sysdeps/pthread/tst-rwlock5.c

   1 /* Copyright (C) 2002-2024 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 <signal.h>
  20 #include <stdio.h>
  21 #include <stdlib.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 static pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;
  30 static pthread_rwlock_t r;
  31
  32
  33 static void *
  34 tf (void *arg)
  35 {
  36   if (pthread_rwlock_wrlock (&r) == 0)
  37     {
  38       puts ("child: rwlock_wrlock succeeded");
  39       exit (1);
  40     }
  41
  42   puts ("child: rwlock_wrlock returned");
  43
  44   exit (1);
  45 }
  46
  47
  48 static int
  49 do_test (void)
  50 {
  51   pthread_t th;
  52
  53   if (pthread_rwlock_init (&r, NULL) != 0)
  54     {
  55       puts ("rwlock_init failed");
  56       return 1;
  57     }
  58
  59   if (pthread_rwlock_wrlock (&r) != 0)
  60     {
  61       puts ("rwlock_wrlock failed");
  62       return 1;
  63     }
  64
  65   if (pthread_mutex_lock (&m) != 0)
  66     {
  67       puts ("mutex_lock failed");
  68       return 1;
  69     }
  70
  71   if (pthread_create (&th, NULL, tf, NULL) != 0)
  72     {
  73       puts ("create failed");
  74       return 1;
  75     }
  76
  77   delayed_exit (1);
  78   /* This call should never return.  */
  79   xpthread_mutex_lock (&m);
  80
  81   puts ("2nd mutex_lock returned");
  82   return 1;
  83 }