STINNER Victor <vstin...@redhat.com> added the comment:

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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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue35493>
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