使volatile字段具有原子性操作 - ImportNew



使volatile字段具有原子性操作 - ImportNew

对于volatile字段的期望目标是它能够在单线程和多线程程序之间保持一致行为。它们不是不可能保持行为一致，但是它们并没有保证行为一定一致。

在Java5以上版本中，这一问题的解决方法是使用一类以Atomic为开头命名的Java类。但是这种方式的性能是十分低下的。在内存上它添加了一个头标记和填充物，在性能上它添加了引用和对相对位置的控制，在语法上它变得不那么容易去使用。

在我看来，使volatile字段表现的和我们预期方式一致的最简单办法是JVM必须支持原子字段，这种方式并不会被当前的Java内存模型所禁止但也不会得到保障。


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