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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 012</TITLE>
</HEAD>
<BODY TEXT="#000000" BGCOLOR="#FFFFFF" LINK="#000FFF" VLINK="#FF0F0F">
<CENTER><B><FONT SIZE=+2>ACE Tutorial 012</FONT></B></CENTER>
<CENTER><B><FONT SIZE=+2>Passing classes through ACE_Message_Queue</FONT></B></CENTER>
<P>
<HR WIDTH="100%">
<P>
Ok, finally we get to main(). Sorry for the diversion but it was
important to lay some of that groundwork before getting here.
<P>
<HR WIDTH="100%">
<PRE>
/*
I want to be sure that our Task object gets destructed correctly, so
I'll do most of the application 'work' in run_test() instead of
main()
*/
int run_test (int iterations, int threads)
{
/*
Create the Task which is our thread pool for doing work
*/
Task task;
if (task.open (threads) == -1)
{
ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "open"), -1);
}
/*
Give the Task a chance to enter it's svc() method. This isn't
really necessary and you probably wouldn't do it in a real
application but it makes the output more interesting.
*/
ACE_OS::sleep (ACE_Time_Value (1));
for (int i = 0; i < iterations; ++i)
{
/*
Construct a Work object that we'll put into the Queue. Give it
the iteration number so that it can identify itself in the output.
*/
Work * data = new Work(i);
/*
Create a block that contains our Work object but also has
enough room for a text message.
*/
Message_Block *message = new Message_Block (128, data);
/*
As before, put a text message into the block.
*/
ACE_OS::sprintf (message->wr_ptr (), "This is message %d.", i);
message->wr_ptr (strlen (message->rd_ptr ())+1);
/*
Add the work to our thread pool
*/
if (task.putq (message) == -1)
{
break;
}
}
/*
Insert a HANGUP message block to tell the thread pool to shut
itself down.
*/
Message_Block *message = new Message_Block (0,0);
message->msg_type (ACE_Message_Block::MB_HANGUP);
task.putq (message);
/*
Wait for the all threads of the Task to exit. It is rather rude
to let the Task go out of scope without doing this first.
*/
task.wait ();
return (0);
}
int main (int argc, char *argv[])
{
/*
Give the user a chance to override the default number of
iterations and pool threads.
*/
int iterations = argc > 1 ? atoi (argv[1]) : 4;
int threads = argc > 2 ? atoi (argv[2]) : 2;
/*
Use the function above to do the actual test. As I said, this
lets us see the Task go out of scope and destruct before our
"exiting" message below.
*/
(void) run_test (iterations, threads);
ACE_DEBUG ((LM_DEBUG, "(%P|%t) Application exiting\n"));
exit (0);
}
</PRE>
<HR WIDTH="100%">
<P>
That certainly looks cleaner than the previous approach! If you
blink, you'll miss the part where the Work object goes into the Queue.
<P>
<HR WIDTH="100%">
<P>
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