Function __lockmgr_args

freebsd/kern/kern_lock.c:1296–1605

}

int
__lockmgr_args(struct lock *lk, u_int flags, struct lock_object *ilk,
    const char *wmesg, int pri, int timo, const char *file, int line)
{
	GIANT_DECLARE;
	struct lockmgr_wait lwa;
	struct lock_class *class;
	const char *iwmesg;
	uintptr_t tid, v, x;
	u_int op, realexslp;
	int error, ipri, itimo, queue, wakeup_swapper;
#ifdef LOCK_PROFILING
	uint64_t waittime = 0;
	int contested = 0;
#endif

	if (KERNEL_PANICKED())
		return (0);

	error = 0;
	tid = (uintptr_t)curthread;
	op = (flags & LK_TYPE_MASK);
	iwmesg = (wmesg == LK_WMESG_DEFAULT) ? lk->lock_object.lo_name : wmesg;
	ipri = (pri == LK_PRIO_DEFAULT) ? lk->lk_pri : pri;
	itimo = (timo == LK_TIMO_DEFAULT) ? lk->lk_timo : timo;

	lwa.iwmesg = iwmesg;
	lwa.ipri = ipri;
	lwa.itimo = itimo;

	MPASS((flags & ~LK_TOTAL_MASK) == 0);
	KASSERT((op & (op - 1)) == 0,
	    ("%s: Invalid requested operation @ %s:%d", __func__, file, line));
	KASSERT((flags & (LK_NOWAIT | LK_SLEEPFAIL)) == 0 ||
	    (op != LK_DOWNGRADE && op != LK_RELEASE),
	    ("%s: Invalid flags in regard of the operation desired @ %s:%d",
	    __func__, file, line));
	KASSERT((flags & LK_INTERLOCK) == 0 || ilk != NULL,
	    ("%s: LK_INTERLOCK passed without valid interlock @ %s:%d",
	    __func__, file, line));
	KASSERT(kdb_active != 0 || !TD_IS_IDLETHREAD(curthread),
	    ("%s: idle thread %p on lockmgr %s @ %s:%d", __func__, curthread,
	    lk->lock_object.lo_name, file, line));

	class = (flags & LK_INTERLOCK) ? LOCK_CLASS(ilk) : NULL;

	if (lk->lock_object.lo_flags & LK_NOSHARE) {
		switch (op) {
		case LK_SHARED:
			op = LK_EXCLUSIVE;
			break;
		case LK_UPGRADE:
		case LK_TRYUPGRADE:
		case LK_DOWNGRADE:
			_lockmgr_assert(lk, KA_XLOCKED | KA_NOTRECURSED,
			    file, line);
			if (flags & LK_INTERLOCK)
				class->lc_unlock(ilk);