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pthread_unlock_global_np(3)
NAME
  pthread_unlock_global_np - Unlocks the DECthreads global mutex.

LIBRARY
  DECthreads POSIX 1003.1c Library (libpthread.so)

SYNOPSIS
  #include <pthread.h>

  int	pthread_unlock_global_np(void);

STANDARDS
  None

PARAMETERS
  None

DESCRIPTION
  This routine unlocks the DECthreads global mutex.  Because the global mutex
  is recursive, the unlock occurs when each call to pthread_lock_global_np(3)
  has been matched by a call to this routine.  For example, if you called
  pthread_lock_global_np(3) three times, pthread_unlock_global_np(3) unlocks
  the global mutex when you call it the third time.

  If no threads are waiting for the DECthreads 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 global 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 (FIFO) 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:

  0	    Successful completion.

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

ERRORS
  None



RELATED INFORMATION
  Functions: pthread_lock_global_np(3)

  Manuals: Guide to DECthreads and Programmer's Guide