PTHREAD_RWLOCK_UNLOCK(3) |
FreeBSD Library Functions Manual |
PTHREAD_RWLOCK_UNLOCK(3) |
NAME
pthread_rwlock_unlock —
release a read/write lock
LIBRARY
POSIX Threads Library (libpthread, -lpthread)
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.
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.