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Issue #11870: threading: Properly reinitialize threads internal locks and

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condition variables to avoid deadlocks in child processes.
This commit is contained in:
Charles-François Natali 2011-12-18 18:45:16 +01:00
parent 3c4dcea712
commit b055bf6acb
2 changed files with 7 additions and 7 deletions
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11
Lib/threading.py
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@ -1047,21 +1047,18 @@ def _after_fork():
current = current_thread()
with _active_limbo_lock:
for thread in _active.values():
# Any lock/condition variable may be currently locked or in an
# invalid state, so we reinitialize them.
thread._reset_internal_locks()
if thread is current:
# There is only one active thread. We reset the ident to
# its new value since it can have changed.
ident = get_ident()
thread._ident = ident
# Any condition variables hanging off of the active thread may
# be in an invalid state, so we reinitialize them.
thread._reset_internal_locks()
new_active[ident] = thread
else:
# All the others are already stopped.
# We don't call _Thread__stop() because it tries to acquire
# thread._Thread__block which could also have been held while
# we forked.
thread._stopped = True
thread._stop()
_limbo.clear()
_active.clear()