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76a50749 | 1 | /* Get a thread-specific data pointer for a thread. |
581c785b | 2 | Copyright (C) 1999-2022 Free Software Foundation, Inc. |
76a50749 | 3 | This file is part of the GNU C Library. |
76a50749 UD |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
76a50749 | 18 | |
e054f494 | 19 | #include <stdint.h> |
76a50749 UD |
20 | #include "thread_dbP.h" |
21 | ||
22 | ||
23 | td_err_e | |
24 | td_thr_tsd (const td_thrhandle_t *th, const thread_key_t tk, void **data) | |
25 | { | |
7f08f55a RM |
26 | td_err_e err; |
27 | psaddr_t tk_seq, level1, level2, seq, value; | |
28 | void *copy; | |
29 | uint32_t pthread_key_2ndlevel_size, idx1st, idx2nd; | |
76a50749 | 30 | |
7f08f55a | 31 | LOG ("td_thr_tsd"); |
76a50749 UD |
32 | |
33 | /* Get the key entry. */ | |
7f08f55a RM |
34 | err = DB_GET_VALUE (tk_seq, th->th_ta_p, __pthread_keys, tk); |
35 | if (err == TD_NOAPLIC) | |
36 | return TD_BADKEY; | |
37 | if (err != TD_OK) | |
38 | return err; | |
76a50749 UD |
39 | |
40 | /* Fail if this key is not at all used. */ | |
7f08f55a | 41 | if (((uintptr_t) tk_seq & 1) == 0) |
76a50749 UD |
42 | return TD_BADKEY; |
43 | ||
7f08f55a RM |
44 | /* This makes sure we have the size information on hand. */ |
45 | err = DB_GET_FIELD_ADDRESS (level2, th->th_ta_p, 0, pthread_key_data_level2, | |
46 | data, 1); | |
47 | if (err != TD_OK) | |
48 | return err; | |
76a50749 | 49 | |
14ef9c18 | 50 | /* Compute the indices. */ |
7f08f55a RM |
51 | pthread_key_2ndlevel_size |
52 | = DB_DESC_NELEM (th->th_ta_p->ta_field_pthread_key_data_level2_data); | |
53 | idx1st = tk / pthread_key_2ndlevel_size; | |
54 | idx2nd = tk % pthread_key_2ndlevel_size; | |
55 | ||
56 | /* Now fetch the first level pointer. */ | |
57 | err = DB_GET_FIELD (level1, th->th_ta_p, th->th_unique, pthread, | |
58 | specific, idx1st); | |
59 | if (err == TD_NOAPLIC) | |
60 | return TD_DBERR; | |
61 | if (err != TD_OK) | |
62 | return err; | |
76a50749 UD |
63 | |
64 | /* Check the pointer to the second level array. */ | |
7f08f55a | 65 | if (level1 == 0) |
76a50749 UD |
66 | return TD_NOTSD; |
67 | ||
7f08f55a RM |
68 | /* Locate the element within the second level array. */ |
69 | err = DB_GET_FIELD_ADDRESS (level2, th->th_ta_p, | |
70 | level1, pthread_key_data_level2, data, idx2nd); | |
71 | if (err == TD_NOAPLIC) | |
72 | return TD_DBERR; | |
73 | if (err != TD_OK) | |
74 | return err; | |
75 | ||
76 | /* Now copy in that whole structure. */ | |
77 | err = DB_GET_STRUCT (copy, th->th_ta_p, level2, pthread_key_data); | |
78 | if (err != TD_OK) | |
79 | return err; | |
76a50749 UD |
80 | |
81 | /* Check whether the data is valid. */ | |
7f08f55a RM |
82 | err = DB_GET_FIELD_LOCAL (seq, th->th_ta_p, copy, pthread_key_data, seq, 0); |
83 | if (err != TD_OK) | |
84 | return err; | |
85 | if (seq != tk_seq) | |
76a50749 UD |
86 | return TD_NOTSD; |
87 | ||
7f08f55a RM |
88 | /* Finally, fetch the value. */ |
89 | err = DB_GET_FIELD_LOCAL (value, th->th_ta_p, copy, pthread_key_data, | |
90 | data, 0); | |
91 | if (err == TD_OK) | |
92 | *data = value; | |
76a50749 | 93 | |
7f08f55a | 94 | return err; |
76a50749 | 95 | } |