[issue30975] Multiprocessing: Event.set() blocks indefinitely if a process waiting on it has died.

2017-07-20 Thread Mick Phillips 

New submission from Mick Phillips:

If a process was waiting on an Event but dies for some reason, nothing else can 
set the Event. I think the Event._cond lock can not be acquired. See attached 
for a demonstration.

I see the same behaviour in Python 2.7.5 and Python 3.5.2. Is this expected 
behaviour?

--
components: Windows
files: WaitersSleepers.py
messages: 298713
nosy: Mick Phillips, davin, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: Multiprocessing: Event.set() blocks indefinitely if a process waiting on 
it has died.
type: behavior
versions: Python 2.7, Python 3.5
Added file: http://bugs.python.org/file47025/WaitersSleepers.py

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[issue30975] Multiprocessing: Event.set() blocks indefinitely if a process waiting on it has died.

2017-07-20 Thread Mick Phillips 

Mick Phillips added the comment:

Thanks for confirming. If anyone finds this and is looking for a workaround, 
here's what I'm using:

while not event.is_set()
try:
time.sleep(timeout)
except (KeyboardInterrupt, IOError):
pass

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[issue30976] multiprocessing.Process.is_alive can show True for dead processes

2017-07-20 Thread Mick Phillips 

New submission from Mick Phillips:

multiprocessing.Process.is_alive() returns True for processes that have been 
killed. See attached for example.

Workaround: also test against psutils.pid_exists.

--
components: Windows
files: alive.py
messages: 298724
nosy: davin, mickp, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: multiprocessing.Process.is_alive can show True for dead processes
versions: Python 2.7, Python 3.5
Added file: http://bugs.python.org/file47028/alive.py

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[issue30976] multiprocessing.Process.is_alive can show True for dead processes

2017-07-20 Thread Mick Phillips 

Mick Phillips added the comment:

Yep - apologies, my mistake.

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resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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