1 | /* pthread_mutex_consistent. Hurd version. |
2 | Copyright (C) 2016-2024 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
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 | <https://www.gnu.org/licenses/>. */ |
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) |
48 | |