New submission from Petr MOTEJLEK:
Hi,
The documentation for signal.signal() clearly states that it is only supposed
to be called on MainThread
However, it does not say so for the signal.sigwait() and neither
signal.sigtimedwait()
I think this is an error on the documentation side of things (unless I misread
it). When either signal.sigwait or signal.sigtimedwait are called outside
MainThread, they simply never catch any signals (signal.sigwait blocks
indefinitely)
I did not test this on Windows, but on both Linux and OS X the behavior is the
same
Consider the below simple code
import signal
import os
def sigwait():
print("Send me a signal, my PID is {p}".format(p=os.getpid()))
print("Got the signal: {i}".format(i=signal.sigwait((signal.SIGUSR1,))))
If sigwait() is called on MainThread and the process receives SIGUSR1, "Got the
signal: ..." gets printed. However, calling sigwait in a different thread
blocks the thread indefinitely. The behavior is the same with
signal.sigtimedwait() as well
----------
assignee: docs@python
components: Documentation
messages: 286269
nosy: docs@python, [email protected]
priority: normal
severity: normal
status: open
title: Doc bug: signal.sigwait and signal.sigtimedwait do not work outside the
Main thread
type: behavior
versions: Python 3.4, Python 3.5, Python 3.6, Python 3.7
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Python tracker <[email protected]>
<http://bugs.python.org/issue29374>
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