internal CacheDescriptor(CacheLevel level, CacheAssociativity associativity, Int16 lineSize, Int32 size, ProcessorCacheType type)
{
m_level = level;
m_associativity = associativity;
m_lineSize = lineSize;
m_size = size;
m_type = type;
}
public static unsafe LogicalProcessorInformation[] GetLogicalProcessorInformation()
{
// Get the required buffer size
Int32 length = 0;
NativeMethods.GetLogicalProcessorInformation(null, ref length);
Contract.Assume(length > 0);
// Allocate the buffer & query the data
Byte[] bytes = new Byte[length];
fixed(Byte *pb = &bytes[0])
{
Boolean ok = NativeMethods.GetLogicalProcessorInformation(pb, ref length);
if (!ok)
{
throw new Win32Exception();
}
}
List <LogicalProcessorInformation> list = new List <LogicalProcessorInformation>();
for (Int32 elementIndex = 0; elementIndex < length; elementIndex += (2 * IntPtr.Size) + 16)
{
Int32 index = elementIndex;
Int64 processorMask;
if (IntPtr.Size == 4)
{
processorMask = (Int64)BitConverter.ToInt32(bytes, index);
}
else
{
processorMask = BitConverter.ToInt64(bytes, index);
}
index += IntPtr.Size;
LogicalProcessorRelationship lpr;
if (IntPtr.Size == 4)
{
lpr = (LogicalProcessorRelationship)BitConverter.ToInt32(bytes, index);
}
else
{
lpr = (LogicalProcessorRelationship)BitConverter.ToInt64(bytes, index);
}
index += IntPtr.Size;
LogicalProcessorInformation lpi = null;
switch (lpr)
{
case LogicalProcessorRelationship.Cache:
CacheLevel level = (CacheLevel)bytes[index++];
CacheAssociativity associativity = (CacheAssociativity)bytes[index++];
Int16 lineSize = BitConverter.ToInt16(bytes, index); index += 2;
Int32 size = BitConverter.ToInt32(bytes, index); index += 4;
ProcessorCacheType type = (ProcessorCacheType)BitConverter.ToInt32(bytes, index);
lpi = new LogicalProcessorInformation(processorMask, lpr, new CacheDescriptor(level, associativity, lineSize, size, type));
break;
case LogicalProcessorRelationship.NumaNode:
lpi = new LogicalProcessorInformation(processorMask, lpr, BitConverter.ToInt32(bytes, index));
break;
case LogicalProcessorRelationship.ProcessorCore:
lpi = new LogicalProcessorInformation(processorMask, lpr, bytes[index]);
break;
case LogicalProcessorRelationship.ProcessorPackage:
lpi = new LogicalProcessorInformation(processorMask, lpr);
break;
}
list.Add(lpi);
}
return(list.ToArray());
}
