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RaceConditionFix.java
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49 lines (43 loc) · 1.11 KB
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//
// 编译命令：
// javac -encoding UTF8 RaceConditionFix.java
//
public class RaceConditionFix {
private static int _sharedCounter = 0;
private synchronized static void dekker1() {
_sharedCounter++;
}
private synchronized static void dekker2() {
_sharedCounter++;
}
public static void main(String[] args) throws Exception {
if ( args.length != 1 ) {
System.out.println("使用方法: java RaceCondition <循环次数>");
return;
}
final int loopCount = Integer.parseInt(args[0]);
Thread thread1 = new Thread(new Runnable() {
public void run() {
for ( int i = 0; i < loopCount; ++i ) {
dekker1();
}
}
});
Thread thread2 = new Thread(new Runnable() {
public void run() {
for ( int i = 0; i < loopCount; ++i ) {
dekker2();
}
}
});
thread1.start();
thread2.start();
thread1.join();
thread2.join();
int expected_sum = 2 * loopCount;
if ( _sharedCounter != expected_sum ) {
System.out.println(
String.format("资源竞争问题: 实际结果 $1%d 不等于期望结果 $2%d", _sharedCounter, expected_sum));
}
}
}