Mercurial > hg > blitz_stable

comparison src/EDU/oswego/cs/dl/util/concurrent/SyncSet.java @ 0:3dc0c5604566

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Initial checkin of blitz 2.0 fcs - no installer yet.
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 21 Mar 2009 11:00:06 +0000
parents
children
comparison
equal deleted inserted replaced
-1:000000000000 0:3dc0c5604566
1 /*
2 File: SyncSet.java
3
4 Originally written by Doug Lea and released into the public domain.
5 This may be used for any purposes whatsoever without acknowledgment.
6 Thanks for the assistance and support of Sun Microsystems Labs,
7 and everyone contributing, testing, and using this code.
8
9 History:
10 Date Who What
11 1Aug1998 dl Create public version
12 */
13
14 package EDU.oswego.cs.dl.util.concurrent;
15 import java.util.*;
16
17 /**
18 * SyncSets wrap Sync-based control around java.util.Sets.
19 * They support two additional reader operations than do
20 * SyncCollection: hashCode and equals.
21 * <p>[<a href="http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html"> Introduction to this package. </a>]
22 * @see SyncCollection
23 **/
24
25
26 public class SyncSet extends SyncCollection implements Set {
27
28 /**
29 * Create a new SyncSet protecting the given collection,
30 * and using the given sync to control both reader and writer methods.
31 * Common, reasonable choices for the sync argument include
32 * Mutex, ReentrantLock, and Semaphores initialized to 1.
33 **/
34 public SyncSet(Set set, Sync sync) {
35 super (set, sync);
36 }
37
38 /**
39 * Create a new SyncSet protecting the given set,
40 * and using the given ReadWriteLock to control reader and writer methods.
41 **/
42 public SyncSet(Set set, ReadWriteLock rwl) {
43 super (set, rwl.readLock(), rwl.writeLock());
44 }
45
46 /**
47 * Create a new SyncSet protecting the given set,
48 * and using the given pair of locks to control reader and writer methods.
49 **/
50 public SyncSet(Set set, Sync readLock, Sync writeLock) {
51 super(set, readLock, writeLock);
52 }
53
54 public int hashCode() {
55 boolean wasInterrupted = beforeRead();
56 try {
57 return c_.hashCode();
58 }
59 finally {
60 afterRead(wasInterrupted);
61 }
62 }
63
64 public boolean equals(Object o) {
65 boolean wasInterrupted = beforeRead();
66 try {
67 return c_.equals(o);
68 }
69 finally {
70 afterRead(wasInterrupted);
71 }
72 }
73
74 }
75
76