<HTML> <!-- ex06.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 6</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 6</FONT> <BR><FONT COLOR="#000099">#include</FONT> <FONT COLOR="#006600">"ace/Thread.h"</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_T.h"</FONT> <BR><FONT COLOR="#000099">#include</FONT><FONT COLOR="#006600"> "ace/Synch.h"</FONT> <P>static int number=0; <BR>static int seed=0; <P>class Args{ <BR>public: <BR>Args(ACE_Condition<ACE_Thread_Mutex> *cond, int threads): <BR> cond_(cond), threads_(threads){} <BR>ACE_Condition<ACE_Thread_Mutex> *cond_; <BR>int threads_; <BR>}; <P>static void* <BR>worker(void *arguments){ <BR> Args *arg= (Args*)arguments; <BR> ACE_DEBUG((LM_DEBUG,"Thread (%t) Created to do some work\n")); <BR> ::number++; <BR><FONT COLOR="#FF0000"> //Work</FONT> <BR> ACE_OS::sleep(ACE_OS::rand()%2); <P><FONT COLOR="#FF0000"> //Exiting now</FONT> <BR> ACE_DEBUG((LM_DEBUG, <BR> "\tThread (%t) Done! \n\tThe number is now: %d\n",number)); <BR><FONT COLOR="#FF0000"> //If all threads are done signal main thread that program can now exit</FONT> <BR> if(number==arg->threads_){ <BR> ACE_DEBUG((LM_DEBUG, <BR> "(%t) Last Thread!\n All threads have done their job! <BR> Signal main thread\n")); <BR> arg->cond_->signal(); <BR> } <BR>return 0; <BR>} <BR> <P>int main(int argc, char *argv[]){ <BR>if(argc<2){ <BR> ACE_DEBUG((LM_DEBUG,"Usage: <program_name> <number of threads>\n")); <BR> ACE_OS::exit(1); <BR> } <BR> <BR>int n_threads=ACE_OS::atoi(argv[1]); <P><FONT COLOR="#FF0000">//Setup the random number generator</FONT> <BR>ACE_OS::srand(::seed); <P><FONT COLOR="#FF0000">//Setup arguments for threads</FONT> <BR>ACE_Thread_Mutex mutex; <BR>ACE_Condition<ACE_Thread_Mutex> cond(mutex); <BR>Args arg(&cond,n_threads); <P><FONT COLOR="#FF0000">//Spawn off n_threads number of threads</FONT> <BR>for(int i=0; i<n_threads; i++){ <BR> if(ACE_Thread::spawn((ACE_THR_FUNC)worker,(void*)&arg, <BR> THR_DETACHED|THR_NEW_LWP)==-1) <BR> ACE_DEBUG((LM_DEBUG,"Error in spawning thread\n")); <BR> } <P><FONT COLOR="#FF0000">//Wait for signal indicating that all threads are done and program can exit</FONT> <BR>mutex.acquire(); <BR>if(number!=n_threads) <BR> cond.wait(); <BR>ACE_DEBUG((LM_DEBUG,"(%t) Main Thread got signal. Program exiting..\n")); <BR>mutex.release(); <BR>ACE_OS::exit(0); <BR>} <P> <A HREF="ex07.html">Next Example</A> </BODY> </HTML>