PTHREAD_RWLOCK_UNLOCK(3)

NAME
pthread_rwlock_unlock - release a read/write lock

LIBRARY
libc_r

SYNOPSIS
#include <pthread.h>
int
pthread_rwlock_unlock(pthread_rwlock_t *lock);

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 lock 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 susv2.

ERRORS
The pthread_rwlock_unlock() function may fail if:

[EINVAL]
    The value specified by lock 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.