void
lock_acquire3(struct lock *lockA, struct lock *lockB, struct lock *lockC)
{
	// Write this
	int splold;
	assert(lockA != NULL);
	assert(lockB != NULL);
	assert(lockC != NULL);
	splold = splhigh();

	while(1)
	{

		// spin while first lock is previously held
		while(*(lockA->status) == 1);

		// status is now 0 (free to acquire)
		if (lock_testAndSet(lockA) == 0)
		{

			// try to get 2nd lock
			if (lock_testAndSet(lockB) == 0 && lock_testAndSet(lockC) == 0)
			{

				// try to get 3rd lock
				if (lock_testAndSet(lockC) == 0)
				{
					// all locks acquired, exit
					break;
				}
				else
				{
					// couldn't get all locks, release A and B
					lock_release(lockA);
					lock_release(lockB);
				}
			}
			else
			{
				// couldn't get both locks, release first
				lock_release(lockA);
			}
		}
	}

	splx(splold);
//	(void)lock;  // suppress warning until code gets written
}