can reuse the array when ((union alloc_header *)data)[-1].ref is zero.
The first problem is hard to quantify. It is a designer’s call what “too many responsibilities” is (well, only until we see it in code, then it will be more apparent). If you were to say “one responsibility per module”, you would often end up with a plethora of small modules. Such a situation increases the cognitive load of the design. The same will happen if you assign too many responsibilities to each module. Of course, the High Cohesion pattern is something that will come in handy here.
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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.。关于这个话题，服务器推荐提供了深入分析