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76a50749 | 1 | /* Validate a thread handle. |
090addb4 | 2 | Copyright (C) 1999, 2001, 2002, 2003, 2004 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" | |
090addb4 | 22 | #include <stdbool.h> |
76a50749 UD |
23 | |
24 | static td_err_e | |
090addb4 | 25 | check_thread_list (const td_thrhandle_t *th, psaddr_t head, bool *uninit) |
76a50749 | 26 | { |
7f08f55a RM |
27 | td_err_e err; |
28 | psaddr_t next, ofs; | |
29 | ||
30 | err = DB_GET_FIELD (next, th->th_ta_p, head, list_t, next, 0); | |
31 | if (err == TD_OK) | |
32 | { | |
33 | if (next == 0) | |
090addb4 RM |
34 | { |
35 | *uninit = true; | |
36 | return TD_NOTHR; | |
37 | } | |
7f08f55a RM |
38 | err = DB_GET_FIELD_ADDRESS (ofs, th->th_ta_p, 0, pthread, list, 0); |
39 | } | |
40 | ||
41 | while (err == TD_OK) | |
42 | { | |
43 | if (next == head) | |
44 | return TD_NOTHR; | |
45 | ||
46 | if (next - (ofs - (psaddr_t) 0) == th->th_unique) | |
47 | return TD_OK; | |
48 | ||
49 | err = DB_GET_FIELD (next, th->th_ta_p, next, list_t, next, 0); | |
50 | } | |
51 | ||
52 | return err; | |
76a50749 UD |
53 | } |
54 | ||
55 | ||
56 | td_err_e | |
57 | td_thr_validate (const td_thrhandle_t *th) | |
58 | { | |
7f08f55a RM |
59 | td_err_e err; |
60 | psaddr_t list; | |
61 | ||
76a50749 UD |
62 | LOG ("td_thr_validate"); |
63 | ||
64 | /* First check the list with threads using user allocated stacks. */ | |
090addb4 | 65 | bool uninit = false; |
7f08f55a RM |
66 | err = DB_GET_SYMBOL (list, th->th_ta_p, __stack_user); |
67 | if (err == TD_OK) | |
090addb4 | 68 | err = check_thread_list (th, list, &uninit); |
76a50749 UD |
69 | |
70 | /* If our thread is not on this list search the list with stack | |
71 | using implementation allocated stacks. */ | |
7f08f55a RM |
72 | if (err == TD_NOTHR) |
73 | { | |
74 | err = DB_GET_SYMBOL (list, th->th_ta_p, stack_used); | |
75 | if (err == TD_OK) | |
090addb4 RM |
76 | err = check_thread_list (th, list, &uninit); |
77 | ||
78 | if (err == TD_NOTHR && uninit) | |
79 | { | |
80 | /* __pthread_initialize_minimal has not run yet. | |
81 | But the main thread still has a valid ID. */ | |
82 | td_thrhandle_t main_th; | |
83 | err = td_ta_map_lwp2thr (th->th_ta_p, | |
84 | ps_getpid (th->th_ta_p->ph), &main_th); | |
85 | if (err == TD_OK && th->th_unique != main_th.th_unique) | |
86 | err = TD_NOTHR; | |
87 | } | |
7f08f55a | 88 | } |
76a50749 | 89 | |
7f08f55a | 90 | return err; |
76a50749 | 91 | } |