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java | 有序性
source link: https://benpaodewoniu.github.io/2022/12/24/java139/
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- 有序性
- 保证指令不会受
CPU指令并行优化的影响
- 保证指令不会受
i = ...
j = ...
在多线程下，指令可能会发生重排变成
j = ...
i = ...
因为多线程是并行的，所以，指令执行顺序是不确定的。
重排序解决
使用 volatile 进行修饰。
volatile int i = 0;
j = ...
c = ...
d = ...
i = ...
volatile 修饰的变量之前的执行顺序都保持不变。
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