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.