[3.11] gh-102512: Turn _DummyThread into _MainThread after os.fork() called from a foreign thread (GH-113261)#114431
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serhiy-storchaka merged 1 commit intopython:3.11from Jan 22, 2024
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…ork() called from a foreign thread (pythonGH-113261) Always set a _MainThread as a main thread after os.fork() is called from a thread started not by the threading module. A new _MainThread was already set as a new main thread after fork if threading.current_thread() was not called for a foreign thread before fork. Now, if it was called before fork, the implicitly created _DummyThread will be turned into _MainThread after fork. It fixes, in particularly, an incompatibility of _DummyThread with the threading shutdown logic which relies on the main thread having tstate_lock. (cherry picked from commit 49785b0) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> Co-authored-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
This was referenced Jan 22, 2024
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Always set a _MainThread as a main thread after os.fork() is called from a thread started not by the threading module.
A new _MainThread was already set as a new main thread after fork if threading.current_thread() was not called for a foreign thread before fork. Now, if it was called before fork, the implicitly created _DummyThread will be turned into _MainThread after fork.
It fixes, in particularly, an incompatibility of _DummyThread with the threading shutdown logic which relies on the main thread having tstate_lock.
(cherry picked from commit 49785b0)
os.fork()called from DummyThread confuses threading shutdown logic #102512