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                #### JMM ``` 共享內存模型指的就是java內存模型,簡稱JMM, JMM決定一個線程對共享變量的寫入時,能對另外一個線程可見。 從抽象的角度來看,JMM定義了線程和主內存之間的抽象關系: 線程的共享變量存儲在主內存(main memory),每個線程中都有一個私有的本地內存(local memory), 本地內存 中存儲了該線程讀寫共享變量的副本。本地內存是JMM的一個抽象概念,并不真實存在,它涵蓋了緩存,寫緩沖區, 寄存器以及其他硬件和編譯器優化。 ``` ![](https://box.kancloud.cn/272d238954bef61e62ce136317db313a_425x379.png) ``` 從上圖看,線程A和線程B之間如要通信的話,必須經歷下面兩個步驟: 1. 線程A把本地內存A中更新過的共享變量刷新到主內存 2. 線程B到主內存中去讀取線程A之前已更新過的共享變量 ```
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