<!-- page05.html,v 1.10 2000/03/19 20:09:27 jcej Exp -->
<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>
On this page we have the code for the Data_Block and Message_Block
objects. As you probably suspect from the header on the previous
page, the complicated part is in the construction and destruction of
the Data_Block.
<P>
<HR WIDTH="100%">
<PRE>
<font color=red>// page05.html,v 1.10 2000/03/19 20:09:27 jcej Exp</font>
<font color=blue>#include</font> "<font color=green>block.h</font>"
<font color=red>/*
Construct a Dat_Block to contain a unit of work. Note the careful
construction of the baseclass to set the block type and the locking
strategy.
*/</font>
<font color=#008888>Data_Block::Data_Block</font> (Unit_Of_Work * _data)
: ACE_Data_Block (0, <font color=#008888>ACE_Message_Block::MB_DATA</font>, 0, 0, new Lock (), 0, 0)
,data_ (_data)
{
ACE_DEBUG ((LM_DEBUG, "<font color=green>(%P|%t) 0x%x Data_Block ctor for 0x%x\n</font>", (void *) this, (void *) data_));
}
<font color=red>/*
The Lock object created in the constructor is stored in the baseclass and
available through the locking_strategy() method. We can cast it's value to
our Lock object and invoke the destroy() to indicate that we want it to go
away when the lock is released.
*/</font>
<font color=#008888>Data_Block::~Data_Block</font> (void)
{
ACE_DEBUG ((LM_DEBUG, "<font color=green>(%P|%t) 0x%x Data_Block dtor for 0x%x\n</font>", (void *) this, (void *) data_));
((Lock *) locking_strategy ())->destroy ();
delete data_;
}
<font color=red>/*
Return the data
*/</font>
Unit_Of_Work *<font color=#008888>Data_Block::data</font> (void)
{
return this->data_;
}
Data_Block:: <font color=#008888>Lock::Lock</font> (void)
{
ACE_DEBUG ((LM_DEBUG, "<font color=green>(%P|%t) 0x%x Lock ctor\n</font>", (void *) this));
}
Data_Block:: <font color=#008888>Lock::~Lock</font> (void)
{
ACE_DEBUG ((LM_DEBUG, "<font color=green>(%P|%t) 0x%x Lock dtor\n</font>", (void *) this));
}
<font color=red>/*
Delete ourselves to prevent any memory leak
*/</font>
int <font color=#008888>Data_Block::Lock</font>::destroy (void)
{
delete this;
return (0);
}
<font color=red>/*
Create an baseclass unit of work when we instantiate a hangup message.
*/</font>
<font color=#008888>Message_Block::Message_Block</font> (void)
:ACE_Message_Block (new Data_Block (new Unit_Of_Work ()))
{
ACE_DEBUG ((LM_DEBUG, "<font color=green>(%P|%t) 0x%x Message_Block ctor for shutdown\n</font>", (void *) this));
this->msg_type (MB_HANGUP);
}
<font color=red>/*
Store the unit of work in a Data_Block and initialize the baseclass with
that data.
*/</font>
<font color=#008888>Message_Block::Message_Block</font> (Unit_Of_Work * _data)
:ACE_Message_Block (new Data_Block (_data))
{
ACE_DEBUG ((LM_DEBUG, "<font color=green>(%P|%t) 0x%x Message_Block ctor for 0x%x\n</font>", (void *) this, (void *) _data));
}
<font color=#008888>Message_Block::~Message_Block</font> (void)
{
ACE_DEBUG ((LM_DEBUG, "<font color=green>(%P|%t) 0x%x Message_Block dtor\n</font>", (void *) this));
}
</PRE>
<P><HR WIDTH="100%">
<CENTER>[<A HREF="../online-tutorials.html">Tutorial Index</A>] [<A HREF="page06.html">Continue This Tutorial</A>]</CENTER>
