| 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 <errno.h> |
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| 19 | #include "pthreadP.h" |
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| 20 | #include <atomic.h> |
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| 21 | #include <shlib-compat.h> |
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| 22 | |
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| 23 | int |
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| 24 | ___pthread_key_create (pthread_key_t *key, void (*destr) (void *)) |
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| 25 | { |
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| 26 | /* Find a slot in __pthread_keys which is unused. */ |
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| 27 | for (size_t cnt = 0; cnt < PTHREAD_KEYS_MAX; ++cnt) |
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| 28 | { |
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| 29 | uintptr_t seq = __pthread_keys[cnt].seq; |
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| 30 | |
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| 31 | if (KEY_UNUSED (seq) && KEY_USABLE (seq) |
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| 32 | /* We found an unused slot. Try to allocate it. */ |
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| 33 | && ! atomic_compare_and_exchange_bool_acq (&__pthread_keys[cnt].seq, |
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| 34 | seq + 1, seq)) |
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| 35 | { |
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| 36 | /* Remember the destructor. */ |
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| 37 | __pthread_keys[cnt].destr = destr; |
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| 38 | |
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| 39 | /* Return the key to the caller. */ |
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| 40 | *key = cnt; |
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| 41 | |
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| 42 | /* The call succeeded. */ |
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| 43 | return 0; |
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| 44 | } |
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| 45 | } |
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| 46 | |
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| 47 | return EAGAIN; |
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| 48 | } |
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| 49 | versioned_symbol (libc, ___pthread_key_create, __pthread_key_create, |
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| 50 | GLIBC_2_34); |
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| 51 | libc_hidden_ver (___pthread_key_create, __pthread_key_create) |
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| 52 | |
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| 53 | versioned_symbol (libc, ___pthread_key_create, pthread_key_create, |
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| 54 | GLIBC_2_34); |
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| 55 | #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_34) |
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| 56 | compat_symbol (libpthread, ___pthread_key_create, __pthread_key_create, |
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| 57 | GLIBC_2_0); |
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| 58 | compat_symbol (libpthread, ___pthread_key_create, pthread_key_create, |
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| 59 | GLIBC_2_0); |
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| 60 | #endif |
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| 61 | |
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