1 | /* Validate a thread handle. |
2 | Copyright (C) 1999-2018 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, see |
18 | <http://www.gnu.org/licenses/>. */ |
19 | |
20 | #include "thread_dbP.h" |
21 | #include <stdbool.h> |
22 | |
23 | static td_err_e |
24 | check_thread_list (const td_thrhandle_t *th, psaddr_t head, bool *uninit) |
25 | { |
26 | td_err_e err; |
27 | psaddr_t next, ofs; |
28 | |
29 | err = DB_GET_FIELD (next, th->th_ta_p, head, list_t, next, 0); |
30 | if (err == TD_OK) |
31 | { |
32 | if (next == 0) |
33 | { |
34 | *uninit = true; |
35 | return TD_NOTHR; |
36 | } |
37 | err = DB_GET_FIELD_ADDRESS (ofs, th->th_ta_p, 0, pthread, list, 0); |
38 | } |
39 | |
40 | while (err == TD_OK) |
41 | { |
42 | if (next == head) |
43 | return TD_NOTHR; |
44 | |
45 | if (next - (ofs - (psaddr_t) 0) == th->th_unique) |
46 | return TD_OK; |
47 | |
48 | err = DB_GET_FIELD (next, th->th_ta_p, next, list_t, next, 0); |
49 | } |
50 | |
51 | return err; |
52 | } |
53 | |
54 | |
55 | td_err_e |
56 | td_thr_validate (const td_thrhandle_t *th) |
57 | { |
58 | td_err_e err; |
59 | psaddr_t list; |
60 | |
61 | LOG ("td_thr_validate" ); |
62 | |
63 | /* First check the list with threads using user allocated stacks. */ |
64 | bool uninit = false; |
65 | err = DB_GET_SYMBOL (list, th->th_ta_p, __stack_user); |
66 | if (err == TD_OK) |
67 | err = check_thread_list (th, list, &uninit); |
68 | |
69 | /* If our thread is not on this list search the list with stack |
70 | using implementation allocated stacks. */ |
71 | if (err == TD_NOTHR) |
72 | { |
73 | err = DB_GET_SYMBOL (list, th->th_ta_p, stack_used); |
74 | if (err == TD_OK) |
75 | err = check_thread_list (th, list, &uninit); |
76 | |
77 | if (err == TD_NOTHR && uninit && th->th_unique == 0) |
78 | /* __pthread_initialize_minimal has not run yet. |
79 | There is only the special case thread handle. */ |
80 | err = TD_OK; |
81 | } |
82 | |
83 | return err; |
84 | } |
85 | |