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b168057a | 1 | /* Copyright (C) 2002-2015 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/>. */ | |
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18 | |
19 | #include <errno.h> | |
20 | #include "pthreadP.h" | |
21 | #include <atomic.h> | |
22 | ||
23 | ||
24 | int | |
25 | pthread_detach (th) | |
26 | pthread_t th; | |
27 | { | |
28 | struct pthread *pd = (struct pthread *) th; | |
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29 | |
30 | /* Make sure the descriptor is valid. */ | |
69b35e86 | 31 | if (INVALID_NOT_TERMINATED_TD_P (pd)) |
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32 | /* Not a valid thread handle. */ |
33 | return ESRCH; | |
34 | ||
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35 | int result = 0; |
36 | ||
37 | /* Mark the thread as detached. */ | |
5a3ab2fc | 38 | if (atomic_compare_and_exchange_bool_acq (&pd->joinid, pd, NULL)) |
76a50749 UD |
39 | { |
40 | /* There are two possibilities here. First, the thread might | |
41 | already be detached. In this case we return EINVAL. | |
42 | Otherwise there might already be a waiter. The standard does | |
43 | not mention what happens in this case. */ | |
44 | if (IS_DETACHED (pd)) | |
45 | result = EINVAL; | |
46 | } | |
47 | else | |
48 | /* Check whether the thread terminated meanwhile. In this case we | |
49 | will just free the TCB. */ | |
50 | if ((pd->cancelhandling & EXITING_BITMASK) != 0) | |
51 | /* Note that the code in __free_tcb makes sure each thread | |
52 | control block is freed only once. */ | |
53 | __free_tcb (pd); | |
54 | ||
55 | return result; | |
56 | } |