[issue20526] python: Modules/gcmodule.c:379: visit_decref: Assertion `((gc)->gc.gc_refs >> (1)) != 0' failed.
STINNER Victor
report at bugs.python.org
Wed Feb 12 01:00:15 CET 2014
STINNER Victor added the comment:
> Are you sure? I didn't see the daemon flag in ThreadPoolExecutor.
Oh you're right, ThreadPoolExecutor does create daemon threads:
class ThreadPoolExecutor(_base.Executor):
...
def _adjust_thread_count(self):
# When the executor gets lost, the weakref callback will wake up
# the worker threads.
def weakref_cb(_, q=self._work_queue):
q.put(None)
# TODO(bquinlan): Should avoid creating new threads if there are more
# idle threads than items in the work queue.
if len(self._threads) < self._max_workers:
t = threading.Thread(target=_worker,
args=(weakref.ref(self, weakref_cb),
self._work_queue))
t.daemon = True <======= HERE
t.start()
self._threads.add(t)
_threads_queues[t] = self._work_queue
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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20526>
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