Shared: fix shared futures missing wake up #2899
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doesn't look like I can add reviewers or labels, manually tag here @taiki-e , would appreciate feedbacks or loop in proper reviewers, thanks |
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an attempt to fix #2706
the waker mutex is used to protect the state transition that involves wakers (add, wake, re-wake), if a waker is called during the polling, it sets the state to
WOKEN_DURING_POLLINGthen the polling thread re-checks for potential new wakers and set state back to IDLE under the same mutex to avoid the race condition.an unit test is adopted from the issue and added, without the fix, it'll be stuck within 5 loops on my laptop locally.