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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> |
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