為什么 SetThreadAffinityMask 會被忽略？

Question

為什么 SetThreadAffinityMask 會被忽略？ 我正在嘗試編寫一個程序，根據 IdealProcessor 的值設置每個進程線程的親和力。 但是 SetThreadAffinityMask 被忽略了。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.InteropServices;
using System.Diagnostics;

namespace ThreadAffinity
{
    class Program
    {
        [DllImport("kernel32.dll")]
        static extern IntPtr OpenThread(ThreadAccess dwDesiredAccess, bool bInheritHandle, uint dwThreadId);

        [DllImport("kernel32.dll")]
        static extern bool SetThreadAffinityMask(IntPtr hThread, IntPtr dwThreadAffinityMask);

        [DllImport("kernel32.dll")]
        static extern bool GetThreadIdealProcessorEx(IntPtr hThread, ref PROCESSOR_NUMBER lpIdealProcessor);

        [DllImport("kernel32.dll")]
        static extern bool CloseHandle(IntPtr hObject);

        [StructLayout(LayoutKind.Sequential)]
        public struct PROCESSOR_NUMBER
        {
            public ushort Group;
            public byte Number;
            public byte Reserved;
        }

        [Flags]
        public enum ThreadAccess : int
        {
            TERMINATE = (0x0001),
            SUSPEND_RESUME = (0x0002),
            GET_CONTEXT = (0x0008),
            SET_CONTEXT = (0x0010),
            SET_INFORMATION = (0x0020),
            QUERY_INFORMATION = (0x0040),
            SET_THREAD_TOKEN = (0x0080),
            IMPERSONATE = (0x0100),
            DIRECT_IMPERSONATION = (0x0200),
            THREAD_ALL_ACCESS = (0x1F03FF)
        }

        static void Main(string[] args)
        {
            Console.WriteLine("Enter process id:");
            int processId = Convert.ToInt32(Console.ReadLine());
            Process process = Process.GetProcessById(processId);
            foreach (ProcessThread thread in process.Threads)
            {
                IntPtr hThread = OpenThread(ThreadAccess.QUERY_INFORMATION, false, (uint)thread.Id);
                PROCESSOR_NUMBER processorNumber = new PROCESSOR_NUMBER();
                GetThreadIdealProcessorEx(hThread, ref processorNumber);
                Console.WriteLine("Thread {0} ideal processor is {1}", thread.Id, processorNumber.Number);
                SetThreadAffinityMask(hThread, (IntPtr)(1 << processorNumber.Number));
                CloseHandle(hThread);
            }
            Console.WriteLine("Press any key to exit...");
            Console.ReadKey();
        }
    }
}

我不能否認 99% 的可能性我是個白痴，這就是為什么我來這里尋求你的幫助。

upd1：程序正確檢測到idealprocessor，但沒有設置線程的親和力。

Answer 1

正如@RaymondChen所說

根據文檔：此句柄必須具有 THREAD_SET_INFORMATION 或 THREAD_SET_LIMITED_INFORMATION 訪問權限以及 THREAD_QUERY_INFORMATION 或 THREAD_QUERY_LIMITED_INFORMATION 訪問權限。