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J. Nick Koston
669a308209
Replace empty() + pop() with pop() directly as the fast-path check: - LockFreeQueue: pop() costs 1 memw (acquire on tail_) vs empty()'s 2 memw (acquire on both head_ and tail_) on Xtensa - FreeRTOSQueue: pop() is 1 critical section vs empty() + pop() = 2 Also move dropped count check after the drain loop since drops can only occur when the queue was full, and only this loop drains it.
