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bfff8b1b | 1 | /* Copyright (C) 2002-2017 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 * | |
9d46370c | 24 | __pthread_getspecific (pthread_key_t key) |
76a50749 UD |
25 | { |
26 | struct pthread_key_data *data; | |
27 | ||
28 | /* Special case access to the first 2nd-level block. This is the | |
29 | usual case. */ | |
a1ffb40e | 30 | if (__glibc_likely (key < PTHREAD_KEY_2NDLEVEL_SIZE)) |
76a50749 UD |
31 | data = &THREAD_SELF->specific_1stblock[key]; |
32 | else | |
33 | { | |
34 | /* Verify the key is sane. */ | |
35 | if (key >= PTHREAD_KEYS_MAX) | |
36 | /* Not valid. */ | |
37 | return NULL; | |
38 | ||
39 | unsigned int idx1st = key / PTHREAD_KEY_2NDLEVEL_SIZE; | |
40 | unsigned int idx2nd = key % PTHREAD_KEY_2NDLEVEL_SIZE; | |
41 | ||
42 | /* If the sequence number doesn't match or the key cannot be defined | |
43 | for this thread since the second level array is not allocated | |
44 | return NULL, too. */ | |
45 | struct pthread_key_data *level2 = THREAD_GETMEM_NC (THREAD_SELF, | |
117c452c | 46 | specific, idx1st); |
76a50749 UD |
47 | if (level2 == NULL) |
48 | /* Not allocated, therefore no data. */ | |
49 | return NULL; | |
50 | ||
51 | /* There is data. */ | |
52 | data = &level2[idx2nd]; | |
53 | } | |
54 | ||
55 | void *result = data->data; | |
56 | if (result != NULL) | |
57 | { | |
58 | uintptr_t seq = data->seq; | |
59 | ||
a1ffb40e | 60 | if (__glibc_unlikely (seq != __pthread_keys[key].seq)) |
90491dc4 | 61 | result = data->data = NULL; |
76a50749 UD |
62 | } |
63 | ||
64 | return result; | |
65 | } | |
fa872e1b | 66 | weak_alias (__pthread_getspecific, pthread_getspecific) |
4d17e683 | 67 | hidden_def (__pthread_getspecific) |