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- /* Get a thread-specific data pointer for a thread.
- Copyright (C) 1999,2001,2002,2003 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 "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;
- }
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