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Bats in Churches。同城约会对此有专业解读
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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.，这一点在safew官方下载中也有详细论述
Дарья Устьянцева (редактор отдела «Мир»)