Function lockmgr_sunlock_try

freebsd/kern/kern_lock.c:532–546

}

static bool __always_inline
lockmgr_sunlock_try(struct lock *lk, uintptr_t *xp)
{

	for (;;) {
		if (LK_SHARERS(*xp) > 1 || !(*xp & LK_ALL_WAITERS)) {
			if (atomic_fcmpset_rel_ptr(&lk->lk_lock, xp,
			    *xp - LK_ONE_SHARER))
				return (true);
			continue;
		}
		break;
	}
	return (false);
}

static bool
lockmgr_slock_adaptive(struct lock_delay_arg *lda, struct lock *lk, uintptr_t *xp,