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  1. #include<stdio.h>
  2. #include<semaphore.h>
  3. #include<pthread.h>
  4. #include<unistd.h>
  5. #include<stdlib.h>
  6. sem_t chopsticks[3];
  7. void *philosopher(void *arg);
  8. int main(){
  9.     pthread_t t[3];
  10.     for(int i=0;i<3;i++){
  11.         sem_init(&chopsticks[i],0,1);
  12.     }
  13.     for(int i=0;i<3;i++){
  14.         int *p=(int *)malloc(sizeof(int));
  15.         *p=i;
  16.         pthread_create(&t[i],NULL,philosopher,p);
  17.     }
  18.     for(int i=0;i<3;i++){
  19.         pthread_join(t[i],NULL);
  20.     }
  21.     return 0;
  22. }
  23. void *philosopher(void *arg){
  24.     int id=*(int *)arg;
  25.     printf("Philosopher %d is thinking\n", id);
  26.     sleep(1);
  27.     printf("Philosopher %d wants to eat\n", id);
  28.     sem_wait(&chopsticks[id]);
  29.     sem_wait(&chopsticks[(id+1)%3]);
  30.     printf("Philosopher %d is eating\n", id);
  31.     sleep(2);
  32.     printf("Philosopher %d stops eating and came back to thinking state\n", id);
  33.     sem_post(&chopsticks[(id+1)%3]);
  34.     sem_post(&chopsticks[id]);
  35. }
Success #stdin #stdout 0s 5304KB
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stdin
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Standard input is empty
stdout
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Philosopher 2 is thinking
Philosopher 1 is thinking
Philosopher 0 is thinking
Philosopher 2 wants to eat
Philosopher 2 is eating
Philosopher 1 wants to eat
Philosopher 0 wants to eat
Philosopher 2 stops eating and came back to thinking state
Philosopher 1 is eating
Philosopher 1 stops eating and came back to thinking state
Philosopher 0 is eating
Philosopher 0 stops eating and came back to thinking state
https://ideone.com/d4tBjJ
language:
C (gcc 8.3)
created:
21 days ago
visibility:
public

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