pthread_rwlock_unlock(3P)

NAME
     pthread_rwlock_unlock - unlock a read-write lock object

C SYNOPSIS
     #include <pthread.h>

     int pthread_rwlock_unlock(pthread_rwlock_t *rwlock);

DESCRIPTION
     Read-write locks allow a thread to exclusively lock some shared data
     while updating that data, or allow any number of threads to have
     simultaneous read-only access to the data.  The pthread_rwlock_unlock()
     function releases a read or write lock held on the read-write lock object
     referenced by rwlock.  If this function is called to release a read lock
     and there are other read locks currently held on the lock object, the
     lock object remains in the read locked state.  If this function is called
     to release the last read or write lock for this lock object, the lock is
     released.  When released, if there are both readers and writers of the
     same priority waiting for the read-write lock, writers will be scheduled
     before readers.

DIAGNOSTICS
     This function returns zero.

SEE ALSO
     pthread_rwlock_init(3P), pthread_rwlock_rdlock(3P),
     pthread_rwlock_wrlock(3P), pthread_rwlockattr_init(3P),
     pthread_rwlockattr_setpshared(3P).