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96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
/* Get a thread-specific data pointer for a thread.
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Copyright (C) 1999-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdint.h>
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#include "thread_dbP.h"
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td_err_e
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td_thr_tsd (const td_thrhandle_t *th, const thread_key_t tk, void **data)
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{
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td_err_e err;
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psaddr_t tk_seq, level1, level2, seq, value;
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void *copy;
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uint32_t pthread_key_2ndlevel_size, idx1st, idx2nd;
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LOG ("td_thr_tsd");
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/* Get the key entry. */
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err = DB_GET_VALUE (tk_seq, th->th_ta_p, __pthread_keys, tk);
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if (err == TD_NOAPLIC)
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return TD_BADKEY;
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if (err != TD_OK)
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return err;
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/* Fail if this key is not at all used. */
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if (((uintptr_t) tk_seq & 1) == 0)
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return TD_BADKEY;
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/* This makes sure we have the size information on hand. */
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err = DB_GET_FIELD_ADDRESS (level2, th->th_ta_p, 0, pthread_key_data_level2,
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data, 1);
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if (err != TD_OK)
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return err;
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/* Compute the indices. */
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pthread_key_2ndlevel_size
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= DB_DESC_NELEM (th->th_ta_p->ta_field_pthread_key_data_level2_data);
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idx1st = tk / pthread_key_2ndlevel_size;
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idx2nd = tk % pthread_key_2ndlevel_size;
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/* Now fetch the first level pointer. */
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err = DB_GET_FIELD (level1, th->th_ta_p, th->th_unique, pthread,
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specific, idx1st);
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if (err == TD_NOAPLIC)
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return TD_DBERR;
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if (err != TD_OK)
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return err;
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/* Check the pointer to the second level array. */
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if (level1 == 0)
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return TD_NOTSD;
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/* Locate the element within the second level array. */
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err = DB_GET_FIELD_ADDRESS (level2, th->th_ta_p,
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level1, pthread_key_data_level2, data, idx2nd);
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if (err == TD_NOAPLIC)
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return TD_DBERR;
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if (err != TD_OK)
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return err;
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/* Now copy in that whole structure. */
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err = DB_GET_STRUCT (copy, th->th_ta_p, level2, pthread_key_data);
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if (err != TD_OK)
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return err;
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/* Check whether the data is valid. */
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err = DB_GET_FIELD_LOCAL (seq, th->th_ta_p, copy, pthread_key_data, seq, 0);
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if (err != TD_OK)
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return err;
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if (seq != tk_seq)
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return TD_NOTSD;
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/* Finally, fetch the value. */
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err = DB_GET_FIELD_LOCAL (value, th->th_ta_p, copy, pthread_key_data,
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data, 0);
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if (err == TD_OK)
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*data = value;
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return err;
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}
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