list8-2.cpp

这是c++编程方面的名著的例子代码

// Listing 8-1
// This program demonstrates the
// use of a lockable global variable Number updated by
// two threads

#include <iostream.h>
#include <pthread.h>
#include <mtration.h>
#include <math.h>

mt_rational *Number;

void *threadA(void *X)
{
    long int Q;
    try{
         for(Q =2; Q < 500;Q += 4)
         {   
             Number->assign((Q/2),Q);
             cout << pthread_self() << " Thread A: " << *Number << endl;
         }
    }
    catch(general_exception &M)
    {
      cout << pthread_self() << M.message() << endl;
    }                 
}

void *threadB(void *X)
{
   long int Y;
   try{
       for(Y = 5;Y < 500;Y += 5){
           Number->assign((Y/5),Y);
           cout << pthread_self() << " Thread B " << *Number << endl;
       }  
   }
   catch(general_exception &M){
         cout << pthread_self() << M.message() << endl;
   }
}


void main(void)
{
    pthread_t ThreadA;
    pthread_t ThreadB;
    try{
         Number = new mt_rational(1,1);
         pthread_create(&ThreadA,NULL,threadA,NULL);
         pthread_create(&ThreadB,NULL,threadB,NULL);       
         pthread_join(ThreadA,NULL);
         pthread_join(ThreadB,NULL);
         delete Number;
    }
    catch(general_exception &X)
    {
         cout << "From main( ) " << X.message() << endl;
    }
}