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1
3 package jodd.util;
4
5 import junit.framework.TestCase;
6
7 import java.util.Random  ;
8
9 public class MutexTest extends TestCase {
10
11 static Mutex lock = new Mutex();
12
13 static int count = 0;
14 static int end = 0;
15
16 static Random r = new Random ();
17
18 static class FooThread extends Thread {
19 int id;
20 FooThread(int id) {
21 this.id = id;
22 }
23 public void run() {
24 if (r.nextBoolean() == true) {
25 lock.lock();
26 } else {
27 while (lock.tryLock() == false) {
28 ThreadUtil.sleep(30);
29 }
30 }
31 assertEquals(0, count);
32 count++;
33 assertEquals(1, count);
34 ThreadUtil.sleep(40);
35 assertEquals(1, count);
36 count--;
37 assertEquals(0, count);
38 lock.unlock();
39 end++;
40 }
41 }
42
43 public void testMutex() {
44 for (int i = 0; i < 10; i++) {
45 end = 0;
46 int total = 100;
47 while (total > 0) {
48 FooThread thread = new FooThread(total);
49 thread.setDaemon(false);
50 thread.start();
51 total--;
52 }
53 while (end < 100) {
54 ThreadUtil.sleep(25);
55 }
56 assertEquals(100, end);
57 }
58
59 }
60 }
61 |
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