Merge branch 'rickard/dist/OTP-14459' into rickard/dist/master/OTP-14459

Conflicts:
	erts/emulator/beam/bif.c
	erts/emulator/beam/dist.c
	erts/emulator/beam/dist.h
	erts/emulator/beam/erl_bif_info.c
	erts/emulator/beam/erl_node_tables.c
	erts/emulator/beam/erl_node_tables.h
	erts/emulator/beam/external.c

25 files changed, 2324 insertions, 520 deletions

diff --git a/erts/doc/src/Makefile b/erts/doc/src/Makefile
index b96cbbce40..444adf4a6e 100644
--- a/erts/doc/src/Makefile
+++ b/erts/doc/src/Makefile
@@ -173,6 +173,8 @@ release_docs_spec: docs
 		"$(RELSYSDIR)/doc/html"
 	$(INSTALL_DATA) $(ERL_TOP)/erts/example/time_compat.erl \
 		"$(RELSYSDIR)/doc/html"
+	$(INSTALL_DATA) $(ERL_TOP)/lib/kernel/examples/gen_tcp_dist/src/gen_tcp_dist.erl \
+		"$(RELSYSDIR)/doc/html"
 	$(INSTALL_DATA) $(INFO_FILE) "$(RELSYSDIR)"
 	$(INSTALL_DIR) "$(RELEASE_PATH)/man/man3"
 	$(INSTALL_DATA) $(MAN3DIR)/* "$(RELEASE_PATH)/man/man3"
diff --git a/erts/doc/src/alt_dist.xml b/erts/doc/src/alt_dist.xml
index be969a8267..d3731a5391 100644
--- a/erts/doc/src/alt_dist.xml
+++ b/erts/doc/src/alt_dist.xml
@@ -47,23 +47,30 @@
     runs on. The reason the C code is not made portable, is simply
     readability.</p>
 
-  <note>
-    <p>This section was written a long time ago. Most of it is still
-      valid, but some things have changed since then.
-      Most notably is the driver interface. Some updates have been made
-      to the documentation of the driver presented here,
-      but more can be done and is planned for the future.
-      The reader is encouraged to read the
-      <seealso marker="erl_driver"><c>erl_driver</c></seealso> and
-      <seealso marker="driver_entry"><c>driver_entry</c></seealso>
-      documentation also.</p>
-  </note>
-
   <section>
     <title>Introduction</title>
     <p>To implement a new carrier for the Erlang distribution, the main
       steps are as follows.</p>
 
+      <note><p>
+	As of ERTS version 10.0 support for distribution controller
+	processes has been introduced. That is, the traffic over a
+	distribution channel can be managed by a process instead of
+	only by a port. This makes it possible to implement large
+	parts of the logic in Erlang code, and you perhaps do not
+	even need a new driver for the protocol. One example could
+	be Erlang distribution over UDP using <c>gen_udp</c> (your
+	Erlang code will of course have to take care of retranspissions,
+	etc in this example). That is, depending on what you want
+	to do you perhaps do not need to implement a driver at all
+	and can then skip the driver related sections below.
+	The <c>gen_tcp_dist</c> example described in the
+	<seealso marker="#distribution_module">Distribution
+	Module</seealso> section utilize distribution controller
+	processes and can be worth having a look at if you want to
+	use distribution controller processes.
+      </p></note>
+
     <section>
       <title>Writing an Erlang Driver</title>
       <p>First, the protocol must be available to the Erlang machine, which
@@ -152,7 +159,712 @@
   </section>
 
   <section>
+    <marker id="distribution_module"/>
+    <title>Distribution Module</title>
+    <p>
+      The distribution module expose an API that <c>net_kernel</c> call
+      in order to manage connections to other nodes. The module name
+      should have the suffix <c>_dist</c>.
+    </p>
+    <p>
+      The module needs to create some kind of listening entity (process
+      or port) and an acceptor process that accepts incoming connections
+      using the listening entity. For each connection, the module at least
+      needs to create one connection supervisor process, which also is
+      responsible for the handshake when setting up the connection, and
+      a distribution controller (process or port) responsible for
+      transport of data over the connection. The distribution controller
+      and the connection supervisor process should be linked together
+      so both of them are cleaned up when the connection is taken down.
+    </p>
+    <p>
+      Note that there need to be exactly one distribution controller
+      per connection. A process or port can only be distribution
+      controller for one connection. The registration as distribution
+      controller cannot be undone. It will stick until the distribution
+      controller terminates. The distribution controller should not
+      ignore exit signals. It is allowed to trap exits, but it should
+      then voluntarily terminate when an exit signal is received.
+    </p>
+    <p>
+      An example implementation of a distribution module can be found
+      in
+      <url href="gen_tcp_dist.erl">$ERL_TOP/lib/kernel/examples/gen_tcp_dist/src/gen_tcp_dist.erl</url>.
+      It implements the distribution over TCP/IP using the <c>gen_tcp</c>
+      API with distribution controllers implemented by processes. This
+      instead of using port distribution controllers as the ordinary TCP/IP
+      distribution uses.
+    </p>
+
+    <section>
+      <marker id="distribution_module_exported_callback_functions"/>
+      <title>Exported Callback Functions</title>
+
+      <p>
+	The following functions are mandatory:
+      </p>
+      <taglist>
+	<tag><marker id="listen"/><c>listen(Name) -></c><br/>&nbsp;&nbsp;<c>{ok, {Listen, Address, Creation}} | {error, Error} </c></tag>
+	<item>
+	  <p>
+	    <c>listen/1</c> is called once in order to listen for incoming
+	    connection requests. The call is made when the distribution is brought
+	    up. The argument <c>Name</c> is the part of the node name before
+	    the <c>@</c> sign in the full node name. It can be either an atom or a
+	    string.
+	  </p>
+	  <p>
+	    The return value consists of a <c>Listen</c> handle (which is
+	    later passed to the <seealso marker="#accept"><c>accept/1</c></seealso>
+	    callback), <c>Address</c> which is a <c>#net_address{}</c> record
+	    with information about the address for the node (the
+	    <c>#net_address{}</c> record is defined in
+	    <c>kernel/include/net_address.hrl</c>), and <c>Creation</c> which
+	    (currently) is an integer <c>1</c>, <c>2</c>, or <c>3</c>.
+	  </p>
+	  <p>
+	    If <seealso marker="erts:epmd"><c>epmd</c></seealso> is to be used 
+	    for node discovery, you typically want to use the (unfortunately
+	    undocumented) <c>erl_epmd</c> module (part of the <c>kernel</c>
+	    application) in order to register the listen port with <c>epmd</c>
+	    and retrieve <c>Creation</c> to use.
+	  </p>
+	</item>
+
+	<tag><marker id="accept"/><c>accept(Listen) -></c><br/>&nbsp;&nbsp;<c>AcceptorPid</c></tag>
+	<item>
+	  <p>
+	    <c>accept/1</c> should spawn a process that accepts connections. This
+	    process should preferably execute on <c>max</c> priority. The process
+	    identifier of this process should be returned.
+	  </p>
+	  <p>
+	    The <c>Listen</c> argument will be the same as the <c>Listen</c> handle
+	    part of the return value of the
+	    <seealso marker="#listen"><c>listen/1</c></seealso> callback above.
+	    <c>accept/1</c> is called only once when the distribution protocol is
+	    started.
+	  </p>
+	  <p>
+	    The caller of this function is a representative for <c>net_kernel</c>
+	    (this may or may not be the process registered as <c>net_kernel</c>)
+	    and is in this document identified as <c>Kernel</c>.
+	    When a connection has been accepted by the acceptor process, it needs
+	    to inform <c>Kernel</c> about the accepted connection. This is done by
+	    passing a message on the form:
+	  </p>
+	  <code type="none"><![CDATA[Kernel ! {accept, AcceptorPid, DistController, Family, Proto}]]></code>
+	  <p>
+	    <c>DistController</c> is either the process or port identifier
+	    of the distribution controller for the connection. The
+	    distribution controller should be created by the acceptor
+	    processes when a new connection is accepted. Its job is to
+	    dispatch traffic on the connection.
+	  </p>
+	  <c>Kernel</c> responds with one of the following messages:
+	  <taglist>
+	    <tag><c>{Kernel, controller, SupervisorPid}</c></tag>
+	    <item>
+	      <p>
+		The request was accepted and <c>SupervisorPid</c> is the
+		process identifier of the connection supervisor process
+		(which is created in the
+		<seealso marker="#accept_connection"><c>accept_connection/5</c></seealso>
+		callback).
+	      </p>
+	    </item>
+	    <tag><c>{Kernel, unsupported_protocol}</c></tag>
+	    <item>
+	      <p>
+		The request was rejected. This is a fatal error. The acceptor
+		process should terminate.
+	      </p>
+	    </item>
+	  </taglist>
+	  <p>
+	    When an accept sequence has been completed the acceptor process
+	    is expected to continue accepting further requests.
+	  </p>
+	</item>
+
+	<tag><marker id="accept_connection"/><c>accept_connection(AcceptorPid, DistCtrl, MyNode, Allowed, SetupTime) -></c><br/>&nbsp;&nbsp;<c>ConnectionSupervisorPid</c></tag>
+	<item>
+	  <p>
+	    <c>accept_connection/5</c> should spawn a process that will
+	    perform the Erlang distribution handshake for the connection.
+	    If the handshake successfully completes it should continue to
+	    function as a connection supervisor. This process
+	    should preferably execute on <c>max</c> priority.
+	  </p>
+	  <p>The arguments:</p>
+	  <taglist>
+	    <tag><c>AcceptorPid</c></tag>
+	    <item>
+	      <p>
+		Process identifier of the process created by the
+		<seealso marker="#accept"><c>accept/1</c></seealso>
+		callback.
+	      </p>
+	    </item>
+	    <tag><c>DistCtrl</c></tag>
+	    <item>
+	      <p>The identifier of the distribution controller identifier
+	      created by the acceptor process. To be passed along to
+	      <c>dist_util:handshake_other_started(HsData)</c>.
+	      </p>
+	    </item>
+	    <tag><c>MyNode</c></tag>
+	    <item>
+	      <p>
+		Node name of this node. To be passed along to
+	      <c>dist_util:handshake_other_started(HsData)</c>.
+	      </p>
+	    </item>
+	    <tag><c>Allowed</c></tag>
+	    <item>
+	      <p>
+		To be passed along to
+		<c>dist_util:handshake_other_started(HsData)</c>.
+	      </p>
+	    </item>
+	    <tag><c>SetupTime</c></tag>
+	    <item>
+	      <p>
+		Time used for creating a setup timer by a
+		call to <c>dist_util:start_timer(SetupTime)</c>.
+		The timer should be passed along to
+		<c>dist_util:handshake_other_started(HsData)</c>.
+	      </p>
+	    </item>
+	  </taglist>
+	  <p>
+	    The created process should provide callbacks and other
+	    information needed for the handshake in a
+	    <seealso marker="#hs_data_record"><c>#hs_data{}</c></seealso>
+	    record and call <c>dist_util:handshake_other_started(HsData)</c>
+	    with this record.
+	  </p>
+	  <p>
+	    <c>dist_util:handshake_other_started(HsData)</c> will perform
+	    the handshake and if the handshake successfully completes this
+	    process will then continue in a connection supervisor loop
+	    as long as the connection is up.
+	  </p>
+	</item>
+	
+	<tag><marker id="setup"/><c>setup(Node, Type, MyNode, LongOrShortNames, SetupTime) -></c><br/>&nbsp;&nbsp;<c>ConnectionSupervisorPid</c></tag>
+	<item>
+	  <p>
+	    <c>setup/5</c> should spawn a process that connects to
+	    <c>Node</c>. When connection has been established it should
+	    perform the Erlang distribution handshake for the connection.
+	    If the handshake successfully completes it should continue to
+	    function as a connection supervisor. This process
+	    should preferably execute on <c>max</c> priority.
+	  </p>
+	  <p>The arguments:</p>
+	  <taglist>
+	    <tag><c>Node</c></tag>
+	    <item>
+	      <p>
+		Node name of remote node. To be passed along to
+		<c>dist_util:handshake_we_started(HsData)</c>.
+	      </p>
+	    </item>
+	    <tag><c>Type</c></tag>
+	    <item>
+	      <p>
+		Connection type. To be passed along to
+		<c>dist_util:handshake_we_started(HsData)</c>.
+	      </p>
+	    </item>
+	    <tag><c>MyNode</c></tag>
+	    <item>
+	      <p>
+		Node name of this node. To be passed along to
+		<c>dist_util:handshake_we_started(HsData)</c>.
+	      </p>
+	    </item>
+	    <tag><c>LongOrShortNames</c></tag>
+	    <item>
+	      <p>
+		Either the atom <c>longnames</c> or
+		the atom <c>shortnames</c> indicating
+		whether long or short names is used.
+	      </p>
+	    </item>
+	    <tag><c>SetupTime</c></tag>
+	    <item>
+	      <p>
+		Time used for creating a setup timer by a
+		call to <c>dist_util:start_timer(SetupTime)</c>.
+		The timer should be passed along to
+		<c>dist_util:handshake_we_started(HsData)</c>.
+	      </p>
+	    </item>
+	  </taglist>
+	  <p>
+	    The caller of this function is a representative for <c>net_kernel</c>
+	    (this may or may not be the process registered as <c>net_kernel</c>)
+	    and is in this document identified as <c>Kernel</c>. 
+	  </p>
+	  <p>
+	    This function should, besides spawning the connection supervisor,
+	    also create a distribution controller. The distribution
+	    controller is either a process or a port which is responsible
+	    for dispatching traffic.
+	  </p>
+	  <p>
+	    The created process should provide callbacks and other
+	    information needed for the handshake in a
+	    <seealso marker="#hs_data_record"><c>#hs_data{}</c></seealso>
+	    record and call <c>dist_util:handshake_we_started(HsData)</c>
+	    with this record.
+	  </p>
+	  <p>
+	    <c>dist_util:handshake_we_started(HsData)</c> will perform
+	    the handshake and the handshake successfully completes this
+	    process will then continue in a connection supervisor loop
+	    as long as the connection is up.
+	  </p>
+	</item>
+	
+	<tag><marker id="close"/><c>close(Listen) -></c><br/>&nbsp;&nbsp;<c>void()</c></tag>
+	
+	<item><p>
+	  Called in order to close the <c>Listen</c> handle
+	  that originally was passed from the
+	  <seealso marker="#listen"><c>listen/1</c></seealso> callback.
+	</p></item>
+	
+	<tag><marker id="select"/><c>select(NodeName) -></c><br/>&nbsp;&nbsp;<c>boolean()</c></tag>
+	<item>
+	  <p>Return <c>true</c> if the host name part
+	  of the <c>NodeName</c> is valid for use
+	  with this protocol; otherwise, <c>false</c>.
+	  </p>
+	</item>
+	
+      </taglist>
+
+      <p>
+	There are also two optional functions that may be
+	exported:
+      </p>
+      <taglist>
+	<tag><marker id="select"/><c>setopts(Listen, Opts) -></c><br/>&nbsp;&nbsp;<c>ok | {error, Error}</c></tag>
+	<item>
+	  <p>
+	    The argument <c>Listen</c> is the handle originally passed
+	    from the
+	    <seealso marker="#listen"><c>listen/1</c></seealso> callback.
+	    The argument <c>Opts</c> is a list of options to set on future
+	    connections.
+	  </p>
+	</item>
+
+	<tag><marker id="select"/><c>getopts(Listen, Opts) -></c><br/>&nbsp;&nbsp;<c>{ok, OptionValues} | {error, Error}</c></tag>
+	<item>
+	  <p>
+	    The argument <c>Listen</c> is the handle originally passed
+	    from the
+	    <seealso marker="#listen"><c>listen/1</c></seealso> callback.
+	    The argument <c>Opts</c> is a list of options to read for future
+	    connections.
+	  </p>
+	</item>
+      </taglist>
+      
+    </section>
+    <section>
+      <marker id="hs_data_record"/>
+      <title>The #hs_data{} Record</title>
+      <p>
+	The <c>dist_util:handshake_we_started/1</c> and
+	<c>dist_util:handshake_other_started/1</c> functions
+	takes a <c>#hs_data{}</c> record as argument. There
+	are quite a lot of fields in this record that you
+	need to set. The record is defined in
+	<c>kernel/include/dist_util.hrl</c>. Not documented
+	fields should not be set, i.e., should be left as
+	<c>undefined</c>.
+      </p>
+      <p>
+	The following <c>#hs_data{}</c> record fields need
+	to be set unless otherwise stated:</p>
+      <taglist>
+	<tag><marker id="hs_data_kernel_pid"/><c>kernel_pid</c></tag>
+	<item>
+	  <p>
+	    Process identifier of the <c>Kernel</c> process. That is,
+	    the process that called either
+	    <seealso marker="#setup"><c>setup/5</c></seealso> or
+	    <seealso marker="#accept_connection"><c>accept_connection/5</c></seealso>.
+	  </p>
+	</item>
+
+	<tag><marker id="hs_data_other_node"/><c>other_node</c></tag>
+	<item>
+	  <p>Name of the other node. This field is only
+	  mandatory when this node initiates the connection.
+	  That is, when connection is set up via
+	  <seealso marker="#setup"><c>setup/5</c></seealso>.
+	  </p>
+	</item>
+
+	<tag><marker id="hs_data_this_node"/><c>this_node</c></tag>
+	<item>
+	  <p>
+	    The node name of this node.
+	  </p>
+	</item>
+
+	<tag><marker id="hs_data_socket"/><c>socket</c></tag>
+	<item>
+	  <p>
+	    The identifier of the distribution controller.
+	  </p>
+	</item>
+	
+	<tag><marker id="hs_data_timer"/><c>timer</c></tag>
+	<item>
+	  <p>
+	    The timer created using <c>dist_util:start_timer/1</c>.
+	  </p>
+	</item>
+
+	<tag><marker id="hs_data_allowed"/><c>allowed</c></tag>
+	<item>
+	  <p>Information passed as <c>Allowed</c> to
+	  <c>accept_connection/5</c>. This field is only
+	  mandatory when the remote node initiated the
+	  connection. That is, when the connection is set
+	  up via
+	  <seealso marker="#accept_connection"><c>accept_connection/5</c></seealso>.
+	  </p>
+	</item>
+      
+	<tag><marker id="hs_data_f_send"/><c>f_send</c></tag>
+	<item>
+	  <p>
+	    A fun with the following signature:
+	  </p>
+	  <code type="none"><![CDATA[fun (DistCtrlr, Data) -> ok | {error, Error}]]></code>
+	  <p>
+	    where <c>DistCtrlr</c> is the identifier of
+	    the distribution controller and <c>Data</c>
+	    is io data to pass to the other side.
+	  </p>
+	  <p>Only used during handshake phase.</p>
+	</item>
+	
+	<tag><marker id="hs_data_f_recv"/><c>f_recv</c></tag>
+	<item>
+	  <p>
+	    A fun with the following signature:
+	  </p>
+	  <code type="none"><![CDATA[fun (DistCtrlr, Length) -> {ok, Packet} | {error, Reason}]]></code>
+	  <p>
+	    where <c>DistCtrlr</c> is the identifier of the distribution
+	    controller.
+	    If <c>Length</c> is <c>0</c>, all available bytes should be
+	    returned. If <c>Length > 0</c>, exactly <c>Length</c> bytes
+	    should be returned, or an error; possibly discarding less
+	    than <c>Length</c> bytes of data when the connection is
+	    closed from the other side.
+	    It is used for passive receive of data from the
+	    other end.
+	  </p>
+	  <p>Only used during handshake phase.</p>
+	</item>
+
+	<tag><marker id="hs_data_f_setopts_pre_nodeup"/><c>f_setopts_pre_nodeup</c></tag>
+	<item>
+	  <p>
+	    A fun with the following signature:
+	  </p>
+	  <code type="none"><![CDATA[fun (DistCtrlr) -> ok | {error, Error}]]></code>
+	  <p>
+	    where <c>DistCtrlr</c> is the identifier of
+	    the distribution controller. Called just
+	    before the distribution channel is taken up
+	    for normal traffic.
+	  </p>
+	  <p>Only used during handshake phase.</p>
+	</item>
+
+	<tag><marker id="hs_data_f_setopts_post_nodeup"/><c>f_setopts_post_nodeup</c></tag>
+	<item>
+	  <p>
+	    A fun with the following signature:
+	  </p>
+	  <code type="none"><![CDATA[fun (DistCtrlr) -> ok | {error, Error}]]></code>
+	  <p>
+	    where <c>DistCtrlr</c> is the identifier of
+	    the distribution controller. Called just
+	    after distribution channel has been taken
+	    up for normal traffic.
+	  </p>
+	  <p>Only used during handshake phase.</p>
+	</item>
+
+	<tag><marker id="hs_data_f_getll"/><c>f_getll</c></tag>
+	<item>
+	  <p>
+	    A fun with the following signature:
+	  </p>
+	  <code type="none"><![CDATA[fun (DistCtrlr) -> ID]]></code>
+	  <p>
+	    where <c>DistCtrlr</c> is the identifier of
+	    the distribution controller and <c>ID</c> is
+	    the identifier of the low level entity that
+	    handles the connection (often <c>DistCtrlr</c>
+	    itself).
+	  </p>
+	  <p>Only used during handshake phase.</p>
+	</item>
+
+	<tag><marker id="hs_data_f_address"/><c>f_address</c></tag>
+	<item>
+	  <p>
+	    A fun with the following signature:
+	  </p>
+	  <code type="none"><![CDATA[fun (DistCtrlr, Node) -> NetAddress]]></code>
+	  <p>
+	    where <c>DistCtrlr</c> is the identifier of
+	    the distribution controller, <c>Node</c>
+	    is the node name of the node on the other end,
+	    and <c>NetAddress</c> is a <c>#net_address{}</c>
+	    record with information about the address
+	    for the <c>Node</c> on the other end of the
+	    connection. The <c>#net_address{}</c> record
+	    is defined in
+	    <c>kernel/include/net_address.hrl</c>.
+	  </p>
+	  <p>Only used during handshake phase.</p>
+	</item>
+
+	<tag><marker id="hs_data_mf_tick"/><c>mf_tick</c></tag>
+	<item>
+	  <p>
+	    A fun with the following signature:
+	  </p>
+	  <code type="none"><![CDATA[fun (DistCtrlr) -> void()]]></code>
+	  <p>
+	    where <c>DistCtrlr</c> is the identifier
+	    of the distribution controller. This
+	    function should send information over
+	    the connection that is not interpreted
+	    by the other end while increasing the
+	    statistics of received packets on the
+	    other end. This is usually implemented by
+	    sending an empty packet.
+	  </p>
+	  <note><p>
+	    It is of vital importance that this operation
+	    does not block the caller for a long time.
+	    This since it is called from the connection
+	    supervisor.
+	  </p></note>
+	  <p>Used when connection is up.</p>
+	</item>
+
+	<tag><marker id="hs_data_mf_getstat"/><c>mf_getstat</c></tag>
+	<item>
+	  <p>
+	    A fun with the following signature:
+	  </p>
+	  <code type="none"><![CDATA[fun (DistCtrlr) -> {ok, Received, Sent, PendSend}]]></code>
+	  <p>
+	    where <c>DistCtrlr</c> is the identifier
+	    of the distribution controller, <c>Received</c>
+	    is received packets, <c>Sent</c> is
+	    sent packets, and <c>PendSend</c> is
+	    amount of packets in queue to be sent
+	    or a <c>boolean()</c> indicating whether
+	    there are packets in queue to be sent.
+	  </p>
+	  <note><p>
+	    It is of vital importance that this operation
+	    does not block the caller for a long time.
+	    This since it is called from the connection
+	    supervisor.
+	  </p></note>
+	  <p>Used when connection is up.</p>
+	</item>
+
+	<tag><marker id="hs_data_request_type"/><c>request_type</c></tag>
+	<item>
+	  <p>
+	    The request <c>Type</c> as passed to
+	    <seealso marker="#setup"><c>setup/5</c></seealso>.
+	    This is only mandatory when the connection has
+	    been initiated by this node. That is, the connection
+	    is set up via <c>setup/5</c>.
+	  </p>
+	</item>
+
+	<tag><marker id="hs_data_mf_setopts"/><c>mf_setopts</c></tag>
+	<item>
+	  <p>
+	    A fun with the following signature:
+	  </p>
+	  <code type="none"><![CDATA[fun (DistCtrl, Opts) -> ok | {error, Error}]]></code>
+	  <p>
+	    where <c>DistCtrlr</c> is the identifier
+	    of the distribution controller and <c>Opts</c>
+	    is a list of options to set on the connection.
+	  </p>
+	  <p>This function is optional. Used when connection is up.</p>
+	</item>
+	
+	<tag><marker id="hs_data_mf_getopts"/><c>mf_getopts</c></tag>
+	<item>
+	  <p>
+	    A fun with the following signature:
+	  </p>
+	  <code type="none"><![CDATA[fun (DistCtrl, Opts) -> {ok, OptionValues} | {error, Error}]]></code>
+	  <p>
+	    where <c>DistCtrlr</c> is the identifier
+	    of the distribution controller and <c>Opts</c>
+	    is a list of options to read for the connection.
+	  </p>
+	  <p>This function is optional. Used when connection is up.</p>
+	</item>
+
+	<tag><marker id="hs_data_f_handshake_complete"/><c>f_handshake_complete</c></tag>
+	<item>
+	  <p>
+	    A fun with the following signature:
+	  </p>
+	  <code type="none"><![CDATA[fun (DistCtrlr, Node, DHandle) -> void()]]></code>
+	  <p>
+	    where <c>DistCtrlr</c> is the identifier
+	    of the distribution controller, <c>Node</c> is
+	    the node name of the node connected at the other
+	    end, and <c>DHandle</c> is a distribution handle
+	    needed by a distribution controller process when
+	    calling the following BIFs:
+	  </p>
+	  <list>
+	    <item><p><seealso marker="erts:erlang#dist_ctrl_get_data/1"><c>erlang:dist_ctrl_get_data/1</c></seealso></p></item>
+	    <item><p><seealso marker="erts:erlang#dist_ctrl_get_data_notification/1"><c>erlang:dist_ctrl_get_data_notification/1</c></seealso></p></item>
+	    <item><p><seealso marker="erts:erlang#dist_ctrl_input_handler/2"><c>erlang:dist_ctrl_input_handler/2</c></seealso></p></item>
+	    <item><p><seealso marker="erts:erlang#dist_ctrl_put_data/2"><c>erlang:dist_ctrl_put_data/2</c></seealso></p></item>
+	  </list>
+	  <p>
+	    This function is called when the handshake has
+	    completed and the distribution channel is up.
+	    The distribution controller can begin dispatching
+	    traffic over the channel. This function is optional.
+	  </p>
+	  <p>Only used during handshake phase.</p>
+	</item>
+	
+	<tag><marker id="hs_data_add_flags"/><c>add_flags</c></tag>
+	<item>
+	  <p>
+	    <seealso marker="erl_dist_protocol#dflags">Distribution flags</seealso>
+	    to add to the connection. Currently all (non obsolete) flags will
+	    automatically be enabled.
+	  </p>
+	  <p>
+	    This flag field is optional.
+	  </p>
+	</item>
+
+	<tag><marker id="hs_data_reject_flags"/><c>reject_flags</c></tag>
+	<item>
+	  <p>
+	    <seealso marker="erl_dist_protocol#dflags">Distribution flags</seealso>
+	    to reject. Currently the following distribution flags can be rejected:
+	  </p>
+	  <taglist>
+	    <tag><c>DFLAG_DIST_HDR_ATOM_CACHE</c></tag>
+	    <item>Do not use atom cache over this connection.</item>
+	    <tag><c>DFLAGS_STRICT_ORDER_DELIVERY</c></tag>
+	    <item>Do not use any features that require strict
+	    order delivery.</item>
+	  </taglist>
+	  <p>
+	    This flag field is optional.
+	  </p>
+	</item>
+
+	<tag><marker id="hs_data_require_flags"/><c>require_flags</c></tag>
+	<item>
+	  <p>
+	    Require these <seealso marker="erl_dist_protocol#dflags">distribution
+	    flags</seealso> to be used. The connection will be aborted during the
+	    handshake if the other end does not use them.
+	  </p>
+	  <p>
+	    This flag field is optional.
+	  </p>
+	</item>
+
+      </taglist>
+    </section>
+
+    <section>
+      <marker id="distribution_data_delivery"/>
+      <title>Distribution Data Delivery</title>
+      <p>
+	When using the default configuration, the data to pass
+	over a connection needs to be delivered as is
+	to the node on the receiving end in the <em>exact same
+	order</em>, with no loss of data what so ever, as sent
+	from the sending node.
+      </p>
+      <p>
+	The data delivery order can be relaxed by disabling
+	features that require strict ordering. This is done by
+	passing the <c>?DFLAGS_STRICT_ORDER_DELIVERY</c>
+	<seealso marker="erl_dist_protocol#dflags">distribution
+	flags</seealso> in the
+	<seealso marker="alt_dist#hs_data_reject_flags"><c>reject_flags</c></seealso>
+	field of the <seealso marker="#hs_data_record"><c>#hs_data{}</c></seealso>
+	record used when setting up the connection. When relaxed
+	ordering is used, only the order of signals with the same
+	sender/receiver pair has to be preserved.
+	However, note that disabling the features that require
+	strict ordering may have a negative impact on performance,
+	throughput, and/or latency. 
+      </p>
+    </section>
+
+    <section>
+      <marker id="enable_your_distribution_module"/>
+      <title>Enable Your Distribution Module</title>
+
+      <p>For <c>net_kernel</c> to find out which distribution module to use,
+      the <c>erl</c> command-line argument <c>-proto_dist</c> is used. It
+      is followed by one or more distribution module names, with suffix
+      "_dist" removed. That is, <c>gen_tcp_dist</c> as a distribution module
+      is specified as <c>-proto_dist gen_tcp</c>.</p>
+
+      <p>If no <c>epmd</c> (TCP port mapper daemon) is used, also command-line
+      option <c>-no_epmd</c> is to be specified, which makes
+      Erlang skip the <c>epmd</c> startup, both as an OS process and as an
+      Erlang ditto.</p>
+    </section>
+
+  </section>
+
+  <section>
     <title>The Driver</title>
+
+    <note>
+      <p>This section was written a long time ago. Most of it is still
+      valid, but some things have changed since then. Some updates have
+      been made to the documentation of the driver presented here,
+      but more can be done and is planned for the future.
+      The reader is encouraged to read the
+      <seealso marker="erl_driver"><c>erl_driver</c></seealso> and
+      <seealso marker="driver_entry"><c>driver_entry</c></seealso>
+      documentation also.</p>
+    </note>
+
     <p>Although Erlang drivers in general can be beyond the scope of this
       section, a brief introduction seems to be in place.</p>
 
diff --git a/erts/doc/src/erl_dist_protocol.xml b/erts/doc/src/erl_dist_protocol.xml
index 610351db6c..a78b13aaa4 100644
--- a/erts/doc/src/erl_dist_protocol.xml
+++ b/erts/doc/src/erl_dist_protocol.xml
@@ -829,7 +829,31 @@ DiB == gen_digest(ChA, ICA)?
         <item>
           <p>The node understand UTF-8 encoded atoms.</p>
         </item>
+        <tag><c>-define(DFLAG_MAP_TAG, 16#20000).</c></tag>
+        <item>
+          <p>The node understand the map tag.</p>
+        </item>
+        <tag><c>-define(DFLAG_BIG_CREATION, 16#40000).</c></tag>
+        <item>
+          <p>The node understand big node creation.</p>
+        </item>
+        <tag><c>-define(DFLAG_SEND_SENDER, 16#80000).</c></tag>
+        <item>
+          <p>
+	    Use the <c>SEND_SENDER</c>
+	    <seealso marker="#control_message">control message</seealso>
+	    instead of the <c>SEND</c> control message and use the
+	    <c>SEND_SENDER_TT</c> control message instead
+	    of the <c>SEND_TT</c> control message.
+	  </p>
+        </item>
       </taglist>
+      <p>
+	There are also a collection of <c>DFLAG</c>s bitwise or:ed
+	together in the <c>DFLAGS_STRICT_ORDER_DELIVERY</c> macro.
+	These flags corresponds to features that require strict
+	ordering of data over distribution channels.
+      </p>
     </section>
   </section>
 
@@ -922,6 +946,7 @@ DiB == gen_digest(ChA, ICA)?
       </item>
     </taglist>
 
+    <marker id="control_message"/>
     <p>The <c>ControlMessage</c> is a tuple, where the first element indicates
       which distributed operation it encodes:</p>
 
@@ -1028,4 +1053,49 @@ DiB == gen_digest(ChA, ICA)?
       </item>
     </taglist>
   </section>
+
+  <section>
+    <title>New Ctrlmessages for Erlang/OTP 21</title>
+    <taglist>
+      <tag><c>SEND_SENDER</c></tag>
+      <item>
+        <p><c>{22, FromPid, ToPid}</c></p>
+        <p>Followed by <c>Message</c>.</p>
+	<p>
+	  This control messages replace the <c>SEND</c> control
+	  message and will be sent when the distribution flag
+	  <seealso marker="erl_dist_protocol#dflags"><c>DFLAG_SEND_SENDER</c></seealso>
+	  has been negotiated in the connection setup handshake.
+	</p>
+	<note><p>
+	  Messages encoded before the connection has
+	  been set up may still use the <c>SEND</c> control
+	  message. However, once a <c>SEND_SENDER</c> or <c>SEND_SENDER_TT</c>
+	  control message has been sent, no more <c>SEND</c>
+	  control messages will be sent in the same direction
+	  on the connection.
+	</p></note>
+      </item>
+      <tag><c>SEND_SENDER_TT</c></tag>
+      <item>
+        <p><c>{23, FromPid, ToPid, TraceToken}</c></p>
+        <p>Followed by <c>Message</c>.</p>
+	<p>
+	  This control messages replace the <c>SEND_TT</c> control
+	  message and will be sent when the distribution flag
+	  <seealso marker="erl_dist_protocol#dflags"><c>DFLAG_SEND_SENDER</c></seealso>
+	  has been negotiated in the connection setup handshake.
+	</p>
+	<note><p>
+	  Messages encoded before the connection has
+	  been set up may still use the <c>SEND_TT</c> control
+	  message. However, once a <c>SEND_SENDER</c> or <c>SEND_SENDER_TT</c>
+	  control message has been sent, no more <c>SEND_TT</c>
+	  control messages will be sent in the same direction
+	  on the connection.
+	</p></note>
+      </item>
+    </taglist>
+  </section>
+
 </chapter>
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml
index 5664609f60..797b36bf13 100644
--- a/erts/doc/src/erlang.xml
+++ b/erts/doc/src/erlang.xml
@@ -181,6 +181,14 @@
 	</taglist>
       </desc>
     </datatype>
+
+    <datatype>
+      <name name="dist_handle"></name>
+      <desc>
+        <p>An opaque handle identifing a distribution channel.</p>
+      </desc>
+    </datatype>
+
   </datatypes>
 
   <funcs>
@@ -1215,6 +1223,141 @@ end</code>
     </func>
 
     <func>
+      <name name="dist_ctrl_get_data" arity="1"/>
+      <fsummary>Get distribution channel data to pass to another node.</fsummary>
+      <desc>
+        <p>
+	  Get distribution channel data from the local node that is
+	  to be passed to the remote node. The distribution channel
+	  is identified by <c><anno>DHandle</anno></c>. If no data
+	  is available, the atom <c>none</c> is returned. One
+	  can request to be informed by a message when more
+	  data is available by calling
+	  <seealso marker="erlang#dist_ctrl_get_data_notification/1"><c>erlang:dist_ctrl_get_data_notification(DHandle)</c></seealso>.
+	</p>
+	<note><p>
+	  Only the process registered as distribution
+	  controller for the distribution channel identified by
+	  <c><anno>DHandle</anno></c> is allowed to call this
+	  function.
+	</p></note>
+	<p>
+	  This function is used when implementing an alternative
+	  distribution carrier using processes as distribution
+	  controllers. <c><anno>DHandle</anno></c> is retrived
+	  via the callback
+	  <seealso marker="erts:alt_dist#hs_data_f_handshake_complete"><c>f_handshake_complete</c></seealso>.
+	  More information can be found in the documentation of
+	  <seealso marker="erts:alt_dist#distribution_module">ERTS
+	  User's Guide ➜ How to implement an Alternative Carrier
+	  for the Erlang Distribution ➜ Distribution Module</seealso>.
+	</p>
+      </desc>
+    </func>
+
+    <func>
+      <name name="dist_ctrl_get_data_notification" arity="1"/>
+      <fsummary>Request notification about available outgoing distribution channel data.</fsummary>
+      <desc>
+        <p>
+	  Request notification when more data is available to
+	  fetch using
+	  <seealso marker="erlang#dist_ctrl_get_data/1"><c>erlang:dist_ctrl_get_data(DHandle)</c></seealso>
+	  for the distribution channel identified by
+	  <c><anno>DHandle</anno></c>. When more data is present,
+	  the caller will be sent the message <c>dist_data</c>.
+	  Once a <c>dist_data</c> messages has been sent, no
+	  more <c>dist_data</c> messages will be sent until
+	  the <c>dist_ctrl_get_data_notification/1</c> function has been called
+	  again.
+	</p>
+	<note><p>
+	  Only the process registered as distribution
+	  controller for the distribution channel identified by
+	  <c><anno>DHandle</anno></c> is allowed to call this
+	  function.
+	</p></note>
+	<p>
+	  This function is used when implementing an alternative
+	  distribution carrier using processes as distribution
+	  controllers. <c><anno>DHandle</anno></c> is retrived
+	  via the callback
+	  <seealso marker="erts:alt_dist#hs_data_f_handshake_complete"><c>f_handshake_complete</c></seealso>.
+	  More information can be found in the documentation of
+	  <seealso marker="erts:alt_dist#distribution_module">ERTS
+	  User's Guide ➜ How to implement an Alternative Carrier
+	  for the Erlang Distribution ➜ Distribution Module</seealso>.
+	</p>
+      </desc>
+    </func>
+
+    <func>
+      <name name="dist_ctrl_input_handler" arity="2"/>
+      <fsummary>Register distribution channel input handler process.</fsummary>
+      <desc>
+        <p>
+	  Register an alternate input handler process for the
+	  distribution channel identified by <c><anno>DHandle</anno></c>.
+	  Once this function has been called, <c><anno>InputHandler</anno></c>
+	  is the only process allowed to call
+	  <seealso marker="erlang#dist_ctrl_put_data/2"><c>erlang:dist_ctrl_put_data(DHandle, Data)</c></seealso>
+	  with the <c><anno>DHandle</anno></c> identifing this distribution
+	  channel.
+	</p>
+	<note><p>
+	  Only the process registered as distribution
+	  controller for the distribution channel identified by
+	  <c><anno>DHandle</anno></c> is allowed to call this
+	  function.
+	</p></note>
+	<p>
+	  This function is used when implementing an alternative
+	  distribution carrier using processes as distribution
+	  controllers. <c><anno>DHandle</anno></c> is retrived
+	  via the callback
+	  <seealso marker="erts:alt_dist#hs_data_f_handshake_complete"><c>f_handshake_complete</c></seealso>.
+	  More information can be found in the documentation of
+	  <seealso marker="erts:alt_dist#distribution_module">ERTS
+	  User's Guide ➜ How to implement an Alternative Carrier
+	  for the Erlang Distribution ➜ Distribution Module</seealso>.
+	</p>
+      </desc>
+    </func>
+
+    <func>
+      <name name="dist_ctrl_put_data" arity="2"/>
+      <fsummary>Pass data into the VM from a distribution channel.</fsummary>
+      <desc>
+        <p>
+	  Deliver distribution channel data from a remote node to the
+	  local node.
+	</p>
+	<note><p>
+	  Only the process registered as distribution
+	  controller for the distribution channel identified by
+	  <c><anno>DHandle</anno></c> is allowed to call this
+	  function unless an alternate input handler process
+	  has been registered using
+	  <seealso marker="erlang#dist_ctrl_input_handler/2"><c>erlang:dist_ctrl_input_handler(DHandle, InputHandler)</c></seealso>.
+	  If an alternate input handler has been registered, only
+	  the registered input handler process is allowed to call
+	  this function.
+	</p></note>
+	<p>
+	  This function is used when implementing an alternative
+	  distribution carrier using processes as distribution
+	  controllers. <c><anno>DHandle</anno></c> is retrived
+	  via the callback
+	  <seealso marker="erts:alt_dist#hs_data_f_handshake_complete"><c>f_handshake_complete</c></seealso>.
+	  More information can be found in the documentation of
+	  <seealso marker="erts:alt_dist#distribution_module">ERTS
+	  User's Guide ➜ How to implement an Alternative Carrier
+	  for the Erlang Distribution ➜ Distribution Module</seealso>.
+	</p>
+      </desc>
+    </func>
+
+    <func>
       <name name="element" arity="2"/>
       <fsummary>Return the Nth element of a tuple.</fsummary>
       <type_desc variable="N">1..tuple_size(<anno>Tuple</anno>)</type_desc>
diff --git a/erts/emulator/beam/atom.names b/erts/emulator/beam/atom.names
index a44d23b181..fc55b687d4 100644
--- a/erts/emulator/beam/atom.names
+++ b/erts/emulator/beam/atom.names
@@ -217,6 +217,8 @@ atom discard
 atom display_items
 atom dist
 atom dist_cmd
+atom dist_ctrl_put_data
+atom dist_data
 atom Div='/'
 atom div
 atom dlink
diff --git a/erts/emulator/beam/bif.c b/erts/emulator/beam/bif.c
index 7e26af5abd..cbbc2e88a1 100644
--- a/erts/emulator/beam/bif.c
+++ b/erts/emulator/beam/bif.c
@@ -437,7 +437,6 @@ BIF_RETTYPE demonitor(Process *c_p, Eterm ref, Eterm *multip)
    ErtsMonitor  *mon = NULL;  /* The monitor entry to delete */
    Eterm        to = NIL;     /* Monitor link traget */
    DistEntry    *dep = NULL;  /* Target's distribution entry */
-   int          deref_de = 0;
    BIF_RETTYPE  res = am_false;
    int          unlock_link = 1;
 
@@ -467,8 +466,6 @@ BIF_RETTYPE demonitor(Process *c_p, Eterm ref, Eterm *multip)
            ASSERT(is_node_name_atom(to));
            dep = erts_sysname_to_connected_dist_entry(to);
            ASSERT(dep != erts_this_dist_entry);
-           if (dep)
-               deref_de = 1;
        } else if (is_port(to)) {
            if (port_dist_entry(to) != erts_this_dist_entry) {
                goto badarg;
@@ -486,11 +483,6 @@ BIF_RETTYPE demonitor(Process *c_p, Eterm ref, Eterm *multip)
            unlock_link = 0;
        }
        else { /* Local monitor */
-           if (deref_de) {
-               deref_de = 0;
-               erts_deref_dist_entry(dep);
-           }
-           dep = NULL;
            demonitor_local_process(c_p, ref, to, &res);
        }
        break;
@@ -505,11 +497,6 @@ done:
    if (unlock_link)
        erts_proc_unlock(c_p, ERTS_PROC_LOCK_LINK);
 
-   if (deref_de) {
-       ASSERT(dep);
-       erts_deref_dist_entry(dep);
-   }
-
    ERTS_LC_ASSERT(ERTS_PROC_LOCK_MAIN == erts_proc_lc_my_proc_locks(c_p));
    BIF_RET(res);
 }
@@ -844,7 +831,6 @@ BIF_RETTYPE monitor_2(BIF_ALIST_2)
     Eterm target = BIF_ARG_2;
     BIF_RETTYPE ret;
     DistEntry  *dep = NULL; 
-    int deref_de = 0;
 
     /* Only process monitors are implemented */
     switch (BIF_ARG_1) {
@@ -904,21 +890,14 @@ local_port:
 	}
 	dep = erts_sysname_to_connected_dist_entry(remote_node);
 	if (dep == erts_this_dist_entry) {
-	    deref_de = 1;
             ret = local_name_monitor(BIF_P, BIF_ARG_1, name);
 	} else {
-	    if (dep)
-		deref_de = 1;
 	    ret = remote_monitor(BIF_P, BIF_ARG_1, BIF_ARG_2, dep, name, 1);
 	}
     } else {
 badarg:
 	ERTS_BIF_PREP_ERROR(ret, BIF_P, BADARG);
     }
-    if (deref_de) {
-	deref_de = 0;
-	erts_deref_dist_entry(dep);
-    }
 
     return ret;
 }
@@ -2000,6 +1979,7 @@ static Sint remote_send(Process *p, DistEntry *dep,
 
     ASSERT(is_atom(to) || is_external_pid(to));
 
+    ctx->dep = dep;
     code = erts_dsig_prepare(&ctx->dsd, dep, p, ERTS_DSP_NO_LOCK, !ctx->suspend);
     switch (code) {
     case ERTS_DSIG_PREP_NOT_ALIVE:
@@ -2201,7 +2181,6 @@ do_send(Process *p, Eterm to, Eterm msg, Eterm *refp, ErtsSendContext *ctx)
 
 	if (dep == erts_this_dist_entry) {
 	    Eterm id;
-	    erts_deref_dist_entry(dep);
 	    if (IS_TRACED_FL(p, F_TRACE_SEND))
 		trace_send(p, to, msg);
 	    if (ERTS_PROC_GET_SAVED_CALLS_BUF(p))
@@ -2224,11 +2203,9 @@ do_send(Process *p, Eterm to, Eterm msg, Eterm *refp, ErtsSendContext *ctx)
 	}
 
 	ret = remote_send(p, dep, tp[1], to, msg, ctx);
-	if (ret != SEND_YIELD_CONTINUE) {
-	    if (dep) {
-		erts_deref_dist_entry(dep);
-	    }
-	} else {
+	if (ret == SEND_YIELD_CONTINUE) {
+            if (dep)
+                erts_ref_dist_entry(dep);
 	    ctx->dep_to_deref = dep;
 	}
 	return ret;
@@ -4164,7 +4141,6 @@ BIF_RETTYPE list_to_pid_1(BIF_ALIST_1)
 	goto bad;
 
     if(dep == erts_this_dist_entry) {
-	erts_deref_dist_entry(dep);
 	BIF_RET(make_internal_pid(make_pid_data(c, b)));
     }
     else {
@@ -4184,13 +4160,10 @@ BIF_RETTYPE list_to_pid_1(BIF_ALIST_1)
       etp->data.ui[0] = make_pid_data(c, b);
 
       MSO(BIF_P).first = (struct erl_off_heap_header*) etp;
-      erts_deref_dist_entry(dep);
       BIF_RET(make_external_pid(etp));
     }
 
  bad:
-    if (dep)
-	erts_deref_dist_entry(dep);
     if (buf)
 	erts_free(ERTS_ALC_T_TMP, (void *) buf);
     BIF_ERROR(BIF_P, BADARG);
@@ -4235,7 +4208,6 @@ BIF_RETTYPE list_to_port_1(BIF_ALIST_1)
 	goto bad;
 
     if(dep == erts_this_dist_entry) {
-	erts_deref_dist_entry(dep);
 	BIF_RET(make_internal_port(p));
     }
     else {
@@ -4255,13 +4227,10 @@ BIF_RETTYPE list_to_port_1(BIF_ALIST_1)
       etp->data.ui[0] = p;
 
       MSO(BIF_P).first = (struct erl_off_heap_header*) etp;
-      erts_deref_dist_entry(dep);
       BIF_RET(make_external_port(etp));
     }
 
  bad:
-    if (dep)
-	erts_deref_dist_entry(dep);
     BIF_ERROR(BIF_P, BADARG);
 }
 
@@ -4381,12 +4350,9 @@ BIF_RETTYPE list_to_ref_1(BIF_ALIST_1)
       res = make_external_ref(etp);
     }
 
-    erts_deref_dist_entry(dep);
     BIF_RET(res);
 
  bad:
-    if (dep)
-	erts_deref_dist_entry(dep);
     BIF_ERROR(BIF_P, BADARG);
 }
 
diff --git a/erts/emulator/beam/bif.tab b/erts/emulator/beam/bif.tab
index 962b00ae7b..2f7927d685 100644
--- a/erts/emulator/beam/bif.tab
+++ b/erts/emulator/beam/bif.tab
@@ -154,6 +154,12 @@ bif erlang:spawn_opt/1
 bif erlang:setnode/2
 bif erlang:setnode/3
 bif erlang:dist_exit/3
+bif erlang:dist_get_stat/1
+bif erlang:dist_ctrl_input_handler/2
+bif erlang:dist_ctrl_put_data/2
+bif erlang:dist_ctrl_get_data/1
+bif erlang:dist_ctrl_get_data_notification/1
+
 
 # Static native functions in erts_internal
 bif erts_internal:port_info/1
diff --git a/erts/emulator/beam/dist.c b/erts/emulator/beam/dist.c
index 491c4d378e..10ec275922 100644
--- a/erts/emulator/beam/dist.c
+++ b/erts/emulator/beam/dist.c
@@ -121,7 +121,7 @@ Export* dexit_trap = NULL;
 Export* dmonitor_p_trap = NULL;
 
 /* local variables */
-
+static Export *dist_ctrl_put_data_trap;
 
 /* forward declarations */
 
@@ -156,9 +156,7 @@ create_cache(DistEntry *dep)
     int i;
     ErtsAtomCache *cp;
 
-    ERTS_LC_ASSERT(
-	is_internal_port(dep->cid)
-	&& erts_lc_is_port_locked(erts_port_lookup_raw(dep->cid)));
+    ERTS_LC_ASSERT(is_nil(dep->cid));
     ASSERT(!dep->cache);
 
     dep->cache = cp = (ErtsAtomCache*) erts_alloc(ERTS_ALC_T_DCACHE,
@@ -176,11 +174,13 @@ Uint erts_dist_cache_size(void)
 }
 
 static ErtsProcList *
-get_suspended_on_de(DistEntry *dep, Uint32 unset_qflgs)
+get_suspended_on_de(DistEntry *dep, erts_aint32_t unset_qflgs)
 {
+    erts_aint32_t qflgs;
     ERTS_LC_ASSERT(erts_lc_mtx_is_locked(&dep->qlock));
-    dep->qflgs &= ~unset_qflgs;
-    if (dep->qflgs & ERTS_DE_QFLG_EXIT) {
+    qflgs = erts_atomic32_read_band_acqb(&dep->qflgs, ~unset_qflgs);
+    qflgs &= ~unset_qflgs;
+    if (qflgs & ERTS_DE_QFLG_EXIT) {
 	/* No resume when exit has been scheduled */
 	return NULL;
     }
@@ -446,7 +446,35 @@ inc_no_nodes(void)
 #endif
     erts_atomic_inc_mb(&no_nodes);
 }
-	
+
+static void
+kill_dist_ctrl_proc(void *vpid)
+{
+    Eterm pid = (Eterm) vpid;
+    ErtsProcLocks rp_locks = ERTS_PROC_LOCKS_XSIG_SEND;
+    Process *rp = erts_pid2proc(NULL, 0, pid, rp_locks);
+    if (rp) {
+        erts_send_exit_signal(NULL, rp->common.id, rp, &rp_locks,
+                              am_kill, NIL, NULL, 0);
+        if (rp_locks)
+            erts_proc_unlock(rp, rp_locks);
+    }
+}
+
+static void
+schedule_kill_dist_ctrl_proc(Eterm pid)
+{
+    ErtsSchedulerData *esdp = erts_get_scheduler_data();
+    int sched_id = 1;
+    if (!esdp || ERTS_SCHEDULER_IS_DIRTY(esdp))
+        sched_id = 1;
+    else
+        sched_id = (int) esdp->no;
+    erts_schedule_misc_aux_work(sched_id,
+                                kill_dist_ctrl_proc,
+                                (void *) (UWord) pid);
+}
+
 /*
  * proc is currently running or exiting process.
  */
@@ -456,58 +484,62 @@ int erts_do_net_exits(DistEntry *dep, Eterm reason)
 
     if (dep == erts_this_dist_entry) {  /* Net kernel has died (clean up!!) */
 	DistEntry *tdep;
-	int no_dist_port = 0;
+	int no_dist_ctrl = 0;
 	Eterm nd_reason = (reason == am_no_network
 			   ? am_no_network
 			   : am_net_kernel_terminated);
 	erts_rwmtx_rlock(&erts_dist_table_rwmtx);
 
 	for (tdep = erts_hidden_dist_entries; tdep; tdep = tdep->next)
-	    no_dist_port++;
+	    no_dist_ctrl++;
 	for (tdep = erts_visible_dist_entries; tdep; tdep = tdep->next)
-	    no_dist_port++;
+	    no_dist_ctrl++;
 
 	/* KILL all port controllers */
-	if (no_dist_port == 0)
+	if (no_dist_ctrl == 0)
 	    erts_rwmtx_runlock(&erts_dist_table_rwmtx);
 	else {
 	    Eterm def_buf[128];
 	    int i = 0;
-	    Eterm *dist_port;
+	    Eterm *dist_ctrl;
 
-	    if (no_dist_port <= sizeof(def_buf)/sizeof(def_buf[0]))
-		dist_port = &def_buf[0];
+	    if (no_dist_ctrl <= sizeof(def_buf)/sizeof(def_buf[0]))
+		dist_ctrl = &def_buf[0];
 	    else
-		dist_port = erts_alloc(ERTS_ALC_T_TMP,
-				       sizeof(Eterm)*no_dist_port);
+		dist_ctrl = erts_alloc(ERTS_ALC_T_TMP,
+				       sizeof(Eterm)*no_dist_ctrl);
 	    for (tdep = erts_hidden_dist_entries; tdep; tdep = tdep->next) {
-		ASSERT(is_internal_port(tdep->cid));
-		dist_port[i++] = tdep->cid;
+		ASSERT(is_internal_port(tdep->cid) || is_internal_pid(tdep->cid));
+		dist_ctrl[i++] = tdep->cid;
 	    }
 	    for (tdep = erts_visible_dist_entries; tdep; tdep = tdep->next) {
-		ASSERT(is_internal_port(tdep->cid));
-		dist_port[i++] = tdep->cid;
+		ASSERT(is_internal_port(tdep->cid) || is_internal_pid(tdep->cid));
+		dist_ctrl[i++] = tdep->cid;
 	    }
 	    erts_rwmtx_runlock(&erts_dist_table_rwmtx);
 
-	    for (i = 0; i < no_dist_port; i++) {
-		Port *prt = erts_port_lookup(dist_port[i],
-					     ERTS_PORT_SFLGS_INVALID_LOOKUP);
-		if (!prt)
-		    continue;
-		ASSERT(erts_atomic32_read_nob(&prt->state)
-		       & ERTS_PORT_SFLG_DISTRIBUTION);
-
-		erts_port_exit(NULL, ERTS_PORT_SIG_FLG_FORCE_SCHED,
-			       prt, dist_port[i], nd_reason, NULL);
+	    for (i = 0; i < no_dist_ctrl; i++) {
+                if (is_internal_pid(dist_ctrl[i]))
+                    schedule_kill_dist_ctrl_proc(dist_ctrl[i]);
+                else {
+                    Port *prt = erts_port_lookup(dist_ctrl[i],
+                                                 ERTS_PORT_SFLGS_INVALID_LOOKUP);
+                    if (prt) {
+                        ASSERT(erts_atomic32_read_nob(&prt->state)
+                               & ERTS_PORT_SFLG_DISTRIBUTION);
+
+                        erts_port_exit(NULL, ERTS_PORT_SIG_FLG_FORCE_SCHED,
+                                       prt, dist_ctrl[i], nd_reason, NULL);
+                    }
+                }
 	    }
 
-	    if (dist_port != &def_buf[0])
-		erts_free(ERTS_ALC_T_TMP, dist_port);
+	    if (dist_ctrl != &def_buf[0])
+		erts_free(ERTS_ALC_T_TMP, dist_ctrl);
 	}
 
 	/*
-	 * When last dist port exits, node will be taken
+	 * When last dist ctrl exits, node will be taken
 	 * from alive to not alive.
 	 */
 	ASSERT(is_nil(nodedown.reason) && !nodedown.bp);
@@ -524,7 +556,7 @@ int erts_do_net_exits(DistEntry *dep, Eterm reason)
 					  &nodedown.bp->off_heap);
 	}
     }
-    else { /* Call from distribution port */
+    else { /* Call from distribution controller (port/process) */
 	NetExitsContext nec = {dep};
 	ErtsLink *nlinks;
 	ErtsLink *node_links;
@@ -534,24 +566,23 @@ int erts_do_net_exits(DistEntry *dep, Eterm reason)
 	erts_atomic_set_mb(&dep->dist_cmd_scheduled, 1);
 	erts_de_rwlock(dep);
 
-	ERTS_LC_ASSERT(is_internal_port(dep->cid)
-			   && erts_lc_is_port_locked(erts_port_lookup_raw(dep->cid)));
+        if (is_internal_port(dep->cid)) {
+            ERTS_LC_ASSERT(erts_lc_is_port_locked(erts_port_lookup_raw(dep->cid)));
 
-	if (erts_port_task_is_scheduled(&dep->dist_cmd))
-	    erts_port_task_abort(&dep->dist_cmd);
+            if (erts_port_task_is_scheduled(&dep->dist_cmd))
+                erts_port_task_abort(&dep->dist_cmd);
+        }
 
 	if (dep->status & ERTS_DE_SFLG_EXITING) {
 #ifdef DEBUG
-	    erts_mtx_lock(&dep->qlock);
-	    ASSERT(dep->qflgs & ERTS_DE_QFLG_EXIT);
-	    erts_mtx_unlock(&dep->qlock);
+	    ASSERT(erts_atomic32_read_nob(&dep->qflgs) & ERTS_DE_QFLG_EXIT);
 #endif
 	}
 	else {
 	    dep->status |= ERTS_DE_SFLG_EXITING;
 	    erts_mtx_lock(&dep->qlock);
-	    ASSERT(!(dep->qflgs & ERTS_DE_QFLG_EXIT));
-	    dep->qflgs |= ERTS_DE_QFLG_EXIT;
+	    ASSERT(!(erts_atomic32_read_nob(&dep->qflgs) & ERTS_DE_QFLG_EXIT));
+	    erts_atomic32_read_bor_relb(&dep->qflgs, ERTS_DE_QFLG_EXIT);
 	    erts_mtx_unlock(&dep->qlock);
 	}
 
@@ -616,6 +647,9 @@ void init_dist(void)
     dgroup_leader_trap = trap_function(am_dgroup_leader,2);
     dexit_trap = trap_function(am_dexit, 2);
     dmonitor_p_trap = trap_function(am_dmonitor_p, 2);
+    dist_ctrl_put_data_trap = erts_export_put(am_erts_internal,
+                                              am_dist_ctrl_put_data,
+                                              2);
 }
 
 #define ErtsDistOutputBuf2Binary(OB) \
@@ -658,6 +692,8 @@ static void clear_dist_entry(DistEntry *dep)
     ErtsDistOutputBuf *obuf;
 
     erts_de_rwlock(dep);
+    erts_atomic_set_nob(&dep->input_handler,
+                        (erts_aint_t) NIL);
     cache = dep->cache;
     dep->cache = NULL;
 
@@ -671,6 +707,9 @@ static void clear_dist_entry(DistEntry *dep)
 
     erts_mtx_lock(&dep->qlock);
 
+    erts_atomic64_set_nob(&dep->in, 0);
+    erts_atomic64_set_nob(&dep->out, 0);
+
     if (!dep->out_queue.last)
 	obuf = dep->finalized_out_queue.first;
     else {
@@ -678,8 +717,15 @@ static void clear_dist_entry(DistEntry *dep)
 	obuf = dep->out_queue.first;
     }
 
+    if (dep->tmp_out_queue.first) {
+        dep->tmp_out_queue.last->next = obuf;
+        obuf = dep->tmp_out_queue.first;
+    }
+
     dep->out_queue.first = NULL;
     dep->out_queue.last = NULL;
+    dep->tmp_out_queue.first = NULL;
+    dep->tmp_out_queue.last = NULL;
     dep->finalized_out_queue.first = NULL;
     dep->finalized_out_queue.last = NULL;
     dep->status = 0;
@@ -704,8 +750,9 @@ static void clear_dist_entry(DistEntry *dep)
 
     if (obufsize) {
 	erts_mtx_lock(&dep->qlock);
-	ASSERT(dep->qsize >= obufsize);
-	dep->qsize -= obufsize;
+	ASSERT(erts_atomic_read_nob(&dep->qsize) >= obufsize);
+        erts_atomic_add_nob(&dep->qsize,
+                            (erts_aint_t) -obufsize);
 	erts_mtx_unlock(&dep->qlock);
     }
 }
@@ -904,11 +951,30 @@ erts_dsig_send_msg(Eterm remote, Eterm message, ErtsSendContext* ctx)
     }
 #endif
 
-    if (token != NIL)
-	ctl = TUPLE4(&ctx->ctl_heap[0],
-		     make_small(DOP_SEND_TT), am_Empty, remote, token);
-    else
-	ctl = TUPLE3(&ctx->ctl_heap[0], make_small(DOP_SEND), am_Empty, remote);
+    if (token != NIL) {
+        Eterm el1, el2;
+        if (ctx->dep->flags & DFLAG_SEND_SENDER) {
+            el1 = make_small(DOP_SEND_SENDER_TT);
+            el2 = sender->common.id;
+        }
+        else {
+            el1 = make_small(DOP_SEND_TT);
+            el2 = am_Empty;
+        }
+	ctl = TUPLE4(&ctx->ctl_heap[0], el1, el2, remote, token);
+    }
+    else {
+        Eterm el1, el2;
+        if (ctx->dep->flags & DFLAG_SEND_SENDER) {
+            el1 = make_small(DOP_SEND_SENDER);
+            el2 = sender->common.id;
+        }
+        else {
+            el1 = make_small(DOP_SEND);
+            el2 = am_Empty;
+        }
+	ctl = TUPLE3(&ctx->ctl_heap[0], el1, el2, remote);
+    }
     DTRACE6(message_send, sender_name, receiver_name,
             msize, tok_label, tok_lastcnt, tok_serial);
     DTRACE7(message_send_remote, sender_name, node_name, receiver_name,
@@ -1145,6 +1211,7 @@ int erts_net_message(Port *prt,
     ErtsLink *lnk;
     Uint tuple_arity;
     int res;
+    Uint32 connection_id;
 #ifdef ERTS_DIST_MSG_DBG
     ErlDrvSizeT orig_len = len;
 #endif
@@ -1153,14 +1220,17 @@ int erts_net_message(Port *prt,
 
     ERTS_CHK_NO_PROC_LOCKS;
 
-    ERTS_LC_ASSERT(erts_lc_is_port_locked(prt));
+    ERTS_LC_ASSERT(!prt || erts_lc_is_port_locked(prt));
 
     if (!erts_is_alive) {
 	UnUseTmpHeapNoproc(DIST_CTL_DEFAULT_SIZE);
 	return 0;
     }
+
+
     if (hlen != 0)
 	goto data_error;
+
     if (len == 0) {  /* HANDLE TICK !!! */
 	UnUseTmpHeapNoproc(DIST_CTL_DEFAULT_SIZE);
 	return 0;
@@ -1184,25 +1254,31 @@ int erts_net_message(Port *prt,
 	goto data_error;
     }
 
-    res = erts_prepare_dist_ext(&ede, t, len, dep, dep->cache);
+    res = erts_prepare_dist_ext(&ede, t, len, dep, dep->cache, &connection_id);
 
-    if (res >= 0)
-	res = ctl_len = erts_decode_dist_ext_size(&ede);
-    else {
+    switch (res) {
+    case ERTS_PREP_DIST_EXT_CLOSED:
+        return 0; /* Connection not alive; ignore signal... */
+    case ERTS_PREP_DIST_EXT_FAILED:
 #ifdef ERTS_DIST_MSG_DBG
 	erts_fprintf(stderr, "DIST MSG DEBUG: erts_prepare_dist_ext() failed:\n");
 	bw(buf, orig_len);
 #endif
-	ctl_len = 0;
-    }
-
-    if (res < 0) {
+        goto data_error;
+    case ERTS_PREP_DIST_EXT_SUCCESS:
+	ctl_len = erts_decode_dist_ext_size(&ede);
+        if (ctl_len < 0) {
 #ifdef ERTS_DIST_MSG_DBG
-	erts_fprintf(stderr, "DIST MSG DEBUG: erts_decode_dist_ext_size(CTL) failed:\n");
-	bw(buf, orig_len);
+            erts_fprintf(stderr, "DIST MSG DEBUG: erts_decode_dist_ext_size(CTL) failed:\n");
+            bw(buf, orig_len);
 #endif
-	PURIFY_MSG("data error");
-	goto data_error;
+            PURIFY_MSG("data error");
+            goto data_error;
+        }
+        break;
+    default:
+        ERTS_INTERNAL_ERROR("Unexpected result from erts_prepare_dist_ext()");
+        break;
     }
 
     if (ctl_len > DIST_CTL_DEFAULT_SIZE) {
@@ -1233,6 +1309,7 @@ int erts_net_message(Port *prt,
     }
 
     token_size = 0;
+    token = NIL;
 
     switch (type = unsigned_val(tuple[1])) {
     case DOP_LINK:
@@ -1462,38 +1539,52 @@ int erts_net_message(Port *prt,
 	}
 	break;
 
+    case DOP_SEND_SENDER_TT: {
+        Uint xsize;
     case DOP_SEND_TT:
+
 	if (tuple_arity != 4) {
 	    goto invalid_message;
 	}
-	
-	token_size = size_object(tuple[4]);
-	/* Fall through ... */
+
+	token = tuple[4];
+	token_size = size_object(token);
+        xsize = ERTS_HEAP_FRAG_SIZE(token_size);
+        goto send_common;
+
+    case DOP_SEND_SENDER:
     case DOP_SEND:
+
+        token = NIL;
+        xsize = 0;
+	if (tuple_arity != 3)
+	    goto invalid_message;
+
+    send_common:
+
 	/*
-	 * There is intentionally no testing of the cookie (it is always '')
-	 * from R9B and onwards.
+         * If DOP_SEND_SENDER or DOP_SEND_SENDER_TT element 2 contains
+         * the sender pid (i.e. DFLAG_SEND_SENDER is set); otherwise,
+         * the atom '' (empty cookie).
 	 */
+        ASSERT((type == DOP_SEND_SENDER || type == DOP_SEND_SENDER_TT)
+               ? (is_pid(tuple[2]) && (dep->flags & DFLAG_SEND_SENDER))
+               : tuple[2] == am_Empty);
+
 #ifdef ERTS_DIST_MSG_DBG
 	dist_msg_dbg(&ede, "MSG", buf, orig_len);
 #endif
-	if (type != DOP_SEND_TT && tuple_arity != 3) {
-	    goto invalid_message;
-	}
 	to = tuple[3];
 	if (is_not_pid(to)) {
 	    goto invalid_message;
 	}
 	rp = erts_proc_lookup(to);
 	if (rp) {
-	    Uint xsize = type == DOP_SEND ? 0 : ERTS_HEAP_FRAG_SIZE(token_size);
 	    ErtsProcLocks locks = 0;
 	    ErtsDistExternal *ede_copy;
 
 	    ede_copy = erts_make_dist_ext_copy(&ede, xsize);
-	    if (type == DOP_SEND) {
-		token = NIL;
-	    } else {
+	    if (is_not_nil(token)) {
 		ErlHeapFragment *heap_frag;
 		ErlOffHeap *ohp;
 		ASSERT(xsize);
@@ -1501,15 +1592,15 @@ int erts_net_message(Port *prt,
 		ERTS_INIT_HEAP_FRAG(heap_frag, token_size, token_size);
 		hp = heap_frag->mem;
 		ohp = &heap_frag->off_heap;
-		token = tuple[4];
 		token = copy_struct(token, token_size, &hp, ohp);
 	    }
 
-	    erts_queue_dist_message(rp, locks, ede_copy, token, tuple[2]);
+	    erts_queue_dist_message(rp, locks, ede_copy, token, am_Empty);
 	    if (locks)
 		erts_proc_unlock(rp, locks);
 	}
 	break;
+    }
 
     case DOP_MONITOR_P_EXIT: {
 	/* We are monitoring a process on the remote node which dies, we get
@@ -1723,7 +1814,7 @@ decode_error:
     }
 data_error:
     UnUseTmpHeapNoproc(DIST_CTL_DEFAULT_SIZE);
-    erts_deliver_port_exit(prt, dep->cid, am_killed, 0, 1);
+    erts_kill_dist_connection(dep, connection_id);
     ERTS_CHK_NO_PROC_LOCKS;
     return -1;
 }
@@ -1744,6 +1835,31 @@ static int dsig_send_ctl(ErtsDSigData* dsdp, Eterm ctl, int force_busy)
     return ret;
 }
 
+static ERTS_INLINE void
+notify_dist_data(Process *c_p, Eterm pid)
+{
+    Process *rp;
+    ErtsProcLocks rp_locks;
+
+    ASSERT(erts_get_scheduler_data()
+           && !ERTS_SCHEDULER_IS_DIRTY(erts_get_scheduler_data()));
+    ASSERT(is_internal_pid(pid));
+
+    if (c_p && c_p->common.id == pid) {
+        rp = c_p;
+        rp_locks = ERTS_PROC_LOCK_MAIN;
+    }
+    else {
+        rp = erts_proc_lookup(pid);
+        rp_locks = 0;
+    }
+
+    if (rp) {
+        ErtsMessage *mp = erts_alloc_message(0, NULL);
+        erts_queue_message(rp, rp_locks, mp, am_dist_data, am_system);
+    }
+}
+
 int
 erts_dsig_send(ErtsDSigData *dsdp, struct erts_dsig_send_context* ctx)
 {
@@ -1859,12 +1975,32 @@ erts_dsig_send(ErtsDSigData *dsdp, struct erts_dsig_send_context* ctx)
 		free_dist_obuf(ctx->obuf);
 	    }
 	    else {
+                Sint qsize;
+                erts_aint32_t qflgs;
 		ErtsProcList *plp = NULL;
+                Eterm notify_proc = NIL;
+                Sint obsz = size_obuf(ctx->obuf);
+
 		erts_mtx_lock(&dep->qlock);
-		dep->qsize += size_obuf(ctx->obuf);
-		if (dep->qsize >= erts_dist_buf_busy_limit)
-		    dep->qflgs |= ERTS_DE_QFLG_BUSY;
-		if (!ctx->force_busy && (dep->qflgs & ERTS_DE_QFLG_BUSY)) {
+		qsize = erts_atomic_add_read_nob(&dep->qsize, (erts_aint_t) obsz);
+                ASSERT(qsize >= obsz);
+                qflgs = erts_atomic32_read_nob(&dep->qflgs);
+		if (!(qflgs & ERTS_DE_QFLG_BUSY) && qsize >= erts_dist_buf_busy_limit) {
+		    erts_atomic32_read_bor_relb(&dep->qflgs, ERTS_DE_QFLG_BUSY);
+                    qflgs |= ERTS_DE_QFLG_BUSY;
+                }
+                if (qsize == obsz && (qflgs & ERTS_DE_QFLG_REQ_INFO)) {
+                    /* Previously empty queue and info requested... */
+                    qflgs = erts_atomic32_read_band_mb(&dep->qflgs,
+                                                       ~ERTS_DE_QFLG_REQ_INFO);
+                    if (qflgs & ERTS_DE_QFLG_REQ_INFO) {
+                        notify_proc = dep->cid;
+                        ASSERT(is_internal_pid(notify_proc));
+                    }
+                    /* else: requester will send itself the message... */
+                    qflgs &= ~ERTS_DE_QFLG_REQ_INFO;
+                }
+		if (!ctx->force_busy && (qflgs & ERTS_DE_QFLG_BUSY)) {
 		    erts_mtx_unlock(&dep->qlock);
 
 		    plp = erts_proclist_create(ctx->c_p);
@@ -1881,7 +2017,8 @@ erts_dsig_send(ErtsDSigData *dsdp, struct erts_dsig_send_context* ctx)
 		dep->out_queue.last = ctx->obuf;
 
 		if (!ctx->force_busy) {
-		    if (!(dep->qflgs & ERTS_DE_QFLG_BUSY)) {
+                    qflgs = erts_atomic32_read_nob(&dep->qflgs);
+		    if (!(qflgs & ERTS_DE_QFLG_BUSY)) {
 			if (suspended)
 			    resume = 1; /* was busy when we started, but isn't now */
     #ifdef USE_VM_PROBES
@@ -1906,8 +2043,11 @@ erts_dsig_send(ErtsDSigData *dsdp, struct erts_dsig_send_context* ctx)
 		}
 
 		erts_mtx_unlock(&dep->qlock);
-		erts_schedule_dist_command(NULL, dep);
+                if (is_internal_port(dep->cid))
+                    erts_schedule_dist_command(NULL, dep);
 		erts_de_runlock(dep);
+                if (is_internal_pid(notify_proc))
+                    notify_dist_data(ctx->c_p, notify_proc);
 
 		if (resume) {
 		    erts_resume(ctx->c_p, ERTS_PROC_LOCK_MAIN);
@@ -1961,16 +2101,20 @@ static Uint
 dist_port_command(Port *prt, ErtsDistOutputBuf *obuf)
 {
     int fpe_was_unmasked;
-    Uint size = obuf->ext_endp - obuf->extp;
+    ErlDrvSizeT size;
+    char *bufp;
 
     ERTS_CHK_NO_PROC_LOCKS;
     ERTS_LC_ASSERT(erts_lc_is_port_locked(prt));
 
-    if (size > (Uint) INT_MAX)
-	erts_exit(ERTS_DUMP_EXIT,
-		 "Absurdly large distribution output data buffer "
-		 "(%beu bytes) passed.\n",
-		 size);
+    if (!obuf) {
+        size = 0;
+        bufp = NULL;
+    }
+    else {
+        size = obuf->ext_endp - obuf->extp;
+        bufp = (char*) obuf->extp;
+    }
 
 #ifdef USE_VM_PROBES
     if (DTRACE_ENABLED(dist_output)) {
@@ -1985,11 +2129,10 @@ dist_port_command(Port *prt, ErtsDistOutputBuf *obuf)
                 remote_str, size);
     }
 #endif
+
     prt->caller = NIL;
     fpe_was_unmasked = erts_block_fpe();
-    (*prt->drv_ptr->output)((ErlDrvData) prt->drv_data,
-			    (char*) obuf->extp,
-			    (int) size);
+    (*prt->drv_ptr->output)((ErlDrvData) prt->drv_data, bufp, size);
     erts_unblock_fpe(fpe_was_unmasked);
     return size;
 }
@@ -1998,7 +2141,7 @@ static Uint
 dist_port_commandv(Port *prt, ErtsDistOutputBuf *obuf)
 {
     int fpe_was_unmasked;
-    Uint size = obuf->ext_endp - obuf->extp;
+    ErlDrvSizeT size;
     SysIOVec iov[2];
     ErlDrvBinary* bv[2];
     ErlIOVec eiov;
@@ -2006,25 +2149,33 @@ dist_port_commandv(Port *prt, ErtsDistOutputBuf *obuf)
     ERTS_CHK_NO_PROC_LOCKS;
     ERTS_LC_ASSERT(erts_lc_is_port_locked(prt));
 
-    if (size > (Uint) INT_MAX)
-	erts_exit(ERTS_DUMP_EXIT,
-		 "Absurdly large distribution output data buffer "
-		 "(%beu bytes) passed.\n",
-		 size);
-
     iov[0].iov_base = NULL;
     iov[0].iov_len = 0;
     bv[0] = NULL;
 
-    iov[1].iov_base = obuf->extp;
-    iov[1].iov_len = size;
-    bv[1] = Binary2ErlDrvBinary(ErtsDistOutputBuf2Binary(obuf));
+    if (!obuf) {
+        size = 0;
+        eiov.vsize = 1;
+    }
+    else {
+        size = obuf->ext_endp - obuf->extp;
+        eiov.vsize = 2;
+
+        iov[1].iov_base = obuf->extp;
+        iov[1].iov_len = size;
+        bv[1] = Binary2ErlDrvBinary(ErtsDistOutputBuf2Binary(obuf));
+    }
 
-    eiov.vsize = 2;
     eiov.size = size;
     eiov.iov = iov;
     eiov.binv = bv;
 
+    if (size > (Uint) INT_MAX)
+	erts_exit(ERTS_DUMP_EXIT,
+		 "Absurdly large distribution output data buffer "
+		 "(%beu bytes) passed.\n",
+		 size);
+
     ASSERT(prt->drv_ptr->outputv);
 
 #ifdef USE_VM_PROBES
@@ -2072,7 +2223,7 @@ erts_dist_command(Port *prt, int reds_limit)
     Sint reds = ERTS_PORT_REDS_DIST_CMD_START;
     Uint32 status;
     Uint32 flags;
-    Sint obufsize = 0;
+    Sint qsize, obufsize = 0;
     ErtsDistOutputQueue oq, foq;
     DistEntry *dep = prt->dist_entry;
     Uint (*send)(Port *prt, ErtsDistOutputBuf *obuf);
@@ -2081,9 +2232,6 @@ erts_dist_command(Port *prt, int reds_limit)
 
     ERTS_LC_ASSERT(erts_lc_is_port_locked(prt));
 
-    erts_refc_inc(&dep->refc, 1); /* Otherwise dist_entry might be
-				     removed if port command fails */
-
     erts_atomic_set_mb(&dep->dist_cmd_scheduled, 0);
 
     erts_de_rlock(dep);
@@ -2094,7 +2242,6 @@ erts_dist_command(Port *prt, int reds_limit)
 
     if (status & ERTS_DE_SFLG_EXITING) {
 	erts_deliver_port_exit(prt, prt->common.id, am_killed, 0, 1);
-	erts_deref_dist_entry(dep);
 	return reds + ERTS_PORT_REDS_DIST_CMD_EXIT;
     }
 
@@ -2128,20 +2275,20 @@ erts_dist_command(Port *prt, int reds_limit)
     if (!(sched_flags & ERTS_PTS_FLG_BUSY_PORT) && foq.first) {
 	int preempt = 0;
 	do {
-	    Uint size;
-	    ErtsDistOutputBuf *fob;
-
-	    size = (*send)(prt, foq.first);
-	    esdp->io.out += (Uint64) size;
+            Uint size;
+            ErtsDistOutputBuf *fob;
+            size = (*send)(prt, foq.first);
+            erts_atomic64_inc_nob(&dep->out);
+            esdp->io.out += (Uint64) size;
 #ifdef ERTS_RAW_DIST_MSG_DBG
-	    erts_fprintf(stderr, ">> ");
-	    bw(foq.first->extp, size);
+            erts_fprintf(stderr, ">> ");
+            bw(foq.first->extp, size);
 #endif
-	    reds += ERTS_PORT_REDS_DIST_CMD_DATA(size);
-	    fob = foq.first;
-	    obufsize += size_obuf(fob);
-	    foq.first = foq.first->next;
-	    free_dist_obuf(fob);
+            reds += ERTS_PORT_REDS_DIST_CMD_DATA(size);
+            fob = foq.first;
+            obufsize += size_obuf(fob);
+            foq.first = foq.first->next;
+            free_dist_obuf(fob);
 	    sched_flags = erts_atomic32_read_nob(&prt->sched.flags);
 	    preempt = reds > reds_limit || (sched_flags & ERTS_PTS_FLG_EXIT);
 	    if (sched_flags & ERTS_PTS_FLG_BUSY_PORT)
@@ -2202,31 +2349,33 @@ erts_dist_command(Port *prt, int reds_limit)
 	}
     }
     else {
+        int de_busy;
 	int preempt = 0;
 	while (oq.first && !preempt) {
-	    ErtsDistOutputBuf *fob;
-	    Uint size;
-	    oq.first->extp
-		= erts_encode_ext_dist_header_finalize(oq.first->extp,
-						       dep->cache,
-						       flags);
-	    reds += ERTS_PORT_REDS_DIST_CMD_FINALIZE;
-	    if (!(flags & DFLAG_DIST_HDR_ATOM_CACHE))
-		*--oq.first->extp = PASS_THROUGH; /* Old node; 'pass through'
-						     needed */
-	    ASSERT(&oq.first->data[0] <= oq.first->extp
-		   && oq.first->extp < oq.first->ext_endp);
-	    size = (*send)(prt, oq.first);
-	    esdp->io.out += (Uint64) size;
+            ErtsDistOutputBuf *fob;
+            Uint size;
+            oq.first->extp
+                = erts_encode_ext_dist_header_finalize(oq.first->extp,
+                                                       dep->cache,
+                                                       flags);
+            reds += ERTS_PORT_REDS_DIST_CMD_FINALIZE;
+            if (!(flags & DFLAG_DIST_HDR_ATOM_CACHE))
+                *--oq.first->extp = PASS_THROUGH; /* Old node; 'pass through'
+                                                     needed */
+            ASSERT(&oq.first->data[0] <= oq.first->extp
+                   && oq.first->extp < oq.first->ext_endp);
+            size = (*send)(prt, oq.first);
+            erts_atomic64_inc_nob(&dep->out);
+            esdp->io.out += (Uint64) size;
 #ifdef ERTS_RAW_DIST_MSG_DBG
-	    erts_fprintf(stderr, ">> ");
-	    bw(oq.first->extp, size);
+            erts_fprintf(stderr, ">> ");
+            bw(oq.first->extp, size);
 #endif
-	    reds += ERTS_PORT_REDS_DIST_CMD_DATA(size);
-	    fob = oq.first;
-	    obufsize += size_obuf(fob);
-	    oq.first = oq.first->next;
-	    free_dist_obuf(fob);
+            reds += ERTS_PORT_REDS_DIST_CMD_DATA(size);
+            fob = oq.first;
+            obufsize += size_obuf(fob);
+            oq.first = oq.first->next;
+            free_dist_obuf(fob);
 	    sched_flags = erts_atomic32_read_nob(&prt->sched.flags);
 	    preempt = reds > reds_limit || (sched_flags & ERTS_PTS_FLG_EXIT);
 	    if ((sched_flags & ERTS_PTS_FLG_BUSY_PORT) && oq.first && !preempt)
@@ -2255,12 +2404,13 @@ erts_dist_command(Port *prt, int reds_limit)
 	 * processes.
 	 */
 	erts_mtx_lock(&dep->qlock);
-	ASSERT(dep->qsize >= obufsize);
-	dep->qsize -= obufsize;
+        de_busy = !!(erts_atomic32_read_nob(&dep->qflgs) & ERTS_DE_QFLG_BUSY);
+        qsize = (Sint) erts_atomic_add_read_nob(&dep->qsize,
+                                                (erts_aint_t) -obufsize);
+	ASSERT(qsize >= 0);
 	obufsize = 0;
 	if (!(sched_flags & ERTS_PTS_FLG_BUSY_PORT)
-	    && (dep->qflgs & ERTS_DE_QFLG_BUSY)
-	    && dep->qsize < erts_dist_buf_busy_limit) {
+	    && de_busy && qsize < erts_dist_buf_busy_limit) {
 	    ErtsProcList *suspendees;
 	    int resumed;
 	    suspendees = get_suspended_on_de(dep, ERTS_DE_QFLG_BUSY);
@@ -2280,8 +2430,13 @@ erts_dist_command(Port *prt, int reds_limit)
     if (obufsize != 0) {
 	ASSERT(obufsize > 0);
 	erts_mtx_lock(&dep->qlock);
-	ASSERT(dep->qsize >= obufsize);
-	dep->qsize -= obufsize;
+#ifdef DEBUG
+        qsize = (Sint) erts_atomic_add_read_nob(&dep->qsize,
+                                                (erts_aint_t) -obufsize);
+	ASSERT(qsize >= 0);
+#else
+        erts_atomic_add_nob(&dep->qsize, (erts_aint_t) -obufsize);
+#endif
 	erts_mtx_unlock(&dep->qlock);
     }
 
@@ -2299,8 +2454,6 @@ erts_dist_command(Port *prt, int reds_limit)
     if (reds > INT_MAX/2)
 	reds = INT_MAX/2;
 
-    erts_deref_dist_entry(dep);
-
     return reds;
 
  preempted:
@@ -2337,7 +2490,7 @@ erts_dist_command(Port *prt, int reds_limit)
 
 #ifdef DEBUG
 	erts_mtx_lock(&dep->qlock);
-	ASSERT(dep->qsize == obufsize);
+	ASSERT(erts_atomic_read_nob(&dep->qsize) == obufsize);
 	erts_mtx_unlock(&dep->qlock);
 #endif
     }
@@ -2348,7 +2501,7 @@ erts_dist_command(Port *prt, int reds_limit)
 	     * in out_queue.
 	     */
 	    erts_mtx_lock(&dep->qlock);
-	    dep->qsize -= obufsize;
+	    erts_atomic_add_nob(&dep->qsize, -obufsize);
 	    obufsize = 0;
 	    oq.last->next = dep->out_queue.first;
 	    dep->out_queue.first = oq.first;
@@ -2362,6 +2515,370 @@ erts_dist_command(Port *prt, int reds_limit)
     goto done;
 }
 
+#if 0
+
+int
+dist_data_finalize(Process *c_p, int reds_limit)
+{
+    int reds = 5;
+    DistEntry *dep = ;
+    ErtsDistOutputQueue oq, foq;
+    ErtsDistOutputBuf *ob;
+    int preempt;
+
+
+    erts_mtx_lock(&dep->qlock);
+    flags = dep->flags;
+    oq.first = dep->out_queue.first;
+    oq.last = dep->out_queue.last;
+    dep->out_queue.first = NULL;
+    dep->out_queue.last = NULL;
+    erts_mtx_unlock(&dep->qlock);
+
+    if (!oq.first) {
+        ASSERT(!oq.last);
+        oq.first = dep->tmp_out_queue.first;
+        oq.last = dep->tmp_out_queue.last;
+    }
+    else {
+        ErtsDistOutputBuf *f, *l;
+        ASSERT(oq.last);
+        if (dep->tmp_out_queue.last) {
+            dep->tmp_out_queue.last->next = oq.first;
+            oq.first = dep->tmp_out_queue.first;
+        }
+    }
+
+    if (!oq.first) {
+        /* Nothing to do... */
+        ASSERT(!oq.last);
+        return reds;
+    }
+
+    foq.first = dep->finalized_out_queue.first;
+    foq.last = dep->finalized_out_queue.last;
+
+    preempt = 0;
+    ob = oq.first;
+    ASSERT(ob);
+
+    do {
+        ob->extp = erts_encode_ext_dist_header_finalize(ob->extp,
+                                                        dep->cache,
+                                                        flags);
+        if (!(flags & DFLAG_DIST_HDR_ATOM_CACHE))
+            *--ob->extp = PASS_THROUGH; /* Old node; 'pass through'
+                                           needed */
+        ASSERT(&ob->data[0] <= ob->extp && ob->extp < ob->ext_endp);
+        reds += ERTS_PORT_REDS_DIST_CMD_FINALIZE;
+        preempt = reds > reds_limit;
+        if (preempt)
+            break;
+        ob = ob->next;
+    } while (ob);
+    /*
+     * At least one buffer was finalized; if we got preempted,
+     * ob points to the last buffer that we finalized.
+     */
+    if (foq.last)
+        foq.last->next = oq.first;
+    else
+        foq.first = oq.first;
+    if (!preempt) {
+        /* All buffers finalized */
+        foq.last = oq.last;
+        oq.first = oq.last = NULL;
+    }
+    else {
+        /* Not all buffers finalized; split oq. */
+        foq.last = ob;
+        oq.first = ob->next;
+        if (oq.first)
+            ob->next = NULL;
+        else
+            oq.last = NULL;
+    }
+
+    dep->finalized_out_queue.first = foq.first;
+    dep->finalized_out_queue.last = foq.last;
+    dep->tmp_out_queue.first = oq.first;
+    dep->tmp_out_queue.last = oq.last;
+
+    return reds;
+}
+
+#endif
+
+BIF_RETTYPE
+dist_ctrl_get_data_notification_1(BIF_ALIST_1)
+{
+    DistEntry *dep = ERTS_PROC_GET_DIST_ENTRY(BIF_P);
+    erts_aint32_t qflgs;
+    erts_aint_t qsize;
+    Eterm receiver = NIL;
+
+    if (!dep)
+        BIF_ERROR(BIF_P, EXC_NOTSUP);
+
+    if (erts_dhandle_to_dist_entry(BIF_ARG_1) != dep)
+        BIF_ERROR(BIF_P, BADARG);
+
+    /*
+     * Caller is the only one that can consume from this queue
+     * and the only one that can set the req-info flag...
+     */
+
+    erts_de_rlock(dep);
+
+    ASSERT(dep->cid == BIF_P->common.id);
+
+    qflgs = erts_atomic32_read_acqb(&dep->qflgs);
+
+    if (!(qflgs & ERTS_DE_QFLG_REQ_INFO)) {
+        qsize = erts_atomic_read_acqb(&dep->qsize);
+        ASSERT(qsize >= 0);
+        if (qsize > 0)
+            receiver = BIF_P->common.id; /* Notify ourselves... */
+        else { /* Empty queue; set req-info flag... */
+            qflgs = erts_atomic32_read_bor_mb(&dep->qflgs,
+                                                  ERTS_DE_QFLG_REQ_INFO);
+            qsize = erts_atomic_read_acqb(&dep->qsize);
+            ASSERT(qsize >= 0);
+            if (qsize > 0) {
+                qflgs = erts_atomic32_read_band_mb(&dep->qflgs,
+                                                       ~ERTS_DE_QFLG_REQ_INFO);
+                if (qflgs & ERTS_DE_QFLG_REQ_INFO)
+                    receiver = BIF_P->common.id; /* Notify ourselves... */
+                /* else: someone else will notify us... */
+            }
+            /* else: still empty queue... */
+        }
+    }
+    /* else: Already requested... */
+
+    erts_de_runlock(dep);
+
+    if (is_internal_pid(receiver))
+        notify_dist_data(BIF_P, receiver);
+
+    BIF_RET(am_ok);
+}
+
+BIF_RETTYPE
+dist_ctrl_put_data_2(BIF_ALIST_2)
+{
+    DistEntry *dep;
+    ErlDrvSizeT size;
+    Eterm input_handler;
+
+    if (is_binary(BIF_ARG_2))
+        size = binary_size(BIF_ARG_2);
+    else if (is_nil(BIF_ARG_2))
+        size = 0;
+    else if (is_list(BIF_ARG_2))
+        BIF_TRAP2(dist_ctrl_put_data_trap,
+                  BIF_P, BIF_ARG_1, BIF_ARG_2);
+    else
+        BIF_ERROR(BIF_P, BADARG);
+
+    dep = erts_dhandle_to_dist_entry(BIF_ARG_1);
+    if (!dep)
+        BIF_ERROR(BIF_P, BADARG);
+
+    input_handler = (Eterm) erts_atomic_read_nob(&dep->input_handler);
+
+    if (input_handler != BIF_P->common.id)
+        BIF_ERROR(BIF_P, EXC_NOTSUP);
+
+    erts_atomic64_inc_nob(&dep->in);
+
+    if (size != 0) {
+        byte *data, *temp_alloc = NULL;
+
+        data = (byte *) erts_get_aligned_binary_bytes(BIF_ARG_2, &temp_alloc);
+        if (!data)
+            BIF_ERROR(BIF_P, BADARG);
+
+        erts_proc_unlock(BIF_P, ERTS_PROC_LOCK_MAIN);
+
+        (void) erts_net_message(NULL, dep, NULL, 0, data, size);
+        /*
+         * We ignore any decode failures. On fatal failures the
+         * connection will be taken down by killing the
+         * distribution channel controller...
+         */
+
+        erts_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);
+
+        BUMP_REDS(BIF_P, 5);
+
+        erts_free_aligned_binary_bytes(temp_alloc);
+
+    }
+
+    BIF_RET(am_ok);
+}
+
+BIF_RETTYPE
+dist_get_stat_1(BIF_ALIST_1)
+{
+    Sint64 read, write, pend;
+    Eterm res, *hp, **hpp;
+    Uint sz, *szp;
+    DistEntry *dep = erts_dhandle_to_dist_entry(BIF_ARG_1);
+
+    if (!dep)
+        BIF_ERROR(BIF_P, BADARG);
+
+    erts_de_rlock(dep);
+
+    read = (Sint64) erts_atomic64_read_nob(&dep->in);
+    write = (Sint64) erts_atomic64_read_nob(&dep->out);
+    pend = (Sint64) erts_atomic_read_nob(&dep->qsize);
+
+    erts_de_runlock(dep);
+
+    sz = 0;
+    szp = &sz;
+    hpp = NULL;
+
+    while (1) {
+        res = erts_bld_tuple(hpp, szp, 4,
+                             am_ok,
+                             erts_bld_sint64(hpp, szp, read),
+                             erts_bld_sint64(hpp, szp, write),
+                             pend ? am_true : am_false);
+        if (hpp)
+            break;
+        hp = HAlloc(BIF_P, sz);
+        hpp = &hp;
+        szp = NULL;
+    }
+
+    BIF_RET(res);
+}
+
+BIF_RETTYPE
+dist_ctrl_input_handler_2(BIF_ALIST_2)
+{
+    DistEntry *dep = ERTS_PROC_GET_DIST_ENTRY(BIF_P);
+
+    if (!dep)
+        BIF_ERROR(BIF_P, EXC_NOTSUP);
+
+    if (erts_dhandle_to_dist_entry(BIF_ARG_1) != dep)
+        BIF_ERROR(BIF_P, BADARG);
+
+    if (is_not_internal_pid(BIF_ARG_2))
+        BIF_ERROR(BIF_P, BADARG);
+
+    erts_atomic_set_nob(&dep->input_handler,
+                        (erts_aint_t) BIF_ARG_2);
+
+    BIF_RET(am_ok);
+}
+
+BIF_RETTYPE
+dist_ctrl_get_data_1(BIF_ALIST_1)
+{
+    DistEntry *dep = ERTS_PROC_GET_DIST_ENTRY(BIF_P);
+    int reds = 1;
+    ErtsDistOutputBuf *obuf;
+    Eterm *hp;
+    ProcBin *pb;
+    erts_aint_t qsize;
+
+    if (!dep)
+        BIF_ERROR(BIF_P, EXC_NOTSUP);
+
+    if (erts_dhandle_to_dist_entry(BIF_ARG_1) != dep)
+        BIF_ERROR(BIF_P, BADARG);
+
+    erts_de_rlock(dep);
+
+    if (dep->status & ERTS_DE_SFLG_EXITING)
+        goto return_none;
+
+    ASSERT(dep->cid == BIF_P->common.id);
+
+#if 0
+    if (dep->finalized_out_queue.first) {
+        obuf = dep->finalized_out_queue.first;
+        dep->finalized_out_queue.first = obuf->next;
+        if (!obuf->next)
+            dep->finalized_out_queue.last = NULL;
+    }
+    else
+#endif
+    {
+        if (!dep->tmp_out_queue.first) {
+            ASSERT(!dep->tmp_out_queue.last);
+            qsize = erts_atomic_read_acqb(&dep->qsize);
+            if (qsize > 0) {
+                erts_mtx_lock(&dep->qlock);
+                dep->tmp_out_queue.first = dep->out_queue.first;
+                dep->tmp_out_queue.last = dep->out_queue.last;
+                dep->out_queue.first = NULL;
+                dep->out_queue.last = NULL;
+                erts_mtx_unlock(&dep->qlock);
+            }
+        }
+
+        if (!dep->tmp_out_queue.first) {
+            ASSERT(!dep->tmp_out_queue.last);
+        return_none:
+            erts_de_runlock(dep);
+            BIF_RET(am_none);
+        }
+        else {
+            obuf = dep->tmp_out_queue.first;
+            dep->tmp_out_queue.first = obuf->next;
+            if (!obuf->next)
+                dep->tmp_out_queue.last = NULL;
+        }
+
+        obuf->extp = erts_encode_ext_dist_header_finalize(obuf->extp,
+                                                          dep->cache,
+                                                          dep->flags);
+        reds += ERTS_PORT_REDS_DIST_CMD_FINALIZE;
+        if (!(dep->flags & DFLAG_DIST_HDR_ATOM_CACHE))
+            *--obuf->extp = PASS_THROUGH; /* 'pass through' needed */
+        ASSERT(&obuf->data[0] <= obuf->extp
+               && obuf->extp < obuf->ext_endp);
+    }
+
+    erts_atomic64_inc_nob(&dep->out);
+
+    erts_de_runlock(dep);
+
+    hp =  HAlloc(BIF_P, PROC_BIN_SIZE);
+    pb = (ProcBin *) (char *) hp;
+    pb->thing_word = HEADER_PROC_BIN;
+    pb->size = obuf->ext_endp - obuf->extp;
+    pb->next = MSO(BIF_P).first;
+    MSO(BIF_P).first = (struct erl_off_heap_header*) pb;
+    pb->val = ErtsDistOutputBuf2Binary(obuf);
+    pb->bytes = (byte*) obuf->extp;
+    pb->flags = 0;
+
+    qsize = erts_atomic_add_read_nob(&dep->qsize, -size_obuf(obuf));
+    ASSERT(qsize >= 0);
+
+    if (qsize < erts_dist_buf_busy_limit/2
+        && (erts_atomic32_read_acqb(&dep->qflgs) & ERTS_DE_QFLG_BUSY)) {
+        ErtsProcList *resume_procs = NULL;
+        erts_mtx_lock(&dep->qlock);
+        resume_procs = get_suspended_on_de(dep, ERTS_DE_QFLG_BUSY);
+        erts_mtx_unlock(&dep->qlock);
+        if (resume_procs) {
+            int resumed = erts_resume_processes(resume_procs);
+            reds += resumed*ERTS_PORT_REDS_DIST_CMD_RESUMED;
+        }
+    }
+
+    BIF_RET2(make_binary(pb), reds);
+}
+
 void
 erts_dist_port_not_busy(Port *prt)
 {
@@ -2385,18 +2902,20 @@ void
 erts_kill_dist_connection(DistEntry *dep, Uint32 connection_id)
 {
     erts_de_rwlock(dep);
-    if (is_internal_port(dep->cid)
-	&& connection_id == dep->connection_id
+    if (connection_id == dep->connection_id
 	&& !(dep->status & ERTS_DE_SFLG_EXITING)) {
 
 	dep->status |= ERTS_DE_SFLG_EXITING;
 
 	erts_mtx_lock(&dep->qlock);
-	ASSERT(!(dep->qflgs & ERTS_DE_QFLG_EXIT));
-	dep->qflgs |= ERTS_DE_QFLG_EXIT;
+	ASSERT(!(erts_atomic32_read_nob(&dep->qflgs) & ERTS_DE_QFLG_EXIT));
+	erts_atomic32_read_bor_nob(&dep->qflgs, ERTS_DE_QFLG_EXIT);
 	erts_mtx_unlock(&dep->qlock);
 
-	erts_schedule_dist_command(NULL, dep);
+        if (is_internal_port(dep->cid))
+            erts_schedule_dist_command(NULL, dep);
+        else if (is_internal_pid(dep->cid))
+            schedule_kill_dist_ctrl_proc(dep->cid);
     }
     erts_de_rwunlock(dep);
 }
@@ -2513,9 +3032,6 @@ info_dist_entry(fmtfn_t to, void *arg, DistEntry *dep, int visible, int connecte
   }
 
   erts_print(to, arg, "Name: %T", dep->sysname);
-#ifdef DEBUG
-  erts_print(to, arg, " (refc=%d)", erts_refc_read(&dep->refc, 0));
-#endif
   erts_print(to, arg, "\n");
   if (!connected && is_nil(dep->cid)) {
     if (dep->nlinks) {
@@ -2635,17 +3151,23 @@ BIF_RETTYPE setnode_2(BIF_ALIST_2)
 	goto error;
     }
 
-    net_kernel = erts_whereis_process(BIF_P, ERTS_PROC_LOCK_MAIN,
-				      am_net_kernel, ERTS_PROC_LOCK_MAIN, 0);
-    if (!net_kernel)
+    net_kernel = erts_whereis_process(BIF_P,
+                                      ERTS_PROC_LOCK_MAIN,
+				      am_net_kernel,
+                                      ERTS_PROC_LOCK_MAIN|ERTS_PROC_LOCK_STATUS,
+                                      0);
+    if (!net_kernel || ERTS_PROC_GET_DIST_ENTRY(net_kernel))
 	goto error;
 
     /* By setting F_DISTRIBUTION on net_kernel,
-     * do_net_exist will be called when net_kernel is terminated !! */
+     * erts_do_net_exits will be called when net_kernel is terminated !! */
     net_kernel->flags |= F_DISTRIBUTION;
 
-    if (net_kernel != BIF_P)
-	erts_proc_unlock(net_kernel, ERTS_PROC_LOCK_MAIN);
+    erts_proc_unlock(net_kernel,
+                     (ERTS_PROC_LOCK_STATUS
+                      | ((net_kernel != BIF_P)
+                         ? ERTS_PROC_LOCK_MAIN
+                         : 0)));
 
 #ifdef DEBUG
     erts_rwmtx_rlock(&erts_dist_table_rwmtx);
@@ -2662,6 +3184,14 @@ BIF_RETTYPE setnode_2(BIF_ALIST_2)
     erts_thr_progress_unblock();
     erts_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);
 
+    /*
+     * Note erts_this_dist_entry is changed by erts_set_this_node(),
+     * so we *need* to use the new one after erts_set_this_node()
+     * is called.
+     */
+    erts_ref_dist_entry(erts_this_dist_entry);
+    ERTS_PROC_SET_DIST_ENTRY(net_kernel, erts_this_dist_entry);
+
     BIF_RET(am_true);
 
  error:
@@ -2691,18 +3221,18 @@ BIF_RETTYPE setnode_3(BIF_ALIST_3)
     Eterm ic, oc;
     Eterm *tp;
     DistEntry *dep = NULL;
+    ErtsProcLocks proc_unlock = 0;
+    Process *proc;
     Port *pp = NULL;
 
-    /* Prepare for success */
-    ERTS_BIF_PREP_RET(ret, am_true);
-
     /*
      * Check and pick out arguments
      */
 
     if (!is_node_name_atom(BIF_ARG_1) ||
-	is_not_internal_port(BIF_ARG_2) ||
-	(erts_this_node->sysname == am_Noname)) {
+	!(is_internal_port(BIF_ARG_2)
+          || is_internal_pid(BIF_ARG_2))
+	|| (erts_this_node->sysname == am_Noname)) {
 	goto badarg;
     }
 
@@ -2746,77 +3276,120 @@ BIF_RETTYPE setnode_3(BIF_ALIST_3)
     else if (!dep)
 	goto system_limit; /* Should never happen!!! */
 
-    pp = erts_id2port_sflgs(BIF_ARG_2,
-			    BIF_P,
-			    ERTS_PROC_LOCK_MAIN,
-			    ERTS_PORT_SFLGS_INVALID_LOOKUP);
-    erts_de_rwlock(dep);
+    if (is_internal_pid(BIF_ARG_2)) {
+        if (BIF_P->common.id == BIF_ARG_2) {
+            proc_unlock = 0;
+            proc = BIF_P;
+        }
+        else {
+            proc_unlock = ERTS_PROC_LOCK_MAIN;
+            proc = erts_pid2proc_not_running(BIF_P, ERTS_PROC_LOCK_MAIN,
+                                             BIF_ARG_2, proc_unlock);
+        }
+        erts_de_rwlock(dep);
 
-    if (!pp || (erts_atomic32_read_nob(&pp->state)
-		& ERTS_PORT_SFLG_EXITING))
-	goto badarg;
+        if (!proc)
+            goto badarg;
+        else if (proc == ERTS_PROC_LOCK_BUSY) {
+            proc_unlock = 0;
+            goto yield;
+        }
 
-    if ((pp->drv_ptr->flags & ERL_DRV_FLAG_SOFT_BUSY) == 0)
-	goto badarg;
+        erts_proc_lock(proc, ERTS_PROC_LOCK_STATUS);
+        proc_unlock |= ERTS_PROC_LOCK_STATUS;
 
-    if (dep->cid == BIF_ARG_2 && pp->dist_entry == dep)
-	goto done; /* Already set */
+        if (ERTS_PROC_GET_DIST_ENTRY(proc)) {
+            if (dep == ERTS_PROC_GET_DIST_ENTRY(proc)
+                && (proc->flags & F_DISTRIBUTION)
+                && dep->cid == BIF_ARG_2)
+                goto done;
+            goto badarg;
+        }
 
-    if (dep->status & ERTS_DE_SFLG_EXITING) {
-	/* Suspend on dist entry waiting for the exit to finish */
-	ErtsProcList *plp = erts_proclist_create(BIF_P);
-	plp->next = NULL;
-	erts_suspend(BIF_P, ERTS_PROC_LOCK_MAIN, NULL);
-	erts_mtx_lock(&dep->qlock);
-	erts_proclist_store_last(&dep->suspended, plp);
-	erts_mtx_unlock(&dep->qlock);
-	goto yield;
-    }
+        if (is_not_nil(dep->cid))
+            goto badarg;
 
-    ASSERT(!(dep->status & ERTS_DE_SFLG_EXITING));
+        proc->flags |= F_DISTRIBUTION;
+        ERTS_PROC_SET_DIST_ENTRY(proc, dep);
 
-    if (pp->dist_entry || is_not_nil(dep->cid))
-	goto badarg;
+        proc_unlock &= ~ERTS_PROC_LOCK_STATUS;
+        erts_proc_unlock(proc, ERTS_PROC_LOCK_STATUS);
 
-    erts_atomic32_read_bor_nob(&pp->state, ERTS_PORT_SFLG_DISTRIBUTION);
+        dep->send = NULL; /* Only for distr ports... */
 
-    /*
-     * Dist-ports do not use the "busy port message queue" functionality, but
-     * instead use "busy dist entry" functionality.
-     */
-    {
-	ErlDrvSizeT disable = ERL_DRV_BUSY_MSGQ_DISABLED;
-	erl_drv_busy_msgq_limits(ERTS_Port2ErlDrvPort(pp), &disable, NULL);
     }
+    else {
 
-    pp->dist_entry = dep;
+        pp = erts_id2port_sflgs(BIF_ARG_2,
+                                BIF_P,
+                                ERTS_PROC_LOCK_MAIN,
+                                ERTS_PORT_SFLGS_INVALID_LOOKUP);
+        erts_de_rwlock(dep);
+
+        if (!pp || (erts_atomic32_read_nob(&pp->state)
+                    & ERTS_PORT_SFLG_EXITING))
+            goto badarg;
+
+        if ((pp->drv_ptr->flags & ERL_DRV_FLAG_SOFT_BUSY) == 0)
+            goto badarg;
+
+        if (dep->cid == BIF_ARG_2 && pp->dist_entry == dep)
+            goto done; /* Already set */
+
+        if (dep->status & ERTS_DE_SFLG_EXITING) {
+            /* Suspend on dist entry waiting for the exit to finish */
+            ErtsProcList *plp = erts_proclist_create(BIF_P);
+            plp->next = NULL;
+            erts_suspend(BIF_P, ERTS_PROC_LOCK_MAIN, NULL);
+            erts_mtx_lock(&dep->qlock);
+            erts_proclist_store_last(&dep->suspended, plp);
+            erts_mtx_unlock(&dep->qlock);
+            goto yield;
+        }
 
-    dep->version = version;
-    dep->creation = 0;
+        ASSERT(!(dep->status & ERTS_DE_SFLG_EXITING));
 
-    ASSERT(pp->drv_ptr->outputv || pp->drv_ptr->output);
+        if (pp->dist_entry || is_not_nil(dep->cid))
+            goto badarg;
 
-#if 1
-    dep->send = (pp->drv_ptr->outputv
-		 ? dist_port_commandv
-		 : dist_port_command);
-#else
-    dep->send = dist_port_command;
-#endif
-    ASSERT(dep->send);
+        erts_atomic32_read_bor_nob(&pp->state, ERTS_PORT_SFLG_DISTRIBUTION);
+
+        pp->dist_entry = dep;
+
+        ASSERT(pp->drv_ptr->outputv || pp->drv_ptr->output);
+
+        dep->send = (pp->drv_ptr->outputv
+                     ? dist_port_commandv
+                     : dist_port_command);
+        ASSERT(dep->send);
+
+        /*
+         * Dist-ports do not use the "busy port message queue" functionality, but
+         * instead use "busy dist entry" functionality.
+         */
+        {
+            ErlDrvSizeT disable = ERL_DRV_BUSY_MSGQ_DISABLED;
+            erl_drv_busy_msgq_limits(ERTS_Port2ErlDrvPort(pp), &disable, NULL);
+        }
+
+    }
+
+    dep->version = version;
+    dep->creation = 0;
 
 #ifdef DEBUG
-    erts_mtx_lock(&dep->qlock);
-    ASSERT(dep->qsize == 0);
-    erts_mtx_unlock(&dep->qlock);
+    ASSERT(erts_atomic_read_nob(&dep->qsize) == 0);
 #endif
 
-    erts_set_dist_entry_connected(dep, BIF_ARG_2, flags);
-
     if (flags & DFLAG_DIST_HDR_ATOM_CACHE)
 	create_cache(dep);
 
+    erts_set_dist_entry_connected(dep, BIF_ARG_2, flags);
+
     erts_de_rwunlock(dep);
+
+    ERTS_BIF_PREP_RET(ret, erts_make_dhandle(BIF_P, dep));
+
     dep = NULL; /* inc of refc transferred to port (dist_entry field) */
 
     inc_no_nodes();
@@ -2836,6 +3409,9 @@ BIF_RETTYPE setnode_3(BIF_ALIST_3)
     if (pp)
 	erts_port_release(pp);
 
+    if (proc_unlock)
+        erts_proc_unlock(proc, proc_unlock);
+
     return ret;
 
  yield:
@@ -3138,7 +3714,6 @@ monitor_node(Process* p, Eterm Node, Eterm Bool, Eterm Options)
     erts_proc_unlock(p, ERTS_PROC_LOCK_LINK);
 
  done:
-    erts_deref_dist_entry(dep);
     BIF_RET(am_true);
 }
 
diff --git a/erts/emulator/beam/dist.h b/erts/emulator/beam/dist.h
index 05016cafc5..d4765c50b8 100644
--- a/erts/emulator/beam/dist.h
+++ b/erts/emulator/beam/dist.h
@@ -44,6 +44,7 @@
 #define DFLAG_UTF8_ATOMS          0x10000
 #define DFLAG_MAP_TAG             0x20000
 #define DFLAG_BIG_CREATION        0x40000
+#define DFLAG_SEND_SENDER         0x80000
 
 /* All flags that should be enabled when term_to_binary/1 is used. */
 #define TERM_TO_BINARY_DFLAGS (DFLAG_EXTENDED_REFERENCES	\
@@ -74,6 +75,9 @@
 #define DOP_DEMONITOR_P		20
 #define DOP_MONITOR_P_EXIT	21
 
+#define DOP_SEND_SENDER         22
+#define DOP_SEND_SENDER_TT      23
+
 /* distribution trap functions */
 extern Export* dsend2_trap;
 extern Export* dsend3_trap;
@@ -161,13 +165,10 @@ erts_dsig_prepare(ErtsDSigData *dsdp,
 	goto fail;
     }
     if (no_suspend) {
-	failure = ERTS_DSIG_PREP_CONNECTED;
-	erts_mtx_lock(&dep->qlock);
-	if (dep->qflgs & ERTS_DE_QFLG_BUSY)
+        if (erts_atomic32_read_acqb(&dep->qflgs) & ERTS_DE_QFLG_BUSY) {
 	    failure = ERTS_DSIG_PREP_WOULD_SUSPEND;
-	erts_mtx_unlock(&dep->qlock);
-	if (failure == ERTS_DSIG_PREP_WOULD_SUSPEND)
 	    goto fail;
+        }
     }
     dsdp->proc = proc;
     dsdp->dep = dep;
@@ -349,6 +350,7 @@ typedef struct {
     Eterm ctl_heap[6];
     ErtsDSigData dsd;
     DistEntry* dep_to_deref;
+    DistEntry *dep;
     struct erts_dsig_send_context dss;
 
     Eterm return_term;
diff --git a/erts/emulator/beam/erl_bif_info.c b/erts/emulator/beam/erl_bif_info.c
index 2ff95a3338..d0942ccef8 100644
--- a/erts/emulator/beam/erl_bif_info.c
+++ b/erts/emulator/beam/erl_bif_info.c
@@ -3750,7 +3750,6 @@ BIF_RETTYPE erts_debug_get_internal_state_1(BIF_ALIST_1)
 			subres = make_link_list(BIF_P, dep->nlinks, NIL);
 			subres = make_link_list(BIF_P, dep->node_links, subres);
 			erts_de_links_unlock(dep);
-			erts_deref_dist_entry(dep);
 			BIF_RET(subres);
 		    } else {
 			BIF_RET(am_undefined);
@@ -3781,7 +3780,6 @@ BIF_RETTYPE erts_debug_get_internal_state_1(BIF_ALIST_1)
 			erts_de_links_lock(dep);
 			ml = make_monitor_list(BIF_P, dep->monitors);
 			erts_de_links_unlock(dep);
-			erts_deref_dist_entry(dep);
 			BIF_RET(ml);
 		    } else {
 			BIF_RET(am_undefined);
@@ -3796,7 +3794,6 @@ BIF_RETTYPE erts_debug_get_internal_state_1(BIF_ALIST_1)
 		else {
 		    Uint cno = dist_entry_channel_no(dep);
 		    res = make_small(cno);
-		    erts_deref_dist_entry(dep);
 		}
 		BIF_RET(res);
 	    }
@@ -3858,15 +3855,14 @@ BIF_RETTYPE erts_debug_get_internal_state_1(BIF_ALIST_1)
 			       DFLAG_BIT_BINARIES);
 		BIF_RET(erts_term_to_binary(BIF_P, tp[2], 0, dflags));
 	    }
-	    else if (ERTS_IS_ATOM_STR("dist_port", tp[1])) {
+	    else if (ERTS_IS_ATOM_STR("dist_ctrl", tp[1])) {
 		Eterm res = am_undefined;
 		DistEntry *dep = erts_sysname_to_connected_dist_entry(tp[2]);
 		if (dep) {
 		    erts_de_rlock(dep);
-		    if (is_internal_port(dep->cid))
+		    if (is_internal_port(dep->cid) || is_internal_pid(dep->cid))
 			res = dep->cid;
 		    erts_de_runlock(dep);
-		    erts_deref_dist_entry(dep);
 		}
 		BIF_RET(res);
 	    }
@@ -4275,7 +4271,6 @@ BIF_RETTYPE erts_debug_set_internal_state_2(BIF_ALIST_2)
 		con_id = dep->connection_id;
 		erts_de_runlock(dep);
 		erts_kill_dist_connection(dep, con_id);
-		erts_deref_dist_entry(dep);
 		BIF_RET(am_true);
 	    }
 	}
diff --git a/erts/emulator/beam/erl_monitors.c b/erts/emulator/beam/erl_monitors.c
index 67c552b364..1c840d89f6 100644
--- a/erts/emulator/beam/erl_monitors.c
+++ b/erts/emulator/beam/erl_monitors.c
@@ -993,7 +993,6 @@ Eterm erts_debug_dump_monitors_1(BIF_ALIST_1)
 	    erts_dump_monitors(dep->monitors,0);
 	    erts_de_links_unlock(dep);
 	    erts_printf("Monitors dumped-------------------------\n");
-	    erts_deref_dist_entry(dep);
 	    BIF_RET(am_true);
 	} else {
 	    BIF_ERROR(p,BADARG);
@@ -1038,7 +1037,6 @@ Eterm erts_debug_dump_links_1(BIF_ALIST_1)
 		erts_dump_links(dep->nlinks,0);
 		erts_de_links_unlock(dep);
 		erts_printf("Links dumped----------------------------\n");
-		erts_deref_dist_entry(dep);
 		BIF_RET(am_true);
 	    } else {
 		BIF_ERROR(p,BADARG);
diff --git a/erts/emulator/beam/erl_node_tables.c b/erts/emulator/beam/erl_node_tables.c
index f8e9fec27a..0f3dfa797c 100644
--- a/erts/emulator/beam/erl_node_tables.c
+++ b/erts/emulator/beam/erl_node_tables.c
@@ -29,6 +29,8 @@
 #include "error.h"
 #include "erl_thr_progress.h"
 #include "dtrace-wrapper.h"
+#include "erl_binary.h"
+#include "erl_bif_unique.h"
 
 Hash erts_dist_table;
 Hash erts_node_table;
@@ -57,6 +59,58 @@ static ErtsMonotonicTime node_tab_delete_delay;
 
 /* -- The distribution table ---------------------------------------------- */
 
+#define ErtsBin2DistEntry(B) \
+    ((DistEntry *) ERTS_MAGIC_BIN_DATA((B)))
+#define ErtsDistEntry2Bin(DEP) \
+    ((Binary *) ERTS_MAGIC_BIN_FROM_DATA((DEP)))
+
+static ERTS_INLINE erts_aint_t
+de_refc_read(DistEntry *dep, erts_aint_t min)
+{
+    return erts_refc_read(&ErtsDistEntry2Bin(dep)->intern.refc, min);
+}
+
+static ERTS_INLINE erts_aint_t
+de_refc_inc_read(DistEntry *dep, erts_aint_t min)
+{
+    return erts_refc_inctest(&ErtsDistEntry2Bin(dep)->intern.refc, min);
+}
+
+static ERTS_INLINE void
+de_refc_inc(DistEntry *dep, erts_aint_t min)
+{
+    erts_refc_inc(&ErtsDistEntry2Bin(dep)->intern.refc, min);
+}
+
+static ERTS_INLINE void
+de_refc_dec(DistEntry *dep, erts_aint_t min)
+{
+#ifdef DEBUG
+    (void) erts_refc_read(&ErtsDistEntry2Bin(dep)->intern.refc, min+1);
+#endif
+    erts_bin_release(ErtsDistEntry2Bin(dep));
+}
+
+static ERTS_INLINE erts_aint_t
+de_refc_dec_read(DistEntry *dep, erts_aint_t min)
+{
+    return erts_refc_dectest(&ErtsDistEntry2Bin(dep)->intern.refc, min);
+}
+
+void
+erts_ref_dist_entry(DistEntry *dep)
+{
+    ASSERT(dep);
+    de_refc_inc(dep, 1);
+}
+
+void
+erts_deref_dist_entry(DistEntry *dep)
+{
+    ASSERT(dep);
+    de_refc_dec(dep, 0);
+}
+
 #ifdef DEBUG
 static int
 is_in_de_list(DistEntry *dep, DistEntry *dep_list)
@@ -85,22 +139,39 @@ dist_table_cmp(void *dep1, void *dep2)
 static void*
 dist_table_alloc(void *dep_tmpl)
 {
+#ifdef DEBUG
+    erts_aint_t refc;
+#endif
     Eterm sysname;
+    Binary *bin;
     DistEntry *dep;
     erts_rwmtx_opt_t rwmtx_opt = ERTS_RWMTX_OPT_DEFAULT_INITER;
     rwmtx_opt.type = ERTS_RWMTX_TYPE_FREQUENT_READ;
 
     sysname = ((DistEntry *) dep_tmpl)->sysname;
-    dep = (DistEntry *) erts_alloc(ERTS_ALC_T_DIST_ENTRY, sizeof(DistEntry));
+
+    bin = erts_create_magic_binary_x(sizeof(DistEntry),
+                                     erts_dist_entry_destructor,
+                                     ERTS_ALC_T_DIST_ENTRY,
+                                     0);
+    dep = ErtsBin2DistEntry(bin);
 
     dist_entries++;
 
+#ifdef DEBUG
+    refc =
+#else
+    (void)
+#endif
+        de_refc_dec_read(dep, -1);
+    ASSERT(refc == -1);
+
     dep->prev				= NULL;
-    erts_refc_init(&dep->refc, -1);
     erts_rwmtx_init_opt(&dep->rwmtx, &rwmtx_opt, "dist_entry", sysname,
         ERTS_LOCK_FLAGS_CATEGORY_DISTRIBUTION);
     dep->sysname			= sysname;
     dep->cid				= NIL;
+    erts_atomic_init_nob(&dep->input_handler, (erts_aint_t) NIL);
     dep->connection_id			= 0;
     dep->status				= 0;
     dep->flags				= 0;
@@ -114,12 +185,16 @@ dist_table_alloc(void *dep_tmpl)
 
     erts_mtx_init(&dep->qlock, "dist_entry_out_queue", sysname,
         ERTS_LOCK_FLAGS_CATEGORY_DISTRIBUTION);
-    dep->qflgs				= 0;
-    dep->qsize				= 0;
+    erts_atomic32_init_nob(&dep->qflgs, 0);
+    erts_atomic_init_nob(&dep->qsize, 0);
+    erts_atomic64_init_nob(&dep->in, 0);
+    erts_atomic64_init_nob(&dep->out, 0);
     dep->out_queue.first		= NULL;
     dep->out_queue.last			= NULL;
     dep->suspended			= NULL;
 
+    dep->tmp_out_queue.first    	= NULL;
+    dep->tmp_out_queue.last     	= NULL;
     dep->finalized_out_queue.first	= NULL;
     dep->finalized_out_queue.last	= NULL;
 
@@ -181,7 +256,7 @@ dist_table_free(void *vdep)
 #ifdef DEBUG
     sys_memset(vdep, 0x77, sizeof(DistEntry));
 #endif
-    erts_free(ERTS_ALC_T_DIST_ENTRY, (void *) dep);
+    erts_bin_free(ErtsDistEntry2Bin(dep));
 
     ASSERT(dist_entries > 0);
     dist_entries--;
@@ -199,19 +274,52 @@ erts_dist_table_info(fmtfn_t to, void *to_arg)
 	erts_rwmtx_runlock(&erts_dist_table_rwmtx);
 }
 
+static ERTS_INLINE DistEntry *find_dist_entry(Eterm sysname,
+                                              int inc_refc,
+                                              int connected_only)
+{
+    DistEntry *res;
+    DistEntry de;
+    de.sysname = sysname;
+    erts_rwmtx_rlock(&erts_dist_table_rwmtx);
+    res = hash_get(&erts_dist_table, (void *) &de);
+    if (res) {
+        if (connected_only && is_nil(res->cid))
+            res = NULL;
+        else {
+            int pend_delete;
+            erts_aint_t refc;
+            if (inc_refc) {
+                refc = de_refc_inc_read(res, 1);
+                pend_delete = refc < 2;
+            }
+            else {
+                refc = de_refc_read(res, 0);
+                pend_delete = refc < 1;
+            }
+            if (pend_delete) /* Pending delete */
+                de_refc_inc(res, 1);
+        }
+    }
+    erts_rwmtx_runlock(&erts_dist_table_rwmtx);
+    return res;
+}
+
 DistEntry *
 erts_channel_no_to_dist_entry(Uint cno)
 {
+    /*
+     * Does NOT increase reference count!
+     */
+
 /*
  * For this node (and previous incarnations of this node),
  * ERST_INTERNAL_CHANNEL_NO (will always be 0 I guess) is used as
  * channel no. For other nodes, the atom index of the atom corresponding
  * to the node name is used as channel no.
  */
-    if(cno == ERST_INTERNAL_CHANNEL_NO) {
-	erts_refc_inc(&erts_this_dist_entry->refc, 2);
+    if (cno == ERST_INTERNAL_CHANNEL_NO)
 	return erts_this_dist_entry;
-    }
 
     if((cno > MAX_ATOM_INDEX)
        || (cno >= atom_table_size())
@@ -220,80 +328,97 @@ erts_channel_no_to_dist_entry(Uint cno)
         
     /* cno is a valid atom index; find corresponding dist entry (if there
        is one) */
-    return erts_find_dist_entry(make_atom(cno));
+    return find_dist_entry(make_atom(cno), 0, 0);
 }
 
-
 DistEntry *
 erts_sysname_to_connected_dist_entry(Eterm sysname)
 {
-    DistEntry de;
-    DistEntry *res_dep;
-    de.sysname = sysname;
-  
-    if(erts_this_dist_entry->sysname == sysname) {
-	erts_refc_inc(&erts_this_dist_entry->refc, 2);
+    /*
+     * Does NOT increase reference count!
+     */
+    if(erts_this_dist_entry->sysname == sysname)
 	return erts_this_dist_entry;
-    }
-
-    erts_rwmtx_rlock(&erts_dist_table_rwmtx);
-    res_dep = (DistEntry *) hash_get(&erts_dist_table, (void *) &de);
-    if (res_dep) {
-	erts_aint_t refc = erts_refc_inctest(&res_dep->refc, 1);
-	if (refc < 2) /* Pending delete */
-	    erts_refc_inc(&res_dep->refc, 1);
-    }
-    erts_rwmtx_runlock(&erts_dist_table_rwmtx);
-    if (res_dep) {
-	int deref;
-	erts_rwmtx_rlock(&res_dep->rwmtx);
-	deref = is_nil(res_dep->cid);
-	erts_rwmtx_runlock(&res_dep->rwmtx);
-	if (deref) {
-	    erts_deref_dist_entry(res_dep);
-	    res_dep = NULL;
-	}
-    }
-    return res_dep;
+    return find_dist_entry(sysname, 0, 1);
 }
 
 DistEntry *erts_find_or_insert_dist_entry(Eterm sysname)
 {
+    /*
+     * This function DOES increase reference count!
+     */
     DistEntry *res;
     DistEntry de;
     erts_aint_t refc;
-    res = erts_find_dist_entry(sysname);
+    res = find_dist_entry(sysname, 1, 0);
     if (res)
 	return res;
     de.sysname = sysname;
     erts_rwmtx_rwlock(&erts_dist_table_rwmtx);
     res = hash_put(&erts_dist_table, (void *) &de);
-    refc = erts_refc_inctest(&res->refc, 0);
+    refc = de_refc_inc_read(res, 0);
     if (refc < 2) /* New or pending delete */
-	erts_refc_inc(&res->refc, 1);
+        de_refc_inc(res, 1);
     erts_rwmtx_rwunlock(&erts_dist_table_rwmtx);
     return res;
 }
 
 DistEntry *erts_find_dist_entry(Eterm sysname)
 {
-    DistEntry *res;
-    DistEntry de;
-    de.sysname = sysname;
-    erts_rwmtx_rlock(&erts_dist_table_rwmtx);
-    res = hash_get(&erts_dist_table, (void *) &de);
-    if (res) {
-	erts_aint_t refc = erts_refc_inctest(&res->refc, 1);
-	if (refc < 2) /* Pending delete */
-	    erts_refc_inc(&res->refc, 1);
-    }
-    erts_rwmtx_runlock(&erts_dist_table_rwmtx);
-    return res;
+    /*
+     * Does NOT increase reference count!
+     */
+    return find_dist_entry(sysname, 0, 0);
 }
 
-static void try_delete_dist_entry(void *vdep)
+DistEntry *
+erts_dhandle_to_dist_entry(Eterm dhandle)
 {
-    DistEntry *dep = (DistEntry *) vdep;
+    Binary *bin;
+    if (!is_internal_magic_ref(dhandle))
+        return NULL;
+    bin = erts_magic_ref2bin(dhandle);
+    if (ERTS_MAGIC_BIN_DESTRUCTOR(bin) != erts_dist_entry_destructor)
+        return NULL;
+    return ErtsBin2DistEntry(bin);
+}
+
+Eterm
+erts_make_dhandle(Process *c_p, DistEntry *dep)
+{
+    Binary *bin;
+    Eterm *hp;
+
+    bin = ErtsDistEntry2Bin(dep);
+    ASSERT(bin);
+    ASSERT(ERTS_MAGIC_BIN_DESTRUCTOR(bin) == erts_dist_entry_destructor);
+    hp = HAlloc(c_p, ERTS_MAGIC_REF_THING_SIZE);
+    return erts_mk_magic_ref(&hp, &c_p->off_heap, bin);
+}
+
+static void try_delete_dist_entry(void *vbin);
+
+static void
+prepare_try_delete_dist_entry(void *vbin)
+{
+    Binary *bin = (Binary *) vbin;
+    DistEntry *dep = ErtsBin2DistEntry(bin);
+    Uint size;
+    erts_aint_t refc;
+
+    refc = de_refc_read(dep, 0);
+    if (refc > 0)
+        return;
+
+    size = ERTS_MAGIC_BIN_SIZE(sizeof(DistEntry));
+    erts_schedule_thr_prgr_later_cleanup_op(try_delete_dist_entry,
+                                            vbin, &dep->later_op, size);
+}
+
+static void try_delete_dist_entry(void *vbin)
+{
+    Binary *bin = (Binary *) vbin;
+    DistEntry *dep = ErtsBin2DistEntry(bin);
     erts_aint_t refc;
 
     erts_rwmtx_rwlock(&erts_dist_table_rwmtx);
@@ -312,26 +437,39 @@ static void try_delete_dist_entry(void *vdep)
      *
      * If refc > 0, the entry is in use. Keep the entry.
      */
-    refc = erts_refc_dectest(&dep->refc, -1);
+    refc = de_refc_dec_read(dep, -1);
     if (refc == -1)
 	(void) hash_erase(&erts_dist_table, (void *) dep);
     erts_rwmtx_rwunlock(&erts_dist_table_rwmtx);
 
-    if (refc == 0)
-	erts_schedule_delete_dist_entry(dep);
+    if (refc == 0) {
+        if (node_tab_delete_delay == 0)
+            prepare_try_delete_dist_entry(vbin);
+        else if (node_tab_delete_delay > 0)
+            erts_start_timer_callback(node_tab_delete_delay,
+                                      prepare_try_delete_dist_entry,
+                                      vbin);
+    }
 }
 
-void erts_schedule_delete_dist_entry(DistEntry *dep)
+int erts_dist_entry_destructor(Binary *bin)
 {
-    ASSERT(dep != erts_this_dist_entry);
-    if (dep != erts_this_dist_entry) {
-	if (node_tab_delete_delay == 0)
-	    try_delete_dist_entry((void *) dep);
-	else if (node_tab_delete_delay > 0)
-	    erts_start_timer_callback(node_tab_delete_delay,
-				      try_delete_dist_entry,
-				      (void *) dep);
-    }
+    DistEntry *dep = ErtsBin2DistEntry(bin);
+    erts_aint_t refc;
+
+    refc = de_refc_read(dep, -1);
+
+    if (refc == -1)
+        return 1; /* Allow deallocation of structure... */
+
+    if (node_tab_delete_delay == 0)
+        prepare_try_delete_dist_entry((void *) bin);
+    else if (node_tab_delete_delay > 0)
+        erts_start_timer_callback(node_tab_delete_delay,
+                                  prepare_try_delete_dist_entry,
+                                  (void *) bin);
+
+    return 0;
 }
 
 Uint
@@ -384,7 +522,7 @@ erts_set_dist_entry_not_connected(DistEntry *dep)
     erts_rwmtx_rwlock(&erts_dist_table_rwmtx);
 
     ASSERT(dep != erts_this_dist_entry);
-    ASSERT(is_internal_port(dep->cid));
+    ASSERT(is_internal_port(dep->cid) || is_internal_pid(dep->cid));
 
     if(dep->flags & DFLAG_PUBLISHED) {
 	if(dep->prev) {
@@ -439,7 +577,7 @@ erts_set_dist_entry_connected(DistEntry *dep, Eterm cid, Uint flags)
 
     ASSERT(dep != erts_this_dist_entry);
     ASSERT(is_nil(dep->cid));
-    ASSERT(is_internal_port(cid));
+    ASSERT(is_internal_port(cid) || is_internal_pid(cid));
 
     if(dep->prev) {
 	ASSERT(is_in_de_list(dep, erts_not_connected_dist_entries));
@@ -459,10 +597,19 @@ erts_set_dist_entry_connected(DistEntry *dep, Eterm cid, Uint flags)
     dep->status |= ERTS_DE_SFLG_CONNECTED;
     dep->flags = flags;
     dep->cid = cid;
+    erts_atomic_set_nob(&dep->input_handler,
+                            (erts_aint_t) cid);
+
     dep->connection_id++;
     dep->connection_id &= ERTS_DIST_EXT_CON_ID_MASK;
     dep->prev = NULL;
 
+    erts_atomic64_set_nob(&dep->in, 0);
+    erts_atomic64_set_nob(&dep->out, 0);
+    erts_atomic32_set_nob(&dep->qflgs,
+                          (is_internal_port(cid)
+                           ? ERTS_DE_QFLG_PORT_CTRL
+                           : ERTS_DE_QFLG_PROC_CTRL));
     if(flags & DFLAG_PUBLISHED) {
 	dep->next = erts_visible_dist_entries;
 	if(erts_visible_dist_entries) {
@@ -716,19 +863,18 @@ void
 erts_set_this_node(Eterm sysname, Uint creation)
 {
     ERTS_LC_ASSERT(erts_thr_progress_is_blocking());
-    ASSERT(erts_refc_read(&erts_this_dist_entry->refc, 2));
+    ASSERT(2 <= de_refc_read(erts_this_dist_entry, 2));
 
     if (erts_refc_dectest(&erts_this_node->refc, 0) == 0)
         try_delete_node(erts_this_node);
 
-    if (erts_refc_dectest(&erts_this_dist_entry->refc, 0) == 0)
-        try_delete_dist_entry(erts_this_dist_entry);
+    erts_deref_dist_entry(erts_this_dist_entry);
 
     erts_this_node = NULL; /* to make sure refc is bumped for this node */
     erts_this_node = erts_find_or_insert_node(sysname, creation);
     erts_this_dist_entry = erts_this_node->dist_entry;
 
-    erts_refc_inc(&erts_this_dist_entry->refc, 2);
+    erts_ref_dist_entry(erts_this_dist_entry);
 
     erts_this_node_sysname = erts_this_node_sysname_BUFFER;
     erts_snprintf(erts_this_node_sysname, sizeof(erts_this_node_sysname_BUFFER),
@@ -797,9 +943,9 @@ void erts_init_node_tables(int dd_sec)
     ASSERT(erts_this_node->dist_entry != NULL);
     erts_this_dist_entry = erts_this_node->dist_entry;
     /* +1 for erts_this_dist_entry */
-    /* +1 for erts_this_node->dist_entry */
-    erts_refc_init(&erts_this_dist_entry->refc, 2);
+    erts_ref_dist_entry(erts_this_dist_entry);
 
+    ASSERT(2 == de_refc_read(erts_this_dist_entry, 2));
 
     erts_this_node_sysname = erts_this_node_sysname_BUFFER;
     erts_snprintf(erts_this_node_sysname, sizeof(erts_this_node_sysname_BUFFER),
@@ -876,6 +1022,7 @@ static Eterm AM_node_references;
 static Eterm AM_system;
 static Eterm AM_timer;
 static Eterm AM_delayed_delete_timer;
+static Eterm AM_thread_progress_delete_timer;
 
 static void setup_reference_table(void);
 static Eterm reference_table_term(Uint **hpp, ErlOffHeap *ohp, Uint *szp);
@@ -965,6 +1112,7 @@ erts_get_node_and_dist_references(struct process *proc)
 	INIT_AM(timer);
 	INIT_AM(system);
 	INIT_AM(delayed_delete_timer);
+        INIT_AM(thread_progress_delete_timer);
 	references_atoms_need_init = 0;
     }
 
@@ -1148,6 +1296,10 @@ insert_offheap2(ErlOffHeap *oh, void *arg)
     insert_offheap(oh, a->type, a->id);
 }
 
+#define ErtsIsDistEntryBinary(Bin)                                      \
+    (((Bin)->intern.flags & BIN_FLAG_MAGIC)                             \
+     && ERTS_MAGIC_BIN_DESTRUCTOR((Bin)) == erts_dist_entry_destructor)
+
 static void
 insert_offheap(ErlOffHeap *oh, int type, Eterm id)
 {
@@ -1158,7 +1310,10 @@ insert_offheap(ErlOffHeap *oh, int type, Eterm id)
     for (u.hdr = oh->first; u.hdr; u.hdr = u.hdr->next) {
 	switch (thing_subtag(u.hdr->thing_word)) {
 	case REF_SUBTAG:
-	    if(IsMatchProgBinary(u.mref->mb)) {
+            if (ErtsIsDistEntryBinary(u.mref->mb))
+                insert_dist_entry(ErtsBin2DistEntry(u.mref->mb),
+                                  type, id, 0);
+	    else if(IsMatchProgBinary(u.mref->mb)) {
 		InsertedBin *ib;
 		int insert_bin = 1;
 		for (ib = inserted_bins; ib; ib = ib->next)
@@ -1301,26 +1456,34 @@ insert_delayed_delete_node(void *state,
 			   ErtsMonotonicTime timeout_pos,
 			   void *vnp)
 {
-    DeclareTmpHeapNoproc(heap,3);
-    UseTmpHeapNoproc(3);
+    Eterm heap[3];
     insert_node((ErlNode *) vnp,
 		SYSTEM_REF,
 		TUPLE2(&heap[0], AM_system, AM_delayed_delete_timer));
-    UnUseTmpHeapNoproc(3);
+}
+
+static void
+insert_thr_prgr_delete_dist_entry(void *arg, ErtsThrPrgrVal thr_prgr, void *vbin)
+{
+    DistEntry *dep = ErtsBin2DistEntry(vbin);
+    Eterm heap[3];
+    insert_dist_entry(dep,
+		      SYSTEM_REF,
+		      TUPLE2(&heap[0], AM_system, AM_thread_progress_delete_timer),
+		      0);
 }
 
 static void
 insert_delayed_delete_dist_entry(void *state,
 				 ErtsMonotonicTime timeout_pos,
-				 void *vdep)
+				 void *vbin)
 {
-    DeclareTmpHeapNoproc(heap,3);
-    UseTmpHeapNoproc(3);
-    insert_dist_entry((DistEntry *) vdep,
+    DistEntry *dep = ErtsBin2DistEntry(vbin);
+    Eterm heap[3];
+    insert_dist_entry(dep,
 		      SYSTEM_REF,
 		      TUPLE2(&heap[0], AM_system, AM_delayed_delete_timer),
 		      0);
-    UnUseTmpHeapNoproc(3);
 }
 
 static void
@@ -1354,9 +1517,12 @@ setup_reference_table(void)
     erts_debug_callback_timer_foreach(try_delete_node,
 				      insert_delayed_delete_node,
 				      NULL);
-    erts_debug_callback_timer_foreach(try_delete_dist_entry,
+    erts_debug_callback_timer_foreach(prepare_try_delete_dist_entry,
 				      insert_delayed_delete_dist_entry,
 				      NULL);
+    erts_debug_later_op_foreach(try_delete_dist_entry,
+                                insert_thr_prgr_delete_dist_entry,
+                                NULL);
 
     UseTmpHeapNoproc(3);
     insert_node(erts_this_node,
@@ -1421,6 +1587,14 @@ setup_reference_table(void)
 		insert_links(ERTS_P_LINKS(proc), proc->common.id);
 	    if (ERTS_P_MONITORS(proc))
 		insert_monitors(ERTS_P_MONITORS(proc), proc->common.id);
+            {
+                DistEntry *dep = ERTS_PROC_GET_DIST_ENTRY(proc);
+                if (dep)
+                    insert_dist_entry(dep,
+                                      CTRL_REF,
+                                      proc->common.id,
+                                      0);
+            }
 	}
     }
     
@@ -1719,7 +1893,7 @@ reference_table_term(Uint **hpp, ErlOffHeap *ohp, Uint *szp)
 
 	/* DistList = [{Dist, Refc, ReferenceIdList}] */
 	tup = MK_3TUP(referred_dists[i].dist->sysname,
-		      MK_UINT(erts_refc_read(&referred_dists[i].dist->refc, 0)),
+		      MK_UINT(de_refc_read(referred_dists[i].dist, 0)),
 		      dril);
 	dl = MK_CONS(tup, dl);
     }
diff --git a/erts/emulator/beam/erl_node_tables.h b/erts/emulator/beam/erl_node_tables.h
index 7974b25444..3bba673435 100644
--- a/erts/emulator/beam/erl_node_tables.h
+++ b/erts/emulator/beam/erl_node_tables.h
@@ -47,6 +47,9 @@
 #define ERTS_PORT_TASK_ONLY_BASIC_TYPES__
 #include "erl_port_task.h"
 #undef ERTS_PORT_TASK_ONLY_BASIC_TYPES__
+#define ERTS_BINARY_TYPES_ONLY__
+#include "erl_binary.h"
+#undef ERTS_BINARY_TYPES_ONLY__
 
 #define ERTS_NODE_TAB_DELAY_GC_DEFAULT (60)
 #define ERTS_NODE_TAB_DELAY_GC_MAX (100*1000*1000)
@@ -60,11 +63,17 @@
 #define ERTS_DE_SFLGS_ALL			(ERTS_DE_SFLG_CONNECTED \
 						 | ERTS_DE_SFLG_EXITING)
 
-#define ERTS_DE_QFLG_BUSY			(((Uint32) 1) <<  0)
-#define ERTS_DE_QFLG_EXIT			(((Uint32) 1) <<  1)
+#define ERTS_DE_QFLG_BUSY			(((erts_aint32_t) 1) <<  0)
+#define ERTS_DE_QFLG_EXIT			(((erts_aint32_t) 1) <<  1)
+#define ERTS_DE_QFLG_REQ_INFO			(((erts_aint32_t) 1) <<  2)
+#define ERTS_DE_QFLG_PORT_CTRL                  (((erts_aint32_t) 1) <<  3)
+#define ERTS_DE_QFLG_PROC_CTRL                  (((erts_aint32_t) 1) <<  4)
 
 #define ERTS_DE_QFLGS_ALL			(ERTS_DE_QFLG_BUSY \
-						 | ERTS_DE_QFLG_EXIT)
+						 | ERTS_DE_QFLG_EXIT \
+                                                 | ERTS_DE_QFLG_REQ_INFO \
+                                                 | ERTS_DE_QFLG_PORT_CTRL \
+                                                 | ERTS_DE_QFLG_PROC_CTRL)
 
 #if defined(ARCH_64)
 #define ERTS_DIST_OUTPUT_BUF_DBG_PATTERN ((Uint) 0xf713f713f713f713UL)
@@ -106,12 +115,13 @@ typedef struct dist_entry_ {
     HashBucket hash_bucket;     /* Hash bucket */
     struct dist_entry_ *next;	/* Next entry in dist_table (not sorted) */
     struct dist_entry_ *prev;	/* Previous entry in dist_table (not sorted) */
-    erts_refc_t refc;		/* Reference count */
 
-    erts_rwmtx_t rwmtx;     /* Protects all fields below until lck_mtx. */
+    erts_rwmtx_t rwmtx;         /* Protects all fields below until lck_mtx. */
     Eterm sysname;		/* name@host atom for efficiency */
     Uint32 creation;		/* creation of connected node */
-    Eterm cid;			/* connection handler (pid or port), NIL == free */
+    erts_atomic_t input_handler; /* Input handler */
+    Eterm cid;			/* connection handler (pid or port),
+                                   NIL == free */
     Uint32 connection_id;	/* Connection id incremented on connect */
     Uint32 status;		/* Slot status, like exiting reserved etc */
     Uint32 flags;		/* Distribution flags, like hidden, 
@@ -119,7 +129,7 @@ typedef struct dist_entry_ {
     unsigned long version;	/* Protocol version */
 
 
-    erts_mtx_t lnk_mtx;     /* Protects node_links, nlinks, and
+    erts_mtx_t lnk_mtx;         /* Protects node_links, nlinks, and
 				   monitors. */
     ErtsLink *node_links;       /* In a dist entry, node links are kept 
 				   in a separate tree, while they are 
@@ -131,12 +141,15 @@ typedef struct dist_entry_ {
     ErtsLink *nlinks;           /* Link tree with subtrees */
     ErtsMonitor *monitors;      /* Monitor tree */
 
-    erts_mtx_t qlock;       /* Protects qflgs and out_queue */
-    Uint32 qflgs;
-    Sint qsize;
+    erts_mtx_t qlock;           /* Protects qflgs and out_queue */
+    erts_atomic32_t qflgs;
+    erts_atomic_t qsize;
+    erts_atomic64_t in;
+    erts_atomic64_t out;
     ErtsDistOutputQueue out_queue;
     struct ErtsProcList_ *suspended;
 
+    ErtsDistOutputQueue tmp_out_queue;
     ErtsDistOutputQueue finalized_out_queue;
     erts_atomic_t dist_cmd_scheduled;
     ErtsPortTaskHandle dist_cmd;
@@ -144,6 +157,8 @@ typedef struct dist_entry_ {
     Uint (*send)(Port *prt, ErtsDistOutputBuf *obuf);
 
     struct cache* cache;	/* The atom cache */
+
+    ErtsThrPrgrLaterOp later_op;
 } DistEntry;
 
 typedef struct erl_node_ {
@@ -193,12 +208,12 @@ Eterm erts_get_node_and_dist_references(struct process *);
 int erts_lc_is_de_rwlocked(DistEntry *);
 int erts_lc_is_de_rlocked(DistEntry *);
 #endif
+int erts_dist_entry_destructor(Binary *bin);
+DistEntry *erts_dhandle_to_dist_entry(Eterm dhandle);
+Eterm erts_make_dhandle(Process *c_p, DistEntry *dep);
+void erts_ref_dist_entry(DistEntry *dep);
+void erts_deref_dist_entry(DistEntry *dep);
 
-#ifdef ERTS_ENABLE_LOCK_COUNT
-void erts_lcnt_update_distribution_locks(int enable);
-#endif
-
-ERTS_GLB_INLINE void erts_deref_dist_entry(DistEntry *dep);
 ERTS_GLB_INLINE void erts_deref_node_entry(ErlNode *np);
 ERTS_GLB_INLINE void erts_de_rlock(DistEntry *dep);
 ERTS_GLB_INLINE void erts_de_runlock(DistEntry *dep);
@@ -210,14 +225,6 @@ ERTS_GLB_INLINE void erts_de_links_unlock(DistEntry *dep);
 #if ERTS_GLB_INLINE_INCL_FUNC_DEF
 
 ERTS_GLB_INLINE void
-erts_deref_dist_entry(DistEntry *dep)
-{
-    ASSERT(dep);
-    if (erts_refc_dectest(&dep->refc, 0) == 0)
-	erts_schedule_delete_dist_entry(dep);
-}
-
-ERTS_GLB_INLINE void
 erts_deref_node_entry(ErlNode *np)
 {
     ASSERT(np);
diff --git a/erts/emulator/beam/erl_process.c b/erts/emulator/beam/erl_process.c
index c29b13c6c1..ab5030e5b9 100644
--- a/erts/emulator/beam/erl_process.c
+++ b/erts/emulator/beam/erl_process.c
@@ -776,6 +776,11 @@ erts_pre_init_process(void)
         = ERTS_PSD_ETS_FIXED_TABLES_GET_LOCKS;
     erts_psd_required_locks[ERTS_PSD_ETS_FIXED_TABLES].set_locks
         = ERTS_PSD_ETS_FIXED_TABLES_SET_LOCKS;
+
+    erts_psd_required_locks[ERTS_PSD_DIST_ENTRY].get_locks
+        = ERTS_PSD_DIST_ENTRY_GET_LOCKS;
+    erts_psd_required_locks[ERTS_PSD_DIST_ENTRY].set_locks
+        = ERTS_PSD_DIST_ENTRY_SET_LOCKS;
 #endif
 }
 
@@ -13082,7 +13087,6 @@ static void doit_exit_monitor(ErtsMonitor *mon, void *vpcontext)
 		    }
 		    erts_destroy_monitor(rmon);
 		}
-		erts_deref_dist_entry(dep);
 	    }
 	} else {
             ASSERT(is_pid(mon->u.pid) || is_port(mon->u.pid));
@@ -13322,7 +13326,6 @@ static void doit_exit_link(ErtsLink *lnk, void *vpcontext)
 	    erts_de_links_unlock(dep);
 	    if (rlnk)
 		erts_destroy_link(rlnk);
-	    erts_deref_dist_entry(dep);
 	}
 	break;
 	
@@ -13430,7 +13433,7 @@ erts_continue_exit_process(Process *p)
     ErtsMonitor *mon;
     ErtsProcLocks curr_locks = ERTS_PROC_LOCK_MAIN;
     Eterm reason = p->fvalue;
-    DistEntry *dep;
+    DistEntry *dep = NULL;
     erts_aint32_t state;
     int delay_del_proc = 0;
 
@@ -13631,13 +13634,16 @@ erts_continue_exit_process(Process *p)
 	if (refc_inced && !(n & ERTS_PSFLG_IN_RUNQ))
 	    erts_proc_dec_refc(p);
     }
-    
-    dep = (p->flags & F_DISTRIBUTION) ? erts_this_dist_entry : NULL;
+
+    dep = ((p->flags & F_DISTRIBUTION)
+           ? ERTS_PROC_SET_DIST_ENTRY(p, NULL)
+           : NULL);
 
     erts_proc_unlock(p, ERTS_PROC_LOCKS_ALL);
 
     if (dep) {
-	erts_do_net_exits(dep, reason);
+        erts_do_net_exits(dep, (reason == am_kill) ? am_killed : reason);
+        erts_deref_dist_entry(dep);
     }
 
     /*
@@ -14045,3 +14051,24 @@ erts_dbg_check_halloc_lock(Process *p)
     return 0;
 }
 #endif
+
+void
+erts_debug_later_op_foreach(void (*callback)(void*),
+                            void (*func)(void *, ErtsThrPrgrVal, void *),
+                            void *arg)
+{
+    int six;
+    if (!erts_thr_progress_is_blocking())
+	ERTS_INTERNAL_ERROR("Not blocking thread progress");
+
+    for (six = 0; six < erts_no_schedulers; six++) {
+        ErtsSchedulerData *esdp = &erts_aligned_scheduler_data[six].esd;
+	ErtsThrPrgrLaterOp *lop = esdp->aux_work_data.later_op.first;
+
+        while (lop) {
+            if (lop->func == callback)
+                func(arg, lop->later, lop->data);
+            lop = lop->next;
+        }
+    }
+}
diff --git a/erts/emulator/beam/erl_process.h b/erts/emulator/beam/erl_process.h
index 7ca37882c2..150f22556c 100644
--- a/erts/emulator/beam/erl_process.h
+++ b/erts/emulator/beam/erl_process.h
@@ -697,6 +697,11 @@ extern ErtsAlignedSchedulerData *erts_aligned_dirty_io_scheduler_data;
 int erts_lc_runq_is_locked(ErtsRunQueue *);
 #endif
 
+void
+erts_debug_later_op_foreach(void (*callback)(void*),
+                            void (*func)(void *, ErtsThrPrgrVal, void *),
+                            void *arg);
+
 #ifdef ERTS_INCLUDE_SCHEDULER_INTERNALS
 
 void erts_empty_runq(ErtsRunQueue *rq);
@@ -803,14 +808,15 @@ erts_reset_max_len(ErtsRunQueue *rq, ErtsRunQueueInfo *rqi)
 #define ERTS_PSD_NIF_TRAP_EXPORT		5
 #define ERTS_PSD_ETS_OWNED_TABLES               6
 #define ERTS_PSD_ETS_FIXED_TABLES               7
-#define ERTS_PSD_SUSPENDED_SAVED_CALLS_BUF	8
+#define ERTS_PSD_DIST_ENTRY	                8
+#define ERTS_PSD_SUSPENDED_SAVED_CALLS_BUF	9 /* keep last... */
 
-#define ERTS_PSD_SIZE				9
+#define ERTS_PSD_SIZE				10
 
 #if !defined(HIPE)
 #  undef ERTS_PSD_SUSPENDED_SAVED_CALLS_BUF
 #  undef ERTS_PSD_SIZE
-#  define ERTS_PSD_SIZE 8
+#  define ERTS_PSD_SIZE 9
 #endif
 
 typedef struct {
@@ -844,6 +850,9 @@ typedef struct {
 #define ERTS_PSD_ETS_FIXED_TABLES_GET_LOCKS ERTS_PROC_LOCK_MAIN
 #define ERTS_PSD_ETS_FIXED_TABLES_SET_LOCKS ERTS_PROC_LOCK_MAIN
 
+#define ERTS_PSD_DIST_ENTRY_GET_LOCKS ERTS_PROC_LOCK_MAIN
+#define ERTS_PSD_DIST_ENTRY_SET_LOCKS ERTS_PROC_LOCK_MAIN
+
 typedef struct {
     ErtsProcLocks get_locks;
     ErtsProcLocks set_locks;
@@ -2041,6 +2050,11 @@ erts_psd_set(Process *p, int ix, void *data)
 #define ERTS_PROC_SET_NIF_TRAP_EXPORT(P, NTE) \
     erts_psd_set((P), ERTS_PSD_NIF_TRAP_EXPORT, (void *) (NTE))
 
+#define ERTS_PROC_GET_DIST_ENTRY(P) \
+    ((DistEntry *) erts_psd_get((P), ERTS_PSD_DIST_ENTRY))
+#define ERTS_PROC_SET_DIST_ENTRY(P, DE) \
+    ((DistEntry *) erts_psd_set((P), ERTS_PSD_DIST_ENTRY, (void *) (DE)))
+
 #ifdef HIPE
 #define ERTS_PROC_GET_SUSPENDED_SAVED_CALLS_BUF(P) \
   ((struct saved_calls *) erts_psd_get((P), ERTS_PSD_SUSPENDED_SAVED_CALLS_BUF))
diff --git a/erts/emulator/beam/external.c b/erts/emulator/beam/external.c
index 0874be7250..1c2f8f9843 100644
--- a/erts/emulator/beam/external.c
+++ b/erts/emulator/beam/external.c
@@ -616,7 +616,7 @@ erts_make_dist_ext_copy(ErtsDistExternal *edep, Uint xsize)
     sys_memcpy((void *) ep, (void *) edep, dist_ext_sz);
     ep += dist_ext_sz;
     if (new_edep->dep)
-	erts_refc_inc(&new_edep->dep->refc, 1);
+        erts_ref_dist_entry(new_edep->dep);
     new_edep->extp = ep;
     new_edep->ext_endp = ep + ext_sz;
     new_edep->heap_size = -1;
@@ -629,7 +629,8 @@ erts_prepare_dist_ext(ErtsDistExternal *edep,
 		      byte *ext,
 		      Uint size,
 		      DistEntry *dep,
-		      ErtsAtomCache *cache)
+		      ErtsAtomCache *cache,
+                      Uint32 *connection_id)
 {
 #undef ERTS_EXT_FAIL
 #undef ERTS_EXT_HDR_FAIL
@@ -650,33 +651,36 @@ erts_prepare_dist_ext(ErtsDistExternal *edep,
     if (size < 2)
 	ERTS_EXT_FAIL;
 
+    if (!dep)
+        ERTS_INTERNAL_ERROR("Invalid use");
+
     if (ep[0] != VERSION_MAGIC) {
 	erts_dsprintf_buf_t *dsbufp = erts_create_logger_dsbuf();
-	if (dep)
-	    erts_dsprintf(dsbufp,
-			  "** Got message from incompatible erlang on "
-			  "channel %d\n",
-			  dist_entry_channel_no(dep));
-	else
-	    erts_dsprintf(dsbufp,
-			  "** Attempt to convert old incompatible "
-			  "binary %d\n",
-			  *ep);
+        erts_dsprintf(dsbufp,
+                      "** Got message from incompatible erlang on "
+                      "channel %d\n",
+                      dist_entry_channel_no(dep));
 	erts_send_error_to_logger_nogl(dsbufp);
 	ERTS_EXT_FAIL;
     }
 
     edep->flags = 0;
     edep->dep = dep;
-    if (dep) {
-	erts_de_rlock(dep);
-	if (dep->flags & DFLAG_DIST_HDR_ATOM_CACHE)
-	    edep->flags |= ERTS_DIST_EXT_DFLAG_HDR;
-	    
-	edep->flags |= (dep->connection_id & ERTS_DIST_EXT_CON_ID_MASK);
-	erts_de_runlock(dep);
+
+    erts_de_rlock(dep);
+
+    if ((dep->status & (ERTS_DE_SFLG_EXITING|ERTS_DE_SFLG_CONNECTED))
+        != ERTS_DE_SFLG_CONNECTED) {
+        erts_de_runlock(dep);
+        return ERTS_PREP_DIST_EXT_CLOSED;
     }
 
+    if (dep->flags & DFLAG_DIST_HDR_ATOM_CACHE)
+        edep->flags |= ERTS_DIST_EXT_DFLAG_HDR;
+
+    *connection_id = dep->connection_id;
+    edep->flags |= (dep->connection_id & ERTS_DIST_EXT_CON_ID_MASK);
+
     if (ep[1] != DIST_HEADER) {
 	if (edep->flags & ERTS_DIST_EXT_DFLAG_HDR)
 	    ERTS_EXT_HDR_FAIL;
@@ -835,14 +839,15 @@ erts_prepare_dist_ext(ErtsDistExternal *edep,
 	ERTS_EXT_FAIL;
 #endif
 
-    return 0;
+    erts_de_runlock(dep);
+
+    return ERTS_PREP_DIST_EXT_SUCCESS;
 
 #undef CHKSIZE
 #undef ERTS_EXT_FAIL
 #undef ERTS_EXT_HDR_FAIL
 
- bad_hdr:
-    if (dep) {
+ bad_hdr: {
 	erts_dsprintf_buf_t *dsbufp = erts_create_logger_dsbuf();
 	erts_dsprintf(dsbufp,
 		      "%T got a corrupted distribution header from %T "
@@ -855,10 +860,11 @@ erts_prepare_dist_ext(ErtsDistExternal *edep,
 	erts_dsprintf(dsbufp, ">>");
 	erts_send_warning_to_logger_nogl(dsbufp);
     }
- fail:
-    if (dep)
-	erts_kill_dist_connection(dep, dep->connection_id);
-    return -1;
+ fail: {
+	erts_de_runlock(dep);
+	erts_kill_dist_connection(dep, *connection_id);
+    }
+    return ERTS_PREP_DIST_EXT_FAILED;
 }
 
 static void
diff --git a/erts/emulator/beam/external.h b/erts/emulator/beam/external.h
index f00426cc16..3c61d013da 100644
--- a/erts/emulator/beam/external.h
+++ b/erts/emulator/beam/external.h
@@ -185,8 +185,13 @@ ERTS_GLB_INLINE void *erts_dist_ext_trailer(ErtsDistExternal *);
 ErtsDistExternal *erts_make_dist_ext_copy(ErtsDistExternal *, Uint);
 void *erts_dist_ext_trailer(ErtsDistExternal *);
 void erts_destroy_dist_ext_copy(ErtsDistExternal *);
+
+#define ERTS_PREP_DIST_EXT_FAILED       (-1)
+#define ERTS_PREP_DIST_EXT_SUCCESS      (0)
+#define ERTS_PREP_DIST_EXT_CLOSED       (1)
+
 int erts_prepare_dist_ext(ErtsDistExternal *, byte *, Uint,
-			  DistEntry *, ErtsAtomCache *);
+			  DistEntry *, ErtsAtomCache *, Uint32 *);
 Sint erts_decode_dist_ext_size(ErtsDistExternal *);
 Eterm erts_decode_dist_ext(ErtsHeapFactory* factory, ErtsDistExternal *);
 
diff --git a/erts/emulator/beam/io.c b/erts/emulator/beam/io.c
index c8925e159e..04108e5f20 100644
--- a/erts/emulator/beam/io.c
+++ b/erts/emulator/beam/io.c
@@ -6682,6 +6682,7 @@ int driver_output_binary(ErlDrvPort ix, char* hbuf, ErlDrvSizeT hlen,
     else
 	erts_atomic64_add_nob(&bytes_in, (erts_aint64_t) (hlen + len));
     if (state & ERTS_PORT_SFLG_DISTRIBUTION) {
+        erts_atomic64_inc_nob(&prt->dist_entry->in);
 	return erts_net_message(prt,
 				prt->dist_entry,
 				(byte*) hbuf, hlen,
@@ -6722,6 +6723,7 @@ int driver_output2(ErlDrvPort ix, char* hbuf, ErlDrvSizeT hlen,
     else
 	erts_atomic64_add_nob(&bytes_in, (erts_aint64_t) (hlen + len));
     if (state & ERTS_PORT_SFLG_DISTRIBUTION) {
+        erts_atomic64_inc_nob(&prt->dist_entry->in);
 	if (len == 0)
 	    return erts_net_message(prt,
 				    prt->dist_entry,
diff --git a/erts/emulator/test/distribution_SUITE.erl b/erts/emulator/test/distribution_SUITE.erl
index b4ec99f902..28be4bfe37 100644
--- a/erts/emulator/test/distribution_SUITE.erl
+++ b/erts/emulator/test/distribution_SUITE.erl
@@ -418,18 +418,20 @@ make_busy(Node, Time) when is_integer(Time) ->
     Own = 500,
     freeze_node(Node, Time+Own),
     Data = make_busy_data(),
+    DCtrl = dctrl(Node),
     %% first make port busy
     Pid = spawn_link(fun () ->
                              forever(fun () ->
-                                             dport_reg_send(Node,
-                                                            '__noone__',
-                                                            Data)
+                                             dctrl_dop_reg_send(Node,
+                                                                '__noone__',
+                                                                Data)
                                      end)
                      end),
     receive after Own -> ok end,
     until(fun () ->
-                  case process_info(Pid, status) of
-                      {status, suspended} -> true;
+                  case {DCtrl, process_info(Pid, status)} of
+                      {DPrt, {status, suspended}} when is_port(DPrt) -> true;
+                      {DPid, {status, waiting}} when is_pid(DPid) -> true;
                       _ -> false
                   end
           end),
@@ -1703,37 +1705,38 @@ bad_dist_ext_check_msgs([M|Ms]) ->
             bad_dist_ext_check_msgs(Ms)
     end.
 
+ensure_dctrl(Node) ->
+    case dctrl(Node) of
+        undefined ->
+            pong = net_adm:ping(Node),
+            dctrl(Node);
+        DCtrl ->
+            DCtrl
+    end.
 
-dport_reg_send(Node, Name, Msg) ->
-    DPrt = case dport(Node) of
-               undefined ->
-                   pong = net_adm:ping(Node),
-                   dport(Node);
-               Prt ->
-                   Prt
-           end,
-    port_command(DPrt, [dmsg_hdr(),
-                        dmsg_ext({?DOP_REG_SEND,
-                                  self(),
-                                  ?COOKIE,
-                                  Name}),
-                        dmsg_ext(Msg)]).
-
-
-dport_send(To, Msg) ->
+dctrl_send(DPrt, Data) when is_port(DPrt) ->
+    port_command(DPrt, Data);
+dctrl_send(DPid, Data) when is_pid(DPid) ->
+    Ref = make_ref(),
+    DPid ! {send, self(), Ref, Data},
+    receive {Ref, Res} -> Res end.
+
+dctrl_dop_reg_send(Node, Name, Msg) ->
+    dctrl_send(ensure_dctrl(Node),
+               [dmsg_hdr(),
+                dmsg_ext({?DOP_REG_SEND,
+                          self(),
+                          ?COOKIE,
+                          Name}),
+                dmsg_ext(Msg)]).
+
+dctrl_dop_send(To, Msg) ->
     Node = node(To),
-    DPrt = case dport(Node) of
-               undefined ->
-                   pong = net_adm:ping(Node),
-                   dport(Node);
-               Prt ->
-                   Prt
-           end,
-    port_command(DPrt, [dmsg_hdr(),
-                        dmsg_ext({?DOP_SEND,
-                                  ?COOKIE,
-                                  To}),
-                        dmsg_ext(Msg)]).
+    dctrl_send(ensure_dctrl(Node),
+               [dmsg_hdr(),
+                dmsg_ext({?DOP_SEND, ?COOKIE, To}),
+                dmsg_ext(Msg)]).
+
 send_bad_structure(Offender,Victim,Bad,WhereToPutSelf) ->
     send_bad_structure(Offender,Victim,Bad,WhereToPutSelf,[]).
 send_bad_structure(Offender,Victim,Bad,WhereToPutSelf,PayLoad) ->
@@ -1743,7 +1746,7 @@ send_bad_structure(Offender,Victim,Bad,WhereToPutSelf,PayLoad) ->
           fun () ->
                   Node = node(Victim),
                   pong = net_adm:ping(Node),
-                  DPrt = dport(Node),
+                  DCtrl = dctrl(Node),
                   Bad1 = case WhereToPutSelf of
                              0 ->
                                  Bad;
@@ -1756,7 +1759,7 @@ send_bad_structure(Offender,Victim,Bad,WhereToPutSelf,PayLoad) ->
                       [] -> [];
                       _Other -> [dmsg_ext(PayLoad)]
                   end,
-                  port_command(DPrt, DData),
+                  dctrl_send(DCtrl, DData),
                   Parent ! {DData,Done}
           end),
     receive
@@ -1784,11 +1787,11 @@ send_bad_msgs(BadNode, To, Repeat) when is_atom(BadNode),
                fun () ->
                        Node = node(To),
                        pong = net_adm:ping(Node),
-                       DPrt = dport(Node),
+                       DCtrl = dctrl(Node),
                        DData = [dmsg_hdr(),
                                 dmsg_ext({?DOP_SEND, ?COOKIE, To}),
                                 dmsg_bad_atom_cache_ref()],
-                       repeat(fun () -> port_command(DPrt, DData) end, Repeat),
+		       repeat(fun () -> dctrl_send(DCtrl, DData) end, Repeat),
                        Parent ! Done
                end),
     receive Done -> ok end.
@@ -1810,11 +1813,12 @@ send_bad_ctl(BadNode, ToNode) when is_atom(BadNode), is_atom(ToNode) ->
                                        replace}),
                        CtlBeginSize = size(Ctl) - size(Replace),
                        <<CtlBegin:CtlBeginSize/binary, Replace/binary>> = Ctl,
-                       port_command(dport(ToNode),
-                                    [dmsg_fake_hdr2(),
-                                     CtlBegin,
-                                     dmsg_bad_atom_cache_ref(),
-                                     dmsg_ext({a, message})]),
+                       DCtrl = dctrl(ToNode),
+                       Data = [dmsg_fake_hdr2(),
+                               CtlBegin,
+                               dmsg_bad_atom_cache_ref(),
+                               dmsg_ext({a, message})],
+                       dctrl_send(DCtrl, Data),
                        Parent ! Done
                end),
     receive Done -> ok end.
@@ -1827,17 +1831,17 @@ send_bad_dhdr(BadNode, ToNode) when is_atom(BadNode), is_atom(ToNode) ->
     spawn_link(BadNode,
                fun () ->
                        pong = net_adm:ping(ToNode),
-                       port_command(dport(ToNode), dmsg_bad_hdr()),
+                       dctrl_send(dctrl(ToNode), dmsg_bad_hdr()),
                        Parent ! Done
                end),
     receive Done -> ok end.
 
-dport(Node) when is_atom(Node) ->
+dctrl(Node) when is_atom(Node) ->
     case catch erts_debug:get_internal_state(available_internal_state) of
         true -> true;
         _ -> erts_debug:set_internal_state(available_internal_state, true)
     end,
-    erts_debug:get_internal_state({dist_port, Node}).
+    erts_debug:get_internal_state({dist_ctrl, Node}).
 
 dmsg_hdr() ->
     [131, % Version Magic
@@ -1979,7 +1983,7 @@ freeze_node(Node, MS) ->
                fun () ->
                        erts_debug:set_internal_state(available_internal_state,
                                                      true),
-                       dport_send(Freezer, DoingIt),
+                       dctrl_dop_send(Freezer, DoingIt),
                        receive after Own -> ok end,
                        erts_debug:set_internal_state(block, MS+Own)
                end),
diff --git a/erts/emulator/test/erl_link_SUITE.erl b/erts/emulator/test/erl_link_SUITE.erl
index 5622cce980..d8c5b663e3 100644
--- a/erts/emulator/test/erl_link_SUITE.erl
+++ b/erts/emulator/test/erl_link_SUITE.erl
@@ -533,7 +533,7 @@ freeze_node(Node, MS) ->
                fun () ->
                        erts_debug:set_internal_state(available_internal_state,
                                                      true),
-                       dport_send(Freezer, DoingIt),
+                       dctrl_dop_send(Freezer, DoingIt),
                        receive after Own -> ok end,
                        erts_debug:set_internal_state(block, MS+Own)
                end),
@@ -544,20 +544,22 @@ make_busy(Node, Time) when is_integer(Time) ->
     Own = 500,
     freeze_node(Node, Time+Own), 
     Data = busy_data(),
+    DCtrl = dctrl(Node),
     %% first make port busy
     Pid = spawn_link(fun () ->
                              forever(fun () ->
-                                             dport_reg_send(Node,
-                                                            '__noone__',
-                                                            Data)
+                                             dctrl_dop_reg_send(Node,
+                                                                '__noone__',
+                                                                Data)
                                      end)
                      end),
     receive after Own -> ok end,
     wait_until(fun () ->
-                       case process_info(Pid, status) of
-                           {status, suspended} -> true;
-                           _ -> false
-                       end
+                  case {DCtrl, process_info(Pid, status)} of
+                      {DPrt, {status, suspended}} when is_port(DPrt) -> true;
+                      {DPid, {status, waiting}} when is_pid(DPid) -> true;
+                      _ -> false
+                  end
                end),
     %% then dist entry
     make_busy(Node, [nosuspend], Data),
@@ -1048,42 +1050,45 @@ stop_node(Node) ->
 -define(DOP_DEMONITOR_P,	20).
 -define(DOP_MONITOR_P_EXIT,	21).
 
-dport_send(To, Msg) ->
-    Node = node(To),
-    DPrt = case dport(Node) of
-               undefined ->
-                   pong = net_adm:ping(Node),
-                   dport(Node);
-               Prt ->
-                   Prt
-           end,
-    port_command(DPrt, [dmsg_hdr(),
-                        dmsg_ext({?DOP_SEND,
-                                  ?COOKIE,
-                                  To}),
-                        dmsg_ext(Msg)]).
-
-dport_reg_send(Node, Name, Msg) ->
-    DPrt = case dport(Node) of
-               undefined ->
-                   pong = net_adm:ping(Node),
-                   dport(Node);
-               Prt ->
-                   Prt
-           end,
-    port_command(DPrt, [dmsg_hdr(),
-                        dmsg_ext({?DOP_REG_SEND,
-                                  self(),
-                                  ?COOKIE,
-                                  Name}),
-                        dmsg_ext(Msg)]).
-
-dport(Node) when is_atom(Node) ->
+ensure_dctrl(Node) ->
+    case dctrl(Node) of
+        undefined ->
+            pong = net_adm:ping(Node),
+            dctrl(Node);
+        DCtrl ->
+            DCtrl
+    end.
+
+dctrl_send(DPrt, Data) when is_port(DPrt) ->
+    port_command(DPrt, Data);
+dctrl_send(DPid, Data) when is_pid(DPid) ->
+    Ref = make_ref(),
+    DPid ! {send, self(), Ref, Data},
+    receive {Ref, Res} -> Res end.
+
+dctrl_dop_send(To, Msg) ->
+    dctrl_send(ensure_dctrl(node(To)),
+               [dmsg_hdr(),
+                dmsg_ext({?DOP_SEND,
+                          ?COOKIE,
+                          To}),
+                dmsg_ext(Msg)]).
+
+dctrl_dop_reg_send(Node, Name, Msg) ->
+    dctrl_send(ensure_dctrl(Node),
+               [dmsg_hdr(),
+                dmsg_ext({?DOP_REG_SEND,
+                          self(),
+                          ?COOKIE,
+                          Name}),
+                dmsg_ext(Msg)]).
+
+dctrl(Node) when is_atom(Node) ->
     case catch erts_debug:get_internal_state(available_internal_state) of
         true -> true;
         _ -> erts_debug:set_internal_state(available_internal_state, true)
     end,
-    erts_debug:get_internal_state({dist_port, Node}).
+    erts_debug:get_internal_state({dist_ctrl, Node}).
 
 dmsg_hdr() ->
     [131, % Version Magic
diff --git a/erts/emulator/test/node_container_SUITE.erl b/erts/emulator/test/node_container_SUITE.erl
index 8e9e3cb05a..be90f929df 100644
--- a/erts/emulator/test/node_container_SUITE.erl
+++ b/erts/emulator/test/node_container_SUITE.erl
@@ -405,6 +405,7 @@ node_table_gc(Config) when is_list(Config) ->
     PreKnown = nodes(known),
     io:format("PreKnown = ~p~n", [PreKnown]),
     make_node_garbage(0, 200000, 1000, []),
+    receive after 1000 -> ok end, %% Wait for thread progress...
     PostKnown = nodes(known),
     PostAreas = erlang:system_info(allocated_areas),
     io:format("PostKnown = ~p~n", [PostKnown]),
diff --git a/erts/preloaded/ebin/erlang.beam b/erts/preloaded/ebin/erlang.beam
index 58c17dc416..81527dc164 100644
--- a/erts/preloaded/ebin/erlang.beam
+++ b/erts/preloaded/ebin/erlang.beam
diff --git a/erts/preloaded/ebin/erts_internal.beam b/erts/preloaded/ebin/erts_internal.beam
index 6691749dcb..5416826f19 100644
--- a/erts/preloaded/ebin/erts_internal.beam
+++ b/erts/preloaded/ebin/erts_internal.beam
diff --git a/erts/preloaded/src/erlang.erl b/erts/preloaded/src/erlang.erl
index 72dd804412..4315b53358 100644
--- a/erts/preloaded/src/erlang.erl
+++ b/erts/preloaded/src/erlang.erl
@@ -48,6 +48,12 @@
 	 await_sched_wall_time_modifications/2,
 	 gather_gc_info_result/1]).
 
+-export([dist_ctrl_input_handler/2,
+         dist_ctrl_put_data/2,
+         dist_ctrl_get_data/1,
+         dist_ctrl_get_data_notification/1,
+         dist_get_stat/1]).
+
 -deprecated([now/0]).
 
 %% Get rid of autoimports of spawn to avoid clashes with ourselves.
@@ -87,6 +93,10 @@
 
 -export_type([prepared_code/0]).
 
+-opaque dist_handle() :: atom().
+
+-export_type([dist_handle/0]).
+
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %% Native code BIF stubs and their types
 %% (BIF's actually implemented in this module goes last in the file)
@@ -1641,7 +1651,7 @@ setnode(_P1, _P2) ->
     erlang:nif_error(undefined).
 
 %% setnode/3
--spec erlang:setnode(P1, P2, P3) -> true when
+-spec erlang:setnode(P1, P2, P3) -> dist_handle() when
       P1 :: atom(),
       P2 :: port(),
       P3 :: {term(), term(), term(), term()}.
@@ -3204,6 +3214,47 @@ port_get_data(_Port) ->
     erlang:nif_error(undefined).
 
 %%
+%% Distribution channel management
+%%
+
+-spec erlang:dist_ctrl_input_handler(DHandle, InputHandler) -> 'ok' when
+      DHandle :: dist_handle(),
+      InputHandler :: pid().
+
+dist_ctrl_input_handler(_DHandle, _InputHandler) ->
+    erlang:nif_error(undefined).
+
+-spec erlang:dist_ctrl_put_data(DHandle, Data) -> 'ok' when
+      DHandle :: dist_handle(),
+      Data :: iodata().
+
+dist_ctrl_put_data(_DHandle, _Data) ->
+    erlang:nif_error(undefined).
+
+-spec erlang:dist_ctrl_get_data(DHandle) -> Data | 'none' when
+      DHandle :: dist_handle(),
+      Data :: iodata().
+
+dist_ctrl_get_data(_DHandle) ->
+    erlang:nif_error(undefined).
+
+-spec erlang:dist_ctrl_get_data_notification(DHandle) -> 'ok' when
+      DHandle :: dist_handle().
+
+dist_ctrl_get_data_notification(_DHandle) ->
+    erlang:nif_error(undefined).
+
+-spec erlang:dist_get_stat(DHandle) -> Res when
+      DHandle :: dist_handle(),
+      InputPackets :: non_neg_integer(),
+      OutputPackets :: non_neg_integer(),
+      PendingOutputPackets :: boolean(),
+      Res :: {'ok', InputPackets, OutputPackets, PendingOutputPackets}.
+
+dist_get_stat(_DHandle) ->
+    erlang:nif_error(undefined).
+
+%%
 %% If the emulator wants to perform a distributed command and
 %% a connection is not established to the actual node the following 
 %% functions are called in order to set up the connection and then
diff --git a/erts/preloaded/src/erts_internal.erl b/erts/preloaded/src/erts_internal.erl
index 26fb1458af..bb1824ecd4 100644
--- a/erts/preloaded/src/erts_internal.erl
+++ b/erts/preloaded/src/erts_internal.erl
@@ -61,6 +61,8 @@
 
 -export([trace/3, trace_pattern/3]).
 
+-export([dist_ctrl_put_data/2]).
+
 %% Auto import name clash
 -export([check_process_code/1]).
 
@@ -461,3 +463,38 @@ trace(_PidSpec, _How, _FlagList) ->
       FlagList :: [ ].
 trace_pattern(_MFA, _MatchSpec, _FlagList) ->
     erlang:nif_error(undefined).
+
+-spec dist_ctrl_put_data(DHandle, Data) -> 'ok' when
+      DHandle :: erlang:dist_handle(),
+      Data :: iolist().
+
+dist_ctrl_put_data(DHandle, IoList) ->
+    %%
+    %% Helper for erlang:dist_ctrl_put_data/2
+    %%
+    %% erlang:dist_ctrl_put_data/2 traps to
+    %% this function if second argument is
+    %% a list...
+    %%
+    try
+        Binary = erlang:iolist_to_binary(IoList),
+        %% Restart erlang:dist_ctrl_put_data/2
+        %% with the iolist converted to a binary...
+        erlang:dist_ctrl_put_data(DHandle, Binary)
+    catch
+        Class : Reason ->
+            %% Throw exception as if thrown from
+            %% erlang:dist_ctrl_put_data/2 ...
+            RootST = try erlang:error(Reason)
+                     catch
+                         error:Reason ->
+                             case erlang:get_stacktrace() of
+                                 [] -> [];
+                                 ST -> tl(ST)
+                             end
+                     end,
+	    StackTrace = [{erlang, dist_ctrl_put_data,
+                           [DHandle, IoList], []}
+                          | RootST],
+	    erlang:raise(Class, Reason, StackTrace)
+    end.