/* Get a thread-specific data pointer for a thread.

   Copyright (C) 1999-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@redhat.com>, 1999.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <stdint.h>

#include "thread_dbP.h"

td_err_e

td_thr_tsd (const td_thrhandle_t *th, const thread_key_t tk, void **data)

{

  td_err_e err;

  psaddr_t tk_seq, level1, level2, seq, value;

  void *copy;

  uint32_t pthread_key_2ndlevel_size, idx1st, idx2nd;

  LOG ("td_thr_tsd");

  /* Get the key entry.  */

  err = DB_GET_VALUE (tk_seq, th->th_ta_p, __pthread_keys, tk);

  if (err == TD_NOAPLIC)

    return TD_BADKEY;

  if (err != TD_OK)

    return err;

  /* Fail if this key is not at all used.  */

  if (((uintptr_t) tk_seq & 1) == 0)

    return TD_BADKEY;

  /* This makes sure we have the size information on hand.  */

  err = DB_GET_FIELD_ADDRESS (level2, th->th_ta_p, 0, pthread_key_data_level2,

			      data, 1);

  if (err != TD_OK)

    return err;

  /* Compute the indeces.  */

  pthread_key_2ndlevel_size

    = DB_DESC_NELEM (th->th_ta_p->ta_field_pthread_key_data_level2_data);

  idx1st = tk / pthread_key_2ndlevel_size;

  idx2nd = tk % pthread_key_2ndlevel_size;

  /* Now fetch the first level pointer.  */

  err = DB_GET_FIELD (level1, th->th_ta_p, th->th_unique, pthread,

		      specific, idx1st);

  if (err == TD_NOAPLIC)

    return TD_DBERR;

  if (err != TD_OK)

    return err;

  /* Check the pointer to the second level array.  */

  if (level1 == 0)

    return TD_NOTSD;

  /* Locate the element within the second level array.  */

  err = DB_GET_FIELD_ADDRESS (level2, th->th_ta_p,

			      level1, pthread_key_data_level2, data, idx2nd);

  if (err == TD_NOAPLIC)

    return TD_DBERR;

  if (err != TD_OK)

    return err;

  /* Now copy in that whole structure.  */

  err = DB_GET_STRUCT (copy, th->th_ta_p, level2, pthread_key_data);

  if (err != TD_OK)

    return err;

  /* Check whether the data is valid.  */

  err = DB_GET_FIELD_LOCAL (seq, th->th_ta_p, copy, pthread_key_data, seq, 0);

  if (err != TD_OK)

    return err;

  if (seq != tk_seq)

    return TD_NOTSD;

  /* Finally, fetch the value.  */

  err = DB_GET_FIELD_LOCAL (value, th->th_ta_p, copy, pthread_key_data,

			    data, 0);

  if (err == TD_OK)

    *data = value;

  return err;

}