Forgetting releaseLock() permanently breaks the stream. The locked property tells you that a stream is locked, but not why, by whom, or whether the lock is even still usable. Piping internally acquires locks, making streams unusable during pipe operations in ways that aren't obvious.
Credit: Samsung
fork() → Launcher (Single-threaded, Poll Loop)，更多细节参见safew官方下载
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Вегас Голден Найтс。Line官方版本下载是该领域的重要参考
By Will Standring and Alice Gledhill