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  1. #include <stdio.h>
  2. #include <pthread.h>
  3. #include <semaphore.h>
  4. sem_t odd_sem, even_sem;
  5. int limit;
  6. void* print_odd(void* arg)
  7. {
  8.     for(int i = 1; i <= limit; i += 2)
  9.     {
  10.         sem_wait(&odd_sem);
  11.         printf("%d ", i);
  12.         sem_post(&even_sem);
  13.     }
  14.     return NULL;
  15. }
  16. void* print_even(void* arg)
  17. {
  18.     for(int i = 2; i <= limit; i += 2)
  19.     {
  20.         sem_wait(&even_sem);
  21.         printf("%d ", i);
  22.         sem_post(&odd_sem);
  23.     }
  24.     return NULL;
  25. }
  26. int main()
  27. {
  28.     pthread_t t1, t2;
  29.     printf("Enter limit: ");
  30.     scanf("%d", &limit);
  31.     sem_init(&odd_sem, 0, 1);
  32.     sem_init(&even_sem, 0, 0);
  33.     pthread_create(&t1, NULL, print_odd, NULL);
  34.     pthread_create(&t2, NULL, print_even, NULL);
  35.     pthread_join(t1, NULL);
  36.     pthread_join(t2, NULL);
  37.     sem_destroy(&odd_sem);
  38.     sem_destroy(&even_sem);
  39.  
  40.     return 0;
  41. }
Success #stdin #stdout 0.01s 5288KB
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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/2ap75f
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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