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  1. #include<stdio.h>
  2. #include<semaphore.h>
  3. #include<fcntl.h>
  4. #include<sys/types.h>
  5. #include<sys/stat.h>
  6. #include<unistd.h>
  7. #include<pthread.h>
  8. struct{
  9.         int data[5];
  10.         sem_t *mutex[5];
  11.     }sh;
  12. char *name[]={"p1","p2","p3","p4","p5"};
  13. void *work(void *);
  14. main()
  15. {
  16.         pthread_t tid[5];
  17.         int i;
  18.         for(i=0;i<5;i++)
  19.         {
  20.             sh.mutex[i]=sem_open(name[i],O_CREAT,S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP,1);//
  21.         }
  22.         /* visit www.rgpv.tk for more */
  23.         pthread_setconcurrency(6);
  24.         setbuf(stdout,NULL);
  25.         for(i=0;i<5;i++)
  26.             pthread_create(&tid[i],NULL,work,&i);
  27.         for(i=0;i<5;i++)
  28.             pthread_join(tid[i],NULL);
  29.         for(i=0;i<5;i++)
  30.             sem_unlink(name[i]);
  31. }
  32. void *work(void *arg)
  33. {
  34.     int p,i=1;
  35.     p=*((int *)arg);
  36.     while(i++<2)
  37.     {
  38.         sem_wait(sh.mutex[p]);
  39.         sem_wait(sh.mutex[(p+1)%5]);
  40.         /* aditya jain */
  41.         sh.data[p]=1;
  42.         printf("p%d[%d %d %d %d %d]\n",p+1,sh.data[0],sh.data[1],sh.data[2],sh.data[3],sh.data[4]);
  43.         sleep(1);//eating
  44.         sh.data[p]=0;
  45.         sem_post(sh.mutex[p]);
  46.         sem_post(sh.mutex[(p+1)%5]);
  47.         sleep(2);//thinking
  48.     }
  49. }
Success #stdin #stdout 0s 20600KB
comments (?)
stdin
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Standard input is empty
stdout
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p1[1 0 0 0 0]
p1[1 0 0 0 0]
p1[1 0 0 0 0]
p1[1 0 0 0 0]
p1[1 0 0 0 0]
https://ideone.com/SBSZFg
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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