In this case, the behavior is an implementation detail, not particularly defined nor explained anywhere. The mutex is an off-the-shelf parking_lot::RWMutex, from the parking_lot crate. It has eventual fairness, which means that readers will eventually acquire the lock, even during high write-throughput scenarios. They will be randomly delayed, though, up to 0.5ms. The parking_lot crate is a Rust port of WebKit’s original WTF::Lock — this 2024 changeset shows how eventual fairness was implemented there. You should read it, it has very good performance insights on mutex contention. Think of it as a palate cleanser from this blog post. Now back to the hash table & the lock.
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第二百五十五条 海上货物运输保险合同可以由被保险人背书或者以其他方式转让，合同的权利义务随之转移。合同转让时尚未支付保险费的，被保险人和合同受让人承担连带支付责任。。新收录的资料对此有专业解读
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