nptl_db/td_thr_validate.c

   1 /* Validate a thread handle.
   2    Copyright (C) 1999, 2001, 2002, 2003 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@redhat.com>, 1999.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include "thread_dbP.h"
  22
  23
  24 static td_err_e
  25 check_thread_list (const td_thrhandle_t *th, psaddr_t head)
  26 {
  27   td_err_e err;
  28   psaddr_t next, ofs;
  29
  30   err = DB_GET_FIELD (next, th->th_ta_p, head, list_t, next, 0);
  31   if (err == TD_OK)
  32     {
  33       if (next == 0)
  34         return TD_NOTHR;
  35       err = DB_GET_FIELD_ADDRESS (ofs, th->th_ta_p, 0, pthread, list, 0);
  36     }
  37
  38   while (err == TD_OK)
  39     {
  40       if (next == head)
  41         return TD_NOTHR;
  42
  43       if (next - (ofs - (psaddr_t) 0) == th->th_unique)
  44         return TD_OK;
  45
  46       err = DB_GET_FIELD (next, th->th_ta_p, next, list_t, next, 0);
  47     }
  48
  49   return err;
  50 }
  51
  52
  53 td_err_e
  54 td_thr_validate (const td_thrhandle_t *th)
  55 {
  56   td_err_e err;
  57   psaddr_t list;
  58
  59   LOG ("td_thr_validate");
  60
  61   /* First check the list with threads using user allocated stacks.  */
  62   err = DB_GET_SYMBOL (list, th->th_ta_p, __stack_user);
  63   if (err == TD_OK)
  64     err = check_thread_list (th, list);
  65
  66   /* If our thread is not on this list search the list with stack
  67      using implementation allocated stacks.  */
  68   if (err == TD_NOTHR)
  69     {
  70       err = DB_GET_SYMBOL (list, th->th_ta_p, stack_used);
  71       if (err == TD_OK)
  72         err = check_thread_list (th, list);
  73     }
  74
  75   return err;
  76 }