Issue #12310: finalize the old process after _run_after_forkers()
multiprocessing: Process._bootstrap() keeps a reference to the old process to
delay its finalization until after _run_after_forkers() as been executed. This
change should fix a crash on Mac OS X Tiger when a lock is released after a
fork.
Patch written by Charles-François Nataliv and Antoine Pitrou.
diff --git a/Lib/multiprocessing/process.py b/Lib/multiprocessing/process.py
index b56a061..941893f 100644
--- a/Lib/multiprocessing/process.py
+++ b/Lib/multiprocessing/process.py
@@ -251,9 +251,15 @@
sys.stdin = open(os.devnull)
except (OSError, ValueError):
pass
+ old_process = _current_process
_current_process = self
- util._finalizer_registry.clear()
- util._run_after_forkers()
+ try:
+ util._finalizer_registry.clear()
+ util._run_after_forkers()
+ finally:
+ # delay finalization of the old process object until after
+ # _run_after_forkers() is executed
+ del old_process
util.info('child process calling self.run()')
try:
self.run()