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1 : tim 1.1 <!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 : 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>
26 :    
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>
43 :    
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>
50 :    
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>
60 :    
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>.
64 :    
65 :     <h2>Removing ThreadLocals</h2>
66 :    
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>

Doug Lea
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