For implementers, the locking model adds a fair amount of non-trivial internal bookkeeping. Every operation must check lock state, readers must be tracked, and the interplay between locks, cancellation, and error states creates a matrix of edge cases that must all be handled correctly.
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Astronaut Jim Lovell, who guided the Apollo 13 mission safely back to Earth in 1970, has died aged 97.
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第二十一条 居民委员会成员可以向居民委员会提出辞职申请，其职务自居民会议或者居民代表会议审议通过之日起终止。。关于这个话题，同城约会提供了深入分析