using System;
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using System.Diagnostics;
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namespace Cysharp.Threading.Tasks.Internal
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{
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internal readonly struct ValueStopwatch
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{
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static readonly double TimestampToTicks = TimeSpan.TicksPerSecond / (double)Stopwatch.Frequency;
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readonly long startTimestamp;
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public static ValueStopwatch StartNew() => new ValueStopwatch(Stopwatch.GetTimestamp());
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ValueStopwatch(long startTimestamp)
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{
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this.startTimestamp = startTimestamp;
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}
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public TimeSpan Elapsed => TimeSpan.FromTicks(this.ElapsedTicks);
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public bool IsInvalid => startTimestamp == 0;
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public long ElapsedTicks
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{
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get
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{
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if (startTimestamp == 0)
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{
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throw new InvalidOperationException("Detected invalid initialization(use 'default'), only to create from StartNew().");
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}
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var delta = Stopwatch.GetTimestamp() - startTimestamp;
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return (long)(delta * TimestampToTicks);
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}
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}
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}
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}
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