PROGRAM TO UNDERSTAND PRODUCER CONSUMER PROBLEM

-

 #include <stdio.h>

#include <stdlib.h>


// Initializing the mutex variable with the value 1.

int mutex = 1;


// Initializing the full variable with the value 0.

int full = 0;


// empty variable will store the number of empty slots in the buffer.

int empty = 10, data = 0;


// A function that will resemble producers' production of data

void producer()

{

    // decrementing the value of mutex

    --mutex;


    // Increase the number of full slots

    ++full;


    // decrementing the number of slots available

    --empty;


    // incrementing data which means that the data is produced.

    data++;


    printf("\nProducer produces item number: %d\n", data);


    // incrementing the value of mutex

    ++mutex;

}


// A function that will resemble the consumer's consumption of data

void consumer()

{

    // decrementing the value of mutex

    --mutex;


    // Decrease the number of full slots

    --full;


    // incrementing the number of slots available

    ++empty;


    printf("\nConsumer consumes item number: %d.\n", data);


    // since data is consumed, let us decrease the value of data

    data--;


    // incrementing the value of mutex

    ++mutex;

}


int main()

{

    int n, i;

    printf("\n1. Enter 1 for Producer"

           "\n2. Enter 2 for Consumer"

           "\n3. Enter 3 to Exit");


    for (i = 1; i > 0; i++)

    {

        printf("\nEnter your choice: ");

        scanf("%d", &n);


        // using switch case as there can be multiple types of choice.

        switch (n)

        {

        case 1:

            /*

            If the value of mutex is 1 and the buffer is not full, then we can produce the data

            */

            if ((mutex == 1) && (empty != 0))

            {

                producer();

            }


            // else, the buffer must be full.

            else

            {

                printf("The Buffer is full. New data cannot be produced!");

            }

            break;


        case 2:

            /*

            If the value of mutex is 1 and the buffer is not empty, then we can consume the data

            */

            if ((mutex == 1) && (full != 0))

            {

                consumer();

            }


            // else, the buffer must be empty.

            else

            {

                printf("The Buffer is empty! New data cannot be consumed!");

            }

            break;


        // Exit Condition

        case 3:

            exit(0);

            break;

        }

    }

}

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