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authorRickard Green <[email protected]>2012-09-21 15:12:07 +0200
committerRickard Green <[email protected]>2012-12-07 00:24:26 +0100
commit6e01408aba71e26884c5db81b8e4fa89bd803576 (patch)
tree709bc0a2da80ffdc73fb7426a3de80a55774ff58 /system/doc/reference_manual/ports.xml
parent23c6f9e07a3cae7c05e55abd01ff798384241538 (diff)
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Implement true asynchronous signaling between processes and ports
Diffstat (limited to 'system/doc/reference_manual/ports.xml')
-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>