[issue30765] PyThread_acquire_lock can block even when asked not ot

[Antoine Pitrou]

New submission from Antoine Pitrou:

Discovered in issue30703.  When POSIX semaphores are not used for Python locks, pthread_mutex_lock() is called for acquiring a lock even when asked not to block.  This can be disastrous when called from a signal handler.

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components: Interpreter Core
messages: 296886
nosy: haypo, ned.deily, pitrou, ronaldoussoren
priority: normal
severity: normal
stage: needs patch
status: open
title: PyThread_acquire_lock can block even when asked not ot
type: behavior
versions: Python 2.7, Python 3.5, Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30765>
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