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33574c17 ST |
1 | /* pthread_mutex_consistent. Hurd version. |
2 | Copyright (C) 2016-2018 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | ||
ad2b41bf ST |
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. | |
33574c17 | 9 | |
ad2b41bf | 10 | The GNU C Library is distributed in the hope that it will be useful, |
33574c17 | 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
ad2b41bf ST |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. | |
33574c17 | 14 | |
ad2b41bf ST |
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/>. */ | |
33574c17 ST |
18 | |
19 | #include <pthread.h> | |
20 | #include <stdlib.h> | |
21 | #include <assert.h> | |
22 | #include <pt-internal.h> | |
23 | #include "pt-mutex.h" | |
24 | #include <hurdlock.h> | |
25 | ||
26 | int | |
27 | pthread_mutex_consistent (pthread_mutex_t *mtxp) | |
28 | { | |
29 | int ret = EINVAL; | |
30 | unsigned int val = mtxp->__lock; | |
31 | ||
32 | if ((mtxp->__flags & PTHREAD_MUTEX_ROBUST) != 0 && | |
33 | (val & LLL_DEAD_OWNER) != 0 && | |
34 | atomic_compare_and_exchange_bool_acq (&mtxp->__lock, | |
35 | __getpid () | LLL_WAITERS, | |
36 | val) == 0) | |
37 | { | |
38 | /* The mutex is now ours, and it's consistent. */ | |
39 | mtxp->__owner_id = _pthread_self ()->thread; | |
40 | mtxp->__cnt = 1; | |
41 | ret = 0; | |
42 | } | |
43 | ||
44 | return ret; | |
45 | } | |
46 | ||
47 | weak_alias (pthread_mutex_consistent, pthread_mutex_consistent_np) |