如何使用Java Native Access为Java.exe以外的进程设置进程亲和力？ [英] How to use Java Native Access to set process affinity for processes besides Java.exe?

问题描述

尽管手动操作相当容易，但我尝试在Windows 7中自动为各种VM在初始创建时间后自动设置cpu亲和力。该项目使用Java，并且我试图避免直接包含C代码，因此我一直在使用Java Native Access，它掩盖了诸如winapi之类的东西。我是图书馆的新手，虽然有些基本的内容可以通过Google的快速搜索找到，但它在教程或示例中还是有点缺乏。

Although it is fairly easy to do manually, I am attempting to automate the setting of cpu affinity in Windows 7 for various VMs after their initial creation time. The project is in Java and I am trying to avoid directly including C code, so I have been using Java Native Access, which masks things like winapi. I'm new to the library, and it's a bit lacking in tutorials or examples, although there are some basic ones findable through quick Google searches.

使用以下代码，我可以设置主要Java进程（在本地为ffffffffffffffffff）的关联性，但是即使我具有使用任务管理器手动设置关联性的特权，其他进程也不会完全受影响。我还遍历了从0到10000的所有整数，而不仅仅是输入我知道是有效的id。

Using the following code, I can set the affinity of the main Java process (ffffffffffffffff locally), but other processes remain completely unaffected, even when I have the privileges to manually set affinity using Task Manager. I have also iterated over all integers from 0 to 10000, rather than just entering ids I know to be valid.

主类：

import com.sun.jna.Native;
import com.sun.jna.Pointer;
import com.sun.jna.platform.win32.WinNT.HANDLE;

public class SetAffinity {
  public static void main(String[] args){
    int pid = -1;
    AffinityKernel instance = (AffinityKernel)Native.loadLibrary("Kernel32",AffinityKernel.class));
    System.out.println(instance.SetProcessAffinityMask(new HANDLE(new Pointer(pid)), 1));
  }
}

实用程序界面：

import com.sun.jna.platform.win32.Kernel32;
import com.sun.jna.platform.win32.WinNT.HANDLE;

public interface AffinityKernel extends Kernel32{
  public boolean SetProcessAffinityMask(HANDLE hProcess, int dwProcessAffinityMask);
}

因为我可以检查它是否正确设置了正在运行的进程的cpu亲和力在其中，我知道语法是正确的。

Since I can check that it correctly sets the cpu affinity of the process it's running in, I know the syntax is correct.

问题是：

如何访问/引用流程除了当前过程以外？

How do I access/reference processes besides the current process?

推荐答案

您正在寻找的另一个例程是 OpenProcess ，它使您可以将句柄转到另一个进程，然后可以在 SetProcessAffinityMask 中使用它。调用签名：

The other routine you're looking for is OpenProcess, which allows you to get a HANDLE to another process, which you can then use in the SetProcessAffinityMask. The calling signature:

HANDLE OpenProcess(DWORD dwDesiredAccess, BOOL bInheritHandle, DWORD dwProcessId);

它已经暴露在Kernel32界面中。

It's exposed in the Kernel32 interface already.

已经被要求使用JNA 确定其他Java进程的进程ID ，并且应该是可以理解的。

Determining the process id of the other java processes using JNA has been asked already, and should be understandable.

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