查找在POSIX信号量上阻塞的任务数 [英] Find number of tasks blocking on a POSIX semaphore

问题描述

是否可以通过某种方式知道在特定信号量上等待的进程或线程的数量? 就像一个API来检查值. Sem_getvalue()仅返回0，而不是一个负数，其绝对值是某些站点上提到的信号量上阻止的任务数.

Is there any way by which I can know the number of processes or threads waiting on a particular semaphore? Like a API to check the value. Sem_getvalue() only returns 0 and not a negative number whose absolute value is the number of tasks blocking on the semaphore as mentioned on a few sites.

任何帮助都会很棒.

提前谢谢！

推荐答案

也许您可以在调用 sem_wait 之前减小全局 atomic_t 变量并将其递增遇到信号量的话.

May be you could have taken a global atomic_t variable and incremented it before calling sem_wait and decremented in case you get the semaphore.

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