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d4697bc9 | 1 | /* Copyright (C) 2002-2014 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 | |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
76a50749 UD |
18 | |
19 | #include <stdlib.h> | |
20 | #include "pthreadP.h" | |
21 | ||
22 | ||
23 | void * | |
24 | __pthread_getspecific (key) | |
25 | pthread_key_t key; | |
26 | { | |
27 | struct pthread_key_data *data; | |
28 | ||
29 | /* Special case access to the first 2nd-level block. This is the | |
30 | usual case. */ | |
a1ffb40e | 31 | if (__glibc_likely (key < PTHREAD_KEY_2NDLEVEL_SIZE)) |
76a50749 UD |
32 | data = &THREAD_SELF->specific_1stblock[key]; |
33 | else | |
34 | { | |
35 | /* Verify the key is sane. */ | |
36 | if (key >= PTHREAD_KEYS_MAX) | |
37 | /* Not valid. */ | |
38 | return NULL; | |
39 | ||
40 | unsigned int idx1st = key / PTHREAD_KEY_2NDLEVEL_SIZE; | |
41 | unsigned int idx2nd = key % PTHREAD_KEY_2NDLEVEL_SIZE; | |
42 | ||
43 | /* If the sequence number doesn't match or the key cannot be defined | |
44 | for this thread since the second level array is not allocated | |
45 | return NULL, too. */ | |
46 | struct pthread_key_data *level2 = THREAD_GETMEM_NC (THREAD_SELF, | |
117c452c | 47 | specific, idx1st); |
76a50749 UD |
48 | if (level2 == NULL) |
49 | /* Not allocated, therefore no data. */ | |
50 | return NULL; | |
51 | ||
52 | /* There is data. */ | |
53 | data = &level2[idx2nd]; | |
54 | } | |
55 | ||
56 | void *result = data->data; | |
57 | if (result != NULL) | |
58 | { | |
59 | uintptr_t seq = data->seq; | |
60 | ||
a1ffb40e | 61 | if (__glibc_unlikely (seq != __pthread_keys[key].seq)) |
90491dc4 | 62 | result = data->data = NULL; |
76a50749 UD |
63 | } |
64 | ||
65 | return result; | |
66 | } | |
67 | strong_alias (__pthread_getspecific, pthread_getspecific) | |
4d17e683 | 68 | hidden_def (__pthread_getspecific) |