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/* $Id: win_get_processor_group_active_mask.c 3356 2020-06-05 02:09:14Z bird $ */
/** @file
* win_get_processor_group_active_mask - Helper.
*/
/*
* Copyright (c) 2020 knut st. osmundsen <bird-kBuild-spamxx@anduin.net>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Alternatively, the content of this file may be used under the terms of the
* GPL version 2 or later, or LGPL version 2.1 or later.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <string.h>
#include <Windows.h>
#include "win_get_processor_group_active_mask.h"
KAFFINITY win_get_processor_group_active_mask(unsigned iGroup)
{
union
{
SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX Info;
SYSTEM_INFO SysInfo;
char ab[8192];
} uBuf;
typedef BOOL (WINAPI *PFNGETLOGICALPROCESSORINFORMATIONEX)(LOGICAL_PROCESSOR_RELATIONSHIP,
SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX *, DWORD *);
static PFNGETLOGICALPROCESSORINFORMATIONEX volatile s_pfnGetLogicalProcessorInformationEx = NULL;
static HMODULE volatile s_hmodKernel32 = NULL;
PFNGETLOGICALPROCESSORINFORMATIONEX pfnGetLogicalProcessorInformationEx = s_pfnGetLogicalProcessorInformationEx;
if (!pfnGetLogicalProcessorInformationEx)
{
if (!s_hmodKernel32)
{
HMODULE hmodKernel32 = GetModuleHandleW(L"KERNEL32.DLL");
s_hmodKernel32 = hmodKernel32;
s_pfnGetLogicalProcessorInformationEx
= pfnGetLogicalProcessorInformationEx
= (PFNGETLOGICALPROCESSORINFORMATIONEX)GetProcAddress(hmodKernel32, "GetLogicalProcessorInformationEx");
}
}
SetLastError(0);
if (pfnGetLogicalProcessorInformationEx)
{
DWORD cbBuf;
memset(&uBuf, 0, sizeof(uBuf));
uBuf.Info.Size = cbBuf = sizeof(uBuf);
if (pfnGetLogicalProcessorInformationEx(RelationGroup, &uBuf.Info, &cbBuf))
{
SetLastError(0);
if (iGroup < uBuf.Info.Group.MaximumGroupCount)
return uBuf.Info.Group.GroupInfo[iGroup].ActiveProcessorMask;
}
}
else if (iGroup == 0)
{
GetSystemInfo(&uBuf.SysInfo);
return uBuf.SysInfo.dwActiveProcessorMask;
}
return 0;
}
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