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  1. #include <stdio.h>
  2. #include <pthread.h>
  3. #include <semaphore.h>
  4.  
  5. sem_t odd_sem, even_sem;
  6. int limit;
  7.  
  8. void* print_odd(void* arg)
  9. {
  10.     for(int i = 1; i <= limit; i += 2)
  11.     {
  12.         sem_wait(&odd_sem);
  13.         printf("%d ", i);
  14.         sem_post(&even_sem);
  15.     }
  16.     return NULL;
  17. }
  18.  
  19. void* print_even(void* arg)
  20. {
  21.     for(int i = 2; i <= limit; i += 2)
  22.     {
  23.         sem_wait(&even_sem);
  24.         printf("%d ", i);
  25.         sem_post(&odd_sem);
  26.     }
  27.     return NULL;
  28. }
  29.  
  30. int main()
  31. {
  32.     pthread_t t1, t2;
  33.  
  34.     printf("Enter limit: ");
  35.     scanf("%d", &limit);
  36.  
  37.     sem_init(&odd_sem, 0, 1);
  38.     sem_init(&even_sem, 0, 0);
  39.  
  40.     pthread_create(&t1, NULL, print_odd, NULL);
  41.     pthread_create(&t2, NULL, print_even, NULL);
  42.  
  43.     pthread_join(t1, NULL);
  44.     pthread_join(t2, NULL);
  45.  
  46.     sem_destroy(&odd_sem);
  47.     sem_destroy(&even_sem);
  48.  
  49.     return 0;
  50. }
Success #stdin #stdout 0.01s 5316KB
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stdout
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Enter limit: 1 2 3 4 5 6 7 8 9 10 11 12 13 14
https://ideone.com/2tJzFR
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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