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Author vstinner
Recipients vstinner
Date 2017-06-21.22:38:43
SpamBayes Score -1.0
Marked as misclassified Yes
Message-id <>
test.test_threading.ConditionTests.test_notify() tests the threading._Condition.

threading._Condition uses internally a threading._RLock.

threading._RLock uses an internal lock created with thread.allocate_lock().

thread.allocate_lock() calls internally PyThread_allocate_lock(). On my Linux (Fedora 25) and FreeBSD (FreeBSD 11 VM) machines, PyThread_allocate_lock() calls sem_init(): POSIX pthread semaphores.

In Python 3, RLock was implemented in C for speed (the new Python 3.0 io module was slow because of RLock performance): see bpo-3001.

I know at least one race condition in Python 2.7 RLock: bpo-13697, RLock bug with signals.
Date User Action Args
2017-06-21 22:38:43vstinnersetrecipients: + vstinner
2017-06-21 22:38:43vstinnersetmessageid: <>
2017-06-21 22:38:43vstinnerlinkissue30727 messages
2017-06-21 22:38:43vstinnercreate