1  /* Test error checking mutexes.
       2     Copyright (C) 2000-2023 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  }