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.
a CAS to push entries onto the free list is worth experimenting with.，详情可参考WPS下载最新地址
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a_list = soup.select("a.post-link")