Java volatile如何理解的相关内容

Java的volatile到底该如何理解？（下）

对于Long和double型变量的特殊规则虚拟机规范中，写64位的double和long分成了两次32位值的操作由于不是原子操作，可能导致读取到某次写操作中64位的前32位，以及另外一次写操作的后32位读写volatile的long和double总是原子的。读写引用也总是原子的商业JVM不会存在这个...

Java的volatile到底该如何理解？（中）

CPU 性能优化手段 - 运行时指令重排序编译器生成指令的次序，可以不同于源代码所暗示的“显然”版本。重排后的指令，对于优化执行以及成熟的全局寄存器分配算法的使用，都是大有脾益的，它使得程序在计算性能上有了很大的提升。指令重排的场景当CPU写缓存时发现缓存区块正被其他CPU占用，为了提高CPU处理性...

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Java的volatile到底该如何理解？（上）

volatile 的实现维度级别实现Java 代码volatile int iByteCode 字节码ACC_VOLATILEJVM 虚拟机规范JVM 内存屏障HotSpot 实现汇编语言调用CPU 级别MESI 原语支持总线锁可见性问题让一个线程对共享变量的修改，能够及时的被其他线程看到。根据JM...

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