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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