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2     <html>
3     <head>
4     <title>JSR 166 Snapshot Introduction.</title>
5     </head>
7     <body bgcolor="#ffffee" vlink="#0000aa" link="#cc0000">
8     <h1>JSR 166 Snapshot Introduction.</h1>
10     by <a href="http://gee.cs.oswego.edu/dl">Doug Lea</a>
11     <p>
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> .
16     <p>
17     <em>
18     Disclaimer - This prototype is experimental code developed as part of
19 dl 1.3 JCP JSR166 and made available to the developer community for use
20 tim 1.1 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>
27 dl 1.8 <p> JSR166 introduces package <tt>java.util.concurrent</tt> containing
28     utility classes commonly useful in concurrent programming. Like
29     package java.util, it includes a few small standardized extensible
30     frameworks, as well as some classes that provide useful functionality
31     and are otherwise tedious or difficult to implement. JSR-166 focusses
32     on breadth, prviding critical functionality useful across a wide range
33     of concurrent programming styles and applications, ranging from
34     low-level atomic operations, to customizable locks and synchronization
35     aids, to various concurrent data structures, to thread pools.
36     Descriptions of the main components may be found in the associated
37     package documentation.
38 dl 1.7
39     <p> JSR166 also includes a few changes and additions in packages
40 dl 1.8 outside of java.util.concurrent. Here are brief descriptions.
41 tim 1.1
42     <h2>Queues</h2>
44 dl 1.3 A basic (nonblocking) {@link java.util.Queue} interface extending
45     java.util.Collection is introduced into java.util. Existing class
46     java.util.LinkedList is adapted to support Queue, and a new
47 dl 1.7 non-thread-safe {@link java.util.PriorityQueue} is added.
48 tim 1.1
49     <h2>Uncaught Exception Handlers</h2>
51 dl 1.3 The java.lang.Thread class is modified to allow per-thread
52 tim 1.1 installation of handlers for uncaught exceptions. Ths optionally
53     disassociates these handlers from ThreadGroups, which has proven to be
54 dl 1.3 too inflexible in many multithreaded programs. (Note that the
55     combination of features in JSR166 make ThreadGroups even less likely
56     to be used in most programs. Perhaps they will eventually be
57     deprecated.)
58 dl 1.2
59 dl 1.8 <h2>High precision timing</h2>
61     Method <tt>nanoTime</tt> is added to <tt>java.lang.System</tt>. It
62     provides a high-precision timing facility that is distinct from
63     and uncoordinated with <tt>System.currentTimeMillis</tt>.
65     <h2>Removing ThreadLocals</h2>
67     The java.lang.ThreadLocal class now supports a means to remove a
68     ThreadLocal, which is needed in some thread-pool and worker-thread
69 dl 1.2 designs.
70 tim 1.1
71     <hr>
72     <address><A HREF="http://gee.cs.oswego.edu/dl">Doug Lea</A></address>
73     </body>
74     </html>

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