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76a50749 | 1 | /* Get a thread-specific data pointer for a thread. |
7f08f55a | 2 | Copyright (C) 1999,2001,2002,2003 Free Software Foundation, Inc. |
76a50749 UD |
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 | { | |
7f08f55a RM |
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; | |
76a50749 | 31 | |
7f08f55a | 32 | LOG ("td_thr_tsd"); |
76a50749 UD |
33 | |
34 | /* Get the key entry. */ | |
7f08f55a RM |
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; | |
76a50749 UD |
40 | |
41 | /* Fail if this key is not at all used. */ | |
7f08f55a | 42 | if (((uintptr_t) tk_seq & 1) == 0) |
76a50749 UD |
43 | return TD_BADKEY; |
44 | ||
7f08f55a RM |
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; | |
76a50749 | 50 | |
7f08f55a RM |
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; | |
76a50749 UD |
64 | |
65 | /* Check the pointer to the second level array. */ | |
7f08f55a | 66 | if (level1 == 0) |
76a50749 UD |
67 | return TD_NOTSD; |
68 | ||
7f08f55a RM |
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; | |
76a50749 UD |
81 | |
82 | /* Check whether the data is valid. */ | |
7f08f55a RM |
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) | |
76a50749 UD |
87 | return TD_NOTSD; |
88 | ||
7f08f55a RM |
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; | |
76a50749 | 94 | |
7f08f55a | 95 | return err; |
76a50749 | 96 | } |