Sophie: libace5-doc-0:5.4-2mdk i586

libace5-doc-5.4-2mdk.i586.rpm

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   <TITLE>Example 1</TITLE>
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<FONT COLOR="#CC0000">/////////////////////////////////////////////////////////////////////////////////////////////////////////////////</FONT>
<BR><FONT COLOR="#CC0000">//// This example is from the ACE Programmers
Guide.</FONT>
<BR><FONT COLOR="#CC0000">////&nbsp; Chapter:&nbsp; "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">////&nbsp; 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">&lt;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>&nbsp;switch(signum){
<BR>&nbsp; case SIGWINCH:
<BR>&nbsp;&nbsp; ACE_DEBUG((LM_DEBUG, "You pressed SIGWINCH \n"));
<BR>&nbsp;&nbsp; break;

<P>&nbsp; case SIGINT:
<BR>&nbsp;&nbsp; ACE_DEBUG((LM_DEBUG, "You pressed SIGINT \n"));
<BR>&nbsp;&nbsp; break;
<BR>&nbsp;&nbsp; }
<BR>&nbsp;return 0;
<BR>&nbsp;}
<BR>};

<P>int main(int argc, char *argv[]){
<BR><FONT COLOR="#FF0000">&nbsp;//instantiate the handler</FONT>
<BR>&nbsp;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&nbsp;
(Singleton pattern)</FONT>

<P>&nbsp;ACE_Reactor::instance()->register_handler(SIGWINCH,eh);
<BR>&nbsp;ACE_Reactor::instance()->register_handler(SIGINT,eh);
<BR>&nbsp;while(1)
<BR>&nbsp;<FONT COLOR="#FF0000"> //Start the reactors event loop</FONT>
<BR>&nbsp; ACE_Reactor::instance()->handle_events();
<BR>}

<P>&nbsp;<A HREF="ex02.html">Next Example</A>
<BR>&nbsp;
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