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  1. #include <stdio.h>
  2. #include <unistd.h>
  3. #include <pthread.h>
  4. #include <semaphore.h>
  5. #include <stdlib.h>
  6.  
  7. sem_t chopstick[5];
  8.  
  9. void eat(int a)
  10. {
  11.     printf("\nphilosopher %d eats",a);
  12. }
  13.  
  14. void* philos(void* n)
  15. {
  16.     int ph=*(int *)n;
  17.     printf("\nphilosopher %d wants to eat",ph);
  18.     printf("\nphilosppher %d tries to pick up the left chopstick",ph);
  19.     sem_wait(&chopstick[ph]);
  20.     printf("\nphilosopher %d successfully pick up the left chopstick",ph);
  21.     printf("\nphilosppher %d tries to pick up the right chopstick",ph);
  22.     sem_wait(&chopstick[(ph+1)%5]);
  23.     printf("\nphilosopher %d successfully pick up the right chopstick",ph);
  24.     eat(ph);
  25.     sleep(2);
  26.     printf("philosopher %d finished eating",ph);
  27.     printf("\nphilosopher %d puts down the left chopstick",ph);
  28.     sem_post(&chopstick[(ph+1)%5]);
  29.     printf("\nphilosopher %d puts down the right chopstick",ph);
  30.     sem_post(&chopstick[ph]);
  31. }
  32.  
  33.  
  34. int main()
  35. {
  36.     int i,n[5];
  37.     pthread_t T[5];
  38.     for(i=0;i<5;i++)
  39.     {
  40.         sem_init(&chopstick[i],0,1);
  41.     }
  42.     for(i=0;i<5;i++)
  43.     {
  44.         n[i]=i;
  45.         pthread_create(&T[i],NULL,philos,(void *)&n[i]);
  46.     }
  47.     for(i=0;i<5;i++)
  48.     {
  49.         pthread_join(T[i],NULL);
  50.     }
  51.  
  52. }
Success #stdin #stdout 0s 5288KB
comments (?)
stdin 
Standard input is empty
stdout 
philosopher 4 wants to eat
philosppher 4 tries to pick up the left chopstick
philosopher 4 successfully pick up the left chopstick
philosppher 4 tries to pick up the right chopstick
philosopher 4 successfully pick up the right chopstick
philosopher 4 eats
philosopher 3 wants to eat
philosppher 3 tries to pick up the left chopstick
philosopher 3 successfully pick up the left chopstick
philosppher 3 tries to pick up the right chopstick
philosopher 2 wants to eat
philosppher 2 tries to pick up the left chopstick
philosopher 2 successfully pick up the left chopstick
philosppher 2 tries to pick up the right chopstick
philosopher 1 wants to eat
philosppher 1 tries to pick up the left chopstick
philosopher 1 successfully pick up the left chopstick
philosppher 1 tries to pick up the right chopstick
philosopher 0 wants to eat
philosppher 0 tries to pick up the left chopstickphilosopher 4 finished eating
philosopher 4 puts down the left chopstick
philosopher 4 puts down the right chopstick
philosopher 3 successfully pick up the right chopstick
philosopher 3 eats
philosopher 0 successfully pick up the left chopstick
philosppher 0 tries to pick up the right chopstickphilosopher 3 finished eating
philosopher 3 puts down the left chopstick
philosopher 3 puts down the right chopstick
philosopher 2 successfully pick up the right chopstick
philosopher 2 eatsphilosopher 2 finished eating
philosopher 2 puts down the left chopstick
philosopher 2 puts down the right chopstick
philosopher 1 successfully pick up the right chopstick
philosopher 1 eatsphilosopher 1 finished eating
philosopher 1 puts down the left chopstick
philosopher 1 puts down the right chopstick
philosopher 0 successfully pick up the right chopstick
philosopher 0 eatsphilosopher 0 finished eating
philosopher 0 puts down the left chopstick
philosopher 0 puts down the right chopstick
https://ideone.com/0VJ1j1
language:
C (gcc 8.3)
created:
11 days ago
visibility:
public

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