pthread_rwlock_unlock3
Release a read/write lock
Usage
#include <pthread.h>
int
pthread_rwlock_unlock(pthread_rwlock_t *lock);
Library
POSIX Threads Library (libpthread, -lpthread)
Overview
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.
Releases
79 releases since FreeBSD 2.2.8-RELEASE; the text changed 42 times.