我正在编写一个用于CPU使用率统计的程序。我有一个Processes的列表,每个列表都有其Process.Threads。对于每个线程,我想知道其当前的亲和力,以了解其绑定到哪个CPU内核,但是只能设置ProcessThread.ProcessAffinity……不可读!
为什么?有没有办法获取这些信息?
而且,我可以不调用低级Win32函数而只需调用.NET Standard来获取它吗?
答案 0 :(得分:1)
在@ oliver-rogier提示之后,我设法通过使用设置掩码(从C ++导入)的功能来做到这一点。如文档中所述:
返回值
如果函数成功,则返回值是线程的先前亲和力掩码。
[DllImport(@"kernel32.dll", SetLastError = true)]
static extern IntPtr SetThreadAffinityMask(IntPtr hThread, IntPtr dwThreadAffinityMask);
public static IntPtr GetThreadAffinityMask(uint threadId)
{
Thread.BeginThreadAffinity();
// get the handle
IntPtr hThread = OpenThread(ThreadAccess.SET_INFORMATION | ThreadAccess.QUERY_INFORMATION, false, threadId);
if (hThread == INVALID_HANDLE_VALUE)
{
var err = GetLastError();
return IntPtr.Zero;
}
// there is no "get" for affinity mask, but the "set" function returns the mask before the operation
// so first set a temp mask to obtain the current one
IntPtr old = SetThreadAffinityMask(hThread, new IntPtr((int)Math.Pow(2, Environment.ProcessorCount)) - 1);
if (old == IntPtr.Zero)
{
var err = GetLastError();
return old;
}
// then restore the original value
SetThreadAffinityMask(hThread, old);
CloseHandle(hThread);
Thread.EndThreadAffinity();
return old;
}