PROCESSOR_RELATIONSHIP

using System;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct GROUP_AFFINITY
{
    public UIntPtr Mask;
    public ushort Group;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)] public ushort[] Reserved;
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct PROCESSOR_RELATIONSHIP
{
    public byte Flags;
    public byte EfficiencyClass;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 20)] public byte[] Reserved;
    public ushort GroupCount;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 1)] public GROUP_AFFINITY[] GroupMask;
}

Imports System.Runtime.InteropServices

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure GROUP_AFFINITY
    Public Mask As UIntPtr
    Public Group As UShort
    <MarshalAs(UnmanagedType.ByValArray, SizeConst:=3)> Public Reserved() As UShort
End Structure

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure PROCESSOR_RELATIONSHIP
    Public Flags As Byte
    Public EfficiencyClass As Byte
    <MarshalAs(UnmanagedType.ByValArray, SizeConst:=20)> Public Reserved() As Byte
    Public GroupCount As UShort
    <MarshalAs(UnmanagedType.ByValArray, SizeConst:=1)> Public GroupMask() As GROUP_AFFINITY
End Structure

import ctypes
from ctypes import wintypes

class GROUP_AFFINITY(ctypes.Structure):
    _fields_ = [
        ("Mask", ctypes.c_size_t),
        ("Group", ctypes.c_ushort),
        ("Reserved", ctypes.c_ushort * 3),
    ]

class PROCESSOR_RELATIONSHIP(ctypes.Structure):
    _fields_ = [
        ("Flags", ctypes.c_ubyte),
        ("EfficiencyClass", ctypes.c_ubyte),
        ("Reserved", ctypes.c_ubyte * 20),
        ("GroupCount", ctypes.c_ushort),
        ("GroupMask", GROUP_AFFINITY * 1),
    ]

#[repr(C)]
pub struct GROUP_AFFINITY {
    pub Mask: usize,
    pub Group: u16,
    pub Reserved: [u16; 3],
}

#[repr(C)]
pub struct PROCESSOR_RELATIONSHIP {
    pub Flags: u8,
    pub EfficiencyClass: u8,
    pub Reserved: [u8; 20],
    pub GroupCount: u16,
    pub GroupMask: [GROUP_AFFINITY; 1],
}

import "golang.org/x/sys/windows"

type GROUP_AFFINITY struct {
	Mask uintptr
	Group uint16
	Reserved [3]uint16
}

type PROCESSOR_RELATIONSHIP struct {
	Flags byte
	EfficiencyClass byte
	Reserved [20]byte
	GroupCount uint16
	GroupMask [1]GROUP_AFFINITY
}

type
  GROUP_AFFINITY = record
    Mask: NativeUInt;
    Group: Word;
    Reserved: array[0..2] of Word;
  end;

  PROCESSOR_RELATIONSHIP = record
    Flags: Byte;
    EfficiencyClass: Byte;
    Reserved: array[0..19] of Byte;
    GroupCount: Word;
    GroupMask: array[0..0] of GROUP_AFFINITY;
  end;

const GROUP_AFFINITY = extern struct {
    Mask: usize,
    Group: u16,
    Reserved: [3]u16,
};

const PROCESSOR_RELATIONSHIP = extern struct {
    Flags: u8,
    EfficiencyClass: u8,
    Reserved: [20]u8,
    GroupCount: u16,
    GroupMask: [1]GROUP_AFFINITY,
};

type
  GROUP_AFFINITY {.bycopy.} = object
    Mask: uint
    Group: uint16
    Reserved: array[3, uint16]

  PROCESSOR_RELATIONSHIP {.bycopy.} = object
    Flags: uint8
    EfficiencyClass: uint8
    Reserved: array[20, uint8]
    GroupCount: uint16
    GroupMask: array[1, GROUP_AFFINITY]

struct GROUP_AFFINITY
{
    size_t Mask;
    ushort Group;
    ushort[3] Reserved;
}

struct PROCESSOR_RELATIONSHIP
{
    ubyte Flags;
    ubyte EfficiencyClass;
    ubyte[20] Reserved;
    ushort GroupCount;
    GROUP_AFFINITY[1] GroupMask;
}