NAME
pthread_rwlock_unlock —
release a read/write lock
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.
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.
SEE ALSO
STANDARDS
The pthread_rwlock_unlock() function is
expected to conform to Version 2 of the Single UNIX
Specification (“SUSv2”).
HISTORY
The pthread_rwlock_unlock() function first
appeared in FreeBSD 3.0.