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make BlockingPortal.stop sync #334

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@graingert graingert force-pushed the make-blocking-portal-stop-sync branch from d77d139 to e0ff495 Compare July 3, 2021 22:55
@graingert graingert force-pushed the make-blocking-portal-stop-sync branch from e0ff495 to 2adff23 Compare July 3, 2021 23:11
@graingert graingert requested a review from agronholm July 3, 2021 23:12
@graingert graingert marked this pull request as ready for review July 3, 2021 23:12
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If this method is made synchronous, we need to ensure that people dont try to use it from external threads. At the very least, a warning against that should be added to the docstring. The event.set() call should raise a clear enough error but I feel that the event loop thread id member set should be moved to after the event set, to be safe.

Comment on lines 158 to 159
self._stop_event.set()
self._event_loop_thread_id = None
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@agronholm agronholm Jul 5, 2021

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This should avoid breakage when called from external threads.

Suggested change
self._stop_event.set()
self._event_loop_thread_id = None
if self._event_loop_thread_id is None:
return
if threading.get_ident() != self._event_loop_thread_id:
raise RuntimeError('This method must be called from the event loop thread')
self._event_loop_thread_id = None
self._stop_event.set()

Co-authored-by: Alex Grönholm <alex.gronholm@nextday.fi>
@@ -154,11 +155,18 @@ async def stop(self, cancel_remaining: bool = False) -> None:
finish before returning

"""
if self._event_loop_thread_id is None:
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ah this is wrong - we need to handle cancel_remaining

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