how do I listen on a socket without sucking up all the CPU time?

[Alex]

> I've got a worker thread which listens on an ICMP (ping) socket for
> replies to pings that I send out (on the same socket from a different
> thread).  All of this code runs fine, but the socket is set to be
> non-blocking, so recvfrom() returns immediately most of the time, and
> this thread runs like mad, consuming all the available CPU time.  It
> is definitely this thread -- when I don't create this particular
> thread, CPU usage drops back to normal.

This sounds like a job for the select module.

Alex.

-- 
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