Manual Pages  — PTHREAD_MUTEX_UNLOCK

pthread_mutex_unlock – unlock a mutex

LIBRARY SYNOPSIS DESCRIPTION RETURN VALUES ERRORS SEE ALSO STANDARDS

POSIX Threads Library (libpthread, -lpthread)

#include <pthread.h>

int
pthread_mutex_unlock(pthread_mutex_t *mutex);

If the current thread holds the lock on mutex, then the pthread_mutex_unlock() function unlocks mutex.

If the argument pointed by the mutex is a robust mutex in the inconsistent state, and the call to pthread_mutex_consistent() function was not done prior to unlocking, further locking attempts on the mutex mutex are denied and locking functions return ENOTRECOVERABLE error.

If successful, pthread_mutex_unlock() will return zero, otherwise an error number will be returned to indicate the error.

The pthread_mutex_unlock() function will fail if:

[EINVAL]
	The value specified by mutex is invalid.
[EPERM]
	The current thread does not hold a lock on mutex.

The pthread_mutex_unlock() function conforms to IEEE Std 1003.1-96 ("POSIX.1").