary> - <desc><p>Release a binary obtained from <c>enif_alloc_binary</c> or <c>enif_inspect_binary</c>.</p></desc> + <func><name><ret>void*</ret><nametext>enif_alloc_resource(ErlNifEnv* env, 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> + <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, + equal, or greater than <c>rhs</c>. Corresponds to the Erlang + operators <c>==</c>, <c>/=</c>, <c>=<</c>, <c><</c>, + <c>>=</c> and <c>></c> (but <em>not</em> <c>=:=</c> or <c>=/=</c>).</p></desc> + </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>. + </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>. + </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>. + </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>. + </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>. + </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>. + </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> + <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 + <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_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> </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> @@ -287,45 +451,145 @@ typedef struct { <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> </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 long integer</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> - </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> </func> - <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_binary(ErlNifEnv* env, ErlNifBinary* bin)</nametext></name> - <fsummary>Make a binary term.</fsummary> - <desc><p>Make a binary term from <c>bin</c>. Will also release - the binary.</p></desc> + <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 + outside the bounds of type <c>long int</c>.</p></desc> </func> - <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_badarg(ErlNifEnv* env)</nametext></name> - <fsummary>Make a badarg exception.</fsummary> - <desc><p>Make a badarg exception to be returned from a NIF.</p></desc> + <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 + of type <c>type</c>.</p></desc> </func> - <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_int(ErlNifEnv* env, int i)</nametext></name> - <fsummary>Create an integer term</fsummary> - <desc><p>Create an integer term.</p></desc> + <func><name><ret>int</ret><nametext>enif_get_string(ErlNifEnv* env, + ERL_NIF_TERM list, char* buf, unsigned size, + ErlNifCharEncoding encode)</nametext></name> + <fsummary>Get a C-string from a list.</fsummary> + <desc><p>Write a null-terminated string, in the buffer pointed to by + <c>buf</c> with size <c>size</c>, consisting of the characters + in the string <c>list</c>. The characters are written using encoding + <seealso marker="#ErlNifCharEncoding">encode</seealso>. + Return the number of bytes written (including terminating null + character), or <c>-size</c> if the string was truncated due to + buffer space, or 0 if <c>list</c> is not a string that can be + encoded with <c>encode</c> or if <c>size</c> was less than 1. + The written string is always null-terminated unless buffer + <c>size</c> is less than 1.</p></desc> </func> - <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_ulong(ErlNifEnv* env, unsigned long i)</nametext></name> - <fsummary>Create an integer term from an unsigned long int</fsummary> - <desc><p>Create an integer term from an <c>unsigned long int</c>.</p></desc> + <func><name><ret>int</ret><nametext>enif_get_tuple(ErlNifEnv* env, ERL_NIF_TERM term, int* arity, const ERL_NIF_TERM** array)</nametext></name> + <fsummary>Inspect the elements of a tuple.</fsummary> + <desc><p>If <c>term</c> is a tuple, set <c>*array</c> to point + to an array containing the elements of the tuple and set + <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 + 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> + </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> + </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> + </func> + <func><name><ret>int</ret><nametext>enif_inspect_iolist_as_binary(ErlNifEnv* + env, ERL_NIF_TERM term, ErlNifBinary* bin) + </nametext></name> + <fsummary>Inspect the content of an iolist</fsummary> + <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 + iolist.</p> + </desc> + </func> + <func><name><ret>int</ret><nametext>enif_is_atom(ErlNifEnv* env, ERL_NIF_TERM term)</nametext></name> + <fsummary>Determine if a term is an atom</fsummary> + <desc><p>Return true if <c>term</c> is an atom.</p></desc> + </func> + <func><name><ret>int</ret><nametext>enif_is_binary(ErlNifEnv* env, ERL_NIF_TERM term)</nametext></name> + <fsummary>Determine if a term is a binary</fsummary> + <desc><p>Return true if <c>term</c> is a binary</p></desc> + </func> + <func><name><ret>int</ret><nametext>enif_is_empty_list(ErlNifEnv* env, ERL_NIF_TERM term)</nametext></name> + <fsummary>Determine if a term is an empty list</fsummary> + <desc><p>Return true if <c>term</c> is an empty list.</p></desc> + </func> + <func><name><ret>int</ret><nametext>enif_is_fun(ErlNifEnv* env, ERL_NIF_TERM term)</nametext></name> + <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> + <fsummary>Erlang operator =:=</fsummary> + <desc><p>Return true if the two terms are identical. Corresponds to the + Erlang operators <c>=:=</c> and + <c>=/=</c>.</p></desc> + </func> + <func><name><ret>int</ret><nametext>enif_is_pid(ErlNifEnv* env, ERL_NIF_TERM term)</nametext></name> + <fsummary>Determine if a term is a pid</fsummary> + <desc><p>Return true if <c>term</c> is a pid.</p></desc> + </func> + <func><name><ret>int</ret><nametext>enif_is_port(ErlNifEnv* env, ERL_NIF_TERM term)</nametext></name> + <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> </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 C-string <c>name</c>. Atom + <desc><p>Create an atom term from the C-string <c>name</c>. Unlike other terms, atom terms may be saved and used between NIF calls.</p></desc> </func> - <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_tuple(ErlNifEnv* env, unsigned cnt, ...)</nametext></name> - <fsummary>Create a tuple term.</fsummary> - <desc><p>Create a tuple term of arity <c>cnt</c>. Expects - <c>cnt</c> number of arguments (after <c>cnt</c>) of type ERL_NIF_TERM as the - elements of the tuple.</p></desc> + <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_badarg(ErlNifEnv* env)</nametext></name> + <fsummary>Make a badarg exception.</fsummary> + <desc><p>Make a badarg exception to be returned from a NIF.</p></desc> + </func> + <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_binary(ErlNifEnv* env, ErlNifBinary* bin)</nametext></name> + <fsummary>Make a binary term.</fsummary> + <desc><p>Make a binary term from <c>bin</c>. Any ownership of + the binary data will be transferred to the created term and + <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_double(ErlNifEnv* env, double d)</nametext></name> + <fsummary>Create an floating-point term</fsummary> + <desc><p>Create an 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> + <fsummary>Create an existing atom term</fsummary> + <desc><p>Try to create the term of an already existing atom from + the C-string <c>name</c>. If the atom already exist 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> + <fsummary>Create an integer term</fsummary> + <desc><p>Create an integer term.</p></desc> </func> <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_list(ErlNifEnv* env, unsigned cnt, ...)</nametext></name> <fsummary>Create a list term.</fsummary> @@ -333,19 +597,273 @@ typedef struct { <c>cnt</c> number of arguments (after <c>cnt</c>) of type ERL_NIF_TERM as the elements of the list. An empty list is returned if <c>cnt</c> is 0.</p></desc> </func> + <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_list1(ErlNifEnv* env, ERL_NIF_TERM e1)</nametext></name> + <name><ret>ERL_NIF_TERM</ret><nametext>enif_make_list2(ErlNifEnv* env, ERL_NIF_TERM e1, ERL_NIF_TERM e2)</nametext></name> + <name><ret>ERL_NIF_TERM</ret><nametext>enif_make_list3(ErlNifEnv* env, ERL_NIF_TERM e1, ERL_NIF_TERM e2, ERL_NIF_TERM e3)</nametext></name> + <name><ret>ERL_NIF_TERM</ret><nametext>enif_make_list4(ErlNifEnv* env, ERL_NIF_TERM e1, ..., ERL_NIF_TERM e4)</nametext></name> + <name><ret>ERL_NIF_TERM</ret><nametext>enif_make_list5(ErlNifEnv* env, ERL_NIF_TERM e1, ..., ERL_NIF_TERM e5)</nametext></name> + <name><ret>ERL_NIF_TERM</ret><nametext>enif_make_list6(ErlNifEnv* env, ERL_NIF_TERM e1, ..., ERL_NIF_TERM e6)</nametext></name> + <name><ret>ERL_NIF_TERM</ret><nametext>enif_make_list7(ErlNifEnv* env, ERL_NIF_TERM e1, ..., ERL_NIF_TERM e7)</nametext></name> + <name><ret>ERL_NIF_TERM</ret><nametext>enif_make_list8(ErlNifEnv* env, ERL_NIF_TERM e1, ..., ERL_NIF_TERM e8)</nametext></name> + <name><ret>ERL_NIF_TERM</ret><nametext>enif_make_list9(ErlNifEnv* env, ERL_NIF_TERM e1, ..., ERL_NIF_TERM e9)</nametext></name> + <fsummary>Create a list term.</fsummary> + <desc><p>Create an ordinary list term with length indicated by the + function name. Prefer these functions (macros) over the variadic + <c>enif_make_list</c> to get compile time error if the number of + arguments does not match.</p></desc> + </func> <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_list_cell(ErlNifEnv* env, ERL_NIF_TERM head, ERL_NIF_TERM tail)</nametext></name> <fsummary>Create a list cell.</fsummary> <desc><p>Create a list cell <c>[head | tail]</c>.</p></desc> </func> - <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_string(ErlNifEnv* env, const char* string)</nametext></name> + <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_list_from_array(ErlNifEnv* env, const ERL_NIF_TERM arr[], unsigned cnt)</nametext></name> + <fsummary>Create a list term from an array.</fsummary> + <desc><p>Create an ordinary list containing the elements of array <c>arr</c> + of length <c>cnt</c>. An empty list is returned if <c>cnt</c> is 0.</p></desc> + </func> + <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_long(ErlNifEnv* env, long int i)</nametext></name> + <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>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> + </func> + <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_resource(ErlNifEnv* env, void* obj)</nametext></name> + <fsummary>Create an opaque handle to a resource object</fsummary> + <desc><p>Create an opaque handle to a memory managed resource object + obtained by <seealso marker="#enif_alloc_resource">enif_alloc_resource</seealso>. + No ownership transfer is done, the resource object still needs to be released by + <seealso marker="#enif_release_resource">enif_release_resource</seealso>.</p> + <p>Note that the only defined behaviour when using of a resource term in + an Erlang program is to store it and send it between processes on the + 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_string(ErlNifEnv* env, const char* string, ErlNifCharEncoding encoding)</nametext></name> <fsummary>Create a string.</fsummary> - <desc><p>Creates a list containing the characters of the - C-string <c>string</c>.</p></desc> + <desc><p>Create a list containing the characters of the + null-terminated string <c>string</c> with encoding <seealso marker="#ErlNifCharEncoding">encoding</seealso>.</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> + <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. + <c>bin_term</c> must be a binary or bitstring and + <c>pos+size</c> must be less or equal to the number of whole + bytes in <c>bin_term</c>.</p></desc> + </func> + <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_tuple(ErlNifEnv* env, unsigned cnt, ...)</nametext></name> + <fsummary>Create a tuple term.</fsummary> + <desc><p>Create a tuple term of arity <c>cnt</c>. Expects + <c>cnt</c> number of arguments (after <c>cnt</c>) of type ERL_NIF_TERM as the + elements of the tuple.</p></desc> + </func> + <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_tuple1(ErlNifEnv* env, ERL_NIF_TERM e1)</nametext></name> + <name><ret>ERL_NIF_TERM</ret><nametext>enif_make_tuple2(ErlNifEnv* env, ERL_NIF_TERM e1, ERL_NIF_TERM e2)</nametext></name> + <name><ret>ERL_NIF_TERM</ret><nametext>enif_make_tuple3(ErlNifEnv* env, ERL_NIF_TERM e1, ERL_NIF_TERM e2, ERL_NIF_TERM e3)</nametext></name> + <name><ret>ERL_NIF_TERM</ret><nametext>enif_make_tuple4(ErlNifEnv* env, ERL_NIF_TERM e1, ..., ERL_NIF_TERM e4)</nametext></name> + <name><ret>ERL_NIF_TERM</ret><nametext>enif_make_tuple5(ErlNifEnv* env, ERL_NIF_TERM e1, ..., ERL_NIF_TERM e5)</nametext></name> + <name><ret>ERL_NIF_TERM</ret><nametext>enif_make_tuple6(ErlNifEnv* env, ERL_NIF_TERM e1, ..., ERL_NIF_TERM e6)</nametext></name> + <name><ret>ERL_NIF_TERM</ret><nametext>enif_make_tuple7(ErlNifEnv* env, ERL_NIF_TERM e1, ..., ERL_NIF_TERM e7)</nametext></name> + <name><ret>ERL_NIF_TERM</ret><nametext>enif_make_tuple8(ErlNifEnv* env, ERL_NIF_TERM e1, ..., ERL_NIF_TERM e8)</nametext></name> + <name><ret>ERL_NIF_TERM</ret><nametext>enif_make_tuple9(ErlNifEnv* env, ERL_NIF_TERM e1, ..., ERL_NIF_TERM e9)</nametext></name> + <fsummary>Create a tuple term.</fsummary> + <desc><p>Create a tuple term with length indicated by the + function name. Prefer these functions (macros) over the variadic + <c>enif_make_tuple</c> to get compile time error if the number of + arguments does not match.</p></desc> + </func> + <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_tuple_from_array(ErlNifEnv* env, const ERL_NIF_TERM arr[], unsigned cnt)</nametext></name> + <fsummary>Create a tuple term from an array.</fsummary> + <desc><p>Create a tuple containing the elements of array <c>arr</c> + of length <c>cnt</c>.</p></desc> + </func> + <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_uint(ErlNifEnv* env, unsigned int i)</nametext></name> + <fsummary>Create an unsigned integer term</fsummary> + <desc><p>Create an integer term from an <c>unsigned int</c>.</p></desc> + </func> + <func><name><ret>ERL_NIF_TERM</ret><nametext>enif_make_ulong(ErlNifEnv* env, unsigned long i)</nametext></name> + <fsummary>Create an integer term from an unsigned long int</fsummary> + <desc><p>Create an integer term from an <c>unsigned long int</c>.</p></desc> + </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>. + </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>. + </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>. + </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>. + </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>. + </p></desc> + </func> + <func><name><ret>ErlNifResourceType*</ret><nametext>enif_open_resource_type(ErlNifEnv* env, 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 + <c>name</c> and give it the destructor function pointed to by <seealso marker="#ErlNifResourceDtor">dtor</seealso>. + Argument <c>flags</c> can have the following values:</p> + <taglist> + <tag><c>ERL_NIF_RT_CREATE</c></tag> + <item>Create a new resource type that does not already exist.</item> + <tag><c>ERL_NIF_RT_TAKEOVER</c></tag> + <item>Open an existing resource type and take over ownership of all its instances. + 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 unintentionally + 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>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. + On failure, return <c>NULL</c> and set <c>*tried</c> to <c>flags</c>. + It is allowed to set <c>tried</c> to <c>NULL</c>.</p> + <p>Note that <c>enif_open_resource_type</c> is only allowed to be called in the three callbacks + <seealso marker="#load">load</seealso>, <seealso marker="#reload">reload</seealso> + and <seealso marker="#upgrade">upgrade</seealso>.</p> + </desc> + </func> + <func><name><ret>void*</ret><nametext>enif_priv_data(ErlNifEnv* env)</nametext></name> + <fsummary>Get the private data of a NIF library</fsummary> + <desc><p>Return the pointer to the private data that was set by <c>load</c>, + <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_release_binary(ErlNifEnv* env, ErlNifBinary* bin)</nametext></name> + <fsummary>Release a binary.</fsummary> + <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> + <fsummary>Release a resource object.</fsummary> + <desc><p>Release a resource objects 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> + </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>. + </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>. + </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>. + </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>. + </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>. + </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>. + </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>. + </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>. + </p></desc> + </func> + <func><name><ret>unsigned</ret><nametext>enif_sizeof_resource(ErlNifEnv* env, 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> + </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>. + </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>. + </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>. + </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>. + </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>. + </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>. + </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>. + </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>. + </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>. + </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>. + </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>. + </p></desc> </func> </funcs> <section> <title>SEE ALSO</title> - <p><seealso marker="erlang#erlang:load_nif-2">load_nif(3)</seealso></p> + <p><seealso marker="erlang#load_nif-2">load_nif(3)</seealso></p> </section> </cref> |