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c++pthreadsmutex
Zach
Zach

Reputation: 537

Does pthread_cond_signal function unlock the mutex the calling thread locked?

When i call 'pthread_cond_signal' during my thread's function, does this call unlock the mutex i currently use? (Not the one the pthread_cond_wait is waiting for).

Upvotes: 3

Views: 1583

Answers (2)

stefaanv
stefaanv

Reputation: 14392

Only the mutex given to pthread_cond_(timed_)wait() is unlocked to give other threads the chance to change the condition. At the end of pthread_cond_wait, the mutex is locked again. No other functions lock/unlock mutexes.

Upvotes: 5

Mark B
Mark B

Reputation: 96233

No, it doesn't unlock any mutex at all. pthread_cond_wait does unlock its mutex, and when it exits the mutex is locked again.

Upvotes: 3

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