Contents Index Search Previous Next
Annex E
(normative)
Distributed Systems
1
[This Annex defines facilities for supporting
the implementation of distributed systems using multiple partitions working
cooperatively as part of a single Ada program.]
Extensions to Ada 83
1.a
{extensions to Ada 83}
This Annex is new to Ada 95.
Post-Compilation Rules
2
{processing node}
{storage node} {distributed
system} A
distributed system is
an interconnection of one or more
processing nodes (a system resource
that has both computational and storage capabilities), and zero or more
storage nodes (a system resource that has only storage capabilities,
with the storage addressable by one or more processing nodes).
3
{distributed program}
A
distributed program comprises one or more
partitions that execute independently (except when they communicate)
in a distributed system.
4
{configuration (of the partitions
of a program)} The process of mapping
the partitions of a program to the nodes in a distributed system is called
configuring the partitions of the program.
Implementation Requirements
5
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.
5.a
Implementation defined: The
means for creating and executing distributed programs.
Implementation Permissions
6
An implementation may require that the set of
processing nodes of a distributed system be homogeneous.
7
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.
8
2 A distributed program
retains the same type safety as the equivalent single partition program.
Contents Index Search Previous Next Legal