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	https://github.com/ByteVortex/JavaGuide/blob/main/docs/java/concurrent/jmm.md#指令重排序
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	https://github.com/ByteVortex/JavaGuide/blob/main/docs/java/concurrent/jmm.md#什么是-jmm为什么需要-jmm
《JSR-133：Java Memory Model and Thread Specification》	http://www.cs.umd.edu/~pugh/java/memoryModel/CommunityReview.pdf
	https://github.com/ByteVortex/JavaGuide/blob/main/docs/java/concurrent/jmm.md#jmm-是如何抽象线程和主内存之间的关系
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	https://github.com/ByteVortex/JavaGuide/blob/main/docs/java/concurrent/jmm.md#happens-before-原则是什么
《Time，Clocks and the Ordering of Events in a Distributed System》	https://lamport.azurewebsites.net/pubs/time-clocks.pdf
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	https://github.com/ByteVortex/JavaGuide/blob/main/docs/java/concurrent/jmm.md#参考
http://concurrent.redspider.group/RedSpider.html	http://concurrent.redspider.group/RedSpider.html
https://tech.meituan.com/2014/09/23/java-memory-reordering.html	https://tech.meituan.com/2014/09/23/java-memory-reordering.html
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