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                # 第二章 Java高并發 原子性,對于32位系統來說long(有64位)型數據的讀寫不是原子性的。 可見性,當一個線程修改一個共享變量的值時,其他線程是否知道。 有序性,指令重排,為了盡量少的中斷流水線。 Happen-Before規則:程序順序原則;volatile規則,寫先于讀;鎖規則:先解鎖后加鎖;傳遞性,A>B,B>C推出A>C;線程start()第一;線程join()最后;線程中斷interrupt()先于被中斷代碼;對象構造函數先執行;
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