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Next: <a href="Regular-Remote-Subprograms-_0028RCI_0029.html#Regular-Remote-Subprograms-_0028RCI_0029" accesskey="n" rel="next">Regular Remote Subprograms (RCI)</a>, Previous: <a href="Pragma-Remote_005fCall_005fInterface.html#Pragma-Remote_005fCall_005fInterface" accesskey="p" rel="prev">Pragma Remote_Call_Interface</a>, Up: <a href="Pragma-Remote_005fCall_005fInterface.html#Pragma-Remote_005fCall_005fInterface" accesskey="u" rel="up">Pragma Remote_Call_Interface</a> &nbsp; [<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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<a name="Overview-of-Pragma-Remote_005fCall_005fInterface-1"></a>
<h4 class="subsubsection">8.1.4.1 Overview of Pragma Remote_Call_Interface</h4>

<p>Library units categorized with this pragma declare subprograms that can be
called and executed remotely. An RCI unit acts as a server for remote calls.
There is no memory space shared between server and clients.
A subprogram call that invokes one such
subprogram is a classical RPC operation; it is a
statically bound operation, because the compiler can determine the identity
of the subprogram being called.
</p>
<p>Dynamically bound calls are provided through two mechanisms:
</p>
<ul>
<li> The dereference of an access-to-subprogram value, i.e. a value whose type is
a remote access-to-subprogram (RAS).

</li><li> A dispatching call whose controlling argument is
an access-to-class-wide operand.
The formal is a remote access-to-class-wide (RACW)
type. These remote access types can be declared in RCI
packages as well.

</li></ul>

<p>A remote access type (RAS or RACW) can be viewed as a fat pointer, that is
to say a structure with a remote address and a local address (like an URL:
<tt>&lt;protocol&gt;</tt>://<tt>&lt;remote<code>-</code>machine&gt;</tt>/<tt>&lt;local<code>-</code>directory&gt;</tt>). The
remote address must denote the host of the partition on which the entity has
been created; the local address describes the local memory
address within the host.
</p>
<p>It is very unlikely that RCI units can be duplicated in the distributed
system. An implementation may allow separate copies of a RCI unit as
long as it ensures that the copies present a consistent state to all clients.
In the general case, preserving consistency is very costly. For this reason, the
implementation may require a RCI unit to be unique in the distributed
system.
</p>



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