nptl/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 #if __HAVE_64B_ATOMICS
  38   if ((u.ns.data >> SEM_NWAITERS_SHIFT) != 0)
  39 #else
  40   if (u.ns.nwaiters != 0)
  41 #endif
  42     {
  43       puts ("nwaiters not initialized");
  44       return 1;
  45     }
  46
  47   if (pthread_create (&th, NULL, tf, &u.s) != 0)
  48     {
  49       puts ("pthread_create failed");
  50       return 1;
  51     }
  52
  53   sleep (1);
  54
  55   if (pthread_cancel (th) != 0)
  56     {
  57       puts ("pthread_cancel failed");
  58       return 1;
  59     }
  60
  61   void *r;
  62   if (pthread_join (th, &r) != 0)
  63     {
  64       puts ("pthread_join failed");
  65       return 1;
  66     }
  67   if (r != PTHREAD_CANCELED && --tries > 0)
  68     {
  69       /* Maybe we get the scheduling right the next time.  */
  70       sem_destroy (&u.s);
  71       goto again;
  72     }
  73
  74 #if __HAVE_64B_ATOMICS
  75   if ((u.ns.data >> SEM_NWAITERS_SHIFT) != 0)
  76 #else
  77   if (u.ns.nwaiters != 0)
  78 #endif
  79     {
  80       puts ("nwaiters not reset");
  81       return 1;
  82     }
  83
  84   return 0;
  85 }