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  1. #include<stdio.h>
  2. #include<pthread.h>
  3. #include<semaphore.h>
  4.  
  5. sem_t mutex,writeblock;
  6. int data = 0,rcount = 0;
  7.  
  8. void *reader(void *arg)
  9. {
  10.   int f;
  11.   f = ((int)arg);
  12.   sem_wait(&mutex);
  13.   rcount = rcount + 1;
  14.   if(rcount==1)
  15.    sem_wait(&writeblock);
  16.   sem_post(&mutex);
  17.   printf("Data read by the reader%d is %d\n",f,data);
  18.   sleep(1);
  19.   sem_wait(&mutex);
  20.   rcount = rcount - 1;
  21.   if(rcount==0)
  22.    sem_post(&writeblock);
  23.   sem_post(&mutex);
  24. }
  25.  
  26. void *writer(void *arg)
  27. {
  28.   int f;
  29.   f = ((int) arg);
  30.   sem_wait(&writeblock);
  31.   data++;
  32.   printf("Data writen by the writer%d is %d\n",f,data);
  33.   sleep(1);
  34.   sem_post(&writeblock);
  35. }
  36.  
  37. int main()
  38. {
  39.   int i,b; 
  40.   pthread_t rtid[5],wtid[5];
  41.   sem_init(&mutex,0,1);
  42.   sem_init(&writeblock,0,1);
  43.   for(i=0;i<=2;i++)
  44.   {
  45.     pthread_create(&wtid[i],NULL,writer,(void *)i);
  46.     pthread_create(&rtid[i],NULL,reader,(void *)i);
  47.   }
  48.   for(i=0;i<=2;i++)
  49.   {
  50.     pthread_join(wtid[i],NULL);
  51.     pthread_join(rtid[i],NULL);
  52.   }
  53.   return 0;
  54. }
Success #stdin #stdout 0s 5304KB
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stdin
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Standard input is empty
stdout
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Data read by the reader2 is 0
Data read by the reader1 is 0
Data read by the reader0 is 0
Data writen by the writer2 is 1
Data writen by the writer1 is 2
Data writen by the writer0 is 3
https://ideone.com/tj7hOO
language:
C (gcc 8.3)
created:
15 days ago
visibility:
public

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