Read write barrier in memory barrier -- concurrency problem

The read-write barrier involves JVM And concurrent programming , But its concept is quite different , Easy to confuse
One 、 Concurrency issues
1、 summary
Volatile The underlying implementation principle of is memory barrier

2、Volatile Ensure visibility and order through read-write barriers

2.1、 Guaranteed visibility

After declaring write barrier , The code before writing the barrier will be synchronized to main memory , Ensure that what the subsequent thread reads is the latest ;

2.2、 To ensure order

however Volatile Instruction interleaving cannot be resolved ：

————————————————
Copyright notice ： This paper is about CSDN Blogger 「 Xingtao 」 The original article of , follow CC 4.0 BY-SA Copyright agreement , For reprint, please attach the original source link and this statement .
Link to the original text ：https://blog.csdn.net/m0_46672151/article/details/123180122