prints five subsequent lines of letter A on the printer and keeps looping (about 10 times).

INSTRUCTIONS TO CANDIDATES

ANSWER ALL QUESTIONS

C++, Full Assignment description is attached as a file.

Simulate the concurrent execution of two threads using a single program:

Thread A: prints five subsequent lines of letter A on the printer and keeps looping (about 10 times).

Thread B: prints five subsequent lines of letter B on the printer and keeps looping

 

 

// This producer and consumer program is to show you how to create threads and use related system calls.

// Your homework will be a different program.

 

#include <stdio.h>

#include <pthread.h>

 

#define TIMES 10

#define CAPACITY 3

#define ITEMSIZE 20

 

struct Buffer

{

  int item[ITEMSIZE];

  int size;

};

 

void *producer();

void *consumer();

 

pthread_mutex_t mutex;

pthread_cond_t  full_cond;

pthread_cond_t  empty_cond;

struct Buffer buffer;

 

int

main()

{ int i;

  pthread_t tid;

 

  for (i =0; i< ITEMSIZE; i++) buffer.item[i]=-1;

  buffer.size = 0;

 

  pthread_setconcurrency(2);

 

  pthread_create(&tid, NULL, (void *(*)(void *))producer, NULL  );

  pthread_create(&tid, NULL, (void *(*)(void *))consumer, NULL );

 

 

 pthread_exit(0);

 

}

 

void *producer()

{ int i,j;

 

 for (j = 0; j<TIMES; j++)

 {pthread_mutex_lock(&mutex);  

 if (buffer.size == CAPACITY)

    {printf("Buffer is full. Producer is waiting...\n");

     pthread_cond_wait(&full_cond, &mutex);

    }

 else

    {

     printf("Producer adds one more item ...\n");

     buffer.item[buffer.size++] = buffer.size;

     for (i =0;i<buffer.size; i++)

     printf("%d ", buffer.item[i]);

     printf("\n");

     pthread_cond_broadcast(&empty_cond);

     

    }

  pthread_mutex_unlock(&mutex);

}

}

 

void *consumer()

{ int i,j;

 

for (j=0; j<TIMES; j++)

{

  pthread_mutex_lock(&mutex);

 

  if (buffer.size == 0)

    {

      printf("Buffer is empty. Consumer is waiting...\n");

      pthread_cond_wait(&empty_cond, &mutex);

    }

  else

    {

      printf("Consumer consumes an item from buffer...\n");

      buffer.size--;

      for (i=0; i<buffer.size; i++)

      printf("%d ", buffer.item[i]);

      printf("\n");

      pthread_cond_broadcast(&full_cond);

    }

 

   pthread_mutex_unlock(&mutex);

 }

 

}

 

 

 

 

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