Question

5. (26pts) Consider the following scenario: Process 0 is responsible for generating a random integer for the other processes to use. Each random number can be used by only one process. The random number can be passed to the other processes through an integer. The integer can be considered to be in one of two states. The integer is “empty” if Process 0 has not yet generated a random number or if the random number had been used by a processes. The integer is considered “full” if Process 0 stored a random number in it, and it has not yet been used by a process. Processes 1 - 10 will each use one random number.

Write psudocode for this scenario that uses:

(a) A monitor (b) Messages

Answer 1

Procedure CheckStatus  {
   Initialize integer x; //used for passing random value from process 0 to other process
   Initialize Process P0;    //used to generate random numbers and to pass these values to other processes
   Integer check;
   P0_random = rand();
   for each value of Pi:
         Pi = P0_random;
         if P0 did not generate any random value (or) Pi has already accepted the given integer:
               check = 'empty';
         else:
               check = 'full';

   end for
}

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