java 测试排序_java 指令重排序测试

/*** 指令重排序测试

*

*@authorzhangxz

* @date 2019-11-17 16:40*/

public classCmdReorderTest {private static int a = 0;private static int b = 0;private static int c = 0;private static int d = 0;private static int e = 0;private static int f = 0;private static int g = 0;private static int h = 0;/*private static volatile int a = 0;

private static volatile int b = 0;

private static volatile int c = 0;

private static volatile int d = 0;

private static volatile int e = 0;

private static volatile int f = 0;

private static volatile int g = 0;

private static volatile int h = 0;*/

private static ReentrantLock lock = newReentrantLock();public static void main(String[] args) throwsInterruptedException {for (int i = 0; i < 500000; i++) {//join可以保证线程a b都执行完成之后，再继续下一次循环

ThreadA threadA = newThreadA();

threadA.start();

ThreadB threadB= newThreadB();

threadB.start();

threadA.join();

threadB.join();//清空数据，便于测试

a = 0;

b= 0;

c= 0;

d= 0;

e= 0;

f= 0;

g= 0;

h= 0;

}

}static class ThreadA extendsThread {

@Overridepublic voidrun() {

lock.lock();try{

a= 1;

b= 1;

c= 1;

d= 1;

e= 1;

f= 1;

g= 1;

h= 1;

}finally{

lock.unlock();

}

}

}static class ThreadB extendsThread {

@Overridepublic voidrun() {

lock.lock();try{if (b == 1 && a == 0) {

System.out.println("b=1");

}if (c == 1 && (a == 0 || b == 0)) {

System.out.println("c=1");

}if (d == 1 && (a == 0 || b == 0 || c == 0)) {

System.out.println("d=1");

}if (e == 1 && (a == 0 || b == 0 || c == 0 || d == 0)) {

System.out.println("e=1");

}if (f == 1 && (a == 0 || b == 0 || c == 0 || d == 0 || e == 0)) {

System.out.println("f=1");

}if (g == 1 && (a == 0 || b == 0 || c == 0 || d == 0 || e == 0 || f == 0)) {

System.out.println("g=1");

}if (h == 1 && (a == 0 || b == 0 || c == 0 || d == 0 || e == 0 || f == 0 || g == 0)) {

System.out.println("h=1");

}

}finally{

lock.unlock();

}

}

}

}