mp.h revision ab7139411cba3600213877c953b69fc11a7ef0cf
/** @file
* innotek Portable Runtime - Multiprocessor.
*/
/*
* Copyright (C) 2008 innotek GmbH
*
* 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.
*/
#ifndef ___iprt_mp_h
#define ___iprt_mp_h
#include <iprt/cdefs.h>
#include <iprt/types.h>
__BEGIN_DECLS
/** @defgroup grp_rt_mp RTMp - Multiprocessor
* @ingroup grp_rt
* @{
*/
/** Maximum number of CPUs we support in one system.
* @remarks The current limit in Windows (affinity mask)
*/
#define RT_MP_MAX_CPU 64
/**
* Gets the identifier of the CPU executing the call.
*
* When called from a system mode where scheduling is active, like ring-3 or
* kernel mode with interrupts enabled on some systems, no assumptions should
* be made about the current CPU when the call returns.
*
* @returns CPU Id.
*/
RTDECL(RTCPUID) RTMpCpuId(void);
/**
* Checks if a CPU is online or not.
*
* @returns true/false accordingly.
* @param idCpu The identifier of the CPU.
*/
RTDECL(bool) RTMpIsCpuOnline(RTCPUID idCpu);
/**
* Checks if a CPU exist or not / validates a CPU id.
*
* @returns true/false accordingly.
* @param idCpu The identifier of the CPU.
*/
RTDECL(bool) RTMpDoesCpuExist(RTCPUID idCpu);
/**
* Converts a CPU identifier to a CPU set index.
*
* @returns The CPU set index on success, -1 on failure.
* @param idCpu The identifier of the CPU.
*/
RTDECL(int) RTMpCpuIdToSetIndex(RTCPUID idCpu);
/**
* Gets set of the CPUs present in the system.
*
* This set includes CPUs in any state, see RTGetOnlineSet()
* for an alternative.
*
* @returns pSet.
* @param pSet Where to put the set.
*/
RTDECL(PRTCPUSET) RTMpGetSet(PRTCPUSET pSet);
/**
* Get the count of CPUs presetn in the system.
*
* @return The count.
*/
RTDECL(RTCPUID) RTMpGetCount(void);
/**
* Gets set of the CPUs present that are currently online.
*
* @returns pSet.
* @param pSet Where to put the set.
*/
RTDECL(void) RTMpGetOnlineSet(PRTCPUSET pSet);
/**
* Get the count of CPUs that are currently online.
*
* @return The count.
*/
RTDECL(RTCPUID) RTMpGetOnlineCount(void);
#ifdef IN_RING0
/**
* Worker function passed to RTMpOnAll, RTMpOnOthers and RTMpOnSpecific that
* is to be called on the target cpus.
*
* @param idCpu The identifier for the CPU the function is called on.
* @param pvUser1 The 1st user argument.
* @param pvUser2 The 2nd user argument.
*/
typedef DECLCALLBACK(void) FNRTMPWORKER(RTCPUID idCpu, void *pvUser1, void *pvUser2);
/** Pointer to a FNRTMPWORKER. */
typedef FNRTMPWORKER *PFNRTMPWORKER;
/**
* Executes a function on each (online) CPU in the system.
*
* @returns IPRT status code.
* @retval VINF_SUCCESS on success.
* @retval VERR_NOT_SUPPORTED if this kind of operation isn't supported by the system.
*
* @param pfnWorker The worker function.
* @param pvUser1 The first user argument for the worker.
* @param pvUser2 The second user argument for the worker.
*
* @remarks The execution isn't in any way guaranteed to be simultaneous,
* it might even be serial (cpu by cpu).
*/
RTDECL(int) RTMpOnAll(PFNRTMPWORKER pfnWorker, void *pvUser1, void *pvUser2);
/**
* Executes a function on a all other (online) CPUs in the system.
*
* @returns IPRT status code.
* @retval VINF_SUCCESS on success.
* @retval VERR_NOT_SUPPORTED if this kind of operation isn't supported by the system.
*
* @param pfnWorker The worker function.
* @param pvUser1 The first user argument for the worker.
* @param pvUser2 The second user argument for the worker.
*
* @remarks The execution isn't in any way guaranteed to be simultaneous,
* it might even be serial (cpu by cpu).
*/
RTDECL(int) RTMpOnOthers(PFNRTMPWORKER pfnWorker, void *pvUser1, void *pvUser2);
/**
* Executes a function on a specific CPU in the system.
*
* @returns IPRT status code.
* @retval VINF_SUCCESS on success.
* @retval VERR_NOT_SUPPORTED if this kind of operation isn't supported by the system.
* @retval VERR_CPU_OFFLINE if the CPU is offline.
* @retval VERR_CPU_NOT_FOUND if the CPU wasn't found.
*
* @param idCpu The id of the CPU.
* @param pfnWorker The worker function.
* @param pvUser1 The first user argument for the worker.
* @param pvUser2 The second user argument for the worker.
*/
RTDECL(int) RTMpOnSpecific(RTCPUID idCpu, PFNRTMPWORKER pfnWorker, void *pvUser1, void *pvUser2);
#endif /* IN_RING0 */
/** @} */
__END_DECLS
#endif