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/** @file
* IPRT - Spinlocks.
*/
/*
* Copyright (C) 2006-2007 Sun Microsystems, Inc.
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* 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.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 USA or visit http://www.sun.com if you need
* additional information or have any questions.
*/
#ifndef ___iprt_spinlock_h
#define ___iprt_spinlock_h
#include <iprt/cdefs.h>
#include <iprt/types.h>
RT_C_DECLS_BEGIN
/** @defgroup grp_rt_spinlock RTSpinlock - Spinlocks
* @ingroup grp_rt
* @{
*/
/**
* Temporary spinlock state variable.
* All members are undefined and highly platform specific.
*/
typedef struct RTSPINLOCKTMP
{
#ifdef IN_RING0
# ifdef RT_OS_LINUX
/** The saved [R|E]FLAGS. */
unsigned long flFlags;
# define RTSPINLOCKTMP_INITIALIZER { 0 }
# elif defined(RT_OS_WINDOWS)
/** The saved [R|E]FLAGS. */
RTCCUINTREG uFlags;
/** The KIRQL. */
unsigned char uchIrqL;
# define RTSPINLOCKTMP_INITIALIZER { 0, 0 }
# elif defined(__L4__)
/** The saved [R|E]FLAGS. */
unsigned long flFlags;
# define RTSPINLOCKTMP_INITIALIZER { 0 }
# elif defined(RT_OS_DARWIN) || defined(RT_OS_FREEBSD) || defined(RT_OS_SOLARIS)
/** The saved [R|E]FLAGS. */
RTCCUINTREG uFlags;
# define RTSPINLOCKTMP_INITIALIZER { 0 }
# elif defined(RT_OS_OS2)
/** The saved [R|E]FLAGS. (dummy) */
RTCCUINTREG uFlags;
# define RTSPINLOCKTMP_INITIALIZER { 0 }
# else
# error "PORTME\n"
/** The saved [R|E]FLAGS. */
RTCCUINTREG uFlags;
# endif
#else /* !IN_RING0 */
/** The saved [R|E]FLAGS. (dummy) */
RTCCUINTREG uFlags;
# define RTSPINLOCKTMP_INITIALIZER { 0 }
#endif /* !IN_RING0 */
} RTSPINLOCKTMP;
/** Pointer to a temporary spinlock state variable. */
typedef RTSPINLOCKTMP *PRTSPINLOCKTMP;
/** Pointer to a const temporary spinlock state variable. */
typedef const RTSPINLOCKTMP *PCRTSPINLOCKTMP;
/** @def RTSPINLOCKTMP_INITIALIZER
* What to assign to a RTSPINLOCKTMP at definition.
*/
#ifdef DOXYGEN_RUNNING
# define RTSPINLOCKTMP_INITIALIZER
#endif
/**
* Creates a spinlock.
*
* @returns iprt status code.
* @param pSpinlock Where to store the spinlock handle.
*/
RTDECL(int) RTSpinlockCreate(PRTSPINLOCK pSpinlock);
/**
* Destroys a spinlock created by RTSpinlockCreate().
*
* @returns iprt status code.
* @param Spinlock Spinlock returned by RTSpinlockCreate().
*/
RTDECL(int) RTSpinlockDestroy(RTSPINLOCK Spinlock);
/**
* Acquires the spinlock.
* Interrupts are disabled upon return.
*
* @param Spinlock The spinlock to acquire.
* @param pTmp Where to save the state.
*/
RTDECL(void) RTSpinlockAcquireNoInts(RTSPINLOCK Spinlock, PRTSPINLOCKTMP pTmp);
/**
* Releases the spinlock.
*
* @param Spinlock The spinlock to acquire.
* @param pTmp The state to restore. (This better be the same as for the RTSpinlockAcquire() call!)
*/
RTDECL(void) RTSpinlockReleaseNoInts(RTSPINLOCK Spinlock, PRTSPINLOCKTMP pTmp);
/**
* Acquires the spinlock.
*
* @param Spinlock The spinlock to acquire.
* @param pTmp Where to save the state.
*/
RTDECL(void) RTSpinlockAcquire(RTSPINLOCK Spinlock, PRTSPINLOCKTMP pTmp);
/**
* Releases the spinlock.
*
* @param Spinlock The spinlock to acquire.
* @param pTmp The state to restore. (This better be the same as for the RTSpinlockAcquire() call!)
*/
RTDECL(void) RTSpinlockRelease(RTSPINLOCK Spinlock, PRTSPINLOCKTMP pTmp);
/** @} */
RT_C_DECLS_END
#endif
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