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/* pthread_mutex_trylock. Hurd version.
Copyright (C) 2016-2021 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_trylock (pthread_mutex_t *mtxp)
{
struct __pthread *self;
int ret;
switch (MTX_TYPE (mtxp))
{
case PT_MTX_NORMAL:
ret = lll_trylock (mtxp->__lock);
if (ret)
ret = EBUSY;
break;
case PT_MTX_RECURSIVE:
self = _pthread_self ();
if (mtx_owned_p (mtxp, self, mtxp->__flags))
{
if (__glibc_unlikely (mtxp->__cnt + 1 == 0))
return EAGAIN;
++mtxp->__cnt;
ret = 0;
}
else if ((ret = lll_trylock (mtxp->__lock)) == 0)
{
mtx_set_owner (mtxp, self, mtxp->__flags);
mtxp->__cnt = 1;
}
else
ret = EBUSY;
break;
case PT_MTX_ERRORCHECK:
self = _pthread_self ();
if ((ret = lll_trylock (mtxp->__lock)) == 0)
mtx_set_owner (mtxp, self, mtxp->__flags);
else
ret = EBUSY;
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 ();
ROBUST_LOCK (self, mtxp, lll_robust_trylock);
break;
default:
ret = EINVAL;
break;
}
return ret;
}
hidden_def (__pthread_mutex_trylock)
strong_alias (__pthread_mutex_trylock, _pthread_mutex_trylock)
weak_alias (__pthread_mutex_trylock, pthread_mutex_trylock)
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