elf/dl-scope.c

   1 /* Memory handling for the scope data structures.
   2    Copyright (C) 2009 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   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 <stdlib.h>
  21 #include <ldsodefs.h>
  22 #include <sysdep-cancel.h>
  23
  24
  25 int
  26 _dl_scope_free (void *old)
  27 {
  28   struct dl_scope_free_list *fsl;
  29 #define DL_SCOPE_FREE_LIST_SIZE (sizeof (fsl->list) / sizeof (fsl->list[0]))
  30
  31   if (RTLD_SINGLE_THREAD_P)
  32     free (old);
  33   else if ((fsl = GL(dl_scope_free_list)) == NULL)
  34     {
  35       GL(dl_scope_free_list) = fsl = malloc (sizeof (*fsl));
  36       if (fsl == NULL)
  37         {
  38           THREAD_GSCOPE_WAIT ();
  39           free (old);
  40           return 1;
  41         }
  42       else
  43         {
  44           fsl->list[0] = old;
  45           fsl->count = 1;
  46         }
  47     }
  48   else if (fsl->count < DL_SCOPE_FREE_LIST_SIZE)
  49     fsl->list[fsl->count++] = old;
  50   else
  51     {
  52       THREAD_GSCOPE_WAIT ();
  53       while (fsl->count > 0)
  54         free (fsl->list[--fsl->count]);
  55       return 1;
  56     }
  57   return 0;
  58 }