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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>
<font color=red>// $Id$</font>
<font color=red>// Task.h</font>
<font color=red>//</font>
<font color=red>// Tutorial regarding a way to use ACE_Stream.</font>
<font color=red>//</font>
<font color=red>// written by bob mcwhirter (bob@netwrench.com)</font>
<font color=red>//</font>
<font color=red>//</font>
<font color=blue>#ifndef</font> <font color=purple>TASK_H</font>
<font color=blue>#define</font> <font color=purple>TASK_H</font>
<font color=blue>#include</font> <ace/Task.h>
<font color=blue>#include</font> <ace/Synch.h>
<font color=red>// Always typedef when possible.</font>
typedef ACE_Task<ACE_MT_SYNCH> Task_Base;
class Task : public Task_Base
{
public:
typedef Task_Base inherited;
<font color=red>// This is just good form.</font>
Task(const char *nameOfTask,
int numberOfThreads);
<font color=red>// Initialize our Task with a name,</font>
<font color=red>// and number of threads to spawn.</font>
virtual ~Task(void);
virtual int open(void *arg);
<font color=red>// This is provided to prevent compiler complaints</font>
<font color=red>// about hidden virtual functions.</font>
virtual int close(u_long flags);
<font color=red>// This closes down the Task and all service threads.</font>
virtual int put(ACE_Message_Block *message,
ACE_Time_Value *timeout);
<font color=red>// This is the interface that ACE_Stream uses to</font>
<font color=red>// communicate with our Task.</font>
virtual int svc(void);
<font color=red>// This is the actual service loop each of the service</font>
<font color=red>// threads iterates through.</font>
const char *nameOfTask(void) const;
<font color=red>// Returns the name of this Task.</font>
private:
int d_numberOfThreads;
char d_nameOfTask[64];
ACE_Barrier d_barrier;
<font color=red>// Simple Barrier to make sure all of our service</font>
<font color=red>// threads have entered their loop before accepting</font>
<font color=red>// any messages.</font>
};
<font color=blue>#endif</font> <font color=red>// TASK_H</font>
</PRE>
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