sysdeps/pthread/tst-rwlock5.c

   1 /* Copyright (C) 2002-2020 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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <pthread.h>
  20 #include <signal.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <unistd.h>
  24
  25 static int do_test (void);
  26
  27 #define TEST_FUNCTION do_test ()
  28 #include "../test-skeleton.c"
  29
  30 static pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;
  31 static pthread_rwlock_t r;
  32
  33
  34 static void *
  35 tf (void *arg)
  36 {
  37   if (pthread_rwlock_wrlock (&r) == 0)
  38     {
  39       puts ("child: rwlock_wrlock succeeded");
  40       exit (1);
  41     }
  42
  43   puts ("child: rwlock_wrlock returned");
  44
  45   exit (1);
  46 }
  47
  48
  49 static int
  50 do_test (void)
  51 {
  52   pthread_t th;
  53
  54   if (pthread_rwlock_init (&r, NULL) != 0)
  55     {
  56       puts ("rwlock_init failed");
  57       return 1;
  58     }
  59
  60   if (pthread_rwlock_wrlock (&r) != 0)
  61     {
  62       puts ("rwlock_wrlock failed");
  63       return 1;
  64     }
  65
  66   if (pthread_mutex_lock (&m) != 0)
  67     {
  68       puts ("mutex_lock failed");
  69       return 1;
  70     }
  71
  72   if (pthread_create (&th, NULL, tf, NULL) != 0)
  73     {
  74       puts ("create failed");
  75       return 1;
  76     }
  77
  78   delayed_exit (1);
  79   /* This call should never return.  */
  80   xpthread_mutex_lock (&m);
  81
  82   puts ("2nd mutex_lock returned");
  83   return 1;
  84 }