fork download
copy 
  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 * philosopher(void *);
  11. void eat(int);
  12. int main()
  13. {
  14. 	int i,a[5];
  15. 	pthread_t tid[5];
  16.  
  17. 	sem_init(&room,0,4);
  18.  
  19. 	for(i=0;i<5;i++){
  20. 		sem_init(&chopstick[i],0,1);
  21. 	}
  22.  
  23. 	for(i=0;i<5;i++){
  24. 		a[i]=i;
  25. 		pthread_create(&tid[i],NULL,philosopher,(void *)&a[i]);
  26. 	}
  27. 	for(i=0;i<5;i++){
  28. 		pthread_join(tid[i],NULL);
  29. 	}
  30. 	return 0;
  31. }
  32.  
  33. void * philosopher(void * num)
  34. {
  35. 	int phil=*(int *)num;
  36.  
  37. 	sem_wait(&room);
  38. 	printf("\nPhilosopher %d has entered room",phil);
  39. 	sem_wait(&chopstick[phil]);
  40. 	sem_wait(&chopstick[(phil+1)%5]);
  41.  
  42. 	eat(phil);
  43. 	sleep(2);
  44. 	printf("\nPhilosopher %d has finished eating",phil);
  45.  
  46. 	sem_post(&chopstick[(phil+1)%5]);
  47. 	sem_post(&chopstick[phil]);
  48. 	sem_post(&room);
  49. }
  50.  
  51. void eat(int phil)
  52. {
  53. 	printf("\nPhilosopher %d is eating",phil);
  54. }
Success #stdin #stdout 0s 5308KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Philosopher 4 has entered room
Philosopher 4 is eating
Philosopher 3 has entered room
Philosopher 2 has entered room
Philosopher 1 has entered room
Philosopher 4 has finished eating
Philosopher 3 is eating
Philosopher 0 has entered room
Philosopher 3 has finished eating
Philosopher 2 is eating
Philosopher 2 has finished eating
Philosopher 1 is eating
Philosopher 1 has finished eating
Philosopher 0 is eating
Philosopher 0 has finished eating
https://ideone.com/VmWWPd
language:
C (gcc 8.3)
created:
10 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!