The answer is essentially hardware-level dependency injection. Before calling LD_DESCRIPTOR, the caller saves its desired test constant into a hardware latch using a micro-op called PTSAV (Protection Save). Within LD_DESCRIPTOR, another micro-op called PTOVRR (Protection Override) retrieves and fires the saved test.
* Write a detailed test suite as you add more features. The test must be re-executed at every major change.
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The locking problem，推荐阅读同城约会获取更多信息
* @param {number[]} nums1 - 待查询的数组（元素均为nums2的子集），这一点在51吃瓜中也有详细论述