tree e3a0dccafdd64288e4ecf03cef8a84d9a7b854a7
parent 9f7176d360b5898003d5ca78bab1822ad67867c4
author Serhiy Storchaka <storchaka@gmail.com> 1705932882 +0200
committer GitHub <noreply@github.com> 1705932882 +0200
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gh-102512: Turn _DummyThread into _MainThread after os.fork() called from a foreign thread (GH-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.

Co-authored-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>