[issue21895] signal.pause() doesn't wake up on SIGCHLD in non-main thread

Bohuslav "Slavek" Kabrda added the comment: I think that the problem here is that the documentation sets an expectation that's not met, at least from my POV. Running the reproducer, I was expecting the main thread to unpause and execute the signal handler (citing: "Python signal handlers are a

[issue21895] signal.pause() doesn't wake up on SIGCHLD in non-main thread

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[issue21895] signal.pause() doesn't wake up on SIGCHLD in non-main thread

STINNER Victor added the comment: First of all, signals and threads usually don't play together. Most signal functions are *not* thread safe. The behaviour of signal functions are not well defined for threads. Example with pause: "pause() causes the calling process (or thread) to sleep

[issue21895] signal.pause() doesn't wake up on SIGCHLD in non-main thread

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[issue21895] signal.pause() doesn't wake up on SIGCHLD in non-main thread

New submission from Bohuslav "Slavek" Kabrda: Reproducer attached. To describe the problem in words, one needs to do this to reproduce this issue: - Create a signal handler and register it using signal.signal to SIGCHLD. - Create a thread that invokes a subprocess, e.g. "sleep 1" and then contin