Java锁是如何保证数据可见性的
引言
在 java.util.concurrent.locks.Lock 接口的Javadoc中有这样一段话：
All Lock implementations must enforce the same memory synchronization semantics as provided by the built-in monitor lock :
- A successful lock operation acts like a successful monitorEnter action
- A successful unlock operation acts like a successful monitorExit action
Unsuccessful locking and unlocking operations, and reentrant locking/unlocking operations, do not require any memory synchronization effects.
这段话的核心是j.u.c.locks.Lock接口的实现类具有和synchronized内置锁一样的内存同步语义。
不同于由JVM底层实现的内置锁，Lock接口的实现类是直接用Java代码实现的。如何保证了内存中数据的可见性？下面进行一下分析。
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