Function unlock_rm

freebsd/kern/kern_rmlock.c:138–178

}

static uintptr_t
unlock_rm(struct lock_object *lock)
{
	struct thread *td;
	struct pcpu *pc;
	struct rmlock *rm;
	struct rm_queue *queue;
	struct rm_priotracker *tracker;
	uintptr_t how;

	rm = (struct rmlock *)lock;
	tracker = NULL;
	how = 0;
	rm_assert(rm, RA_LOCKED | RA_NOTRECURSED);
	if (rm_wowned(rm))
		rm_wunlock(rm);
	else {
		/*
		 * Find the right rm_priotracker structure for curthread.
		 * The guarantee about its uniqueness is given by the fact
		 * we already asserted the lock wasn't recursively acquired.
		 */
		critical_enter();
		td = curthread;
		pc = get_pcpu();
		for (queue = pc->pc_rm_queue.rmq_next;
		    queue != &pc->pc_rm_queue; queue = queue->rmq_next) {
			tracker = (struct rm_priotracker *)queue;
				if ((tracker->rmp_rmlock == rm) &&
				    (tracker->rmp_thread == td)) {
					how = (uintptr_t)tracker;
					break;
				}
		}
		KASSERT(tracker != NULL,
		    ("rm_priotracker is non-NULL when lock held in read mode"));
		critical_exit();
		rm_runlock(rm, tracker);
	}
	return (how);
}

#ifdef KDTRACE_HOOKS
static int