8000 gh-110205: Fix asyncio ThreadedChildWatcher._join_threads() by gvanrossum · Pull Request #110884 · python/cpython · GitHub
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gh-110205: Fix asyncio ThreadedChildWatcher._join_threads() #110884

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Merged
merged 12 commits into from
Oct 27, 2023
Merged

gh-110205: Fix asyncio ThreadedChildWatcher._join_threads() #110884

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d414ed2
gh-110205: Fix asyncio ThreadedChildWatcher._join_threads()
vstinner Oct 13, 2023
f161daa
Don't create a new list
vstinner Oct 13, 2023
dbbad2d
Fix typo: self.threads => self._threads
vstinner Oct 13, 2023
85b79b2
Fix code to clear references to terminated threads
gvanrossum Oct 14, 2023
0d802c2
Merge remote-tracking branch 'upstream/main' into asyncio_clear_watch…
gvanrossum Oct 14, 2023
a8ffeee
Make close_loop an instance method so it can call self.fail()
gvanrossum Oct 14, 2023
bda45c8
Filter out dead or daemon threads
gvanrossum Oct 14, 2023
566fb52
Back to basics
gvanrossum Oct 15, 2023
f8090c1
Delete stray code
gvanrossum Oct 15, 2023
aed1a89
Add a comment
gvanrossum Oct 15, 2023
2c1974e
Merge branch 'main' into asyncio_clear_watcher_threads
gvanrossum Oct 26, 2023
50cab38
Raise error if watcher thread won't die
gvanrossum Oct 26, 2023
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gh-110205: Fix asyncio ThreadedChildWatcher._join_threads() 
ThreadedChildWatcher._join_threads() now clears references to
completed threads.

test_asyncio.utils.TestCase now calls _join_threads() of the watcher,
uses SHORT_TIMEOUT to join a thread, and then raises an exception if
there are still running threads.

Rename also ThreadedChildWatcher threads to add "asyncio-" prefix to
the name.
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@vstinner
vstinner committed Oct 13, 2023
commit d414ed266bfc747d03ea9044ea0f662e2b388f1c
10 changes: 7 additions & 3 deletions Lib/asyncio/unix_events.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1373,12 +1373,16 @@ def is_active(self):
def close(self):
self._join_threads()

def _join_threads(self):
def _join_threads(self, timeout=None):
"""Internal: Join all non-daemon threads"""
threads = [thread for thread in list(self._threads.values())
if thread.is_alive() and not thread.daemon]
for thread in threads:
thread.join()
thread.join(timeout)

# Clear references to terminated threads
self.threads = [thread for thread in list(self._threads.values())
if thread.is_alive() and not thread.daemon]

def __enter__(self):
return self
Expand All @@ -1397,7 +1401,7 @@ def __del__(self, _warn=warnings.warn):
def add_child_handler(self, pid, callback, *args):
loop = events.get_running_loop()
thread = threading.Thread(target=self._do_waitpid,
name=f"waitpid-{next(self._pid_counter)}",
name=f"asyncio-waitpid-{next(self._pid_counter)}",
args=(loop, pid, callback, args),
daemon=True)
self._threads[pid] = thread
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9 changes: 6 additions & 3 deletions Lib/test/test_asyncio/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -546,6 +546,7 @@ def close_loop(loop):
else:
loop._default_executor.shutdown(wait=True)
loop.close()

policy = support.maybe_get_event_loop_policy()
if policy is not None:
try:
Expand All @@ -557,9 +558,11 @@ def close_loop(loop):
pass
else:
if isinstance(watcher, asyncio.ThreadedChildWatcher):
threads = list(watcher._threads.values())
for thread in threads:
thread.join()
watcher._join_threads(timeout=support.SHORT_TIMEOUT)
threads = watcher._threads
if threads:
self.fail(f"watcher still has running threads: "
f"{threads}")

def set_event_loop(self, loop, *, cleanup=True):
if loop is None:
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0