/* ipc.c - This file is a part of NutsOS
 *
 * NutsOS
 * Copyright (C) 2013  Free Software Foundation, Inc.
 *
 * NutsOS 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.
 *
 * NutsOS 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 NutsOS; If not, see <http://www.gnu.org/licenses/>.
 *
 * Valentin Verdier <valentin.verdier03@gmail.com>
 */

#include "ipc.h"

#include "types.h"
#include "asm_x86.h"
#include "process.h"

void IPC_MutexLock(unsigned int* mutex)
{
	if(CurrentProcess)
	{
		if(_AtomicTestAndSet(mutex))
		{
			CurrentProcess->ipcWaitMutex = mutex;
			CurrentProcess->status = 1;
			Schedule();
		}
		else
		{
			CurrentProcess->ipcInSection++;
		}
	}
}

void IPC_MutexUnlock(unsigned int* mutex)
{
	if(CurrentProcess)
	{
		if(CurrentProcess->ipcInSection > 0)
		{
			*mutex = 0;
			CurrentProcess->ipcInSection--;
		}
	}
}