complete entire code blocks
Mathematical animations for the web.
。关于这个话题，safew官方版本下载提供了深入分析
Where we're coming from
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.