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[3.9] bpo-45021: Fix a hang in forked children (GH-28007) (GH-28481)

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_global_shutdown_lock should be reinitialized in forked children
(cherry picked from commit 0bfa1106ac)


Co-authored-by: nullptr <3621629+0x0L@users.noreply.github.com>

Automerge-Triggered-By: GH:gpshead
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Miss Islington (bot) 2021-09-20 11:54:24 -07:00 • committed by GitHub
parent 04dea46dde
commit b06c3b3647
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6
Lib/concurrent/futures/thread.py
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@ -36,6 +36,12 @@ def _python_exit():
# See bpo-39812 for context.
threading._register_atexit(_python_exit)
# At fork, reinitialize the `_global_shutdown_lock` lock in the child process
if hasattr(os, 'register_at_fork'):
os.register_at_fork(before=_global_shutdown_lock.acquire,
after_in_child=_global_shutdown_lock._at_fork_reinit,
after_in_parent=_global_shutdown_lock.release)
class _WorkItem(object):
def __init__(self, future, fn, args, kwargs):