1 /* Get a thread-specific data pointer for a thread.
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_thr_tsd(const td_thrhandle_t * th,const thread_key_t tk,void ** data)24 td_thr_tsd (const td_thrhandle_t *th, const thread_key_t tk, void **data)
25 {
26 struct _pthread_descr_struct pds;
27 struct pthread_key_struct *keys = th->th_ta_p->keys;
28 struct pthread_key_struct key;
29 int pthread_keys_max = th->th_ta_p->pthread_keys_max;
30 int pthread_key_2ndlevel_size = th->th_ta_p->pthread_key_2ndlevel_size;
31 unsigned int idx1st;
32 unsigned int idx2nd;
33 void *p;
34
35 LOG ("td_thr_tsd");
36
37 /* If there is no thread descriptor there cannot be any thread
38 specific data. */
39 if (th->th_unique == NULL)
40 return TD_BADKEY;
41
42 /* Get the thread descriptor. */
43 if (ps_pdread (th->th_ta_p->ph, th->th_unique, &pds,
44 sizeof (struct _pthread_descr_struct)) != PS_OK)
45 return TD_ERR; /* XXX Other error value? */
46
47 /* Check correct value of key. */
48 if (tk >= pthread_keys_max)
49 return TD_BADKEY;
50
51 /* Get the key entry. */
52 if (ps_pdread (th->th_ta_p->ph, &keys[tk], &key,
53 sizeof (struct pthread_key_struct)) != PS_OK)
54 return TD_ERR; /* XXX Other error value? */
55
56 /* Fail if this key is not at all used. */
57 if (! key.in_use)
58 return TD_BADKEY;
59
60 /* Compute the indeces. */
61 idx1st = tk / pthread_key_2ndlevel_size;
62 idx2nd = tk % pthread_key_2ndlevel_size;
63
64 /* Check the pointer to the second level array. */
65 if (pds.p_specific[idx1st] == NULL)
66 return TD_NOTSD;
67
68 /* Now get the real key.
69 XXX I don't know whether it's correct but there is currently no
70 easy way to determine whether a key was never set or the value
71 is NULL. We return an error whenever the value is NULL. */
72 if (ps_pdread (th->th_ta_p->ph, &pds.p_specific[idx1st][idx2nd], &p,
73 sizeof (void *)) != PS_OK)
74 return TD_ERR;
75
76 if (p != NULL)
77 *data = p;
78
79 return p != NULL ? TD_OK : TD_NOTSD;
80 }
81