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tclsMicroTimer.cs
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tclsMicroTimer.cs
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/******************************************************************************/
/* Copyright (c) 2021 MD Automotive Controls. Original Work. */
/* License: http://www.gnu.org/licenses/gpl.html GPL version 2 or higher */
/******************************************************************************/
/* CONTEXT:APP */
/* PACKAGE TITLE: Timer */
/* DESCRIPTION: */
/* FILE NAME: tclsMicroTimer.cs */
/* REVISION HISTORY: 22-02-2021 | 1.0 | Initial revision */
/* */
/******************************************************************************/
using System;
namespace MicroLibrary
{
/// <summary>
/// MicroStopwatch class
/// </summary>
public class MicroStopwatch : System.Diagnostics.Stopwatch
{
readonly double _microSecPerTick =
1000000D / System.Diagnostics.Stopwatch.Frequency;
public MicroStopwatch()
{
if (!System.Diagnostics.Stopwatch.IsHighResolution)
{
throw new Exception("On this system the high-resolution " +
"performance counter is not available");
}
}
public long ElapsedMicroseconds
{
get
{
return (long)(ElapsedTicks * _microSecPerTick);
}
}
}
/// <summary>
/// MicroTimer class
/// </summary>
public class MicroTimer
{
public delegate void MicroTimerElapsedEventHandler(
object sender,
MicroTimerEventArgs timerEventArgs);
public event MicroTimerElapsedEventHandler MicroTimerElapsed;
public System.Threading.Thread _threadTimer = null;
//long _ignoreEventIfLateBy = long.MaxValue;
long _ignoreEventIfLateBy = 100;
long _timerIntervalInMicroSec = 0;
bool _stopTimer = true;
public MicroTimer()
{
}
public MicroTimer(long timerIntervalInMicroseconds)
{
Interval = timerIntervalInMicroseconds;
}
public long Interval
{
get
{
return System.Threading.Interlocked.Read(
ref _timerIntervalInMicroSec);
}
set
{
System.Threading.Interlocked.Exchange(
ref _timerIntervalInMicroSec, value);
}
}
public long IgnoreEventIfLateBy
{
get
{
return System.Threading.Interlocked.Read(
ref _ignoreEventIfLateBy);
}
set
{
System.Threading.Interlocked.Exchange(
ref _ignoreEventIfLateBy, value <= 0 ? long.MaxValue : value);
}
}
public bool Enabled
{
set
{
if (value)
{
Start();
}
else
{
Stop();
}
}
get
{
return (_threadTimer != null && _threadTimer.IsAlive);
}
}
public void Start()
{
if (Enabled || Interval <= 0)
{
return;
}
_stopTimer = false;
System.Threading.ThreadStart threadStart = delegate()
{
NotificationTimer(ref _timerIntervalInMicroSec,
ref _ignoreEventIfLateBy,
ref _stopTimer);
};
_threadTimer = new System.Threading.Thread(threadStart);
_threadTimer.Priority = System.Threading.ThreadPriority.Highest;
_threadTimer.Start();
}
public void Stop()
{
_stopTimer = true;
}
public void StopAndWait()
{
StopAndWait(System.Threading.Timeout.Infinite);
}
public bool StopAndWait(int timeoutInMilliSec)
{
_stopTimer = true;
if (!Enabled || _threadTimer.ManagedThreadId ==
System.Threading.Thread.CurrentThread.ManagedThreadId)
{
return true;
}
return _threadTimer.Join(timeoutInMilliSec);
}
public void Abort()
{
_stopTimer = true;
if (Enabled)
{
//_threadTimer.Abort();
}
}
void NotificationTimer(ref long timerIntervalInMicroSec,
ref long ignoreEventIfLateBy,
ref bool stopTimer)
{
int timerCount = 0;
long nextNotification = 0;
MicroStopwatch microStopwatch = new MicroStopwatch();
microStopwatch.Start();
while (!stopTimer)
{
long callbackFunctionExecutionTime =
microStopwatch.ElapsedMicroseconds - nextNotification;
long timerIntervalInMicroSecCurrent =
System.Threading.Interlocked.Read(ref timerIntervalInMicroSec);
long ignoreEventIfLateByCurrent =
System.Threading.Interlocked.Read(ref ignoreEventIfLateBy);
nextNotification += timerIntervalInMicroSecCurrent;
timerCount++;
long elapsedMicroseconds = 0;
while ( (elapsedMicroseconds = microStopwatch.ElapsedMicroseconds)
< nextNotification)
{
//System.Threading.Thread.SpinWait(10);
System.Threading.Thread.Sleep(1);
}
long timerLateBy = elapsedMicroseconds - nextNotification;
//if (timerLateBy >= ignoreEventIfLateByCurrent)
//{
// nextNotification += timerIntervalInMicroSecCurrent;
//}
//else
{
MicroTimerEventArgs microTimerEventArgs =
new MicroTimerEventArgs(timerCount,
elapsedMicroseconds,
timerLateBy,
callbackFunctionExecutionTime);
MicroTimerElapsed(this, microTimerEventArgs);
}
}
microStopwatch.Stop();
}
}
/// <summary>
/// MicroTimer Event Argument class
/// </summary>
public class MicroTimerEventArgs : EventArgs
{
// Simple counter, number times timed event (callback function) executed
public int TimerCount;// { get; private set; }
// Time when timed event was called since timer started
public long ElapsedMicroseconds;// { get; private set; }
// How late the timer was compared to when it should have been called
public long TimerLateBy;// { get; private set; }
// Time it took to execute previous call to callback function (OnTimedEvent)
public long CallbackFunctionExecutionTime;// { get; private set; }
public MicroTimerEventArgs(int timerCount,
long elapsedMicroseconds,
long timerLateBy,
long callbackFunctionExecutionTime)
{
TimerCount = timerCount;
ElapsedMicroseconds = elapsedMicroseconds;
TimerLateBy = timerLateBy;
CallbackFunctionExecutionTime = callbackFunctionExecutionTime;
}
}
}