如何获取当前 Windows 系统范围的计时器分辨率 [英] How to get the current Windows system-wide timer resolution

问题描述

我知道默认值是每滴答 15.6 毫秒，但有些失败者可能会更改它，然后一次又一次地来回更改，我需要轮询当前值以执行有效的 QueryPerformanceCounter 同步.

I know that the default is 15.6 ms per tick, but some loser may change it and then change back and forth again and again, and I need to poll what the current value is to perform valid QueryPerformanceCounter synchronization.

那么有没有获取定时器分辨率的 API 方法?

So is there an API way to get the timer resolution?

顺便说一句，我在使用 C++.

I'm on C++ BTW.

推荐答案

Windows 计时器解析由隐藏的 API 调用提供:

Windows timer resolution is provided by the hidden API call:

NTSTATUS NtQueryTimerResolution(OUT PULONG MinimumResolution, 
                                OUT PULONG MaximumResolution, 
                                OUT PULONG ActualResolution);

NtQueryTimerResolution 由本地 Windows NT 库 NTDLL.DLL 导出.

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

常见硬件平台为 ActualResolution 报告 156,250 或 100,144；较旧的平台可能会报告更大的数字；较新的系统，尤其是在支持 HPET(高精度事件计时器)或恒定/不变 TSC 时，可能会为 ActualResolution 返回 156,001.

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.

对 timeBeginPeriod(n) 的调用反映在 ActualResolution 中.

Calls to timeBeginPeriod(n) are reflected in ActualResolution.

在这个答案中有更多细节.

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