Implementation (Cont.)

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[ Questions or Comments ] Lecture 6: Slide 22 of 61

Implementation (Cont.)

Semaphore operations now defined as

 wait(S)
 { 
   S.value = S.value -1;
   if (S.value <0)
   {
     add this process to S.L;
     block;
   }
 }
 
 signal(S)
 { 
   S.value = S.value + 1;
   if (S.value <= 0)
   {
     remove a process P from S.L;
     wakeup(P); 
   }
 }

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