malloc/set-freeres.c

   1 /* Copyright (C) 1997, 1999, 2000 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <atomicity.h>
  20 #include <stdlib.h>
  21 #include <set-hooks.h>
  22 #include <libc-internal.h>
  23
  24 DEFINE_HOOK (__libc_subfreeres, (void));
  25
  26 void
  27 __libc_freeres (void)
  28 {
  29   /* This function might be called from different places.  So better
  30      protect for multiple executions since these are fatal.  */
  31   static long int already_called;
  32
  33   if (compare_and_swap (&already_called, 0, 1))
  34     RUN_HOOK (__libc_subfreeres, ());
  35 }