C# timeBeginPeriod在英特尔Comet Lake CPU上不工作(i5 10400H)
我的应用程序中有一些操作依赖于短计时器。使用下面的示例代码,我可以根据需要每5毫秒触发一次计时器 在Intel i5 10400H CPU上,观察到计时关闭,回调在约15毫秒(或15的倍数)后发生。使用ClockRes sysinternals工具表明,即使在以下代码中调用C# timeBeginPeriod在英特尔Comet Lake CPU上不工作(i5 10400H),c#,windows,winapi,intel,C#,Windows,Winapi,Intel,我的应用程序中有一些操作依赖于短计时器。使用下面的示例代码,我可以根据需要每5毫秒触发一次计时器 在Intel i5 10400H CPU上,观察到计时关闭,回调在约15毫秒(或15的倍数)后发生。使用ClockRes sysinternals工具表明,即使在以下代码中调用timeBeginPeriod(1)后运行,机器的系统计时器分辨率也为15ms 使用将分辨率设置为支持的最大值(0.5ms)不会改变示例代码的行为 从我所看到的情况来看,机器正在使用不变的TSC acpi计时器,强制它使用HP
timeBeginPeriod(1)
后运行,机器的系统计时器分辨率也为15ms
使用将分辨率设置为支持的最大值(0.5ms)不会改变示例代码的行为
从我所看到的情况来看,机器正在使用不变的TSC acpi计时器,强制它使用HPET(使用bcdedit/set useplatformclock true
并重新启动)并没有改变行为
我在CPU文档或勘误表中看不到任何可以解释这一点的内容
我不知道问题出在哪里,如果是我这边可以解决的问题,有什么想法吗
编辑:打开这个程序()会在预期的时候触发计时器队列,所以它是可解的
示例代码:
using System;
using System.ComponentModel;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Threading;
namespace ConsoleApp1
{
class Program
{
static void Main(string[] args)
{
using (new TimePeriod(1))
RunTimer();
}
public static void RunTimer()
{
var completionEvent = new ManualResetEvent(false);
var stopwatch = Stopwatch.StartNew();
var i = 0;
var previous = 0L;
using var x = TimerQueue.Default.CreateTimer((s) =>
{
if (i > 100)
completionEvent.Set();
i++;
var now = stopwatch.ElapsedMilliseconds;
var gap = now - previous;
previous = now;
Console.WriteLine($"Gap: {gap}ms");
}, "", 10, 5);
completionEvent.WaitOne();
}
}
public class TimerQueueTimer : IDisposable
{
private TimerQueue MyQueue;
private TimerCallback Callback;
private object UserState;
private IntPtr Handle;
internal TimerQueueTimer(
TimerQueue queue,
TimerCallback cb,
object state,
uint dueTime,
uint period,
TimerQueueTimerFlags flags)
{
MyQueue = queue;
Callback = cb;
UserState = state;
bool rslt = TQTimerWin32.CreateTimerQueueTimer(
out Handle,
MyQueue.Handle,
TimerCallback,
IntPtr.Zero,
dueTime,
period,
flags);
if (!rslt)
{
throw new Win32Exception(Marshal.GetLastWin32Error(), "Error creating timer.");
}
}
~TimerQueueTimer()
{
Dispose(false);
}
public void Change(uint dueTime, uint period)
{
bool rslt = TQTimerWin32.ChangeTimerQueueTimer(MyQueue.Handle, ref Handle, dueTime, period);
if (!rslt)
{
throw new Win32Exception(Marshal.GetLastWin32Error(), "Error changing timer.");
}
}
private void TimerCallback(IntPtr state, bool bExpired)
{
Callback.Invoke(UserState);
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
private IntPtr completionEventHandle = new IntPtr(-1);
public void Dispose(WaitHandle completionEvent)
{
completionEventHandle = completionEvent.SafeWaitHandle.DangerousGetHandle();
this.Dispose();
}
private bool disposed = false;
protected virtual void Dispose(bool disposing)
{
if (!disposed)
{
bool rslt = TQTimerWin32.DeleteTimerQueueTimer(MyQueue.Handle,
Handle, completionEventHandle);
if (!rslt)
{
throw new Win32Exception(Marshal.GetLastWin32Error(), "Error deleting timer.");
}
disposed = true;
}
}
}
public class TimerQueue : IDisposable
{
public IntPtr Handle { get; private set; }
public static TimerQueue Default { get; private set; }
static TimerQueue()
{
Default = new TimerQueue(IntPtr.Zero);
}
private TimerQueue(IntPtr handle)
{
Handle = handle;
}
public TimerQueue()
{
Handle = TQTimerWin32.CreateTimerQueue();
if (Handle == IntPtr.Zero)
{
throw new Win32Exception(Marshal.GetLastWin32Error(), "Error creating timer queue.");
}
}
~TimerQueue()
{
Dispose(false);
}
public TimerQueueTimer CreateTimer(
TimerCallback callback,
object state,
uint dueTime,
uint period)
{
return CreateTimer(callback, state, dueTime, period, TimerQueueTimerFlags.ExecuteInPersistentThread);
}
public TimerQueueTimer CreateTimer(
TimerCallback callback,
object state,
uint dueTime,
uint period,
TimerQueueTimerFlags flags)
{
return new TimerQueueTimer(this, callback, state, dueTime, period, flags);
}
private IntPtr CompletionEventHandle = new IntPtr(-1);
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
public void Dispose(WaitHandle completionEvent)
{
CompletionEventHandle = completionEvent.SafeWaitHandle.DangerousGetHandle();
Dispose();
}
private bool Disposed = false;
protected virtual void Dispose(bool disposing)
{
if (!Disposed)
{
if (Handle != IntPtr.Zero)
{
bool rslt = TQTimerWin32.DeleteTimerQueueEx(Handle, CompletionEventHandle);
if (!rslt)
{
int err = Marshal.GetLastWin32Error();
throw new Win32Exception(err, "Error disposing timer queue");
}
}
Disposed = true;
}
}
}
public enum TimerQueueTimerFlags : uint
{
ExecuteDefault = 0x0000,
ExecuteInTimerThread = 0x0020,
ExecuteInIoThread = 0x0001,
ExecuteInPersistentThread = 0x0080,
ExecuteLongFunction = 0x0010,
ExecuteOnlyOnce = 0x0008,
TransferImpersonation = 0x0100,
}
public delegate void Win32WaitOrTimerCallback(
IntPtr lpParam,
[MarshalAs(UnmanagedType.U1)] bool bTimedOut);
static public class TQTimerWin32
{
[DllImport("kernel32.dll", SetLastError = true)]
public extern static IntPtr CreateTimerQueue();
[DllImport("kernel32.dll", SetLastError = true)]
public extern static bool DeleteTimerQueue(IntPtr timerQueue);
[DllImport("kernel32.dll", SetLastError = true)]
public extern static bool DeleteTimerQueueEx(IntPtr timerQueue, IntPtr completionEvent);
[DllImport("kernel32.dll", SetLastError = true)]
public extern static bool CreateTimerQueueTimer(
out IntPtr newTimer,
IntPtr timerQueue,
Win32WaitOrTimerCallback callback,
IntPtr userState,
uint dueTime,
uint period,
TimerQueueTimerFlags flags);
[DllImport("kernel32.dll", SetLastError = true)]
public extern static bool ChangeTimerQueueTimer(
IntPtr timerQueue,
ref IntPtr timer,
uint dueTime,
uint period);
[DllImport("kernel32.dll", SetLastError = true)]
public extern static bool DeleteTimerQueueTimer(
IntPtr timerQueue,
IntPtr timer,
IntPtr completionEvent);
}
public sealed class TimePeriod : IDisposable
{
private const string WINMM = "winmm.dll";
private static TIMECAPS timeCapabilities;
private static int inTimePeriod;
private readonly int period;
private int disposed;
[DllImport(WINMM, ExactSpelling = true)]
private static extern int timeGetDevCaps(ref TIMECAPS ptc, int cbtc);
[DllImport(WINMM, ExactSpelling = true)]
private static extern int timeBeginPeriod(int uPeriod);
[DllImport(WINMM, ExactSpelling = true)]
private static extern int timeEndPeriod(int uPeriod);
static TimePeriod()
{
int result = timeGetDevCaps(ref timeCapabilities, Marshal.SizeOf(typeof(TIMECAPS)));
if (result != 0)
{
throw new InvalidOperationException("The request to get time capabilities was not completed because an unexpected error with code " + result + " occured.");
}
}
internal TimePeriod(int period)
{
if (Interlocked.Increment(ref inTimePeriod) != 1)
{
Interlocked.Decrement(ref inTimePeriod);
throw new NotSupportedException("The process is already within a time period. Nested time periods are not supported.");
}
if (period < timeCapabilities.wPeriodMin || period > timeCapabilities.wPeriodMax)
{
throw new ArgumentOutOfRangeException("period", "The request to begin a time period was not completed because the resolution specified is out of range.");
}
int result = timeBeginPeriod(period);
if (result != 0)
{
throw new InvalidOperationException("The request to begin a time period was not completed because an unexpected error with code " + result + " occured.");
}
this.period = period;
}
internal static int MinimumPeriod
{
get
{
return timeCapabilities.wPeriodMin;
}
}
internal static int MaximumPeriod
{
get
{
return timeCapabilities.wPeriodMax;
}
}
internal int Period
{
get
{
if (this.disposed > 0)
{
throw new ObjectDisposedException("The time period instance has been disposed.");
}
return this.period;
}
}
public void Dispose()
{
if (Interlocked.Increment(ref this.disposed) == 1)
{
timeEndPeriod(this.period);
Interlocked.Decrement(ref inTimePeriod);
}
else
{
Interlocked.Decrement(ref this.disposed);
}
}
[StructLayout(LayoutKind.Sequential)]
private struct TIMECAPS
{
internal int wPeriodMin;
internal int wPeriodMax;
}
}
}
使用系统;
使用系统组件模型;
使用系统诊断;
使用System.Runtime.InteropServices;
使用系统线程;
名称空间控制台EAPP1
{
班级计划
{
静态void Main(字符串[]参数)
{
使用(新时间段(1))
运行计时器();
}
公共静态void RunTimer()
{
var completionEvent=新手动重置事件(假);
var stopwatch=stopwatch.StartNew();
var i=0;
var先前=0升;
使用var x=TimerQueue.Default.CreateTimer((s)=>
{
如果(i>100)
completionEvent.Set();
i++;
var now=stopwatch.elapsedmillisons;
var gap=现在-以前;
以前=现在;
WriteLine($“Gap:{Gap}ms”);
}, "", 10, 5);
completionEvent.WaitOne();
}
}
公共类计时器队列计时器:IDisposable
{
专用计时器队列MyQueue;
专用TimerCallback回调;
私有对象用户状态;
私有IntPtr句柄;
内部计时器队列计时器(
计时器队列,
TimerCallback cb,
对象状态,
二重唱时,
新时期,
TimerQueueTimerFlags标志)
{
MyQueue=队列;
回调=cb;
用户状态=状态;
bool rslt=TQTimerWin32.CreateTimerQueueTimer(
出格,
MyQueue.Handle,
时光倒流,
IntPtr.Zero,
决斗时间,
时期
旗帜);
如果(!rslt)
{
抛出新的Win32Exception(Marshal.GetLastWin32Error(),“创建计时器时出错”);
}
}
~TimerQueueTimer()
{
处置(虚假);
}
公共无效更改(uint dueTime、uint period)
{
bool rslt=TQTimerWin32.ChangeTimerQueueTimer(MyQueue.Handle,ref Handle,dueTime,period);
如果(!rslt)
{
抛出新的Win32Exception(Marshal.GetLastWin32Error(),“错误更改计时器”);
}
}
专用void TimerCallback(IntPtr状态,bool bExpired)
{
调用(UserState);
}
公共空间处置()
{
处置(真实);
总干事(本);
}
私有IntPtr completionEventHandle=new IntPtr(-1);
public void Dispose(WaitHandle completionEvent)
{
completionEventHandle=completionEvent.SafeWaitHandle.DangerousGetHandle();
这个。Dispose();
}
私有布尔=假;
受保护的虚拟void Dispose(bool disposing)
{
如果(!已处置)
{
bool rslt=TQTimerWin32.DeleteTimerQueueTimer(MyQueue.Handle,
句柄,completionEventHandle);
如果(!rslt)
{
抛出新的Win32Exception(Marshal.GetLastWin32Error(),“删除计时器时出错”);
}
这是真的;
}
}
}
公共类计时器队列:IDisposable
{
公共IntPtr句柄{get;private set;}
公共静态计时器队列默认值{get;private set;}
静态计时器队列()
{
默认值=新定时器队列(IntPtr.Zero);
}
专用计时器队列(IntPtr句柄)
{
把手=把手;
}
公共计时器队列()
{
Handle=TQTimerWin32.CreateTimerQueue();
if(Handle==IntPtr.Zero)
{
抛出新的Win32Exception(Marshal.GetLastWin32Error(),“创建计时器队列时出错”);
}
}
~TimerQueue()
{
处置(虚假);
}
公共计时器队列计时器创建计时器(
TimerCallback回调,
对象状态,
二重唱时,
(休止期)
{
返回CreateTimer(回调、状态、dueTime、时段、TimerQueueTimerFlags.ExecuteInputPersistentThread);
}
公共计时器队列计时器创建计时器(
TimerCallback回调,
对象状态,
二重唱时,
新时期,
TimerQueueTimerFlags标志)
{
返回新的TimerQueueTimer(this、回调、状态、dueTime、句点、标志);
}
私有IntPtr CompletionEventHandle=new IntPtr(-1);
公共空间处置()
{
处置(真实);
总干事(本);
}
public void Dispose(WaitHandle completionEvent)
{
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