java體系中，volatile關鍵字的作用

原創 风雅车手 2020-06-25 09:13
volatile關鍵字的作用：


1、強制變量，線程直接從內存中讀寫線程，cpu寄存器變量和主內存變量實時同步；


2、訪問一個 volatile 變量會在語句間建立 happens-before 關係


3、確保volatile 變量在jvm編譯中的排序，不會亂序；


4、volatile 變量之前的變量也會自動同步到主存；
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