"author": author,
Before diving into API design, it's worth asking: what is a stream?
，这一点在雷电模拟器官方版本下载中也有详细论述
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The A/D bits exist entirely for the operating system's benefit. The Accessed bit tells the OS which pages have been recently used, enabling page replacement algorithms to choose pages to evict when memory runs low. The Dirty bit tells the OS which pages have been modified and must be written back to disk before eviction; clean pages can simply be discarded and re-read from disk later.