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In Ada a program can be composed of a set of partitions, which execute in parallel and run on separate processors. Programmers can assign library units to partitions. There are two kinds of partitions: active and passive, as defined in the "Distributed Systems" special needs annex, Annex E of [ARM95]. A passive partition does not have its own independent thread of control.
A module within an active partition can issue a procedure call to a module in another partition, using a Remote_Call_Interface (RCI) mechanism, as illustrated in the following diagram. This is a rather advanced topic, and this capability is available only with compilers that conform to Annex E.
| The four dashed boxes in this diagram represent partitions, two active partitions and two passive partitions. Each active partition has a main procedure. The arrow labeled RCI represents a remote call interface between elements of the active partitions. |
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We do not provide a coded illustration of partitions and a distributed system in this introductory volume.
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