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73e9ae88 | 1 | /* Copyright (C) 2002, 2003 Free Software Foundation, Inc. |
76a50749 UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
19 | ||
20 | #include <stdlib.h> | |
21 | #include "pthreadP.h" | |
22 | ||
23 | ||
24 | void * | |
25 | __pthread_getspecific (key) | |
26 | pthread_key_t key; | |
27 | { | |
28 | struct pthread_key_data *data; | |
29 | ||
30 | /* Special case access to the first 2nd-level block. This is the | |
31 | usual case. */ | |
32 | if (__builtin_expect (key < PTHREAD_KEY_2NDLEVEL_SIZE, 1)) | |
33 | data = &THREAD_SELF->specific_1stblock[key]; | |
34 | else | |
35 | { | |
36 | /* Verify the key is sane. */ | |
37 | if (key >= PTHREAD_KEYS_MAX) | |
38 | /* Not valid. */ | |
39 | return NULL; | |
40 | ||
41 | unsigned int idx1st = key / PTHREAD_KEY_2NDLEVEL_SIZE; | |
42 | unsigned int idx2nd = key % PTHREAD_KEY_2NDLEVEL_SIZE; | |
43 | ||
44 | /* If the sequence number doesn't match or the key cannot be defined | |
45 | for this thread since the second level array is not allocated | |
46 | return NULL, too. */ | |
47 | struct pthread_key_data *level2 = THREAD_GETMEM_NC (THREAD_SELF, | |
117c452c | 48 | specific, idx1st); |
76a50749 UD |
49 | if (level2 == NULL) |
50 | /* Not allocated, therefore no data. */ | |
51 | return NULL; | |
52 | ||
53 | /* There is data. */ | |
54 | data = &level2[idx2nd]; | |
55 | } | |
56 | ||
57 | void *result = data->data; | |
58 | if (result != NULL) | |
59 | { | |
60 | uintptr_t seq = data->seq; | |
61 | ||
90491dc4 UD |
62 | if (__builtin_expect (seq != __pthread_keys[key].seq, 0)) |
63 | result = data->data = NULL; | |
76a50749 UD |
64 | } |
65 | ||
66 | return result; | |
67 | } | |
68 | strong_alias (__pthread_getspecific, pthread_getspecific) | |
73e9ae88 | 69 | strong_alias (__pthread_getspecific, __pthread_getspecific_internal) |