how to multithread using c++

iceman <>
Mon, 11 Feb 2008 18:42:43 -0800 (PST)
I need to implement a timer associated with a state[in a state
machine].In case the statemachine does not get any input for a
particular period of time, the timer should reset and there should be
default action.
How do I implement multiple threads in c++[in linux].

I got this example on the web .its uses 2 threads.but it does not
execute together.
thread 1 executes then thread 2

void *task1(void *X);
void *task2(void *X);

int main(int argc, char *argv[])
   pthread_t ThreadA,ThreadB;
   int N;

   if(argc != 2){
      std::cout << "error" <<"\n";
      exit (1);

   N = atoi(argv[1]);
   std::cout << "waiting for threads to join" <<"\n";

void *task1(void *X)
   int *Temp;
   Temp = static_cast<int *>(X);

   for(int Count = 1;Count < *Temp;Count++){
       std::cout << "work from thread A: " << Count << " * 2 = "
            << Count * 2 <<"\n";
   std::cout << "Thread A complete" <<"\n";

void *task2(void *X)
   int *Temp;
   Temp = static_cast<int *>(X);

   for(int Count = 1;Count < *Temp;Count++){
       std::cout << "work from thread B: " << Count << " + 2 = "
            << Count + 2 <<"\n";
   std::cout << "Thread B complete" << "\n";


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