htl/tests/test-10.c

   1 /* Test error checking mutexes.
   2    Copyright (C) 2000-2021 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   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 #define _GNU_SOURCE
  20
  21 #include <pthread.h>
  22 #include <assert.h>
  23 #include <error.h>
  24 #include <errno.h>
  25
  26 int
  27 main (int argc, char **argv)
  28 {
  29   error_t err;
  30   pthread_mutexattr_t mattr;
  31   pthread_mutex_t mutex;
  32
  33   err = pthread_mutexattr_init (&mattr);
  34   if (err)
  35     error (1, err, "pthread_mutexattr_init");
  36
  37   err = pthread_mutexattr_settype (&mattr, PTHREAD_MUTEX_ERRORCHECK);
  38   if (err)
  39     error (1, err, "pthread_mutexattr_settype");
  40
  41   err = pthread_mutex_init (&mutex, &mattr);
  42   if (err)
  43     error (1, err, "pthread_mutex_init");
  44
  45   err = pthread_mutexattr_destroy (&mattr);
  46   if (err)
  47     error (1, err, "pthread_mutexattr_destroy");
  48
  49   err = pthread_mutex_lock (&mutex);
  50   assert (err == 0);
  51
  52   err = pthread_mutex_lock (&mutex);
  53   assert (err == EDEADLK);
  54
  55   err = pthread_mutex_unlock (&mutex);
  56   assert (err == 0);
  57
  58   err = pthread_mutex_unlock (&mutex);
  59   assert (err == EPERM);
  60
  61   return 0;
  62 }