sysdeps/pthread/tst-cond3.c

   1 /* Copyright (C) 2002-2023 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <pthread.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <unistd.h>
  23
  24 static int do_test (void);
  25
  26 #define TEST_FUNCTION do_test ()
  27 #include "../test-skeleton.c"
  28
  29 /* Note that this test requires more than the standard.  It is
  30    required that there are no spurious wakeups if only more readers
  31    are added.  This is a reasonable demand.  */
  32
  33
  34 static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
  35 static pthread_mutex_t mut = PTHREAD_MUTEX_INITIALIZER;
  36
  37
  38 #define N 10
  39
  40
  41 static void *
  42 tf (void *arg)
  43 {
  44   int i = (long int) arg;
  45   int err;
  46
  47   /* Get the mutex.  */
  48   err = pthread_mutex_lock (&mut);
  49   if (err != 0)
  50     {
  51       printf ("child %d mutex_lock failed: %s\n", i, strerror (err));
  52       exit (1);
  53     }
  54
  55   /* This call should never return.  */
  56   xpthread_cond_wait (&cond, &mut);
  57   puts ("error: pthread_cond_wait in tf returned");
  58
  59   /* We should never get here.  */
  60   exit (1);
  61
  62   return NULL;
  63 }
  64
  65
  66 static int
  67 do_test (void)
  68 {
  69   int err;
  70   int i;
  71
  72   for (i = 0; i < N; ++i)
  73     {
  74       pthread_t th;
  75
  76       if (i != 0)
  77         {
  78           /* Release the mutex.  */
  79           err = pthread_mutex_unlock (&mut);
  80           if (err != 0)
  81             {
  82               printf ("mutex_unlock %d failed: %s\n", i, strerror (err));
  83               return 1;
  84             }
  85         }
  86
  87       err = pthread_create (&th, NULL, tf, (void *) (long int) i);
  88       if (err != 0)
  89         {
  90           printf ("create %d failed: %s\n", i, strerror (err));
  91           return 1;
  92         }
  93
  94       /* Get the mutex.  */
  95       err = pthread_mutex_lock (&mut);
  96       if (err != 0)
  97         {
  98           printf ("mutex_lock %d failed: %s\n", i, strerror (err));
  99           return 1;
 100         }
 101     }
 102
 103   delayed_exit (1);
 104
 105   /* This call should never return.  */
 106   xpthread_cond_wait (&cond, &mut);
 107
 108   puts ("error: pthread_cond_wait in do_test returned");
 109   return 1;
 110 }