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83 lines
2.7 KiB
C
83 lines
2.7 KiB
C
/* Get a thread-specific data pointer for a thread.
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Copyright (C) 1999, 2001, 2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999.
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include "thread_dbP.h"
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#include <linuxthreads/internals.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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struct _pthread_descr_struct pds;
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struct pthread_key_struct *keys = th->th_ta_p->keys;
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struct pthread_key_struct key;
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int pthread_keys_max = th->th_ta_p->pthread_keys_max;
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int pthread_key_2ndlevel_size = th->th_ta_p->pthread_key_2ndlevel_size;
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unsigned int idx1st;
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unsigned int idx2nd;
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void *p;
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LOG ("td_thr_tsd");
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/* If there is no thread descriptor there cannot be any thread
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specific data. */
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if (th->th_unique == NULL)
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return TD_BADKEY;
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/* Get the thread descriptor. */
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if (ps_pdread (th->th_ta_p->ph, th->th_unique, &pds,
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sizeof (struct _pthread_descr_struct)) != PS_OK)
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return TD_ERR; /* XXX Other error value? */
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/* Check correct value of key. */
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if (tk >= pthread_keys_max)
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return TD_BADKEY;
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/* Get the key entry. */
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if (ps_pdread (th->th_ta_p->ph, &keys[tk], &key,
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sizeof (struct pthread_key_struct)) != PS_OK)
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return TD_ERR; /* XXX Other error value? */
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/* Fail if this key is not at all used. */
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if (! key.in_use)
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return TD_BADKEY;
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/* Compute the indeces. */
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idx1st = tk / pthread_key_2ndlevel_size;
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idx2nd = tk % pthread_key_2ndlevel_size;
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/* Check the pointer to the second level array. */
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if (pds.p_specific[idx1st] == NULL)
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return TD_NOTSD;
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/* Now get the real key.
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XXX I don't know whether it's correct but there is currently no
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easy way to determine whether a key was never set or the value
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is NULL. We return an error whenever the value is NULL. */
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if (ps_pdread (th->th_ta_p->ph, &pds.p_specific[idx1st][idx2nd], &p,
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sizeof (void *)) != PS_OK)
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return TD_ERR;
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if (p != NULL)
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*data = p;
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return p != NULL ? TD_OK : TD_NOTSD;
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}
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