Consider the producer-consumer problem where the producer produces items to be consumed by the consumer. A solution of t

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Consider the producer-consumer problem where the producer
produces items to be consumed by the consumer. A solution of the
problem is to be implemented using threads. The main process will
run producer and consumer as two different threads. The producer
will put the items it generates into a buffer of length 15. The
consumer reads the elements of the buffer to get the items. A
solution is given below. Each item produced and consumed are also
printed to the screen. Run the program several times and find a
sample run when the items produced are not correctly consumed.
Explain why the program does not always work correctly.
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
int buffer[15] = {0};
int in =0, out = 0;
void *Producer()//
{
int nextp;
for(int i=0;i<15;i++){
//produce an item
nextp = 2*3+i;
buffer[in] = nextp;
printf("The producer produced the
item = %d\n",nextp);
in = (in+1);
}
}
void *Consumer()//
{
int nextc;
for(int i=0;i<15;i++){
nextc = buffer[out];
printf("The consumer consumed the
item = %d\n",nextc);
out = (out+1);
}
}
void main()
{
pthread_t thread1;
pthread_t thread2;
pthread_create(&thread1, NULL,
Producer, NULL);
pthread_create(&thread2, NULL,
Consumer, NULL);
pthread_join(thread1,NULL);
pthread_join(thread2,NULL);
exit(0);
}