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Unix 轮流使用信号灯_Unix_Process_Semaphore - Fatal编程技术网
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Unix 轮流使用信号灯

unix process

Unix 轮流使用信号灯,unix,process,semaphore,Unix,Process,Semaphore,这可能是一个微不足道的问题，但我找不到任何明确的答案。如何仅使用信号量使两个进程轮流进行？我不想使用睡眠或其他IPC。结果应该是： Process 1 did something Process 2 did something Process 1 did something Process 2 did something Process 1 did something Process 2 did something Process 1 did something Process 2 did so

这可能是一个微不足道的问题，但我找不到任何明确的答案。如何仅使用信号量使两个进程轮流进行？我不想使用睡眠或其他IPC。结果应该是：

Process 1 did something
Process 2 did something
Process 1 did something
Process 2 did something
Process 1 did something
Process 2 did something
Process 1 did something
Process 2 did something
您需要两个信号量，每个进程一个，比如S1和S2。过程P1和P2之间的相互作用顺序如下：

  • P1在S1上等待，P2在S2上等待
  • 假设一开始S1是打开的，S2是关闭的
  • P1执行其工作-关闭S1、打开S2并等待S1
  • P2执行其工作-关闭S2、打开S1并等待S2
  • 从3点开始