The 386 supports four privilege rings (0 through 3), though in practice nearly all operating systems use just two: ring 0 for the kernel and ring 3 for user programs. Three privilege levels interact on every segment access: CPL (Current Privilege Level), DPL (Descriptor Privilege Level), and RPL (Requested Privilege Level).
No more hoping producers cooperate. The policy you choose determines what happens when the buffer fills.
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第七条 对在居民自治工作中做出突出贡献的组织和个人，按照国家有关规定给予表彰、奖励。