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<td align=center><a href=PACE-overview.html>PACE Overview</a></td>
<td align=center><a href=PACE-obtain.html>PACE Obtain</a></td>
<td align=center><a href=PACE-docs.html>PACE Documentation</a></td>
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<h2>PACE Abstract</h2>
<p>PACE is a POSIX compliant middleware library that was
written to allow developers to use one common programming
API to access POSIX semantics across multiple, different
operating systems, some of which are not currently POSIX
compliant.
</p>
<p>PACE is part of the open source ACE+TAO library/framework
and its implementation was initiated in response to the RT
DII COE project at BOEING that specifically targeted
operating systems NT4 SP6, LynxOS 3.1.0a and SunOS 5.8.
The RT DII COE project wants to build a Mission Application
Independent programming framework described as an
architecture, an approach, a collection of reusable software,
a software infrastructure and a set of guidelines and
standards. The proposed framework consists of three layers:
the kernel, the data exchange layer and common Support
Applications.
</p>
<p>Such an ideal framework demands a strong, robust
infrastructure and as such, ACE+TAO was chosen to be part
of this project. ACE is the TAO developers API, essentially
making TAO platform independent (or dependent on which platform
ACE is ported to). As such, ACE provides very high level
abstractions and key pattern techniques but handles different
platforms, especially non-POSIX platforms, on a case-by-case
basis (Win32 and VXWorks are two good examples).
</p>
<p>PACE was born to abstract support for current and additional
non-POSIX platforms away from ACE, thus, becoming an API for
ACE developers to write to. Initial PACE support was limited
to the previously mentioned DII COE platforms. Funding is now
available to PACE to more of the platforms ACE supports,
potentially encapsulating all of the platforms ACE currently
supports. This will help separate the concerns of the current
ACE+TAO framework so that:
</p>
<ul>
<li>(PACE = low level, operating system middleware)</li>
<li>(ACE = high level, pattern oriented abstraction API)</li>
<li>(TAO = open source ORB)</li>
</ul>
<p>In addition to presenting some of the PACE code, I intend to
discuss some of the pitfalls of porting middleware and how we
overcame them in our current work on PACE as well as how they
should be addressed as PACE continues to grow.
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<p>Additional information regarding
<a href="http://www.cs.wustl.edu/~schmidt/ACE.html">ACE</a>
and
<a href="http://www.cs.wustl.edu/~luther/PACE">PACE</a>
and
<a href="http://www.cs.wustl.edu/~schmidt/TAO.html">TAO</A>
is available as well as a
<a href="http://www.cs.wustl.edu/~schmidt/TAO-obtain.html">
full source distribution</a> of TAO + ACE + PACE.
</p>
<p>If you have any questions, suggestions or contributions
regarding PACE, please
<a href="mailto:pace-users@cs.wustl.edu">write</a>
to us or subscribe to the pace-users mailing list
(send email to
<a href="mailto:majordomo@cs.wustl.edu">
majordomo@cs.wustl.edu</a>
with <b>"subscribe pace-users"</b> in the <i>body</i>,
not the subject line ;-)
</p>
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