<HTML> <!-- ex01.html,v 1.2 2000/06/04 22:02:08 brunsch Exp --> <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> </HEAD> <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> </BODY> </HTML>