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48 lines
1.5 KiB
C
48 lines
1.5 KiB
C
/* pthread_mutex_consistent. Hurd version.
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Copyright (C) 2016-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <pthread.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <pt-internal.h>
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#include "pt-mutex.h"
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#include <hurdlock.h>
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int
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pthread_mutex_consistent (pthread_mutex_t *mtxp)
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{
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int ret = EINVAL;
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unsigned int val = mtxp->__lock;
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if ((mtxp->__flags & PTHREAD_MUTEX_ROBUST) != 0
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&& (val & LLL_DEAD_OWNER) != 0
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&& atomic_compare_and_exchange_bool_acq (&mtxp->__lock,
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__getpid () | LLL_WAITERS,
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val) == 0)
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{
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/* The mutex is now ours, and it's consistent. */
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mtxp->__owner_id = _pthread_self ()->thread;
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mtxp->__cnt = 1;
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ret = 0;
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}
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return ret;
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}
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weak_alias (pthread_mutex_consistent, pthread_mutex_consistent_np)
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