| 1 | /* pthread_mutex_consistent. Hurd version. |
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| 2 | Copyright (C) 2016-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <pthread.h> |
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| 20 | #include <stdlib.h> |
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| 21 | #include <assert.h> |
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| 22 | #include <pt-internal.h> |
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| 23 | #include "pt-mutex.h" |
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| 24 | #include <hurdlock.h> |
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| 25 | |
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| 26 | int |
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| 27 | pthread_mutex_consistent (pthread_mutex_t *mtxp) |
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| 28 | { |
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| 29 | int ret = EINVAL; |
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| 30 | unsigned int val = mtxp->__lock; |
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| 31 | |
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| 32 | if ((mtxp->__flags & PTHREAD_MUTEX_ROBUST) != 0 |
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| 33 | && (val & LLL_DEAD_OWNER) != 0 |
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| 34 | && atomic_compare_and_exchange_bool_acq (&mtxp->__lock, |
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| 35 | __getpid () | LLL_WAITERS, |
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| 36 | val) == 0) |
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| 37 | { |
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| 38 | /* The mutex is now ours, and it's consistent. */ |
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| 39 | mtxp->__owner_id = _pthread_self ()->thread; |
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| 40 | mtxp->__cnt = 1; |
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| 41 | ret = 0; |
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| 42 | } |
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| 43 | |
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| 44 | return ret; |
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| 45 | } |
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| 46 | |
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| 47 | weak_alias (pthread_mutex_consistent, pthread_mutex_consistent_np) |
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| 48 | |
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