[issue35479] multiprocessing.Pool.join() always takes at least 100 ms

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

My PR 11136 doesn't work: _maintain_pool() should be called frequently to check when a worker completed. Polling worker exit status seems inefficient :-(

asyncio uses SIGCHLD signal to be notified when a child process completes. SafeChildWatcher calls os.waitpid(pid, os.WNOHANG) on each child process, whereas FastChildWatcher() uses os.waitpid(-1, os.WNOHANG).

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