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authorRickard Green <rickard@erlang.org>2012-12-07 00:28:50 +0100
committerRickard Green <rickard@erlang.org>2012-12-07 00:28:50 +0100
commit6027f852217f0014f1892fbbfa45c69e104da652 (patch)
treebdb10abcf579b5607dc287b395fb15fa667b0512 /system/doc/reference_manual
parentd29c460c4ad1ca0cc2fb6a13a81b4ccc07516941 (diff)
parent3f85767e086e08b70baee34d719df9a8bc8814f4 (diff)
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Merge branch 'rickard/port-optimizations/OTP-10336' into rickard/r16/port-optimizations/OTP-10336
* rickard/port-optimizations/OTP-10336: Change annotate level for emacs-22 in cerl Update etp-commands Add documentation on communication in Erlang Add support for busy port message queue Add driver callback epilogue Implement true asynchronous signaling between processes and ports Add erl_drv_[send|output]_term Move busy port flag Use rwlock for driver list Optimize management of port tasks Improve configuration of process and port tables Remove R9 compatibility features Use ptab functionality also for ports Prepare for use of ptab functionality also for ports Atomic port state Generalize process table implementation Implement functionality for delaying thread progress from unmanaged threads Conflicts: erts/doc/src/erl_driver.xml erts/doc/src/erlang.xml erts/emulator/beam/beam_bif_load.c erts/emulator/beam/beam_bp.c erts/emulator/beam/beam_emu.c erts/emulator/beam/bif.c erts/emulator/beam/copy.c erts/emulator/beam/erl_alloc.c erts/emulator/beam/erl_alloc.types erts/emulator/beam/erl_bif_info.c erts/emulator/beam/erl_bif_port.c erts/emulator/beam/erl_bif_trace.c erts/emulator/beam/erl_init.c erts/emulator/beam/erl_message.c erts/emulator/beam/erl_port_task.c erts/emulator/beam/erl_process.c erts/emulator/beam/erl_process.h erts/emulator/beam/erl_process_lock.c erts/emulator/beam/erl_trace.c erts/emulator/beam/export.h erts/emulator/beam/global.h erts/emulator/beam/io.c erts/emulator/sys/unix/sys.c erts/emulator/sys/vxworks/sys.c erts/emulator/test/port_SUITE.erl erts/etc/unix/cerl.src erts/preloaded/ebin/erlang.beam erts/preloaded/ebin/prim_inet.beam erts/preloaded/src/prim_inet.erl lib/hipe/cerl/erl_bif_types.erl lib/kernel/doc/src/inet.xml lib/kernel/src/inet.erl
Diffstat (limited to 'system/doc/reference_manual')
-rw-r--r--system/doc/reference_manual/ports.xml13
1 files changed, 9 insertions, 4 deletions
diff --git a/system/doc/reference_manual/ports.xml b/system/doc/reference_manual/ports.xml
index 4847dd67cd..c4e4ef1d35 100644
--- a/system/doc/reference_manual/ports.xml
+++ b/system/doc/reference_manual/ports.xml
@@ -87,8 +87,14 @@
of bytes, the option <c>binary</c> must be included.</p>
<p>The port owner <c>Pid</c> can communicate with the port
<c>Port</c> by sending and receiving messages. (In fact, any
- process can send the messages to the port, but the messages from
- the port always go to the port owner).</p>
+ process can send the messages to the port, but the port owner must
+ be identified in the message).</p>
+ <p>As of OTP-R16 messages sent to ports are delivered truly
+ asynchronously. The underlying implementation previously
+ delivered messages to ports synchronously. Message passing has
+ however always been documented as an asynchronous operation, so
+ this should not be an issue for an Erlang program communicating
+ with ports, unless false assumptions about ports has been made.</p>
<p>Below, <c>Data</c> must be an I/O list. An I/O list is a binary
or a (possibly deep) list of binaries or integers in the range
0..255.</p>
@@ -127,8 +133,7 @@
<tcaption>Messages Received From a Port.</tcaption>
</table>
<p>Instead of sending and receiving messages, there are also a
- number of BIFs that can be used. These can be called by any
- process, not only the port owner.</p>
+ number of BIFs that can be used.</p>
<table>
<row>
<cell align="left" valign="middle"><c>port_command(Port,Data)</c></cell>