Each car simply counts up and upon reaching 50, increments the counting semaphore (once) too.
每辆车只计数到达50，增量计数信号量(一次)。
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.
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。
But the focus in this paper is the application of counting semaphore in VxWorks, which can be used in the Producer_Consumer problem to solve the data synchronism in multi process communication.
文中重点分析了采用计数器信号量解决多进程同步通信，即生产者—消费者问题。
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