fix random hang in non-blocking-queue #61448
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Bug fixes
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Description
fix random hang in non-blocking-queue
First,
num_tasks_will be read/write both in two different threads, which may leads to data inconsistence, though it is atomic.And,
ec_.Notify(false);is able tofast returnwhen no threads are waiting with a little time cost, so removenum_tasks_.Pcard-76459