Geoffrey McRae bfb47a0ae4 [common] windows: update event fast path to use atomics
Due to a failure to understand atomics when this code was originally
written it has a critical flaw with the fast path where an event could
be signalled when it should not be. This change set corrects this issue
by using atomic operations.
2021-07-09 04:50:14 +10:00
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