[issue33608] [subinterpreters] Add a cross-interpreter-safe mechanism to indicate that an object may be destroyed.

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

The commit ef4ac967e2f3a9a18330cc6abe14adb4bc3d0465 introduced a regression in test.test_multiprocessing_spawn.WithThreadsTestManagerRestart.test_rapid_restart: bpo-36114.

Would it be possible to revert it until the bug is properly understood and fixed?

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<https://bugs.python.org/issue33608>
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