Windows下获取逻辑cpu数量和cpu核数量（用GetLogicalProcessorInformation，从XP3才开始有的API）

时间：2016-12-08 02:30:43 阅读：364 评论：0 收藏：0 [点我收藏+]

代码可在Windows NT下正常运行

具体API说明请参照如下文档：

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typedef BOOL (WINAPI *LPFN_GLPI)(PSYSTEM_LOGICAL_PROCESSOR_INFORMATION, PDWORD);
DWORD CountSetBits(ULONG_PTR bitMask)
{
DWORD LSHIFT = sizeof(ULONG_PTR)*8 - 1;
DWORD bitSetCount = 0;
ULONG_PTR bitTest = (ULONG_PTR)1 << LSHIFT;
DWORD i;
for (i = 0; i <= LSHIFT; ++i)
{
bitSetCount += ((bitMask & bitTest)?1:0);
bitTest/=2;
}
return bitSetCount;
}
LPFN_GLPI glpi;
glpi = (LPFN_GLPI) GetProcAddress(GetModuleHandle(TEXT("kernel32")),"GetLogicalProcessorInformation");
if (NULL == glpi)
{
printf("GetLogicalProcessorInformation is not supported.\n");
}
BOOL done = FALSE;
PSYSTEM_LOGICAL_PROCESSOR_INFORMATION buffer = NULL;
PSYSTEM_LOGICAL_PROCESSOR_INFORMATION ptr = NULL;
DWORD returnLength = 0;
while (!done)
{
DWORD rc = glpi(buffer, &returnLength);
if (FALSE == rc)
{
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
{
if (buffer)
free(buffer);
buffer = (PSYSTEM_LOGICAL_PROCESSOR_INFORMATION)malloc(returnLength);
if (NULL == buffer)
{
printf("Error: Allocation failure\n");
return (2);
}
}
else
{
printf("Error %d\n", GetLastError());
return (3);
}
}
else
{
done = TRUE;
}
}
ptr = buffer;
DWORD byteOffset = 0;
DWORD logicalProcessorCount = 0;
DWORD processorCoreCount = 0;
while (byteOffset + sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION) <= returnLength)
{
switch (ptr->Relationship)
{
case RelationProcessorCore:
processorCoreCount++;
logicalProcessorCount += CountSetBits(ptr->ProcessorMask);
break;
}
byteOffset += sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION);
ptr++;
}
printf("logical:%d core:%d\n", logicalProcessorCount, processorCoreCount);

http://blog.csdn.net/tobacco5648/article/details/22201169

原文地址：http://www.cnblogs.com/findumars/p/6143334.html

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