[contrib/pzstd] Prevent hangs when there are errors #4080
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When two threads are using a WorkQueue and the reader thread exits due to an error, it must call WorkQueue::finish() to wake up the writer thread. Otherwise, if the queue is full and the writer thread is waiting for a free slot, it could hang forever. This can happen in pratice when decompressing a large, corrupted file that does not contain pzstd skippable frames.
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When two threads are using a WorkQueue and the reader thread exits due to an error, it must call WorkQueue::finish() to wake up the writer thread. Otherwise, if the queue is full and the writer thread is waiting for a free slot, it could hang forever.
This can happen in pratice when decompressing a large, corrupted file that does not contain pzstd skippable frames.