[hyperactor] relax mailbox flush counters#4259
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This was referenced Jun 16, 2026
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Stack from ghstack (oldest at bottom):
Use relaxed ordering for the mailbox submitted and completed counters because they are monotonic progress markers, not data publication fences. Register the flush waiter before checking the completed counter so
notify_waiters()cannot race between the check and the wait.Differential Revision: D108622921
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