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adding handling EINTR to poll to make it more robust

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some system call and signal will interrupt poll,
making event loop stops and fails to react events and keepalive message
from libvirt.
adding handling EINTR to poll to make it more robust

Signed-off-by: Royce Lv <lvroyce@linux.vnet.ibm.com>
(cherry picked from commit 5e62ba3428b377d47f5ddbee705ee33027354824)
This commit is contained in:
Royce Lv 2012-07-19 09:49:41 +08:00 committed by Cole Robinson
parent d13b354bf0
commit 9a7bbc246b
1 changed files with 44 additions and 39 deletions
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7
examples/domain-events/events-python/event-test.py
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@ -178,6 +178,7 @@ class virEventLoopPure:
def run_once(self): def run_once(self):
sleep = -1 sleep = -1
self.runningPoll = True self.runningPoll = True
try:
next = self.next_timeout() next = self.next_timeout()
debug("Next timeout due at %d" % next) debug("Next timeout due at %d" % next)
if next > 0: if next > 0:
@ -212,13 +213,17 @@ class virEventLoopPure:
continue continue
want = t.get_last_fired() + interval want = t.get_last_fired() + interval
# Deduct 20ms, since schedular timeslice # Deduct 20ms, since scheduler timeslice
# means we could be ever so slightly early # means we could be ever so slightly early
if now >= (want-20): if now >= (want-20):
debug("Dispatch timer %d now %s want %s" % (t.get_id(), str(now), str(want))) debug("Dispatch timer %d now %s want %s" % (t.get_id(), str(now), str(want)))
t.set_last_fired(now) t.set_last_fired(now)
t.dispatch() t.dispatch()
except (os.error, select.error), e:
if e.args[0] != errno.EINTR:
raise
finally:
self.runningPoll = False self.runningPoll = False