1 /* Which thread is running on an lwp?
2 Copyright (C) 1999, 2001, 2002 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.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
22
23 td_err_e
td_ta_map_lwp2thr(const td_thragent_t * ta,lwpid_t lwpid,td_thrhandle_t * th)24 td_ta_map_lwp2thr (const td_thragent_t *ta, lwpid_t lwpid, td_thrhandle_t *th)
25 {
26 int pthread_threads_max = ta->pthread_threads_max;
27 size_t sizeof_descr = ta->sizeof_descr;
28 struct pthread_handle_struct phc[pthread_threads_max];
29 size_t cnt;
30 #ifdef ALL_THREADS_STOPPED
31 int num;
32 #else
33 # define num 1
34 #endif
35
36 LOG ("td_ta_map_lwp2thr");
37
38 /* Test whether the TA parameter is ok. */
39 if (! ta_ok (ta))
40 return TD_BADTA;
41
42 /* Read all the descriptors. */
43 if (ps_pdread (ta->ph, ta->handles, phc,
44 sizeof (struct pthread_handle_struct) * pthread_threads_max)
45 != PS_OK)
46 return TD_ERR; /* XXX Other error value? */
47
48 #ifdef ALL_THREADS_STOPPED
49 /* Read the number of currently active threads. */
50 if (ps_pdread (ta->ph, ta->pthread_handles_num, &num, sizeof (int)) != PS_OK)
51 return TD_ERR; /* XXX Other error value? */
52 #endif
53
54 /* Get the entries one after the other and find out whether the ID
55 matches. */
56 for (cnt = 0; cnt < pthread_threads_max && num > 0; ++cnt)
57 if (phc[cnt].h_descr != NULL)
58 {
59 struct _pthread_descr_struct pds;
60
61 #ifdef ALL_THREADS_STOPPED
62 /* First count this active thread. */
63 --num;
64 #endif
65
66 if (ps_pdread (ta->ph, phc[cnt].h_descr, &pds, sizeof_descr) != PS_OK)
67 return TD_ERR; /* XXX Other error value? */
68
69 if ((pds.p_pid ?: ps_getpid (ta->ph)) == lwpid)
70 {
71 /* Found it. Now fill in the `td_thrhandle_t' object. */
72 th->th_ta_p = (td_thragent_t *) ta;
73 th->th_unique = phc[cnt].h_descr;
74
75 return TD_OK;
76 }
77 }
78 else if (cnt == 0)
79 {
80 /* The initial thread always exists. But it might not yet be
81 initialized. Construct a value. */
82 th->th_ta_p = (td_thragent_t *) ta;
83 th->th_unique = NULL;
84
85 return TD_OK;
86 }
87
88 return TD_NOLWP;
89 }
90