malloc/set-freeres.c

   1 /* Copyright (C) 1997, 1999, 2000, 2001, 2002 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <atomicity.h>
  20 #include <stdlib.h>
  21 #include <set-hooks.h>
  22 #include <libc-internal.h>
  23
  24 #ifdef USE_IN_LIBIO
  25 # include "../libio/libioP.h"
  26 #endif
  27
  28 DEFINE_HOOK (__libc_subfreeres, (void));
  29
  30 void
  31 __libc_freeres (void)
  32 {
  33   /* This function might be called from different places.  So better
  34      protect for multiple executions since these are fatal.  */
  35   static long int already_called;
  36
  37   if (compare_and_swap (&already_called, 0, 1))
  38     {
  39 #ifdef USE_IN_LIBIO
  40       _IO_cleanup ();
  41 #endif
  42
  43       RUN_HOOK (__libc_subfreeres, ());
  44     }
  45 }
  46 libc_hidden_def (__libc_freeres)