pthread_rwlock_rdlock may fail if the maximum number of read locks (implementation defined) for the lock has been exceeded.

如果超过了最大读锁数量（由实现定义），pthread_rwlock_rdlock 可能会失败。

youdao

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).

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)。

youdao

Conversely, if an exclusive lock was able to be acquired, concurrent applications would not be able to access the file and could fail with a lock time-out.

相反地，如果能够获得互斥型锁，那么并发应用程序就无法访问文件，并因为锁超时失败。

youdao

When companies lock down their systems and fail to listen to staff feedback, more often than not the result is that employees take matters into their own hands and find ways getting round their restrictions.

BBC: Hacking work: How to break the rules to work better