1: /* Get a thread-specific data pointer for a thread.
    2:    Copyright (C) 1999,2001,2002,2003 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:   td_err_e err;
   28:   psaddr_t tk_seq, level1, level2, seq, value;
   29:   void *copy;
   30:   uint32_t pthread_key_2ndlevel_size, idx1st, idx2nd;
   31: 
   32:   LOG ("td_thr_tsd");
   33: 
   34:   /* Get the key entry.  */
   35:   err = DB_GET_VALUE (tk_seq, th->th_ta_p, __pthread_keys, tk);
   36:   if (err == TD_NOAPLIC)
   37:     return TD_BADKEY;
   38:   if (err != TD_OK)
   39:     return err;
   40: 
   41:   /* Fail if this key is not at all used.  */
   42:   if (((uintptr_t) tk_seq & 1) == 0)
   43:     return TD_BADKEY;
   44: 
   45:   /* This makes sure we have the size information on hand.  */
   46:   err = DB_GET_FIELD_ADDRESS (level2, th->th_ta_p, 0, pthread_key_data_level2,
   47:                               data, 1);
   48:   if (err != TD_OK)
   49:     return err;
   50: 
   51:   /* Compute the indeces.  */
   52:   pthread_key_2ndlevel_size
   53:     = DB_DESC_NELEM (th->th_ta_p->ta_field_pthread_key_data_level2_data);
   54:   idx1st = tk / pthread_key_2ndlevel_size;
   55:   idx2nd = tk % pthread_key_2ndlevel_size;
   56: 
   57:   /* Now fetch the first level pointer.  */
   58:   err = DB_GET_FIELD (level1, th->th_ta_p, th->th_unique, pthread,
   59:                       specific, idx1st);
   60:   if (err == TD_NOAPLIC)
   61:     return TD_DBERR;
   62:   if (err != TD_OK)
   63:     return err;
   64: 
   65:   /* Check the pointer to the second level array.  */
   66:   if (level1 == 0)
   67:     return TD_NOTSD;
   68: 
   69:   /* Locate the element within the second level array.  */
   70:   err = DB_GET_FIELD_ADDRESS (level2, th->th_ta_p,
   71:                               level1, pthread_key_data_level2, data, idx2nd);
   72:   if (err == TD_NOAPLIC)
   73:     return TD_DBERR;
   74:   if (err != TD_OK)
   75:     return err;
   76: 
   77:   /* Now copy in that whole structure.  */
   78:   err = DB_GET_STRUCT (copy, th->th_ta_p, level2, pthread_key_data);
   79:   if (err != TD_OK)
   80:     return err;
   81: 
   82:   /* Check whether the data is valid.  */
   83:   err = DB_GET_FIELD_LOCAL (seq, th->th_ta_p, copy, pthread_key_data, seq, 0);
   84:   if (err != TD_OK)
   85:     return err;
   86:   if (seq != tk_seq)
   87:     return TD_NOTSD;
   88: 
   89:   /* Finally, fetch the value.  */
   90:   err = DB_GET_FIELD_LOCAL (value, th->th_ta_p, copy, pthread_key_data,
   91:                             data, 0);
   92:   if (err == TD_OK)
   93:     *data = value;
   94: 
   95:   return err;
   96: }