| 1 | /* Copyright (C) 2002-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #include <stdlib.h> |
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| 19 | #include "pthreadP.h" |
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| 20 | #include <shlib-compat.h> |
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| 21 | |
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| 22 | void * |
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| 23 | ___pthread_getspecific (pthread_key_t key) |
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| 24 | { |
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| 25 | struct pthread_key_data *data; |
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| 26 | |
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| 27 | /* Special case access to the first 2nd-level block. This is the |
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| 28 | usual case. */ |
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| 29 | if (__glibc_likely (key < PTHREAD_KEY_2NDLEVEL_SIZE)) |
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| 30 | data = &THREAD_SELF->specific_1stblock[key]; |
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| 31 | else |
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| 32 | { |
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| 33 | /* Verify the key is sane. */ |
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| 34 | if (key >= PTHREAD_KEYS_MAX) |
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| 35 | /* Not valid. */ |
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| 36 | return NULL; |
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| 37 | |
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| 38 | unsigned int idx1st = key / PTHREAD_KEY_2NDLEVEL_SIZE; |
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| 39 | unsigned int idx2nd = key % PTHREAD_KEY_2NDLEVEL_SIZE; |
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| 40 | |
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| 41 | /* If the sequence number doesn't match or the key cannot be defined |
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| 42 | for this thread since the second level array is not allocated |
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| 43 | return NULL, too. */ |
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| 44 | struct pthread_key_data *level2 = THREAD_GETMEM_NC (THREAD_SELF, |
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| 45 | specific, idx1st); |
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| 46 | if (level2 == NULL) |
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| 47 | /* Not allocated, therefore no data. */ |
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| 48 | return NULL; |
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| 49 | |
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| 50 | /* There is data. */ |
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| 51 | data = &level2[idx2nd]; |
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| 52 | } |
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| 53 | |
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| 54 | void *result = data->data; |
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| 55 | if (result != NULL) |
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| 56 | { |
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| 57 | uintptr_t seq = data->seq; |
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| 58 | |
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| 59 | if (__glibc_unlikely (seq != __pthread_keys[key].seq)) |
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| 60 | result = data->data = NULL; |
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| 61 | } |
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| 62 | |
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| 63 | return result; |
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| 64 | } |
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| 65 | versioned_symbol (libc, ___pthread_getspecific, pthread_getspecific, |
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| 66 | GLIBC_2_34); |
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| 67 | libc_hidden_ver (___pthread_getspecific, __pthread_getspecific) |
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| 68 | #ifndef SHARED |
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| 69 | strong_alias (___pthread_getspecific, __pthread_getspecific) |
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| 70 | #endif |
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| 71 | |
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| 72 | #if OTHER_SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_34) |
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| 73 | compat_symbol (libpthread, ___pthread_getspecific, __pthread_getspecific, |
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| 74 | GLIBC_2_0); |
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| 75 | compat_symbol (libpthread, ___pthread_getspecific, pthread_getspecific, |
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| 76 | GLIBC_2_0); |
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| 77 | #endif |
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| 78 | |
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