pthread_mutex_unlock Subroutine Purpose Unlocks a mutex. Library Threads Library (libpthreads.a) Syntax #include
int pthread_mutex_unlock (mutex) pthread_mutex_t *mutex; Description The pthread_mutex_unlock subroutine unlocks the mutex mutex. It checks the mutex owner and resets the mutex only if the calling thread is the mutex owner; otherwise it returns an error. Note: The pthread.h header file must be the first included file of each source file using the threads library. Parameter mutex Specifies the target mutex. Return Values Upon successful completion, 0 is returned. Otherwise, an error code is returned. Error Codes The pthread_mutex_unlock subroutine is unsuccessful if the following is true: EINVAL The mutex parameter is not valid. EPERM The calling thread does not own the mutex lock. Implementation Specifics These subroutines are part of the Base Operating System (BOS) Runtime. Related Information The pthread_mutex_lock or pthread_mutex_trylock subroutine. Using Mutexes. Threads Library Quick Reference.