Windows XP和Windows 7中WaitForSingleObject的不同行为 [英] Different behavior for WaitForSingleObject in Windows XP and Windows 7

问题描述

我正在开发一个sofPLC程序，基本上，它通过以下步骤执行循环：

1）从I / O卡读取数据

2）执行我们的控制程序

3）将输出写入I / O卡

4）睡眠短时间

5）返回（1）

使用WaitForSingleObject实现步骤4（短暂睡眠）（阻止虚拟手柄并等待配置的超时，通常为5毫秒）。 MMC配置为最高精度（1毫秒）。此过程的优先级设置为
到REAL_TIME，线程优先级设置为最高。

在Windows XP中，实际的睡眠时间总是少于超过20毫秒，，但在Windows 7中这个时间是100毫秒!! 。

我知道Windows不是实时操作系统，但我不知道为什么在Windows 7这次与Windows如此不同XP。

我尝试过其他选项，如Sleep或SetWaitableTime，但我得到了相似的时间。甚至，我试图改变处理器亲和力，但我无法改善这些时间。

是否有任何方法可以知道哪个进程/线程阻塞了我的线程？

Windows 7是否更改了进程/线程调度程序（来自Windows XP？

谢谢!!

解决方案

您好，¥b $ b欢迎光临。

根据您的描述，我将把这个帖子移到一个更合适的论坛：Windows桌面SDK。

感谢您的理解。

问候，

I work developing a sofPLC program that, basically, it executes a loop with the following steps:

1) Reads data from an I/O card

2) Execute our control program

3) Write outputs to an I/O cards

4) Sleep for a short time

5) Back to (1)

Step 4 (Sleep for a short time) is implemented using WaitForSingleObject (blocking over a dummy handle and waiting for the configured timeout, that usually is 5 ms). The MMC is configured to the highest precision (1 ms). The priority of this process is set to REAL_TIME and the thread priority the hightest.

In Windows XP, the real sleep time is always less than 20 ms, but in Windows 7 this time is up 100 ms !!.

I know that Windows is not a realtime OS, but I don't know why in Windows 7 this time is so different from Windows XP.

I have tried other option such as Sleep or SetWaitableTime but I get similar times. Even, I tried to change the processor affinity but I can not improve these times.

Does exists any way to know which process/thread is blocking my thread?

Has Windows 7 changed the process/thread scheduler (from Windows XP?

Thanks !!

解决方案

Hello,
Welcome here.

Based on your description, I will move this thread to a more appropriate forum: Windows Desktop SDK.

Thanks for your understanding.
Regards,

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