fbtl/tst-sem11.c

   1 #include <semaphore.h>
   2 #include <stdio.h>
   3 #include <unistd.h>
   4 #include <pthread.h>
   5 #include <internaltypes.h>
   6
   7 #ifndef SEM_WAIT
   8 # define SEM_WAIT(s) sem_wait (s)
   9 #endif
  10
  11 static void *
  12 tf (void *arg)
  13 {
  14 #ifdef PREPARE
  15   PREPARE
  16 #endif
  17   SEM_WAIT (arg);
  18   return NULL;
  19 }
  20
  21 int
  22 main (void)
  23 {
  24   int tries = 5;
  25   pthread_t th;
  26   union
  27   {
  28     sem_t s;
  29     struct new_sem ns;
  30   } u;
  31  again:
  32   if (sem_init (&u.s, 0, 0) != 0)
  33     {
  34       puts ("sem_init failed");
  35       return 1;
  36     }
  37
  38   if (u.ns.nwaiters != 0)
  39     {
  40       puts ("nwaiters not initialized");
  41       return 1;
  42     }
  43
  44   if (pthread_create (&th, NULL, tf, &u.s) != 0)
  45     {
  46       puts ("pthread_create failed");
  47       return 1;
  48     }
  49
  50   sleep (1);
  51
  52   if (pthread_cancel (th) != 0)
  53     {
  54       puts ("pthread_cancel failed");
  55       return 1;
  56     }
  57
  58   void *r;
  59   if (pthread_join (th, &r) != 0)
  60     {
  61       puts ("pthread_join failed");
  62       return 1;
  63     }
  64   if (r != PTHREAD_CANCELED && --tries > 0)
  65     {
  66       /* Maybe we get the scheduling right the next time.  */
  67       sem_destroy (&u.s);
  68       goto again;
  69     }
  70
  71   if (u.ns.nwaiters != 0)
  72     {
  73       puts ("nwaiters not reset");
  74       return 1;
  75     }
  76
  77   return 0;
  78 }