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operating system

  Asked By: Hemez    Date: May 10    Category: C Programming    Views: 1352
  

/* buffer.h */
typedef int buffer_item;
#define BUFFER_SIZE 5

/* main.c */

#include <stdlib.h>
#include <stdio.h>
#include <pthread.h>
#include <semaphore.h>
#include "buffer.h"

#define RAND_DIVISOR 100000000
#define TRUE 1

/* The mutex lock */
pthread_mutex_t mutex;

/* the semaphores */
sem_t full, empty;

/* the buffer */
buffer_item buffer[BUFFER_SIZE];

/* buffer counter */
int counter;

pthread_t tid; //Thread ID
pthread_attr_t attr; //Set of thread attributes

void *producer(void *param); /* the producer thread */
void *consumer(void *param); /* the consumer thread */

void initializeData() {

/* Create the mutex lock */
pthread_mutex_init(&mutex, NULL);

/* Create the full semaphore and initialize to 0 */
sem_init(&full, 0, 0);

/* Create the empty semaphore and initialize to BUFFER_SIZE */
sem_init(&empty, 0, BUFFER_SIZE);

/* Get the default attributes */
pthread_attr_init(&attr);

/* init buffer */
counter = 0;
}

/* Producer Thread */
void *producer(void *param) {
buffer_item item;

while(TRUE) {
/* sleep for a random period of time */
int rNum = rand() / RAND_DIVISOR;
sleep(rNum);

/* generate a random number */
item = rand();

/* acquire the empty lock */
sem_wait(&empty);
/* acquire the mutex lock */
pthread_mutex_lock(&mutex);

if(insert_item(item)) {
fprintf(stderr, " Producer report error condition\n");
}
else {
printf("producer produced %d\n", item);
}
/* release the mutex lock */
pthread_mutex_unlock(&mutex);
/* signal full */
sem_post(&full);
}
}

/* Consumer Thread */
void *consumer(void *param) {
buffer_item item;

while(TRUE) {
/* sleep for a random period of time */
int rNum = rand() / RAND_DIVISOR;
sleep(rNum);

/* aquire the full lock */
sem_wait(&full);
/* aquire the mutex lock */
pthread_mutex_lock(&mutex);
if(remove_item(&item)) {
fprintf(stderr, "Consumer report error condition\n");
}
else {
printf("consumer consumed %d\n", item);
}
/* release the mutex lock */
pthread_mutex_unlock(&mutex);
/* signal empty */
sem_post(&empty);
}
}

/* Add an item to the buffer */
int insert_item(buffer_item item) {
/* When the buffer is not full add the item
and increment the counter*/
if(counter < BUFFER_SIZE) {
buffer[counter] = item;
counter=(counter+1)%BUFFER_SIZE;//1-add this becouse sub from size buffer
counter++;
return 0;
}
else { /* Error the buffer is full */
return -1;
}
}

/* Remove an item from the buffer */
int remove_item(buffer_item *item) {
/* When the buffer is not empty remove the item
and decrement the counter */
if(counter > 0) {
*item = buffer[(counter)];
counter=(counter+1)%BUFFER_SIZE;//2-add this becouse sub from size buffer
counter--;
return 0;
}
else { /* Error buffer empty */
return -1;
}
}

int main(int argc, char *argv[]) {
/* Loop counter */
int i;

/* Verify the correct number of arguments were passed in */
if(argc != 4) {
fprintf(stderr, "USAGE:./main.out <INT> <INT> <INT>\n");
}

int mainSleepTime = atoi(argv[1]); /* Time in seconds for main to sleep */
int numProd = atoi(argv[2]); /* Number of producer threads */
int numCons = atoi(argv[3]); /* Number of consumer threads */

/* Initialize the app */
initializeData();

/* Create the producer threads */
for(i = 0; i < numProd; i++) {
/* Create the thread */
pthread_create(&tid,&attr,producer,NULL);
}

/* Create the consumer threads */
for(i = 0; i < numCons; i++) {
/* Create the thread */
pthread_create(&tid,&attr,consumer,NULL);
}

/* Sleep for the specified amount of time in milliseconds */
sleep(mainSleepTime);

/* Exit the program */
printf("Exit the program\n");
exit(0);
}
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