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Java > Open Source Codes > DiningPhil


1 //
2 // Copyright (C) 2005 United States Government as represented by the
3 // Administrator of the National Aeronautics and Space Administration
4 // (NASA). All Rights Reserved.
5 //
6 // This software is distributed under the NASA Open Source Agreement
7 // (NOSA), version 1.3. The NOSA has been approved by the Open Source
8 // Initiative. See the file NOSA-1.3-JPF at the top of the distribution
9 // directory tree for the complete NOSA document.
10 //
11 // THE SUBJECT SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY OF ANY
12 // KIND, EITHER EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT
13 // LIMITED TO, ANY WARRANTY THAT THE SUBJECT SOFTWARE WILL CONFORM TO
14 // SPECIFICATIONS, ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR
15 // A PARTICULAR PURPOSE, OR FREEDOM FROM INFRINGEMENT, ANY WARRANTY THAT
16 // THE SUBJECT SOFTWARE WILL BE ERROR FREE, OR ANY WARRANTY THAT
17 // DOCUMENTATION, IF PROVIDED, WILL CONFORM TO THE SUBJECT SOFTWARE.
18 //
19
20 class Fork {
21 }
22
23 class Philosopher extends Thread JavaDoc {
24   Fork left;
25   Fork right;
26
27   public Philosopher(Fork left, Fork right) {
28     this.left = left;
29     this.right = right;
30     start();
31   }
32
33   public void run() {
34     // think!
35 synchronized (left) {
36       synchronized (right) {
37         // eat!
38 }
39     }
40   }
41 }
42
43 class DiningPhil {
44   static final int N = 2;
45   public static void main(String JavaDoc[] args) {
46     //Verify.beginAtomic();
47 Fork[] forks = new Fork[N];
48     for (int i = 0; i < N; i++) {
49       forks[i] = new Fork();
50     }
51     for (int i = 0; i < N; i++) {
52       new Philosopher(forks[i], forks[(i + 1) % N]);
53     }
54     //Verify.endAtomic();
55 }
56 }
57
58
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