1 /* Which thread is running on an lwp?
2 Copyright (C) 1999 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, 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"
22
23
24 td_err_e
td_ta_map_lwp2thr(const td_thragent_t * ta,lwpid_t lwpid,td_thrhandle_t * th)25 td_ta_map_lwp2thr (const td_thragent_t *ta, lwpid_t lwpid, td_thrhandle_t *th)
26 {
27 int pthread_threads_max = ta->pthread_threads_max;
28 size_t sizeof_descr = ta->sizeof_descr;
29 struct pthread_handle_struct phc[pthread_threads_max];
30 size_t cnt;
31 #ifdef ALL_THREADS_STOPPED
32 int num;
33 #else
34 # define num 1
35 #endif
36
37 LOG ("td_ta_map_lwp2thr");
38
39 /* Test whether the TA parameter is ok. */
40 if (! ta_ok (ta))
41 return TD_BADTA;
42
43 /* Read all the descriptors. */
44 if (ps_pdread (ta->ph, ta->handles, phc,
45 sizeof (struct pthread_handle_struct) * pthread_threads_max)
46 != PS_OK)
47 return TD_ERR; /* XXX Other error value? */
48
49 #ifdef ALL_THREADS_STOPPED
50 /* Read the number of currently active threads. */
51 if (ps_pdread (ta->ph, ta->pthread_handles_num, &num, sizeof (int)) != PS_OK)
52 return TD_ERR; /* XXX Other error value? */
53 #endif
54
55 /* Get the entries one after the other and find out whether the ID
56 matches. */
57 for (cnt = 0; cnt < pthread_threads_max && num > 0; ++cnt)
58 if (phc[cnt].h_descr != NULL)
59 {
60 struct _pthread_descr_struct pds;
61
62 #ifdef ALL_THREADS_STOPPED
63 /* First count this active thread. */
64 --num;
65 #endif
66
67 if (ps_pdread (ta->ph, phc[cnt].h_descr, &pds, sizeof_descr) != PS_OK)
68 return TD_ERR; /* XXX Other error value? */
69
70 if ((pds.p_pid ?: ps_getpid (ta->ph)) == lwpid)
71 {
72 /* Found it. Now fill in the `td_thrhandle_t' object. */
73 th->th_ta_p = (td_thragent_t *) ta;
74 th->th_unique = phc[cnt].h_descr;
75
76 return TD_OK;
77 }
78 }
79
80 return TD_NOLWP;
81 }
82