I'm using a polling loop in a thread that looks approximately like this
while 1:
p = find_a_process()
rc = p.poll()
if rc is not None:
out, err = p.communicate()
#deal with output etc
sleep(1)
the process p is opened using
p = Popen(cmd, stdin=PIPE, stdout=PIPE, stderr=PIPE, cwd=cwd)
stdin is actually never written to.
I notice that under both win32 and freebsd that things are fine provided
that the subprocess doesn't write too much to stdout/stderr. However,
the subprocess seems to lock often if too much is written (under freebsd
I see a process state of POLL). I assume that the subprocess is filling
up the pipe and then failing to wake up again. I had expected that
subprocess would take care of this for me, but possibly I'm being
utterly clueless and stupid. What should I do to avoid blocking in the
subprocess?
--
Robin Becker
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