osx man page for pthread_rwlock_unlock

PTHREAD_RWLOCK_UNLOCK(3)				   BSD Library Functions Manual 				  PTHREAD_RWLOCK_UNLOCK(3)

NAME
     pthread_rwlock_unlock -- release a read/write lock

SYNOPSIS
     #include <pthread.h>

     int
     pthread_rwlock_unlock(pthread_rwlock_t *rwlock);

DESCRIPTION
     The pthread_rwlock_unlock() function is used to release the read/write lock previously obtained by pthread_rwlock_rdlock(),
     pthread_rwlock_wrlock(), pthread_rwlock_tryrdlock(), or pthread_rwlock_trywrlock().

RETURN VALUES
     If successful, the pthread_rwlock_unlock() function will return zero.  Otherwise, an error number will be returned to indicate the error.

     The results are undefined if rwlock is not held by the calling thread.

SEE ALSO
     pthread_rwlock_rdlock(3), pthread_rwlock_wrlock(3)

STANDARDS
     The pthread_rwlock_unlock() function is expected to conform to Version 2 of the Single UNIX Specification (``SUSv2'').

ERRORS
     The pthread_rwlock_unlock() function may fail if:

     [EINVAL]		The value specified by rwlock is invalid.

     [EPERM]		The current thread does not own the read/write lock.

HISTORY
     The pthread_rwlock_unlock() function first appeared in FreeBSD 3.0.

BSD
								  August 4, 1998							       BSD