list8-2.txt

这是c++编程方面的名著的例子代码

    1   // Listing 8-2
    2   // This program demonstrates the
    3   // use of a lockable global variable Number updated by
    4   // two threads
    5   
    6   #include <iostream.h>
    7   #include <pthread.h>
    8   #include <mtration.h>
    9   #include <math.h>
   10   
   11   mt_rational *Number;
   12   
   13   void *threadA(void *X)
   14   {
   15       long int Q;
   16       try{
   17            for(Q =2; Q < 500;Q += 4)
   18            {   
   19                Number->assign((Q/2),Q);
   20                cout << pthread_self() << " Thread A: " << *Number << endl;
   21            }
   22       }
   23       catch(general_exception &M)
   24       {
   25         cout << pthread_self() << M.message() << endl;
   26       }                 
   27   }
   28   
   29   void *threadB(void *X)
   30   {
   31      long int Y;
   32      try{
   33          for(Y = 5;Y < 500;Y += 5){
   34              Number->assign((Y/5),Y);
   35              cout << pthread_self() << " Thread B " << *Number << endl;
   36          }  
   37      }
   38      catch(general_exception &M){
   39            cout << pthread_self() << M.message() << endl;
   40      }
   41   }
   42   
   43   
   44   void main(void)
   45   {
   46       pthread_t ThreadA;
   47       pthread_t ThreadB;
   48       try{
   49            Number = new mt_rational(1,1);
   50            pthread_create(&ThreadA,NULL,threadA,NULL);
   51            pthread_create(&ThreadB,NULL,threadB,NULL);       
   52            pthread_join(ThreadA,NULL);
   53            pthread_join(ThreadB,NULL);
   54            delete Number;
   55       }
   56       catch(general_exception &X)
   57       {
   58            cout << "From main( ) " << X.message() << endl;
   59       }
   60   }     
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