1: /* Validate a thread handle.
    2:    Copyright (C) 1999,2001,2002,2003,2004,2007 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: #include <stdbool.h>
   23: 
   24: static td_err_e
   25: check_thread_list (const td_thrhandle_t *th, psaddr_t head, bool *uninit)
   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:         {
   35:           *uninit = true;
   36:           return TD_NOTHR;
   37:         }
   38:       err = DB_GET_FIELD_ADDRESS (ofs, th->th_ta_p, 0, pthread, list, 0);
   39:     }
   40: 
   41:   while (err == TD_OK)
   42:     {
   43:       if (next == head)
   44:         return TD_NOTHR;
   45: 
   46:       if (next - (ofs - (psaddr_t) 0) == th->th_unique)
   47:         return TD_OK;
   48: 
   49:       err = DB_GET_FIELD (next, th->th_ta_p, next, list_t, next, 0);
   50:     }
   51: 
   52:   return err;
   53: }
   54: 
   55: 
   56: td_err_e
   57: td_thr_validate (const td_thrhandle_t *th)
   58: {
   59:   td_err_e err;
   60:   psaddr_t list;
   61: 
   62:   LOG ("td_thr_validate");
   63: 
   64:   /* First check the list with threads using user allocated stacks.  */
   65:   bool uninit = false;
   66:   err = DB_GET_SYMBOL (list, th->th_ta_p, __stack_user);
   67:   if (err == TD_OK)
   68:     err = check_thread_list (th, list, &uninit);
   69: 
   70:   /* If our thread is not on this list search the list with stack
   71:      using implementation allocated stacks.  */
   72:   if (err == TD_NOTHR)
   73:     {
   74:       err = DB_GET_SYMBOL (list, th->th_ta_p, stack_used);
   75:       if (err == TD_OK)
   76:         err = check_thread_list (th, list, &uninit);
   77: 
   78:       if (err == TD_NOTHR && uninit && th->th_unique == 0)
   79:         /* __pthread_initialize_minimal has not run yet.
   80:            There is only the special case thread handle.  */
   81:         err = TD_OK;
   82:     }
   83: 
   84:   return err;
   85: }