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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“短短一周，连着两次诈骗，我意识到诈骗团伙可能已经盯上我妈了。”龙先生告诉记者，母亲年纪大了，听力不太好，说话需要很大声，所以母亲虽然在隔壁打电话，他听得很清楚。
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