Update.
[glibc.git] / nptl_db / td_thr_validate.c
blob3d560a621b2032ad29941bc55d6cafcb51376396
1 /* Validate a thread handle.
2 Copyright (C) 1999, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@redhat.com>, 1999.
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.
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.
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. */
21 #include "thread_dbP.h"
22 #include <stdbool.h>
24 static td_err_e
25 check_thread_list (const td_thrhandle_t *th, psaddr_t head, bool *uninit)
27 td_err_e err;
28 psaddr_t next, ofs;
30 err = DB_GET_FIELD (next, th->th_ta_p, head, list_t, next, 0);
31 if (err == TD_OK)
33 if (next == 0)
35 *uninit = true;
36 return TD_NOTHR;
38 err = DB_GET_FIELD_ADDRESS (ofs, th->th_ta_p, 0, pthread, list, 0);
41 while (err == TD_OK)
43 if (next == head)
44 return TD_NOTHR;
46 if (next - (ofs - (psaddr_t) 0) == th->th_unique)
47 return TD_OK;
49 err = DB_GET_FIELD (next, th->th_ta_p, next, list_t, next, 0);
52 return err;
56 td_err_e
57 td_thr_validate (const td_thrhandle_t *th)
59 td_err_e err;
60 psaddr_t list;
62 LOG ("td_thr_validate");
64 /* First check the list with threads using user allocated stacks. */
65 bool uninit = false;
66 err = DB_GET_SYMBOL (list, th->th_ta_p, __stack_user);
67 if (err == TD_OK)
68 err = check_thread_list (th, list, &uninit);
70 /* If our thread is not on this list search the list with stack
71 using implementation allocated stacks. */
72 if (err == TD_NOTHR)
74 err = DB_GET_SYMBOL (list, th->th_ta_p, stack_used);
75 if (err == TD_OK)
76 err = check_thread_list (th, list, &uninit);
78 if (err == TD_NOTHR && uninit)
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;
90 return err;