nptl_db/td_thr_tsd.c

   1 /* Get a thread-specific data pointer for a thread.
   2    Copyright (C) 1999, 2001, 2002 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 td_err_e
  25 td_thr_tsd (const td_thrhandle_t *th, const thread_key_t tk, void **data)
  26 {
  27   LOG ("td_thr_tsd");
  28
  29   /* Check correct value of key.  */
  30   if (tk >= th->th_ta_p->pthread_keys_max)
  31     return TD_BADKEY;
  32
  33   /* Get the key entry.  */
  34   uintptr_t seq;
  35   if (ps_pdread (th->th_ta_p->ph, &th->th_ta_p->keys[tk].seq, &seq,
  36                  sizeof (uintptr_t)) != PS_OK)
  37     return TD_ERR;      /* XXX Other error value?  */
  38
  39   /* Fail if this key is not at all used.  */
  40   if (KEY_UNUSED (seq))
  41     return TD_BADKEY;
  42
  43   /* Compute the indeces.  */
  44   int pthread_key_2ndlevel_size = th->th_ta_p->pthread_key_2ndlevel_size;
  45   unsigned int idx1st = tk / pthread_key_2ndlevel_size;
  46   unsigned int idx2nd = tk % pthread_key_2ndlevel_size;
  47
  48   struct pthread_key_data *level1;
  49   if (ps_pdread (th->th_ta_p->ph,
  50                  &((struct pthread *) th->th_unique)->specific[idx1st],
  51                  &level1, sizeof (level1)) != PS_OK)
  52     return TD_ERR;      /* XXX Other error value?  */
  53
  54   /* Check the pointer to the second level array.  */
  55   if (level1 == NULL)
  56     return TD_NOTSD;
  57
  58   struct pthread_key_data level2;
  59   if (ps_pdread (th->th_ta_p->ph, &level1[idx2nd], &level2,
  60                  sizeof (level2)) != PS_OK)
  61     return TD_ERR;      /* XXX Other error value?  */
  62
  63   /* Check whether the data is valid.  */
  64   if (level2.seq != seq)
  65     return TD_NOTSD;
  66
  67   if (level2.data != NULL)
  68     *data = level2.data;
  69
  70   return TD_OK;
  71 }