nptl/tst-cond3.c

   1 /* Copyright (C) 2002 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <pthread.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <unistd.h>
  25
  26
  27 /* Note that this test requires more than the standard.  It is
  28    required that there are no spurious wakeups if only more readers
  29    are added.  This is a reasonable demand.  */
  30
  31
  32 static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
  33 static pthread_mutex_t mut = PTHREAD_MUTEX_INITIALIZER;
  34
  35
  36 #define N 10
  37
  38
  39 static void *
  40 tf (void *arg)
  41 {
  42   int i = (long int) arg;
  43   int err;
  44
  45   /* Get the mutex.  */
  46   err = pthread_mutex_lock (&mut);
  47   if (err != 0)
  48     {
  49       printf ("child %d mutex_lock failed: %s\n", i, strerror (err));
  50       exit (1);
  51     }
  52
  53   /* This call should never return.  */
  54   pthread_cond_wait (&cond, &mut);
  55
  56   /* We should never get here.  */
  57   exit (1);
  58
  59   return NULL;
  60 }
  61
  62
  63 static int
  64 do_test (void)
  65 {
  66   int err;
  67   int i;
  68
  69   for (i = 0; i < N; ++i)
  70     {
  71       pthread_t th;
  72
  73       if (i != 0)
  74         {
  75           /* Release the mutex.  */
  76           err = pthread_mutex_unlock (&mut);
  77           if (err != 0)
  78             {
  79               printf ("mutex_unlock %d failed: %s\n", i, strerror (err));
  80               return 1;
  81             }
  82         }
  83
  84       err = pthread_create (&th, NULL, tf, (void *) (long int) i);
  85       if (err != 0)
  86         {
  87           printf ("create %d failed: %s\n", i, strerror (err));
  88           return 1;
  89         }
  90
  91       /* Get the mutex.  */
  92       err = pthread_mutex_lock (&mut);
  93       if (err != 0)
  94         {
  95           printf ("mutex_lock %d failed: %s\n", i, strerror (err));
  96           return 1;
  97         }
  98     }
  99
 100   /* Set an alarm for 1 second.  The wrapper will expect this.  */
 101   alarm (1);
 102
 103   /* This call should never return.  */
 104   pthread_cond_wait (&cond, &mut);
 105
 106   puts ("cond_wait returned");
 107   return 1;
 108 }
 109
 110
 111 #define EXPECTED_SIGNAL SIGALRM
 112 #define TEST_FUNCTION do_test ()
 113 #include "../test-skeleton.c"