如果进行调用的线程并不拥有那个互斥对象，则这个调用可能会失败。

This call might fail if the calling thread does not own the mutex object.

youdao

并且绝对不要对您未保持锁的互斥对象进行解锁操作(否则，pthread _ mutex_unlock调用将失败并带一个非零的eperm返回值)。

And you should never unlock a mutex that you don't hold a lock for (otherwise, the pthread_mutex_unlock call will fail with a non-zero EPERM return value).

youdao

如果调用线程并不拥有这个互斥信号量，那么这个函数的执行将会失败。

If the calling thread has no ownership of this mutex, this function fails.

youdao