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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <pthread.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <unistd.h>
  24
  25
  26 /* Note that this test requires more than the standard.  It is
  27    required that there are no spurious wakeups if only more readers
  28    are added.  This is a reasonable demand.  */
  29
  30
  31 static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
  32 static pthread_mutex_t mut = PTHREAD_MUTEX_INITIALIZER;
  33
  34
  35 #define N 10
  36
  37
  38 static void *
  39 tf (void *arg)
  40 {
  41   int i = (long int) arg;
  42   int err;
  43
  44   /* Get the mutex.  */
  45   err = pthread_mutex_lock (&mut);
  46   if (err != 0)
  47     {
  48       printf ("child %d mutex_lock failed: %s\n", i, strerror (err));
  49       exit (1);
  50     }
  51
  52   /* This call should never return.  */
  53   pthread_cond_wait (&cond, &mut);
  54
  55   /* We should never get here.  */
  56   exit (1);
  57
  58   return NULL;
  59 }
  60
  61
  62 static int
  63 do_test (void)
  64 {
  65   int err;
  66   int i;
  67
  68   for (i = 0; i < N; ++i)
  69     {
  70       pthread_t th;
  71
  72       if (i != 0)
  73         {
  74           /* Release the mutex.  */
  75           err = pthread_mutex_unlock (&mut);
  76           if (err != 0)
  77             {
  78               printf ("mutex_unlock %d failed: %s\n", i, strerror (err));
  79               return 1;
  80             }
  81         }
  82
  83       err = pthread_create (&th, NULL, tf, (void *) (long int) i);
  84       if (err != 0)
  85         {
  86           printf ("create %d failed: %s\n", i, strerror (err));
  87           return 1;
  88         }
  89
  90       /* Get the mutex.  */
  91       err = pthread_mutex_lock (&mut);
  92       if (err != 0)
  93         {
  94           printf ("mutex_lock %d failed: %s\n", i, strerror (err));
  95           return 1;
  96         }
  97     }
  98
  99   /* Set an alarm for 1 second.  The wrapper will expect this.  */
 100   alarm (1);
 101
 102   /* This call should never return.  */
 103   pthread_cond_wait (&cond, &mut);
 104
 105   puts ("cond_wait returned");
 106   return 1;
 107 }
 108
 109
 110 #define EXPECTED_SIGNAL SIGALRM
 111 #define TEST_FUNCTION do_test ()
 112 #include "../test-skeleton.c"