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   <title>JSR 166 Snapshot Introduction.</title>

  <body bgcolor="#ffffee" vlink="#0000aa" link="#cc0000">
  <h1>JSR 166 Snapshot Introduction.</h1>

  by <a href="http://gee.cs.oswego.edu/dl">Doug Lea</a>

To join a mailing list discussing this JSR, go to:
<A HREF="http://altair.cs.oswego.edu/mailman/listinfo/concurrency-interest"> http://altair.cs.oswego.edu/mailman/listinfo/concurrency-interest</A> .

 Disclaimer - This prototype is experimental code developed as part of
 JCP JSR166 and made available to the developer community for use
 as-is. It is not a supported product. Use it at your own risk. The
 specification, language and implementation are subject to change as a
 result of your feedback. Because these features have not yet been
 approved for addition to the Java language, there is no schedule for
 their inclusion in a product.

<p> JSR166 introduces package <tt>java.util.concurrent</tt> containing utility
classes commonly useful in concurrent programming. Like package
java.util, it includes a few small standardized extensible frameworks,
as well as some classes that provide useful functionality and are
otherwise tedious or difficult to implement.  Descriptions of the main
components may be found in the associated package documentation.

<p> JSR166 also includes a few changes and additions in packages
outside of java.util.concurrent: java.lang, to address uncaught
exceptions, and java.util to better integrate with collections.  Here
are brief descriptions.


A basic (nonblocking) {@link java.util.Queue} interface extending
java.util.Collection is introduced into java.util. Existing class
java.util.LinkedList is adapted to support Queue, and a new
non-thread-safe {@link java.util.PriorityQueue} is added.

<h2>Uncaught Exception Handlers</h2>

The java.lang.Thread class is modified to allow per-thread
installation of handlers for uncaught exceptions. Ths optionally
disassociates these handlers from ThreadGroups, which has proven to be
too inflexible in many multithreaded programs. (Note that the
combination of features in JSR166 make ThreadGroups even less likely
to be used in most programs. Perhaps they will eventually be

<p> Additionally, java.lang.ThreadLocal now supports a means to remove
a ThreadLocal, which is needed in some thread-pool and worker-thread

  <address><A HREF="http://gee.cs.oswego.edu/dl">Doug Lea</A></address>

Doug Lea
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