.net - TimeBeginPeriod / TimeEndPeriod 序列
问题描述
我有两个 Windows .NET 库 A 和 B。库 A 有 TimeBeginPeriod(1) 和 TimeEndPeriod(1),而库 B 有 TimeBeginPeriod(5) 和 TimeEndPeriod(5)。我最近注意到(在他们的行为改变之后),当库 B 将执行 TimeEndPeriod(5) 时,库 A 失去了 TimeBeginPeriod(1)。
你可以在同一个应用程序中有不同的时间段而不影响另一个吗?我的意思是我不介意 (5) 是否会受到 (1) 的影响,但至关重要的是 end(5) 不会影响 begin(1)!
LibA TimeBeginPeriod(1)
.... LibB TimeBeginPeriod(5)
.... LibB TimeEndPeriod(5) <- Does this cancel TimeBeginPeriod(1)?
LibA TimeEndPeriod(1)
[更新]
测试代码
using System;
using System.Runtime.InteropServices;
using System.Threading;
namespace ConsoleApp1
{
class Program
{
static long freq;
static void Main(string[] args)
{
QueryPerformanceFrequency(out freq);
Console.WriteLine("Begin");
Console.WriteLine(CalcSleep1());
Console.WriteLine(CalcSleep1());
TimeBeginPeriod(1);
Console.WriteLine("TimeBeginPeriod(1)");
Thread.Sleep(5000);
Console.WriteLine(CalcSleep1());
Console.WriteLine(CalcSleep1());
Console.WriteLine(CalcSleep1());
Console.WriteLine(CalcSleep1());
Console.WriteLine(CalcSleep1());
TimeBeginPeriod(15);
Console.WriteLine("TimeBeginPeriod(15)");
Thread.Sleep(5000);
Console.WriteLine(CalcSleep1());
Console.WriteLine(CalcSleep1());
Console.WriteLine(CalcSleep1());
Console.WriteLine(CalcSleep1());
Console.WriteLine(CalcSleep1());
Console.WriteLine("TimeEndPeriod(15)");
TimeEndPeriod(15);
Thread.Sleep(5000);
Console.WriteLine(CalcSleep1());
Console.WriteLine(CalcSleep1());
Console.WriteLine(CalcSleep1());
Console.WriteLine(CalcSleep1());
Console.WriteLine(CalcSleep1());
TimeEndPeriod(1);
Console.WriteLine("TimeEndPeriod(1)");
Console.WriteLine(CalcSleep1());
Console.WriteLine(CalcSleep1());
Console.WriteLine("End");
}
private static string CalcSleep1()
{
QueryPerformanceCounter(out long ticks1);
Thread.Sleep(1);
QueryPerformanceCounter(out long ticks2);
return (new TimeSpan((long)(1000 * 10000 * (ticks2 - ticks1) / (double)freq))).ToString();
}
[DllImport("Kernel32.dll")]
private static extern bool QueryPerformanceCounter(out long lpPerformanceCount);
[DllImport("Kernel32.dll")]
private static extern bool QueryPerformanceFrequency(out long lpFrequency);
[DllImport("winmm.dll", EntryPoint = "timeBeginPeriod", SetLastError = true)]
public static extern uint TimeBeginPeriod(uint uMilliseconds);
[DllImport("winmm.dll", EntryPoint = "timeEndPeriod", SetLastError = true)]
public static extern uint TimeEndPeriod(uint uMilliseconds);
[DllImport("winmm.dll", ExactSpelling = true)]
private static extern int timeGetDevCaps(ref TIMECAPS ptc, int cbtc);
[StructLayout(LayoutKind.Sequential)]
private struct TIMECAPS
{
internal int wPeriodMin;
internal int wPeriodMax;
}
}
}
输出
Begin
00:00:00.0130730
00:00:00.0154164
TimeBeginPeriod(1)
00:00:00.0019935
00:00:00.0019148
00:00:00.0019145
00:00:00.0019203
00:00:00.0023354
TimeBeginPeriod(15)
00:00:00.0019916
00:00:00.0018920
00:00:00.0019412
00:00:00.0019411
00:00:00.0019336
TimeEndPeriod(15)
00:00:00.0019918
00:00:00.0019300
00:00:00.0019671
00:00:00.0019524
00:00:00.0019399
TimeEndPeriod(1)
00:00:00.0152576
00:00:00.0148129
End
似乎介于 TimeBeginPeriod(15) / TimeEndPeriod(15) 之间的时间不会影响 TimeBeginPeriod(1)。除非这只发生在不同的程序集上(尚未测试)
解决方案
通过用一个较小的示例编写我的应用程序逻辑,我能够重现并识别一个严重的 Windows 错误。当您动态加载程序集时会发生这种情况。您可以在此处下载解决方案和/或编译
更新:它发生在静态/动态上。当全局定时器改变时,它有不同的行为。我的应用程序正在做的是 Windows 不喜欢的以下内容:
.... LibB TimeBeginPeriod(5)
LibA TimeBeginPeriod(1)
.... LibB TimeEndPeriod(5) <- This affects TimeBeginPeriod(1) goes back to 15ms - and it happens when the global timer is already to 1ms? -
LibA TimeEndPeriod(1)
我敢打赌这个问题会影响许多应用程序,因为他们并不真正知道底层库对时间段做了什么。
(将 Class12 dll 复制到控制台应用程序输出)
11 类
using System;
using System.Runtime.InteropServices;
using System.Threading;
namespace ClassLibrary1
{
public abstract class ClassAbstract
{
public abstract void StartSample(uint ms);
public abstract void EndSample(uint ms);
public abstract void PrintSample();
}
public class Class11
{
static long freq;
public Class11()
{
QueryPerformanceFrequency(out freq);
}
private static string CalcSleep1()
{
QueryPerformanceCounter(out long ticks1);
Thread.Sleep(1);
QueryPerformanceCounter(out long ticks2);
return (new TimeSpan((long)(1000 * 10000 * (ticks2 - ticks1) / (double)freq))).ToString();
}
public void StartSample(uint ms)
{
TimeBeginPeriod(ms);
Console.WriteLine($"TimeBeginPeriod({ms})");
PrintSample();
}
public void EndSample(uint ms)
{
Console.WriteLine($"TimeEndPeriod({ms})");
TimeEndPeriod(ms);
}
public void PrintSample()
{
Console.WriteLine(CalcSleep1());
Console.WriteLine(CalcSleep1());
Console.WriteLine(CalcSleep1());
Console.WriteLine(CalcSleep1());
Console.WriteLine(CalcSleep1());
}
[DllImport("Kernel32.dll")]
private static extern bool QueryPerformanceCounter(out long lpPerformanceCount);
[DllImport("Kernel32.dll")]
private static extern bool QueryPerformanceFrequency(out long lpFrequency);
[DllImport("winmm.dll", EntryPoint = "timeBeginPeriod", SetLastError = true)]
public static extern uint TimeBeginPeriod(uint uMilliseconds);
[DllImport("winmm.dll", EntryPoint = "timeEndPeriod", SetLastError = true)]
public static extern uint TimeEndPeriod(uint uMilliseconds);
}
}
12级
using System;
using System.Runtime.InteropServices;
using System.Threading;
using ClassLibrary1;
namespace ClassLibrary2
{
public class Class12 : ClassAbstract
{
static long freq;
public Class12()
{
QueryPerformanceFrequency(out freq);
}
private static string CalcSleep1()
{
QueryPerformanceCounter(out long ticks1);
Thread.Sleep(1);
QueryPerformanceCounter(out long ticks2);
return (new TimeSpan((long)(1000 * 10000 * (ticks2 - ticks1) / (double)freq))).ToString();
}
public override void StartSample(uint ms)
{
TimeBeginPeriod(ms);
Console.WriteLine($"TimeBeginPeriod({ms})");
PrintSample();
}
public override void EndSample(uint ms)
{
Console.WriteLine($"TimeEndPeriod({ms})");
TimeEndPeriod(ms);
}
public override void PrintSample()
{
Console.WriteLine(CalcSleep1());
Console.WriteLine(CalcSleep1());
Console.WriteLine(CalcSleep1());
Console.WriteLine(CalcSleep1());
Console.WriteLine(CalcSleep1());
}
[DllImport("Kernel32.dll")]
private static extern bool QueryPerformanceCounter(out long lpPerformanceCount);
[DllImport("Kernel32.dll")]
private static extern bool QueryPerformanceFrequency(out long lpFrequency);
[DllImport("winmm.dll", EntryPoint = "timeBeginPeriod", SetLastError = true)]
public static extern uint TimeBeginPeriod(uint uMilliseconds);
[DllImport("winmm.dll", EntryPoint = "timeEndPeriod", SetLastError = true)]
public static extern uint TimeEndPeriod(uint uMilliseconds);
}
}
控制台应用程序
using System;
using System.IO;
using System.Reflection;
using ClassLibrary1;
namespace ConsoleApp1
{
class Program
{
static Class11 class11;
static ClassAbstract class12;
static void Main(string[] args)
{
class11 = new Class11();
var assembly = Assembly.LoadFrom(Path.GetFullPath(@"ClassLibrary2.dll"));
ClassAbstract class12 = (ClassAbstract) Activator.CreateInstance(assembly.GetTypes()[0]);
// Behavior changes while System global time period changes
class12.StartSample(5); // Bug here we get 1ms instead of 5ms
class11.StartSample(1);
class12.EndSample(5);
class11.PrintSample(); // Bug Here we get 15 ms period instead of 1ms
class11.EndSample(1);
}
}
}
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