pthread_unlock_global_np

Unlocks a global mutex.

Syntax

pthread_unlock_global_np();

C Binding

#include 


int
pthread_unlock_global_np (void);

Arguments

: None

Description

This routine unlocks the global mutex. Since the global mutex is recursive, the unlock will occur when each call to pthread_lock_ global_np has been 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, this routine causes one thread to unblock and try to acquire the mutex. The scheduling policy is used to determine which thread is awakened. For the policies SCHED_FIFO and SCHED_ RR, a blocked thread is chosen in priority order, using first-in /first-out within priorities.

Return Values

If an error condition occurs, this routine returns an integer value indicating the type of error. Possible return values are as follows:

Return Description

0 Successful completion. [EPERM] The mutex is unlocked or owned by another thread.

Associated Routines

   pthread_lock_global_np