Hi,
I'm developing an application that need (as always) interchange data between a
realtime part and non-realtime.
Looking on the documentation and surfing on the web I have found interesting
for my app the examples of xddp protocol. Some time ago, there was an
interesting mail about it [1].
There, the original author ask one thing that I would like to be sure that I
understood. On the examples, the realtime thread uses the function recvfrom()
to receive data from the non-rt thread.
In the mail, the original author asked about make recvfrom
call non-blocking in xddp context, and *Philippe Gerum* answered that
MSG_DONTWAIT should be set in flags.
So, my question is that using that flag, some code like this:
/* Read back packets echoed by the regular thread */
ret = recvfrom(s, buf, sizeof(buf), 0, NULL, 0);
if(ret <= 0)
fail("recvfrom");
recvfrom will not be blocked, but it will return 0?
May I understood that if there's data on the sockect recvfrom will
return something and if no, it would not be blocked and return something?
Thanks in advance,
Leopold
[1] http://www.xenomai.org/pipermail/xenomai/2010-February/019364.html
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A: Because it messes up the order in which people normally read text.
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