nptl/pthread_attr_init.c

   1 /* Copyright (C) 2002 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <assert.h>
  21 #include <errno.h>
  22 #include <string.h>
  23 #include <unistd.h>
  24 #include "pthreadP.h"
  25
  26 #include <shlib-compat.h>
  27
  28
  29 struct pthread_attr *__attr_list;
  30 lll_lock_t __attr_list_lock = LLL_LOCK_INITIALIZER;
  31
  32
  33 int
  34 __pthread_attr_init_2_1 (attr)
  35      pthread_attr_t *attr;
  36 {
  37   struct pthread_attr *iattr;
  38
  39   /* Many elements are initialized to zero so let us do it all at
  40      once.  This also takes care of clearing the bytes which are not
  41      internally used.  */
  42   memset (attr, '\0', __SIZEOF_PTHREAD_ATTR_T);
  43
  44   assert (sizeof (*attr) >= sizeof (struct pthread_attr));
  45   iattr = (struct pthread_attr *) attr;
  46
  47   /* Default guard size specified by the standard.  */
  48   iattr->guardsize = __getpagesize ();
  49
  50   /* Enqueue the attributes to the list of all known variables.  */
  51   if (DEBUGGING_P)
  52     {
  53       lll_lock (__attr_list_lock);
  54
  55       iattr->next = __attr_list;
  56       __attr_list = iattr;
  57
  58       lll_unlock (__attr_list_lock);
  59     }
  60
  61   return 0;
  62 }
  63 versioned_symbol (libpthread, __pthread_attr_init_2_1, pthread_attr_init,
  64                   GLIBC_2_1);
  65
  66
  67 #if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1)
  68 int
  69 __pthread_attr_init_2_0 (attr)
  70      pthread_attr_t *attr;
  71 {
  72   /* This code is specific to the old LinuxThread code which has a too
  73      small pthread_attr_t definition.  The struct looked like
  74      this:  */
  75   struct old_attr
  76   {
  77     int detachstate;
  78     int schedpolicy;
  79     struct sched_param schedparam;
  80     int inheritsched;
  81     int scope;
  82   } *iattr;
  83
  84   /* Many elements are initialized to zero so let us do it all at
  85      once.  This also takes care of clearing the bytes which are not
  86      internally used.  */
  87   memset (attr, '\0', sizeof (struct old_attr));
  88
  89   iattr = (struct old_attr *) attr;
  90
  91   /* We cannot enqueue the attribute because that member is not in the
  92      old attribute structure.  */
  93   return 0;
  94 }
  95 compat_symbol (libpthread, __pthread_attr_init_2_0, pthread_attr_init,
  96                GLIBC_2_0);
  97 #endif