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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据悉，小德这次春节小长假，除了回老家过年，也顺便开启了一次总里程达2500公里的自驾旅行。