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-<HTML>
-<HEAD>
-   <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
-   <META NAME="Author" CONTENT="James CE Johnson">
-   <TITLE>ACE Tutorial 019</TITLE>
-</HEAD>
-<BODY TEXT="#000000" BGCOLOR="#FFFFFF" LINK="#000FFF" VLINK="#FF0F0F">
-
-<CENTER><B><FONT SIZE=+2>ACE Tutorial 019</FONT></B></CENTER>
-
-<CENTER><B><FONT SIZE=+2>Sharing your Memories</FONT></B></CENTER>
-
-<P>
-<HR WIDTH="100%">
-      Before we move on to shmem.h, I want to show a different approach.  In 
-      this new client/server pair, I use placement new to stuff an object
-      (instead of a blob of bytes) into the shared memory segment.
-    <P>
-      There are a few caveats to putting objects into shared memory.  The
-      most important ones all deal with pointers:
-    <ul>
-      <li>Be sure your pointers point into the shared memory and not
-        local process memory.
-      <li>Only in very special cases will objects with virtual methods 
-        work (because of the VTable pointers).
-    </ul>
-<P>
-That's not to say you shouldn't try...  Just try carefully and test a lot!
-    <HR>
-<HR width=50%><P><center>server2.cpp</center><HR width=50%>
-<PRE>
-<font color=red>// $Id$</font>
-
-<font color=blue>#include</font> "<font color=green>shmem.h</font>"
-
-<font color=blue>#if defined</font> (<font color=purple>ACE_LACKS_SYSV_SHMEM</font>)
-int 
-main (int, char *[])
-{
-  ACE_ERROR_RETURN ((LM_ERROR,
-                     "<font color=green>System V Shared Memory not available on this platform\n</font>"),
-                    100);
-}
-#else <font color=red>// ACE_LACKS_SYSV_SHMEM</font>
-int 
-main (int, char *argv[])
-{
-  <font color=red>// Be sure the segment is sized to hold our object.</font>
-  ACE_Shared_Memory_SV shm_server (SHM_KEY,
-                                   sizeof (SharedData), 
-                                   <font color=#008888>ACE_Shared_Memory_SV::ACE_CREATE</font>);
-  char *shm = (char *) shm_server.malloc ();
-
-  if (shm == 0)
-    ACE_ERROR_RETURN ((LM_ERROR,
-                       "<font color=green>%p\n\t(%P|%t) Cannot create shared memory segment.\n</font>"
-                       "<font color=green>\tUse 'ipcs' to see if it already exists\n</font>", 
-                       argv[0]),
-                      100);
-
-  ACE_DEBUG ((LM_INFO,
-              "<font color=green>(%P|%t) Shared Memory is at 0x%x\n</font>",
-              shm ));
-
-  <font color=red>/*
-    Use the placement new syntax to stuff the object into the
-    correct location.  I think they generally reserve this for
-    the advanced class...
-    */</font>
-  SharedData *sd = new (shm) SharedData;
-
-  <font color=red>// Use the set() method to put some data into the object</font>
-  sd->set ();
-
-  <font color=red>// Set the 'available' flag to zero so that we can wait on it</font>
-  sd->available (0);
-
-  <font color=red>/*
-    Another cheesy busy loop while we wait for the object to
-    become available.  The cool way would be to hide a semaphore 
-    or two behind this method call & eliminate the sleep.
-    */</font>
-  while (sd->available () == 0)
-    <font color=#008888>ACE_OS::sleep</font> (1);
-
-  <font color=red>// Show the user what's in the segment</font>
-  sd->show ();
-
-  <font color=red>// All done.</font>
-  if (shm_server.remove () &lt; 0)
-    ACE_ERROR ((LM_ERROR,
-                "<font color=green>%p\n</font>",
-                "<font color=green>remove</font>"));
-  return 0;
-}
-
-<font color=blue>#endif</font> <font color=red>/* ACE_LACKS_SYSV_SHMEM */</font>
-</PRE>
-<HR width=50%><P><center>client2.cpp</center><HR width=50%>
-<PRE>
-<font color=red>// $Id$</font>
-
-<font color=blue>#include</font> "<font color=green>shmem.h</font>"
-
-<font color=blue>#if defined</font>(<font color=purple>ACE_LACKS_SYSV_SHMEM</font>)
-int 
-main (int, char *[])
-{
-  ACE_ERROR_RETURN ((LM_ERROR,
-                     "<font color=green>System V Shared Memory not available on this platform\n</font>"),
-                    100);
-}
-#else <font color=red>// ACE_LACKS_SYSV_SHMEM</font>
-int 
-main (int, char *[])
-{
-  ACE_Shared_Memory_SV shm_client (SHM_KEY,
-                                   sizeof (SharedData));
-    
-  char *shm = (char *) shm_client.malloc ();
-
-  ACE_DEBUG ((LM_INFO,
-              "<font color=green>(%P|%t) Shared Memory is at 0x%x\n</font>",
-              shm));
-
-  <font color=red>/*
-    More placement new.  The constructor parameter prevents
-    clobbering what the server may have written with it's show() 
-    method.
-    */</font>
-  SharedData *sd = new (shm) SharedData (0);
-
-  <font color=red>// Show it</font>
-  sd->show ();
-
-  <font color=red>// Change it</font>
-  sd->set ();
-
-  <font color=red>// Advertise it</font>
-  sd->available (1);
-
-  shm_client.close ();
-        
-  return 0;
-}
-
-<font color=blue>#endif</font> <font color=red>/* ACE_LACKS_SYSV_SHMEM */</font>
-</PRE>
-<P><HR WIDTH="100%">
-<CENTER>[<A HREF="../online-tutorials.html">Tutorial Index</A>] [<A HREF="page05.html">Continue This Tutorial</A>]</CENTER>