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轻量级锁会自旋吗？
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轻量级锁会自旋吗？
2022-05-22
分类：Java
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对象加锁的入口在ObjectSynchronizer::enter(h_obj, lock, current); 这个方法中（https://github.com/openjdk/jdk/blob/9583e3657e43cc1c6f2101a64534564db2a9bd84/src/hotspot/share/runtime/synchronizer.cpp#L348 ）。
enter方法代码如下：
大概过程就是，如果是轻量级锁，则进行CAS(cas_set_mark(markWord::from_pointer(lock), mark))，否则，直接膨胀(inflate())，这个膨胀的过程中没有自旋的操作。
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