<HTML> <!-- ex03.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 3</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: "Thread 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="#CC0000">//Example 3</FONT> <BR><FONT COLOR="#000099">#include</FONT> <FONT COLOR="#006600">"ace/OS.h"</FONT> <BR><FONT COLOR="#000099">#include</FONT> <FONT COLOR="#006600">"ace/Synch.h"</FONT> <BR><FONT COLOR="#000099">#include</FONT> <FONT COLOR="#006600">"ace/Synch_T.h"</FONT> <P><FONT COLOR="#FF0000">//Arguments that are to be passed to the worker thread are passed through this class.</FONT> <BR>class Args{ <BR>public: <BR>Args(ACE_Lock* lock,int iterations): <BR> mutex_(lock),iterations_(iterations){} <BR>ACE_Lock* mutex_; <BR>int iterations_; <BR>}; <P><FONT COLOR="#FF0000">//The starting point for the worker threads</FONT> <BR>static void* <BR>worker(void*arguments){ <BR>Args *arg= (Args*) arguments; <BR>for(int i=0;i<arg->iterations_;i++){ <BR> ACE_DEBUG((LM_DEBUG, <BR> "(%t) Trying to get a hold of this iteration\n")); <BR><FONT COLOR="#FF0000"> //This is our critical section</FONT> <BR> arg->mutex_->acquire(); <BR> ACE_DEBUG((LM_DEBUG,"(%t) This is iteration number %d\n",i)); <BR><FONT COLOR="#FF0000"> //work</FONT> <BR> ACE_OS::sleep(2); <BR> arg->mutex_->release(); <BR> } <BR>return 0; <BR>} <P>int main(int argc, char*argv[]){ <BR>if(argc<4){ <BR> ACE_OS::printf("Usage: egx <number_of_threads> <BR> <number_of_iterations> <lock_type>\n"); <BR> ACE_OS::exit(1); <BR> } <BR><FONT COLOR="#FF0000">//Lock used by application</FONT> <BR>ACE_Lock *lock; <P><FONT COLOR="#FF0000">//Decide which lock you want to use at run time. Possible due to</FONT> <BR><FONT COLOR="#FF0000">//ACE_Lock.</FONT> <BR>if(ACE_OS::strcmp(argv[3],"Thread")) <BR> lock=new ACE_Lock_Adapter<ACE_Thread_Mutex>; <BR>else <BR> lock=new ACE_Lock_Adapter<ACE_Mutex> <P><FONT COLOR="#FF0000">//Setup the arguments</FONT> <BR>Args arg(lock,ACE_OS::atoi(argv[2])); <BR><FONT COLOR="#FF0000">//Spawn the worker threads</FONT> <BR>ACE_Thread::spawn_n <BR> (ACE_OS::atoi(argv[1]),(ACE_THR_FUNC)worker,(void*)&arg); <BR>while(ACE_Thread::join(NULL,NULL,NULL)==0); <BR>} <P> <A HREF="ex04.html">Next Example</A> </BODY> </HTML>