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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 010</TITLE>
-</HEAD>
-<BODY TEXT="#000000" BGCOLOR="#FFFFFF" LINK="#000FFF" VLINK="#FF0F0F">
-
-<CENTER><B><FONT SIZE=+2>ACE Tutorial 010</FONT></B></CENTER>
-
-<CENTER><B><FONT SIZE=+2>Passing chunks of data through an ACE_Message_Queue</FONT></B></CENTER>
-
-
-<HR WIDTH="100%">
-<P>
-
-Our <A HREF="task.h">Task</A> object executes in one or more threads
-and reads from the message queue it contains.
-<P>
-
-<HR WIDTH="100%">
-<PRE>
-
-#include "ace/Task.h"
-
-/*
- Like the thread-pool server tutorial, we'll derive from ACE_Task<>.
- Our goal here is to show off the ACE_Message_Queue and the best way
- to do that is to use one to pass data between threads. The easiest
- way to create threads is with ACE_Task<>
- */
-class Task : public ACE_Task < ACE_MT_SYNCH >
-{
-public:
-
- typedef ACE_Task < ACE_MT_SYNCH > inherited;
-
- /*
- The constructor/destructor are simple but take care of some
- necessary housekeeping.
- */
- Task (void);
- ~Task (void);
-
- /*
- To make our Task<> derivative look more like other ACE objects
- I've added an open() method. It will take care of activate()ing
- the object.
- */
- int open (int threads = 1);
-
- /*
- Our worker method
- */
- int svc (void);
-
- /*
- All we'll do here is print a message to the user.
- */
- int close (u_long flags = 0);
-
-protected:
- /*
- Just to be clever, I'll use an ACE_Barrier to cause the threads
- to sync in svc() before doing any real work.
- */
- ACE_Barrier *barrier_;
-};
-</PRE>
-<HR WIDTH="100%">
-<P>
-The only thing here that we didn't see in the thread-pool server is the
-ACE_Barrier. The application logic really doesn't need it but it is a
-handy way to synchronize the threads at the beginning of svc(). In testing
-I found that if I didn't sync svc(), the first thread to get activated would
-tend to get all of the messages before the other threads came alive.
-<P>
-<HR WIDTH="100%">
-
-<CENTER>[<A HREF="..">Tutorial Index</A>] [<A HREF="page05.html">Continue
-This Tutorial</A>]</CENTER>
-
-</BODY>
-</HTML>