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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 013</TITLE>
-</HEAD>
-<BODY TEXT="#000000" BGCOLOR="#FFFFFF" LINK="#000FFF" VLINK="#FF0F0F">
-
-<CENTER><B><FONT SIZE=+2>ACE Tutorial 013</FONT></B></CENTER>
-
-<CENTER><B><FONT SIZE=+2>Multiple thread pools</FONT></B></CENTER>
-
-
-<P>
-<HR WIDTH="100%">
-<P>
-We'll go back to our tradition of looking at main() first. The only
-change here from our "normal" thread pool is the ability to specify
-the number of subtasks for the pool. (Each subtask is another thread
-pool in the chain. I suppose I should have named that better...)
-I've still got the custom Message_Block so that, at this level, we
-don't even know about custom Data_Blocks.
-<P>
-<HR WIDTH="100%">
-<PRE>
-#include "mld.h"
-#include "task.h"
-#include "work.h"
-#include "block.h"
-
-int run_test (int iterations, int threads, int subtasks)
-{
- // Create a task with some subtasks. Each Task is a thread
- // pool of 'threads' size. If a task has a subtask, it will
- // forward the unit of work to the subtask when finished. See
- // task.{h|cpp} for more details.
- Task * task = new Task(subtasks);
-
- if (task->open (threads) == -1)
- {
- ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "open"), -1);
- }
-
- // Give the threads a chance to get ready.
- ACE_OS::sleep (ACE_Time_Value (1));
-
- for (int i = 0; i < iterations; ++i)
- {
- // Create a custom message block that can contain our Work object
- Message_Block *message = new Message_Block( new Work(i) );
-
- // Put the "unit of work" into the message queue
- if (task->putq (message) == -1)
- {
- ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "putq"), -1);
- }
- }
-
- // The default constructor of our custom message block will
- // insert a message telling our task to shutdown.
- Message_Block *message = new Message_Block( );
-
- // Put the shutdown request into the thread pool
- if (task->putq (message) == -1)
- {
- ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "putq"), -1);
- }
-
- // Wait for the task to shut down. Any subtasks will also be
- // waited for.
- task->wait ();
-
- // Delete our Task to prevent a memory leak
- delete task;
-
- // Ask our memory leak detector if things are OK
- if( MLD_COUNTER->value() != 0 )
- {
- ACE_DEBUG ((LM_DEBUG, "(%P|%t) Memory Leak!\n"));
- }
-
- return (0);
-}
-
-int main (int argc, char *argv[])
-{
- // Number of Work objects to put into the Task pool
- int iterations = argc > 1 ? atoi (argv[1]) : 4;
- // Number of threads for each Task
- int threads = argc > 2 ? atoi (argv[2]) : 2;
- // Number of tasks to chain after the primary task
- int subtasks = argc > 3 ? atoi(argv[3]) : 1;
-
- (void) run_test (iterations, threads, subtasks);
-
- ACE_DEBUG ((LM_DEBUG, "(%P|%t) Application exiting\n"));
-
- exit (0);
-}
-</PRE>
-<HR WIDTH="100%">
-<P>
-Nothing really surprising here... Just remember that your total
-number of threads is ( ( 1 + subtasks ) * threads ). You probably
-don't want to get too carried away with that!
-<P>
-<HR WIDTH="100%">
-<CENTER>[<A HREF="..">Tutorial Index</A>] [<A HREF="page03.html">Continue
-This Tutorial</A>]</CENTER>
-
-</BODY>
-</HTML>