NAME

mtx_unlock — unlocks a previously acquired mutex

SYNOPSIS

library “threads”
#include <threads.h>

int
mtx_unlock(mtx_t *mtx);

DESCRIPTION

The function mtx_unlock() will unlock a previously acquired mutex mtx.

A thread can only unlock a mutex if it has been acquired by that thread before.

If recursive mutex acquisition is enabled and the mutex has been acquired by the same thread multiple times mtx_unlock() needs to be called from that thread an equal number of times before any other thread can acquire the mutex.

RETURN VALUES

Upon success mtx_unlock() returns thrd_success, in the case of an error thrd_error will be returned.

SEE ALSO

mtx_init(3) mtx_lock(3) mtx_timedlock(3) mtx_trylock(3) mtx_destroy(3)

HISTORY

The mtx_unlock() function first appeared in the C11 standard ISO/IEC 9899:2011.

AUTHORS

Jan Adelsbach <jan@jadelsbach.de>