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Commit0473fe7

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gvanrossummiss-islington
authored andcommitted
pythonGH-96827: Don't touch closed loops from executor threads (pythonGH-96837)
* When chaining futures, skip callback if loop closed.* When shutting down an executor, don't wake a closed loop.(cherry picked from commite9d6376)Co-authored-by: Guido van Rossum <guido@python.org>
1 parent6d7dbcc commit0473fe7

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3 files changed

+7
-2
lines changed

3 files changed

+7
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lines changed

‎Lib/asyncio/base_events.py‎

Lines changed: 4 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -573,9 +573,11 @@ async def shutdown_default_executor(self):
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def_do_shutdown(self,future):
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try:
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self._default_executor.shutdown(wait=True)
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self.call_soon_threadsafe(future.set_result,None)
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ifnotself.is_closed():
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self.call_soon_threadsafe(future.set_result,None)
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exceptExceptionasex:
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self.call_soon_threadsafe(future.set_exception,ex)
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ifnotself.is_closed():
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self.call_soon_threadsafe(future.set_exception,ex)
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def_check_running(self):
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ifself.is_running():

‎Lib/asyncio/futures.py‎

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -396,6 +396,8 @@ def _call_set_state(source):
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ifdest_loopisNoneordest_loopissource_loop:
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_set_state(destination,source)
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else:
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ifdest_loop.is_closed():
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return
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dest_loop.call_soon_threadsafe(_set_state,destination,source)
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destination.add_done_callback(_call_check_cancel)
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Original file line numberDiff line numberDiff line change
@@ -0,0 +1 @@
1+
Avoid spurious tracebacks from:mod:`asyncio` when default executor cleanup is delayed until after the event loop is closed (e.g. as the result of a keyboard interrupt).

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