spinlock-r0drv-nt.cpp revision acb85e6b36e32c7960c769bde511f0bade006c3d
/* $Id$ */
/** @file
* IPRT - Spinlocks, Ring-0 Driver, NT.
*/
/*
* Copyright (C) 2006-2012 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#include "the-nt-kernel.h"
#include <iprt/spinlock.h>
#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
# include <iprt/asm-amd64-x86.h>
#endif
/*******************************************************************************
* Defined Constants And Macros *
*******************************************************************************/
/** Apply the NoIrq hack if defined. */
#define RTSPINLOCK_NT_HACK_NOIRQ
#ifdef RTSPINLOCK_NT_HACK_NOIRQ
/** Indicates that the spinlock is taken. */
/** Indicates that the spinlock is taken. */
#endif
/*******************************************************************************
* Structures and Typedefs *
*******************************************************************************/
/**
* Wrapper for the KSPIN_LOCK type.
*/
typedef struct RTSPINLOCKINTERNAL
{
/** Spinlock magic value (RTSPINLOCK_MAGIC). */
#ifdef RTSPINLOCK_NT_HACK_NOIRQ
/** Spinlock hack. */
#endif
/** The saved IRQL. */
/** The saved interrupt flag. */
RTCCUINTREG volatile fIntSaved;
/** The spinlock creation flags. */
/** The NT spinlock structure. */
{
AssertReturn(fFlags == RTSPINLOCK_FLAGS_INTERRUPT_SAFE || fFlags == RTSPINLOCK_FLAGS_INTERRUPT_UNSAFE, VERR_INVALID_PARAMETER);
/*
* Allocate.
*/
Assert(sizeof(RTSPINLOCKINTERNAL) > sizeof(void *));
if (!pThis)
return VERR_NO_MEMORY;
/*
* Initialize & return.
*/
#ifdef RTSPINLOCK_NT_HACK_NOIRQ
#endif
return VINF_SUCCESS;
}
{
/*
* Validate input.
*/
if (!pThis)
return VERR_INVALID_PARAMETER;
{
return VERR_INVALID_PARAMETER;
}
return VINF_SUCCESS;
}
{
{
#ifndef RTSPINLOCK_NT_HACK_NOIRQ
#else
if (SavedIrql < DISPATCH_LEVEL)
{
}
if (!ASMAtomicCmpXchgU32(&pThis->u32Hack, RTSPINLOCK_NT_HACK_NOIRQ_TAKEN, RTSPINLOCK_NT_HACK_NOIRQ_FREE))
{
while (!ASMAtomicCmpXchgU32(&pThis->u32Hack, RTSPINLOCK_NT_HACK_NOIRQ_TAKEN, RTSPINLOCK_NT_HACK_NOIRQ_FREE))
ASMNopPause();
}
#endif
}
else
}
{
{
#ifndef RTSPINLOCK_NT_HACK_NOIRQ
#else
if (SavedIrql < DISPATCH_LEVEL)
#endif
}
else
}
{
#if 1
#else
#endif
}