Android Open Source - androidtestdebug Dekker

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License

The source code is released under:

MIT License

Java Source Code

public class Dekker {  
    private static volatile int _flag1 = 0;
  private static volatile int _flag2 = 0;
  private static volatile int _turn = 1;
  private static volatile int _sharedCounter = 0;
//from w  w  w.j  ava 2  s  . c  om
    private static void dekker1() {
      _flag1 = 1;
    _turn = 2;
    while ((_flag2 == 1) && (_turn == 2));
    _sharedCounter++;
    _flag1 = 0;
  }

  private static void dekker2() {
      _flag2 = 1;
    _turn = 1;
    while ((_flag1 == 1) && (_turn == 1));
    _sharedCounter++;
    _flag2 = 0;
  }
  
  public static void main(String[] args) throws Exception {
      if ( args.length != 1 ) {
         System.out.println("????: java Dekker <????>");
       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("???????: ???? $1%d ???????? $2%d", _sharedCounter, expected_sum));
    } else { 
                     System.out.println("Dekker?????????");
                }
  }
}

Java Source Code List

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