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Next: <a href="PolyORB-PCS-Internals.html#PolyORB-PCS-Internals" accesskey="n" rel="next">PolyORB PCS Internals</a>, Previous: <a href="Partition-Runtime-Parameters.html#Partition-Runtime-Parameters" accesskey="p" rel="prev">Partition Runtime Parameters</a>, Up: <a href="Building-a-DSA-application-with-PolyORB.html#Building-a-DSA-application-with-PolyORB" accesskey="u" rel="up">Building a DSA application with PolyORB</a> [<a href="About-This-Guide.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html#Index" title="Index" rel="index">Index</a>]</p>
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<h4 class="subsection">8.5.6 Gnatdist Internals</h4>
<p>Here is what goes on in <tt>po_gnatdist</tt> when building a distributed application:
</p>
<ul>
<li> Each compilation unit in the program is compiled into an object module
(as for non distributed applications). This is achieved by calling
gnatmake on the sources of the various partitions.
</li><li> Stubs and skeletons are compiled into object modules (these are pieces of
code that allow a partition running on machine A to communicate with a
partition running on machine B). Several timestamp checks are performed
to avoid useless code recompilation and stub generation.
</li><li> <tt>po_gnatdist</tt> performs a number of consistency checks. For instance it checks
that all packages marked as remote call interface (RCI) and shared
passive (SP) are mapped onto partitions. It also checks that a RCI or SP
package is mapped onto only one partition.
</li><li> Finally, the executables for each partition in the program are
created. The code to launch partitions is embedded in the main partition
except if another option has been specified (see <a href="Pragma-Starter.html#Pragma-Starter">Pragma Starter</a>). In this case, a shell script (or nothing) is generated to
start the partitions on the appropriate machines. This is specially
useful when one wants to write client / server applications where the
number of instances of the partition is unknown.
</li></ul>
<p>All Gnatdist intermediate files (object files, etc) are stored under a
common directory named "dsa". The user may remove this whole directory and
its content when he does not intend to rebuild his distributed
applications.
</p>
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