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/* pthread_mutex_unlock. Hurd version.
Copyright (C) 2016-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <pthread.h>
#include <stdlib.h>
#include <assert.h>
#include <pt-internal.h>
#include "pt-mutex.h"
#include <hurdlock.h>
int
__pthread_mutex_unlock (pthread_mutex_t *mtxp)
{
struct __pthread *self;
int ret = 0, flags = mtxp->__flags & GSYNC_SHARED;
switch (MTX_TYPE (mtxp))
{
case PT_MTX_NORMAL:
lll_unlock (&mtxp->__lock, flags);
break;
case PT_MTX_RECURSIVE:
self = _pthread_self ();
if (!mtx_owned_p (mtxp, self, flags))
ret = EPERM;
else if (--mtxp->__cnt == 0)
{
mtxp->__owner_id = mtxp->__shpid = 0;
lll_unlock (&mtxp->__lock, flags);
}
break;
case PT_MTX_ERRORCHECK:
self = _pthread_self ();
if (!mtx_owned_p (mtxp, self, flags))
ret = EPERM;
else
{
mtxp->__owner_id = mtxp->__shpid = 0;
lll_unlock (&mtxp->__lock, flags);
}
break;
case PT_MTX_NORMAL | PTHREAD_MUTEX_ROBUST:
case PT_MTX_RECURSIVE | PTHREAD_MUTEX_ROBUST:
case PT_MTX_ERRORCHECK | PTHREAD_MUTEX_ROBUST:
self = _pthread_self ();
if (mtxp->__owner_id == NOTRECOVERABLE_ID)
; /* Nothing to do. */
else if (mtxp->__owner_id != self->thread
|| (int) (mtxp->__lock & LLL_OWNER_MASK) != __getpid ())
ret = EPERM;
else if (--mtxp->__cnt == 0)
{
/* Release the lock. If it's in an inconsistent
* state, mark it as irrecoverable. */
mtxp->__owner_id = ((mtxp->__lock & LLL_DEAD_OWNER)
? NOTRECOVERABLE_ID : 0);
__lll_robust_unlock (&mtxp->__lock, flags);
}
break;
default:
ret = EINVAL;
break;
}
return ret;
}
strong_alias (__pthread_mutex_unlock, _pthread_mutex_unlock)
strong_alias (__pthread_mutex_unlock, pthread_mutex_unlock)
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