59 lines
1.5 KiB
C++
59 lines
1.5 KiB
C++
/*******************************************************************************
|
|
|
|
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
|
|
|
|
This file is part of Sortix.
|
|
|
|
Sortix is free software: you can redistribute it and/or modify it under the
|
|
terms of the GNU General Public License as published by the Free Software
|
|
Foundation, either version 3 of the License, or (at your option) any later
|
|
version.
|
|
|
|
Sortix 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 General Public License for more
|
|
details.
|
|
|
|
You should have received a copy of the GNU General Public License along with
|
|
Sortix. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
device.cpp
|
|
A base class for all devices.
|
|
|
|
*******************************************************************************/
|
|
|
|
#include <sortix/kernel/platform.h>
|
|
#include <sortix/kernel/kthread.h>
|
|
#include <string.h>
|
|
#include "device.h"
|
|
|
|
namespace Sortix
|
|
{
|
|
Device::Device()
|
|
{
|
|
refcountlock = KTHREAD_MUTEX_INITIALIZER;
|
|
refcount = 0;
|
|
}
|
|
|
|
Device::~Device()
|
|
{
|
|
|
|
}
|
|
|
|
void Device::Unref()
|
|
{
|
|
bool shoulddelete = false;
|
|
kthread_mutex_lock(&refcountlock);
|
|
shoulddelete = --refcount == 0 || refcount == SIZE_MAX;
|
|
kthread_mutex_unlock(&refcountlock);
|
|
if ( shoulddelete )
|
|
delete this;
|
|
}
|
|
|
|
void Device::Refer()
|
|
{
|
|
ScopedLock lock(&refcountlock);
|
|
refcount++;
|
|
}
|
|
}
|