nptl/pthread_mutexattr_init.c

   1 /* Copyright (C) 2002-2021 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 <string.h>
  20 #include <pthreadP.h>
  21
  22
  23 int
  24 __pthread_mutexattr_init (pthread_mutexattr_t *attr)
  25 {
  26   ASSERT_TYPE_SIZE (pthread_mutexattr_t, __SIZEOF_PTHREAD_MUTEXATTR_T);
  27   ASSERT_PTHREAD_INTERNAL_SIZE (pthread_mutexattr_t,
  28                                 struct pthread_mutexattr);
  29
  30   if (sizeof (struct pthread_mutexattr) != sizeof (pthread_mutexattr_t))
  31     memset (attr, '\0', sizeof (*attr));
  32
  33   /* We use bit 31 to signal whether the mutex is going to be
  34      process-shared or not.  By default it is zero, i.e., the mutex is
  35      not process-shared.  */
  36   ((struct pthread_mutexattr *) attr)->mutexkind = PTHREAD_MUTEX_NORMAL;
  37
  38   return 0;
  39 }
  40 weak_alias (__pthread_mutexattr_init, pthread_mutexattr_init)
  41 hidden_def (__pthread_mutexattr_init)