Difference between revisions of "Dining Philosopher with Threads Implementation in C/C++"

Revision as of 22:00, 13 December 2013

<syntaxhighlight lang="c"> //Dining philosopher using threads

include<stdio.h>
include<pthread.h>

void* reader(void*); pthread_mutex_t mut[5]; int n;

int main() {

 pthread_t t1[5];
 int i,j = 0,k;
 n = 5;
 for(i = 0; i < n; i++)
   {
     j=i;
     pthread_create(&t1[i], NULL, reader, &j);
   }
 for(j = 0; j < n; j++)
   pthread_join(t1[j], NULL);
 return 1;

}

void *reader(void* arg) {

 int val = *(int*)arg;
 printf("%d Thinking\n", val + 1);
 pthread_mutex_lock(&mut[val % n]);
 pthread_mutex_lock(&mut[(val + 1) % n]);
 printf("%d Eating\n", val + 1);
 sleep(3);
 pthread_mutex_unlock(&mut[val % n]);
 pthread_mutex_unlock(&mut[(val + 1) % n]);
 printf("%d Finished Eating\n",val + 1);

} </syntaxhighlight>

@@ Line 13: / Line 13: @@
 {
    pthread_t t1[5];
-   int i,j=0,k;
+   int i,j = 0,k;
    n = 5;
-   for(i=0;i<n;i++)
+   for(i = 0; i < n; i++)
      {
        j=i;
-       pthread_create(&t1[i],NULL,reader,&j);
+       pthread_create(&t1[i], NULL, reader, &j);
      }
-   for(j=0;j<n;j++)
+   for(j = 0; j < n; j++)
-     pthread_join(t1[j],NULL);
+     pthread_join(t1[j], NULL);
    return 1;
 }
@@ Line 27: / Line 27: @@
 void *reader(void* arg)
 {
-   int val=*(int*)arg;
+   int val = *(int*)arg;
-   printf("%d Thinking\n",val+1);
+   printf("%d Thinking\n", val + 1);
-   pthread_mutex_lock(&mut[val%n]);
+   pthread_mutex_lock(&mut[val % n]);
-   pthread_mutex_lock(&mut[(val+1)%n]);
+   pthread_mutex_lock(&mut[(val + 1) % n]);
-   printf("%d Eating\n",val+1);
+   printf("%d Eating\n", val + 1);
    sleep(3);
-   pthread_mutex_unlock(&mut[val%n]);
+   pthread_mutex_unlock(&mut[val % n]);
-   pthread_mutex_unlock(&mut[(val+1)%n]);
+   pthread_mutex_unlock(&mut[(val + 1) % n]);
-   printf("%d Finished Eating\n",val+1);
+   printf("%d Finished Eating\n",val + 1);
 }
 </syntaxhighlight>