Weakest Weak Strong Strongest Strong*
2021年，在生存线上苦苦挣扎了多年之后，松下终于下定决心从电视机生产领域大举撤退，这一年松下被传出大幅缩小电视机业务，自主生产仅保留部分高端机型，总量约为100万台，仅为高峰期的5%。
，更多细节参见夫子
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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.