NAME

pthread_unlock_global_np - Unlocks a global mutex

SYNOPSIS

#include <pthread.h> void pthread_unlock_global_np();

DESCRIPTION

The pthread_unlock_global_np() routine unlocks the global mutex when each call to pthread_lock_global_np() is matched by a call to this routine. For example, if you called pthread_lock_global_np() three times, pthread_unlock_global_np() unlocks the global mutex when you call it the third time. If no threads are waiting for the global mutex, it becomes unlocked with no current owner. If one or more threads are waiting to lock the global mutex, one thread returns from its call to pthread_lock_global_np(). The scheduling policy is used to determine which thread acquires the global mutex. For the policies SCHED_FIFO and SCHED_RR, a blocked thread is chosen in priority order. The results of calling this routine are unpredictable if the global mutex is already unlocked. The results of calling this routine are also unpredictable if the global mutex is owned by a thread other than the calling thread. This routine is a new primitive.

RETURN VALUES

No value is returned. 

RELATED INFORMATION

Functions:  pthread_lock_global_np(3), pthread_mutexattr_setkind_np(3), pthread_mutex_lock(3), pthread_mutex_unlock(3). 

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