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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const consumer1 = shared.pull();
至于刘强东能否成功、何时成功，仍有待时间检验。
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