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<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<META NAME="Author" CONTENT="Bob McWhirter">
<TITLE>ACE Tutorial 014</TITLE>
</HEAD>
<BODY TEXT="#000000" BGCOLOR="#FFFFFF" LINK="#000FFF" VLINK="#FF0F0F">
<CENTER><B><FONT SIZE=+2>ACE Tutorial 014</FONT></B></CENTER>
<CENTER><B><FONT SIZE=+2>ACE_Stream Tutorial, Of Sorts</FONT></B></CENTER>
<P>
<HR WIDTH="100%">
<P>
You find pretty soon that anytime you work with ACE_Task<> you
have to create a derivative. The Task.h header simply provides
that derivative with the overrides we'll need in our application.
<P>
<HR WIDTH="100%"><PRE>
// $Id$
// Task.h
//
// Tutorial regarding a way to use ACE_Stream.
//
// written by bob mcwhirter (bob@netwrench.com)
//
//
#ifndef TASK_H
#define TASK_H
#include <ace/Task.h>
#include <ace/Synch.h>
// Always typedef when possible.
typedef ACE_Task<ACE_MT_SYNCH> Task_Base;
class Task : public Task_Base
{
public:
typedef Task_Base inherited;
// This is just good form.
Task(const char *nameOfTask,
int numberOfThreads);
// Initialize our Task with a name,
// and number of threads to spawn.
virtual ~Task(void);
virtual int open(void *arg);
// This is provided to prevent compiler complaints
// about hidden virtual functions.
virtual int close(u_long flags);
// This closes down the Task and all service threads.
virtual int put(ACE_Message_Block *message,
ACE_Time_Value *timeout);
// This is the interface that ACE_Stream uses to
// communicate with our Task.
virtual int svc(void);
// This is the actual service loop each of the service
// threads iterates through.
const char *nameOfTask(void) const;
// Returns the name of this Task.
private:
int d_numberOfThreads;
char d_nameOfTask[64];
ACE_Barrier d_barrier;
// Simple Barrier to make sure all of our service
// threads have entered their loop before accepting
// any messages.
};
#endif // TASK_H
</PRE>
<P><HR WIDTH="100%">
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