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浅析 synchronized 底层实现与锁相关 | Java（下）

常见的锁自旋锁如果持有锁的线程能在很短时间内释放锁资源，那么那些等待竞争锁的线程就不需要做内核态和用户态之间的切换进入阻塞挂起状态，它们只需要等一等(自旋)，等持有锁的线程释放锁后即可立即获取锁，这样就避免用户线程和内核的切换的消耗。但是线程自旋是需要消耗 CPU 的，说白了就是让 CPU 在做无用...

浅析 synchronized 底层实现与锁相关 | Java（上）

引言一切的最开始都是源自为什么？为什么加了锁 synchronized 关键字，就可以实现同步?synchronized 底层到底做了什么优化？Java 中的各种锁及锁膨胀？用户态、内核态与上下文切换到底是什么鬼？什么叫自旋锁，它与 CAS 的关系？对象头是什么玩意，什么又是 Mark...

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更新时间 2022-11-21 10:09:22

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