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<H1>Annex E</H1>
<H2>(normative)</H2>
<H1>Distributed Systems</H1>
<DIV Class="Paranum"><FONT SIZE=-2>1</FONT></DIV>
<DIV Class="Normal"> [This Annex defines facilities for supporting
the implementation of distributed systems using multiple partitions working
cooperatively as part of a single Ada program.] </DIV>
<H4 ALIGN=CENTER>Extensions to Ada 83</H4>
<DIV Class="Paranum"><FONT SIZE=-2>1.a</FONT></DIV>
<DIV Class="Annotations"><FONT SIZE=-1><A NAME="I6942"></A>This Annex
is new to Ada 95. </FONT></DIV>
<H4 ALIGN=CENTER>Post-Compilation Rules</H4>
<DIV Class="Paranum"><FONT SIZE=-2>2</FONT></DIV>
<DIV Class="Normal"> <A NAME="I6943"></A><A NAME="I6944"></A><A NAME="I6945"></A>A
<I>distributed system</I> is an interconnection of one or more <I>processing
nodes</I> (a system resource that has both computational and storage
capabilities), and zero or more <I>storage nodes</I> (a system resource
that has only storage capabilities, with the storage addressable by one
or more processing nodes).</DIV>
<DIV Class="Paranum"><FONT SIZE=-2>3</FONT></DIV>
<DIV Class="Normal"> <A NAME="I6946"></A>A <I>distributed program</I>
comprises one or more partitions that execute independently (except when
they communicate) in a distributed system.</DIV>
<DIV Class="Paranum"><FONT SIZE=-2>4</FONT></DIV>
<DIV Class="Normal"> <A NAME="I6947"></A>The process of mapping the
partitions of a program to the nodes in a distributed system is called
<I>configuring the partitions of the program</I>. </DIV>
<H4 ALIGN=CENTER>Implementation Requirements</H4>
<DIV Class="Paranum"><FONT SIZE=-2>5</FONT></DIV>
<DIV Class="Normal"> The implementation shall provide means for explicitly
assigning library units to a partition and for the configuring and execution
of a program consisting of multiple partitions on a distributed system;
the means are implementation defined. </DIV>
<DIV Class="Paranum"><FONT SIZE=-2>5.a</FONT></DIV>
<DIV Class="Annotations"><FONT SIZE=-1><B>Implementation defined: </B>The
means for creating and executing distributed programs.</FONT></DIV>
<H4 ALIGN=CENTER>Implementation Permissions</H4>
<DIV Class="Paranum"><FONT SIZE=-2>6</FONT></DIV>
<DIV Class="Normal"> An implementation may require that the set of
processing nodes of a distributed system be homogeneous.</DIV>
<DIV Class="NotesHeader"><FONT SIZE=-1>NOTES</FONT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>7</FONT></DIV>
<DIV Class="Notes"><FONT SIZE=-1>1 The partitions comprising
a program may be executed on differently configured distributed systems
or on a non-distributed system without requiring recompilation. A distributed
program may be partitioned differently from the same set of library units
without recompilation. The resulting execution is semantically equivalent.</FONT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>8</FONT></DIV>
<DIV Class="Notes"><FONT SIZE=-1>2 A distributed program retains
the same type safety as the equivalent single partition program.</FONT></DIV>
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