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Lecture 6: Slide 28 of 61

Implementing S (Cont.)
  • wait operation

     wait( S1 );
     C = C - 1;
     if (C<0)
     { 
       signal( S1 );
       wait( S2 );
     }
     else
       signal( S1 );
  • signal operation

     wait( S1 );
     C = C+1;
     if (C <= 0)
       signal( S2 );
     signal( S1 );

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