BoundedBuffer (Cont.)

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[ Questions or Comments ] Lecture 6: Slide 4 of 61

BoundedBuffer (Cont.)

Consumer process

 do      
 {
   /*Test Counter*/
   while (counter==0)
   {
     /*do nothing*/
   }
 
   /*Take Item From Buffer*/ 
   nextc = buffer[out]; 
 
   /*Increment Pointer*/ 
   out = (out+1)%n; 
 
   /*Decrement Counter*/
   counter = counter - 1;
                          
   /*Consume Item*/ 
   cout << nextc ; 
 } while (true)

The statements:
- counter = counter +1;
- counter = counter 1; must be executed atomically.

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