PTHREAD_MUTEX_UNLOCK(3P)             BSD              PTHREAD_MUTEX_UNLOCK(3P)



NAME
     pthread_mutex_unlock - Unlocks a mutex

SYNOPSIS
     #include <pthread.h>

     int pthread_mutex_unlock (mutex)
     pthread_mutex_t *mutex;

DESCRIPTION
     The pthread_mutex_unlock function unlocks the specified mutex.  When the
     mutex is unlocked, if more than one thread is waiting for the mutex, the
     next thread to lock the mutex is determined by the scheduler.

     The mutex argument specifies the ID of the mutex to unlock.

NOTES
     This interface is based on draft 4 of the IEEE P1003.4a standard, and
     will be changed to conform to the final version.

DIAGNOSTICS
     Upon successful completion, a value of 0 (zero) is returned.  Otherwise,
     no mutex is created, -1 is returned, and errno is set to indicate the
     error.

ERRORS
     If the pthread_mutex_unlock function fails, errno may be set the the
     following value:

     [EINVAL]  The value specified by the mutex argument is invalid.

     [EPERM]   The mutex is not locked by the calling thread.

SEE ALSO
     pthread_mutex_init(3P), pthread_mutex_destroy(3P), pthread_mutex_lock(3P)