[issue35493] multiprocessing.Pool._worker_handler(): use SIGCHLD to be notified on worker exit
STINNER Victor
report at bugs.python.org
Fri Dec 14 06:48:02 EST 2018
STINNER Victor <vstinner at redhat.com> added the comment:
> How do you use SIGCHLD on Windows?
I'm only proposing to use a signal when it's available, on UNIX. So have multiple implementations of the function, depending on the ability to get notified on completion without polling.
On Windows, maybe we could use a dedicated thread to set an event once WaitForSingleObject/WaitForMultipleObjects completes?
The design of my bpo-35479 change is to replace polling with one or multiple events. Maybe we can use an event to wakeup _worker_handler() when something happens, but have different wants to signal this event.
I have to investigate how Process.sentinel can be used here.
I might be interesting to use asyncio internally, but I'm not sure if it's possible ;-)
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