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<META NAME="Author" CONTENT="James CE Johnson">
<TITLE>ACE Tutorial 020</TITLE>
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<CENTER><B><FONT SIZE=+2>ACE Tutorial 020</FONT></B></CENTER>
<CENTER><B><FONT SIZE=+2>Sharing your Memories with persistence</FONT></B></CENTER>
<P>
<HR WIDTH="100%">
This tutorial mirrors the previous. Instead of using shared memory,
this time we'll be using a memory-mapped file.
<p>
The cool thing about doing it this way is that we gain
persistence of memory even across reboots. I wonder if you
could memory map a file that's mounted via NFS?
<p>
Like the shared memory tutorial, this one is also very basic and
primitive. I'm assuming you've read that one, so I'll just hit
the high points this time through..
<P>
Kirthika's abstract:
<UL>
Here, the ACE_Shared_Memory_MM class has been used to provide
persistence of the contents of the shared memory resource used by
the server and client. A memory_map which is really a file mapped onto
memory appears like an array which can be
easily manipulated while actually the data is stored in a file thus
making the contents permanent. In the previous tutorial, this wasnt
possible as we were dealing with shared memory allocated from the RAM.
<P>
Again, here too, the example consists of a server and a client sharing
memory
(the mem_map) and the server writing a a-z string to it which will
be successfully converted to uppercase by the client.
<P>
Notice that, similarities in usage abound between the previous and the
current tutorial which will prove to be a force for templatisation.
For that we need to go ahead -- to the next tutorial!
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<CENTER>[<A HREF="../online-tutorials.html">Tutorial Index</A>] [<A HREF="page02.html">Continue This Tutorial</A>]</CENTER>
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