如何确定当前的 Windows 计时器分辨率? [英] How to determine the current Windows timer resolution?

问题描述

这可能很明显，但我无法找到/google 获取计时器分辨率的当前系统值的正确方法，程序可以通过 timeBeginPeriod(n)/timeEndPeriod(n) 设置该值.我想知道当前的分辨率是多少... Windows 7 默认值似乎是 15.6 毫秒，但其他应用程序或机器供应商可能已更改设置.

有一些工具可以报告该值，但我需要在应用程序中读取该值.

感谢您提供任何快速提示或链接.C# 会是一个加分项，但我知道如何使用 答案中有更多细节.

It might be obvious, but I can't find/google the correct method to get the current system value of the timer resolution, which a program can set by timeBeginPeriod(n)/timeEndPeriod(n). I want to find out what's the current resolution... The Windows 7 default value seems to be 15.6 ms, but other applications or the machine vendor might have changed the setting.

There are some tools which report the value, but I need to read the value in an application.

Thanks for any quick hint or link. C# would be a plus, but I know my way around with P/Invoke.

EDIT: Thanks to the answer I've made a little tool in C# which uses the described method: github.com/tebjan/TimerTool

解决方案

Windows timer resolution is provided by the hidden API call:

NTSTATUS NtQueryTimerResolution(OUT PULONGMinimumResolution, 
                                OUT LONGMaximumResolution, 
                                OUT PULONGActualResolution);

NtQueryTimerResolution is exported by the native Windows NT library NTDLL.DLL.

Common hardware platforms report 156,250 or 100,144 for ActualResolution; older platforms may report even larger numbers; newer systems, particulary when HPET (High Precision Event Timer) or constant/invariant TSC are supported, may return 156,001 for ActualResolution.

Calls to timeBeginPeriod(n) are reflected in ActualResolution.

More details in this answer.

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