It reads like a lovely every day tale, not a fairy tale: no glass slippers, but wellies.
Finding these optimization opportunities can itself be a significant undertaking. It requires end-to-end understanding of the spec to identify which behaviors are observable and which can safely be elided. Even then, whether a given optimization is actually spec-compliant is often unclear. Implementers must make judgment calls about which semantics they can relax without breaking compatibility. This puts enormous pressure on runtime teams to become spec experts just to achieve acceptable performance.，详情可参考体育直播
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The SETBLOCK function always sets the MCB owner when it succeeds. That is, a DOS process may resize any existing memory block, regardless of who owns it, and become the owner. If the resizing succeeds (and resizing to the same or smaller size always will), the calling process will become the owner of the block. Obviously, resizing memory blocks owned by other processes is a risky business.
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