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1 <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
2 <html>
3 <head>
4 <title>JSR 166 Snapshot Introduction.</title>
5 </head>
6
7 <body bgcolor="#ffffee" vlink="#0000aa" link="#cc0000">
8 <h1>JSR 166 Snapshot Introduction.</h1>
9
10 by <a href="http://gee.cs.oswego.edu/dl">Doug Lea</a>
11 <p>
12
13 To join a mailing list discussing this JSR, go to:
14 <A HREF="http://altair.cs.oswego.edu/mailman/listinfo/concurrency-interest"> http://altair.cs.oswego.edu/mailman/listinfo/concurrency-interest</A> .
15
16 <p>
17 <em>
18 Disclaimer - This prototype is experimental code developed as part of
19 JCP JSR166 and made available to the developer community for use
20 as-is. It is not a supported product. Use it at your own risk. The
21 specification, language and implementation are subject to change as a
22 result of your feedback. Because these features have not yet been
23 approved for addition to the Java language, there is no schedule for
24 their inclusion in a product.
25 </em>
26
27 <p> JSR166 introduces package <tt>java.util.concurrent</tt> containing utility
28 classes commonly useful in concurrent programming. Like package
29 java.util, it includes a few small standardized extensible frameworks,
30 as well as some classes that provide useful functionality and are
31 otherwise tedious or difficult to implement. Descriptions of the main
32 components may be found in the associated package documentation.
33
34 <p> JSR166 also includes a few changes and additions in packages
35 outside of java.util.concurrent: java.lang, to address uncaught
36 exceptions, and java.util to better integrate with collections. Here
37 are brief descriptions.
38
39 <h2>Queues</h2>
40
41 A basic (nonblocking) {@link java.util.Queue} interface extending
42 java.util.Collection is introduced into java.util. Existing class
43 java.util.LinkedList is adapted to support Queue, and a new
44 non-thread-safe {@link java.util.PriorityQueue} is added.
45
46 <h2>Uncaught Exception Handlers</h2>
47
48 The java.lang.Thread class is modified to allow per-thread
49 installation of handlers for uncaught exceptions. Ths optionally
50 disassociates these handlers from ThreadGroups, which has proven to be
51 too inflexible in many multithreaded programs. (Note that the
52 combination of features in JSR166 make ThreadGroups even less likely
53 to be used in most programs. Perhaps they will eventually be
54 deprecated.)
55
56 <p> Additionally, java.lang.ThreadLocal now supports a means to remove
57 a ThreadLocal, which is needed in some thread-pool and worker-thread
58 designs.
59
60 <hr>
61 <address><A HREF="http://gee.cs.oswego.edu/dl">Doug Lea</A></address>
62 </body>
63 </html>

dl@cs.oswego.edu
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