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<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<META NAME="Author" CONTENT="Ambreen Ilyas">
<META NAME="GENERATOR" CONTENT="Mozilla/4.05 [en] (X11; I; SunOS 5.5.1 sun4u) [Netscape]">
<TITLE>Example 1</TITLE>
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<BODY>
<FONT COLOR="#CC0000">/////////////////////////////////////////////////////////////////////////////////////////////////////////////////</FONT>
<BR><FONT COLOR="#CC0000">//// This example is from the ACE Programmers
Guide.</FONT>
<BR><FONT COLOR="#CC0000">//// Chapter: "The Reactor" (Event
Management)</FONT>
<BR><FONT COLOR="#CC0000">//// For details please see the guide at</FONT>
<BR><FONT COLOR="#CC0000">//// http://www.cs.wustl.edu/~schmidt/ACE.html</FONT>
<BR><FONT COLOR="#CC0000">//// AUTHOR: Umar Syyid (usyyid@hns.com)</FONT>
<BR><FONT COLOR="#CC0000">//// and Ambreen Ilyas (ambreen@bitsmart.com)</FONT>
<BR><FONT COLOR="#CC0000">/////////////////////////////////////////////////////////////////////////////////////////////////////////////</FONT>
<P><FONT COLOR="#FF0000">//Example 1</FONT>
<BR><FONT COLOR="#000099">#include</FONT> <FONT COLOR="#006600"><signal.h></FONT>
<BR><FONT COLOR="#000099">#include</FONT> <FONT COLOR="#006600">"ace/Reactor.h"</FONT>
<BR><FONT COLOR="#000099">#include</FONT> <FONT COLOR="#006600">"ace/Event_Handler.h"</FONT>
<P><FONT COLOR="#FF0000">//Create our subclass to handle the signal events</FONT>
<BR><FONT COLOR="#FF0000">//that we wish to handle. Since we know that
this particular</FONT>
<BR><FONT COLOR="#FF0000">//event handler is going to be using signals
we only overload the</FONT>
<BR><FONT COLOR="#FF0000">//handle_signal method.</FONT>
<P>class
<BR>MyEventHandler: public ACE_Event_Handler{
<BR>int
<BR>handle_signal(int signum, siginfo_t*,ucontext_t*){
<BR> switch(signum){
<BR> case SIGWINCH:
<BR> ACE_DEBUG((LM_DEBUG, "You pressed SIGWINCH \n"));
<BR> break;
<P> case SIGINT:
<BR> ACE_DEBUG((LM_DEBUG, "You pressed SIGINT \n"));
<BR> break;
<BR> }
<BR> return 0;
<BR> }
<BR>};
<P>int main(int argc, char *argv[]){
<BR><FONT COLOR="#FF0000"> //instantiate the handler</FONT>
<BR> MyEventHandler *eh =new MyEventHandler;
<P><FONT COLOR="#FF0000">//Register the handler asking to call back when
either SIGWINCH</FONT>
<BR><FONT COLOR="#FF0000">//or SIGINT signals occur. Note that in both
the cases we asked the</FONT>
<BR><FONT COLOR="#FF0000">//Reactor to call back the same Event_Handler
i.e., MyEventHandler.</FONT>
<BR><FONT COLOR="#FF0000">//This is the reason why we had to write a switch
statement in the handle_signal()</FONT>
<BR><FONT COLOR="#FF0000">//method above. Also note that the</FONT>
<BR><FONT COLOR="#FF0000">//ACE_Reactor is being used as a Singleton object
(Singleton pattern)</FONT>
<P> ACE_Reactor::instance()->register_handler(SIGWINCH,eh);
<BR> ACE_Reactor::instance()->register_handler(SIGINT,eh);
<BR> while(1)
<BR> <FONT COLOR="#FF0000"> //Start the reactors event loop</FONT>
<BR> ACE_Reactor::instance()->handle_events();
<BR>}
<P> <A HREF="ex02.html">Next Example</A>
<BR>
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