libpthread/nptl/pthread_attr_init.c

   1 /* Copyright (C) 2002, 2003, 2004, 2007 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <assert.h>
  20 #include <errno.h>
  21 #include <string.h>
  22 #include <unistd.h>
  23 #include "pthreadP.h"
  24
  25
  26 struct pthread_attr *__attr_list;
  27 int __attr_list_lock = LLL_LOCK_INITIALIZER;
  28
  29
  30 int
  31 attribute_protected
  32 pthread_attr_init (
  33      pthread_attr_t *attr)
  34 {
  35   struct pthread_attr *iattr;
  36
  37   /* Many elements are initialized to zero so let us do it all at
  38      once.  This also takes care of clearing the bytes which are not
  39      internally used.  */
  40   memset (attr, '\0', __SIZEOF_PTHREAD_ATTR_T);
  41
  42   assert (sizeof (*attr) >= sizeof (struct pthread_attr));
  43   iattr = (struct pthread_attr *) attr;
  44
  45   /* Default guard size specified by the standard.  */
  46   iattr->guardsize = getpagesize ();
  47
  48   return 0;
  49 }