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/* $Id: mp-win.cpp $ */
/** @file
* IPRT - Multiprocessor, Windows.
*/
/*
* Copyright (C) 2006-2011 Oracle Corporation
*
* 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.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#define LOG_GROUP RTLOGGROUP_SYSTEM
#include <Windows.h>
#include <iprt/mp.h>
#include "internal/iprt.h"
#include <iprt/assert.h>
#include <iprt/cpuset.h>
#include <iprt/ldr.h>
#include <iprt/mem.h>
AssertCompile(MAXIMUM_PROCESSORS <= RTCPUSET_MAX_CPUS);
/** @todo RTmpCpuId(). */
RTDECL(int) RTMpCpuIdToSetIndex(RTCPUID idCpu)
{
return idCpu < MAXIMUM_PROCESSORS ? idCpu : -1;
}
RTDECL(RTCPUID) RTMpCpuIdFromSetIndex(int iCpu)
{
return (unsigned)iCpu < MAXIMUM_PROCESSORS ? iCpu : NIL_RTCPUID;
}
RTDECL(RTCPUID) RTMpGetMaxCpuId(void)
{
return MAXIMUM_PROCESSORS - 1;
}
RTDECL(bool) RTMpIsCpuOnline(RTCPUID idCpu)
{
RTCPUSET Set;
return RTCpuSetIsMember(RTMpGetOnlineSet(&Set), idCpu);
}
RTDECL(bool) RTMpIsCpuPossible(RTCPUID idCpu)
{
RTCPUSET Set;
return RTCpuSetIsMember(RTMpGetSet(&Set), idCpu);
}
RTDECL(PRTCPUSET) RTMpGetSet(PRTCPUSET pSet)
{
RTCPUID idCpu = RTMpGetCount();
RTCpuSetEmpty(pSet);
while (idCpu-- > 0)
RTCpuSetAdd(pSet, idCpu);
return pSet;
}
RTDECL(RTCPUID) RTMpGetCount(void)
{
SYSTEM_INFO SysInfo;
GetSystemInfo(&SysInfo);
Assert((RTCPUID)SysInfo.dwNumberOfProcessors == SysInfo.dwNumberOfProcessors);
return SysInfo.dwNumberOfProcessors;
}
RTDECL(RTCPUID) RTMpGetCoreCount(void)
{
/*
* Resolve the API dynamically (one try) as it requires XP w/ sp3 or later.
*/
typedef BOOL (WINAPI *PFNGETLOGICALPROCINFO)(PSYSTEM_LOGICAL_PROCESSOR_INFORMATION, PDWORD);
static PFNGETLOGICALPROCINFO s_pfnGetLogicalProcInfo = (PFNGETLOGICALPROCINFO)~(uintptr_t)0;
if (s_pfnGetLogicalProcInfo == (PFNGETLOGICALPROCINFO)~(uintptr_t)0)
s_pfnGetLogicalProcInfo = (PFNGETLOGICALPROCINFO)RTLdrGetSystemSymbol("kernel32.dll", "GetLogicalProcessorInformation");
if (s_pfnGetLogicalProcInfo)
{
/*
* Query the information. This unfortunately requires a buffer, so we
* start with a guess and let windows advice us if it's too small.
*/
DWORD cbSysProcInfo = _4K;
PSYSTEM_LOGICAL_PROCESSOR_INFORMATION paSysInfo = NULL;
BOOL fRc = FALSE;
do
{
cbSysProcInfo = RT_ALIGN_32(cbSysProcInfo, 256);
void *pv = RTMemRealloc(paSysInfo, cbSysProcInfo);
if (!pv)
break;
paSysInfo = (PSYSTEM_LOGICAL_PROCESSOR_INFORMATION)pv;
fRc = s_pfnGetLogicalProcInfo(paSysInfo, &cbSysProcInfo);
} while (!fRc && GetLastError() == ERROR_INSUFFICIENT_BUFFER);
if (fRc)
{
/*
* Parse the result.
*/
uint32_t cCores = 0;
uint32_t i = cbSysProcInfo / sizeof(paSysInfo[0]);
while (i-- > 0)
if (paSysInfo[i].Relationship == RelationProcessorCore)
cCores++;
RTMemFree(paSysInfo);
Assert(cCores > 0);
return cCores;
}
RTMemFree(paSysInfo);
}
/* If we don't have the necessary API or if it failed, return the same
value as the generic implementation. */
return RTMpGetCount();
}
RTDECL(PRTCPUSET) RTMpGetOnlineSet(PRTCPUSET pSet)
{
SYSTEM_INFO SysInfo;
GetSystemInfo(&SysInfo);
/** @todo port to W2K8 / W7 w/ > 64 CPUs & grouping. */
return RTCpuSetFromU64(pSet, SysInfo.dwActiveProcessorMask);
}
RTDECL(RTCPUID) RTMpGetOnlineCount(void)
{
RTCPUSET Set;
RTMpGetOnlineSet(&Set);
return RTCpuSetCount(&Set);
}
RTDECL(RTCPUID) RTMpGetOnlineCoreCount(void)
{
/** @todo this isn't entirely correct. */
return RTMpGetCoreCount();
}
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