WorkerThreadPool: Handle exit signal in the tentative scheduling done during waits
#76999
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The semaphore can be posted for two reasons: a new task is available for processing or
exit_threadshas been set totrue.The main thread function handles both cases, whereas the edited one didn't, always assuming the former cause. The problem with that is that it may end up trying to take a task from an empty list, leading to crashes or weird bugs.