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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.，详情可参考WPS官方版本下载
siftDown(arr, i, 0); // 对剩余i个元素重新建堆