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4d17e683 | 1 | /* Copyright (C) 2002-2012 Free Software Foundation, Inc. |
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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/>. */ | |
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18 | |
19 | #include <errno.h> | |
20 | #include "pthreadP.h" | |
04974d63 | 21 | #include <atomic.h> |
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22 | |
23 | ||
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24 | int |
25 | __pthread_key_create (key, destr) | |
26 | pthread_key_t *key; | |
27 | void (*destr) (void *); | |
28 | { | |
76a50749 | 29 | /* Find a slot in __pthread_kyes which is unused. */ |
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30 | for (size_t cnt = 0; cnt < PTHREAD_KEYS_MAX; ++cnt) |
31 | { | |
32 | uintptr_t seq = __pthread_keys[cnt].seq; | |
33 | ||
34 | if (KEY_UNUSED (seq) && KEY_USABLE (seq) | |
35 | /* We found an unused slot. Try to allocate it. */ | |
36 | && ! atomic_compare_and_exchange_bool_acq (&__pthread_keys[cnt].seq, | |
37 | seq + 1, seq)) | |
38 | { | |
39 | /* Remember the destructor. */ | |
40 | __pthread_keys[cnt].destr = destr; | |
41 | ||
42 | /* Return the key to the caller. */ | |
43 | *key = cnt; | |
44 | ||
45 | /* The call succeeded. */ | |
46 | return 0; | |
47 | } | |
48 | } | |
49 | ||
50 | return EAGAIN; | |
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51 | } |
52 | strong_alias (__pthread_key_create, pthread_key_create) | |
4d17e683 | 53 | hidden_def (__pthread_key_create) |