[nanomsg] Survey pattern and polling
- From: Martin Sustrik <sustrik@xxxxxxxxxx>
- To: <nanomsg@xxxxxxxxxxxxx>
- Date: Thu, 14 Feb 2013 12:30:44 +0100
Hi all,
There's an API problem with survey pattern that I am not sure how to
solve and I would appreciate feedback from the community.
SURVEYOR socket works in following way:
1. send survey
2. receive response
3. receive response
4. receive response
etc.
until recv() returns EFSM error
The error means that survey have timed out.
At that point user may opt to start anew and initiate a new survey.
The question is how shoud the timeout be reported when the socket is
polled on? Signalling POLLERR would mean that any subsequent polling on
the socket -- even for POLLOUT would fail (according to POSIX there's no
way to disable reporting POLLERR). Signalling POLLIN is kind of strange
given that subsequent recv() will return EFSM error.
Ideas anyone?
Martin
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