Function do_unlock_umutex

freebsd/kern/kern_umtx.c:2512–2532

* Unlock a userland POSIX mutex. */

 * Unlock a userland POSIX mutex.
 */
static int
do_unlock_umutex(struct thread *td, struct umutex *m, bool rb)
{
	uint32_t flags;
	int error;

	error = fueword32(&m->m_flags, &flags);
	if (error == -1)
		return (EFAULT);

	switch (flags & (UMUTEX_PRIO_INHERIT | UMUTEX_PRIO_PROTECT)) {
	case 0:
		return (do_unlock_normal(td, m, flags, rb));
	case UMUTEX_PRIO_INHERIT:
		return (do_unlock_pi(td, m, flags, rb));
	case UMUTEX_PRIO_PROTECT:
		return (do_unlock_pp(td, m, flags, rb));
	}

	return (EINVAL);
}

static int
do_cv_wait(struct thread *td, struct ucond *cv, struct umutex *m,