reader/sorter machine connected by serial channel to an IBM 1401 computer.
The semantics around releasing locks with pending reads were also unclear for years. If you called read() but didn't await it, then called releaseLock(), what happened? The spec was recently clarified to cancel pending reads on lock release – but implementations varied, and code that relied on the previous unspecified behavior can break.
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而这种“消失”并非偶然，而是一场持续数年的缓慢退潮。
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