计数信号量（Counting Semaphores） 计数信号量是任务同步和互斥的另一种实现方式.计数信号量除了保留信号量被释放的次数以外和二进制信号量是一样的。
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每辆车只计数到达50，增量计数信号量(一次)。
Each car simply counts up and upon reaching 50, increments the counting semaphore (once) too.
希望看到这里，你应该对二进制信号量，计数信号量和互斥锁的区别有了清晰的认识。
Hopefully you should now be clear about the core differences between the Binary Semaphore, General (counting) Semaphore and the Mutex.
在第一部分中，我们回顾了二值信号量与计数信号量的历史，并且讨论了信号量的几个问题。
In Part 1 of this series we looked at the history of the binary and counting semaphore, and then went on to discuss some of the associated problem areas.
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