public static bool CpuIdTx(uint index, uint ecxValue, out uint eax, out uint ebx, out uint ecx, out uint edx, GroupAffinity affinity)
{
GroupAffinity previousAffinity = ThreadAffinity.Set(affinity);
if (previousAffinity == GroupAffinity.Undefined)
{
eax = ebx = ecx = edx = 0;
return(false);
}
CpuId(index, ecxValue, out eax, out ebx, out ecx, out edx);
ThreadAffinity.Set(previousAffinity);
return(true);
}
/// <summary>
/// Sets the processor group affinity for the current thread.
/// </summary>
/// <param name="affinity">The processor group affinity.</param>
/// <returns>The previous processor group affinity.</returns>
public static GroupAffinity Set(GroupAffinity affinity)
{
if (affinity == GroupAffinity.Undefined)
{
return(GroupAffinity.Undefined);
}
if (Software.OperatingSystem.IsUnix)
{
if (affinity.Group > 0)
{
throw new ArgumentOutOfRangeException(nameof(affinity));
}
ulong result = 0;
if (LibC.sched_getaffinity(0, (IntPtr)8, ref result) != 0)
{
return(GroupAffinity.Undefined);
}
ulong mask = affinity.Mask;
if (LibC.sched_setaffinity(0, (IntPtr)8, ref mask) != 0)
{
return(GroupAffinity.Undefined);
}
return(new GroupAffinity(0, result));
}
UIntPtr uIntPtrMask;
try
{
uIntPtrMask = (UIntPtr)affinity.Mask;
}
catch (OverflowException)
{
throw new ArgumentOutOfRangeException(nameof(affinity));
}
var groupAffinity = new Kernel32.GROUP_AFFINITY {
Group = affinity.Group, Mask = uIntPtrMask
};
IntPtr currentThread = Kernel32.GetCurrentThread();
try
{
if (Kernel32.SetThreadGroupAffinity(currentThread,
ref groupAffinity,
out Kernel32.GROUP_AFFINITY previousGroupAffinity))
{
return(new GroupAffinity(previousGroupAffinity.Group, (ulong)previousGroupAffinity.Mask));
}
return(GroupAffinity.Undefined);
}
catch (EntryPointNotFoundException)
{
if (affinity.Group > 0)
{
throw new ArgumentOutOfRangeException(nameof(affinity));
}
ulong previous = (ulong)Kernel32.SetThreadAffinityMask(currentThread, uIntPtrMask);
return(new GroupAffinity(0, previous));
}
}