stdlib/cxa_finalize.c

   1 /* Copyright (C) 1999, 2001, 2002, 2003 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 <assert.h>
  20 #include <stdlib.h>
  21 #include <atomic.h>
  22 #include "exit.h"
  23 #include <fork.h>
  24
  25 /* If D is non-NULL, call all functions registered with `__cxa_atexit'
  26    with the same dso handle.  Otherwise, if D is NULL, call all of the
  27    registered handlers.  */
  28 void
  29 __cxa_finalize (void *d)
  30 {
  31   struct exit_function_list *funcs;
  32
  33   for (funcs = __exit_funcs; funcs; funcs = funcs->next)
  34     {
  35       struct exit_function *f;
  36
  37       for (f = &funcs->fns[funcs->idx - 1]; f >= &funcs->fns[0]; --f)
  38         if ((d == NULL || d == f->func.cxa.dso_handle)
  39             /* We don't want to run this cleanup more than once.  */
  40             && ! atomic_compare_and_exchange_bool_acq (&f->flavor, ef_free,
  41                                                        ef_cxa))
  42           (*f->func.cxa.fn) (f->func.cxa.arg, 0);
  43     }
  44
  45   /* Remove the registered fork handlers.  We do not have to
  46      unregister anything if the program is going to terminate anyway.  */
  47 #ifdef UNREGISTER_ATFORK
  48   if (d != NULL)
  49     UNREGISTER_ATFORK (d);
  50 #endif
  51 }