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.
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, see
18 <http://www.gnu.org/licenses/>. */
20 #include "thread_dbP.h"
24 td_thr_tsd (const td_thrhandle_t
*th
, const thread_key_t tk
, void **data
)
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
;
37 /* If there is no thread descriptor there cannot be any thread
39 if (th
->th_unique
== NULL
)
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? */
47 /* Check correct value of key. */
48 if (tk
>= pthread_keys_max
)
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? */
56 /* Fail if this key is not at all used. */
60 /* Compute the indeces. */
61 idx1st
= tk
/ pthread_key_2ndlevel_size
;
62 idx2nd
= tk
% pthread_key_2ndlevel_size
;
64 /* Check the pointer to the second level array. */
65 if (pds
.p_specific
[idx1st
] == NULL
)
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
)
79 return p
!= NULL
? TD_OK
: TD_NOTSD
;