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Thread secured the kernel device class.

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This commit is contained in:
Jonas 'Sortie' Termansen 2012-08-01 17:38:22 +02:00
parent 38349da082
commit f00c8b3d63
2 changed files with 22 additions and 11 deletions
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20
sortix/device.cpp
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@ -1,6 +1,6 @@
/****************************************************************************** /*******************************************************************************
COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011. Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
This file is part of Sortix. This file is part of Sortix.
@ -14,15 +14,16 @@
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
details. details.
You should have received a copy of the GNU General Public License along You should have received a copy of the GNU General Public License along with
with Sortix. If not, see <http://www.gnu.org/licenses/>. Sortix. If not, see <http://www.gnu.org/licenses/>.
device.cpp device.cpp
A base class for all devices. A base class for all devices.
******************************************************************************/ *******************************************************************************/
#include <sortix/kernel/platform.h> #include <sortix/kernel/platform.h>
#include <sortix/kernel/kthread.h>
#include <libmaxsi/memory.h> #include <libmaxsi/memory.h>
#include "device.h" #include "device.h"
@ -30,6 +31,7 @@ namespace Sortix
{ {
Device::Device() Device::Device()
{ {
refcountlock = KTHREAD_MUTEX_INITIALIZER;
refcount = 0; refcount = 0;
} }
@ -40,11 +42,17 @@ namespace Sortix
void Device::Unref() void Device::Unref()
{ {
if ( --refcount == 0 || refcount == SIZE_MAX ) { delete this; } bool shoulddelete = false;
kthread_mutex_lock(&refcountlock);
shoulddelete = --refcount == 0 || refcount == SIZE_MAX;
kthread_mutex_unlock(&refcountlock);
if ( shoulddelete )
delete this;
} }
void Device::Refer() void Device::Refer()
{ {
ScopedLock lock(&refcountlock);
refcount++; refcount++;
} }
} }

13
sortix/device.h
View file

@ -1,6 +1,6 @@
/****************************************************************************** /*******************************************************************************
COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011. Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
This file is part of Sortix. This file is part of Sortix.
@ -14,17 +14,19 @@
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
details. details.
You should have received a copy of the GNU General Public License along You should have received a copy of the GNU General Public License along with
with Sortix. If not, see <http://www.gnu.org/licenses/>. Sortix. If not, see <http://www.gnu.org/licenses/>.
device.h device.h
A base class for all devices. A base class for all devices.
******************************************************************************/ *******************************************************************************/
#ifndef SORTIX_DEVICE_H #ifndef SORTIX_DEVICE_H
#define SORTIX_DEVICE_H #define SORTIX_DEVICE_H
#include <sortix/kernel/kthread.h>
namespace Sortix namespace Sortix
{ {
class Device class Device
@ -42,6 +44,7 @@ namespace Sortix
virtual ~Device(); virtual ~Device();
private: private:
kthread_mutex_t refcountlock;
size_t refcount; size_t refcount;
public: public: