93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
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/* pthread_mutex_unlock. Hurd version.
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Copyright (C) 2016-2022 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_unlock (pthread_mutex_t *mtxp)
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{
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struct __pthread *self;
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int ret = 0, flags = mtxp->__flags & GSYNC_SHARED;
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switch (MTX_TYPE (mtxp))
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{
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case PT_MTX_NORMAL:
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lll_unlock (mtxp->__lock, flags);
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break;
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case PT_MTX_RECURSIVE:
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self = _pthread_self ();
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if (!mtx_owned_p (mtxp, self, flags))
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ret = EPERM;
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else if (--mtxp->__cnt == 0)
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{
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mtxp->__owner_id = mtxp->__shpid = 0;
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lll_unlock (mtxp->__lock, flags);
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}
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break;
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case PT_MTX_ERRORCHECK:
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self = _pthread_self ();
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if (!mtx_owned_p (mtxp, self, flags))
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ret = EPERM;
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else
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{
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mtxp->__owner_id = mtxp->__shpid = 0;
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lll_unlock (mtxp->__lock, flags);
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}
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break;
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case PT_MTX_NORMAL | PTHREAD_MUTEX_ROBUST:
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case PT_MTX_RECURSIVE | PTHREAD_MUTEX_ROBUST:
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case PT_MTX_ERRORCHECK | PTHREAD_MUTEX_ROBUST:
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self = _pthread_self ();
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if (mtxp->__owner_id == NOTRECOVERABLE_ID)
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; /* Nothing to do. */
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else if (mtxp->__owner_id != self->thread
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|| (int) (mtxp->__lock & LLL_OWNER_MASK) != __getpid ())
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ret = EPERM;
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else if (--mtxp->__cnt == 0)
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{
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/* Release the lock. If it's in an inconsistent
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* state, mark it as irrecoverable. */
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mtxp->__owner_id = ((mtxp->__lock & LLL_DEAD_OWNER)
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? NOTRECOVERABLE_ID : 0);
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lll_robust_unlock (mtxp->__lock, flags);
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}
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break;
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default:
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ret = EINVAL;
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break;
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}
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return ret;
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}
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hidden_def (__pthread_mutex_unlock)
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strong_alias (__pthread_mutex_unlock, _pthread_mutex_unlock)
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weak_alias (__pthread_mutex_unlock, pthread_mutex_unlock)
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