Single-valued semaphore can only be one thread access, and multi-valued semaphore can be a number of threads available.
单值信号量只能被一个线程获得，而多值信号量可以被若干个线程获得。
Single-valued semaphore can only be one thread access, and multi-valued semaphore can be a number of threads available.
单值信号量只能被一个线程获得，而多值信号量可以被若干个线程获得。
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