Stopwatch.cs

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using System.Runtime.CompilerServices;
 
namespace System.Diagnostics;
 
public class Stopwatch
{
    private long _elapsed;
 
    private long _startTimeStamp;
 
    private bool _isRunning;
 
    public static readonly long Frequency = QueryPerformanceFrequency();
 
    public static readonly bool IsHighResolution = true;
 
    private static readonly double s_tickFrequency = 10000000.0 / (double)Frequency;
 
    public bool IsRunning => _isRunning;
 
    public TimeSpan Elapsed => new TimeSpan(GetElapsedDateTimeTicks());
 
    public long ElapsedMilliseconds => GetElapsedDateTimeTicks() / 10000;
 
    public long ElapsedTicks => GetRawElapsedTicks();
 
    public Stopwatch()
    {
        Reset();
    }
 
    public void Start()
    {
        if (!_isRunning)
        {
            _startTimeStamp = GetTimestamp();
            _isRunning = true;
        }
    }
 
    public static Stopwatch StartNew()
    {
        Stopwatch stopwatch = new Stopwatch();
        stopwatch.Start();
        return stopwatch;
    }
 
    public void Stop()
    {
        if (_isRunning)
        {
            long timestamp = GetTimestamp();
            long num = timestamp - _startTimeStamp;
            _elapsed += num;
            _isRunning = false;
            if (_elapsed < 0)
            {
                _elapsed = 0L;
            }
        }
    }
 
    public void Reset()
    {
        _elapsed = 0L;
        _isRunning = false;
        _startTimeStamp = 0L;
    }
 
    public void Restart()
    {
        _elapsed = 0L;
        _startTimeStamp = GetTimestamp();
        _isRunning = true;
    }
 
    public static long GetTimestamp()
    {
        return QueryPerformanceCounter();
    }
 
    private long GetRawElapsedTicks()
    {
        long num = _elapsed;
        if (_isRunning)
        {
            long timestamp = GetTimestamp();
            long num2 = timestamp - _startTimeStamp;
            num += num2;
        }
        return num;
    }
 
    private long GetElapsedDateTimeTicks()
    {
        return (long)((double)GetRawElapsedTicks() * s_tickFrequency);
    }
 
    private unsafe static long QueryPerformanceFrequency()
    {
        System.Runtime.CompilerServices.Unsafe.SkipInit(out long result);
        Interop.BOOL bOOL = Interop.Kernel32.QueryPerformanceFrequency(&result);
        return result;
    }
 
    private unsafe static long QueryPerformanceCounter()
    {
        System.Runtime.CompilerServices.Unsafe.SkipInit(out long result);
        Interop.BOOL bOOL = Interop.Kernel32.QueryPerformanceCounter(&result);
        return result;
    }
}