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Merge pull request #328 from tailhook/patch-1

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Added refinement for ZMQ_FD option
This commit is contained in:
Ian Barber
2012-04-27 03:04:42 -07:00
parent 29000d3b02 138def0b99
commit 7c5d79ddd3
1 changed files with 6 additions and 0 deletions
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6
doc/zmq_getsockopt.txt
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@@ -355,6 +355,12 @@ necessarily indicate that messages are available to be read from, or can be
written to, the underlying socket; applications must retrieve the actual event
state with a subsequent retrieval of the 'ZMQ_EVENTS' option.
NOTE: The returned file descriptor is also used internally by 'zmq_send' and
'zmq_recv' functions. Given it's edge triggered nature, application must update
state of 'ZMQ_EVENTS' after each invocation of 'zmq_send' or 'zmq_recv'.
To be more explicit: after calling 'zmq_send' socket may become readable (and
vice versa) without triggering read event on file descriptor.
CAUTION: The returned file descriptor is intended for use with a 'poll' or
similar system call only. Applications must never attempt to read or write data
to it directly, neither should they try to close it.