| xf.li | bfc6e71 | 2025-02-07 01:54:34 -0800 | [diff] [blame^] | 1 | /* Copyright (C) 2002-2016 Free Software Foundation, Inc. |
| 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, see |
| 17 | <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include <errno.h> |
| 20 | #include "pthreadP.h" |
| 21 | #include <atomic.h> |
| 22 | |
| 23 | |
| 24 | int |
| 25 | __pthread_key_create (pthread_key_t *key, void (*destr) (void *)) |
| 26 | { |
| 27 | /* Find a slot in __pthread_keys which is unused. */ |
| 28 | for (size_t cnt = 0; cnt < PTHREAD_KEYS_MAX; ++cnt) |
| 29 | { |
| 30 | uintptr_t seq = __pthread_keys[cnt].seq; |
| 31 | |
| 32 | if (KEY_UNUSED (seq) && KEY_USABLE (seq) |
| 33 | /* We found an unused slot. Try to allocate it. */ |
| 34 | && ! atomic_compare_and_exchange_bool_acq (&__pthread_keys[cnt].seq, |
| 35 | seq + 1, seq)) |
| 36 | { |
| 37 | /* Remember the destructor. */ |
| 38 | __pthread_keys[cnt].destr = destr; |
| 39 | |
| 40 | /* Return the key to the caller. */ |
| 41 | *key = cnt; |
| 42 | |
| 43 | /* The call succeeded. */ |
| 44 | return 0; |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | return EAGAIN; |
| 49 | } |
| 50 | strong_alias (__pthread_key_create, pthread_key_create) |
| 51 | hidden_def (__pthread_key_create) |