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Program of Distributed Mutual Exclusion in C.

Hello Every one Today i gonna talk about the program of Distributed Mutual Exclusion in C.


Program of  Distributed Mutual Exclusion in C.

code : 

* Program with Mutual Exclusion :

#include <pthread.h>
#include <stdio.h>
int count = 0;
pthread_mutex_t thread_lock;
void* run_thread(){
            pthread_mutex_lock(&thread_lock);
            pthread_t thread_id = pthread_self();
            printf("Thread %u: Current value of count = %d\n", thread_id, count);
            printf("Thread %u incrementing count ...\n");
            count++;
            sleep(1);                           
            printf("Value of count after incremented by thread %u = %d\n", thread_id, count);
            pthread_mutex_unlock(&thread_lock);
            pthread_exit(NULL);
}
int main (int argc, char *argv[]){
            pthread_t thread_array[4];
            int i = 0, ret, thread_num = 4;
            for (i = 0; i < thread_num; i++){
                        if ((ret = pthread_create(&thread_array[i], NULL, run_thread, NULL)) == -1){
                                    printf("Thread creation failed with return code: %d", ret);
                                    exit(ret);
                        }
            }
            pthread_exit(NULL);
}

* Program without Mutual Exclusion .

#include <pthread.h>
#include <stdio.h>
int count = 0;
void* run_thread(){
            pthread_t thread_id = pthread_self();
            printf("Thread %u: Current value of count = %d\n", thread_id, count);
            printf("Thread %u incrementing count ...\n");
            count++;
            sleep(1);
            printf("Value of count after incremented by thread %u = %d\n", thread_id, count);
            pthread_exit(NULL);
}
int main (int argc, char *argv[]){
            pthread_t thread_array[4];
            int i = 0, ret, thread_num = 4;

            for (i = 0; i < thread_num; i++) {
               if ((ret = pthread_create(&thread_array[i], NULL, run_thread, NULL)) == -1) {
                          printf("Thread creation failed with return code: %d", ret);
                          exit(ret);
               }
            }
            pthread_exit(NULL);
}


* The OutPut of this Related Programs.


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