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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <pthread.h>
  4. #include <semaphore.h>
  5. #include <unistd.h>
  6.  
  7. sem_t room;
  8. sem_t chopstick[5];
  9.  
  10. void eat(int phil);
  11.  
  12. void* philosopher(void* num) {
  13.     int phil = *(int*)num;
  14.  
  15.     sem_wait(&room);
  16.  
  17.     printf("\nPhilosopher %d is thinking", phil);
  18.     sleep(1);
  19.  
  20.     sem_wait(&chopstick[phil]);
  21.     sem_wait(&chopstick[(phil+1)%5]);
  22.  
  23.     eat(phil);
  24.  
  25.     sleep(1);
  26.  
  27.     sem_post(&chopstick[phil]);
  28.     sem_post(&chopstick[(phil+1)%5]);
  29.  
  30.     printf("\nPhilosopher %d finished eating", phil);
  31.  
  32.     sem_post(&room);
  33.  
  34.     return NULL;
  35. }
  36.  
  37. void eat(int phil) {
  38.     printf("\nPhilosopher %d is eating", phil);
  39. }
  40.  
  41. int main() {
  42.     int i, a[5];
  43.     pthread_t tid[5];
  44.  
  45.     sem_init(&room, 0, 4);
  46.  
  47.     for (i = 0; i < 5; i++) {
  48.         sem_init(&chopstick[i], 0, 1);
  49.     }
  50.  
  51.     for (i = 0; i < 5; i++) {
  52.         a[i] = i;
  53.         pthread_create(&tid[i], NULL, philosopher, (void*) &a[i]);
  54.     }
  55.  
  56.     for (i = 0; i < 5; i++) {
  57.         pthread_join(tid[i], NULL);
  58.     }
  59.  
  60.     return 0;
  61. }
  62.  
Success #stdin #stdout 0s 5284KB
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stdin
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Standard input is empty
stdout
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Philosopher 4 is thinking
Philosopher 3 is thinking
Philosopher 2 is thinking
Philosopher 1 is thinking
Philosopher 4 is eating
Philosopher 4 finished eating
Philosopher 3 is eating
Philosopher 0 is thinking
Philosopher 3 finished eating
Philosopher 2 is eating
Philosopher 2 finished eating
Philosopher 1 is eating
Philosopher 1 finished eating
Philosopher 0 is eating
Philosopher 0 finished eating
https://ideone.com/ZTp1KH
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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