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bpo-40089: Add _at_fork_reinit() method to locks (GH-19195)

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Add a private _at_fork_reinit() method to _thread.Lock,
_thread.RLock, threading.RLock and threading.Condition classes:
reinitialize the lock after fork in the child process; reset the lock
to the unlocked state.

Rename also the private _reset_internal_locks() method of
threading.Event to _at_fork_reinit().

* Add _PyThread_at_fork_reinit() private function. It is excluded
  from the limited C API.
* threading.Thread._reset_internal_locks() now calls
  _at_fork_reinit() on self._tstate_lock rather than creating a new
  Python lock object.
This commit is contained in:
Victor Stinner 2020-04-07 23:11:49 +02:00 • committed by GitHub
parent 48b069a003
commit 87255be696
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7 changed files with 133 additions and 22 deletions
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9
Include/pythread.h
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@ -36,6 +36,15 @@ PyAPI_FUNC(int) PyThread_acquire_lock(PyThread_type_lock, int);
#define WAIT_LOCK 1
#define NOWAIT_LOCK 0
#ifndef Py_LIMITED_API
#ifdef HAVE_FORK
/* Private function to reinitialize a lock at fork in the child process.
Reset the lock to the unlocked state.
Return 0 on success, return -1 on error. */
PyAPI_FUNC(int) _PyThread_at_fork_reinit(PyThread_type_lock *lock);
#endif /* HAVE_FORK */
#endif /* !Py_LIMITED_API */
/* PY_TIMEOUT_T is the integral type used to specify timeouts when waiting
on a lock (see PyThread_acquire_lock_timed() below).
PY_TIMEOUT_MAX is the highest usable value (in microseconds) of that