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//-----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
namespace System.Runtime
{
using System;
using System.Threading;
struct TimeoutHelper
{
DateTime deadline;
bool deadlineSet;
TimeSpan originalTimeout;
public static readonly TimeSpan MaxWait = TimeSpan.FromMilliseconds(Int32.MaxValue);
public TimeoutHelper(TimeSpan timeout)
{
Fx.Assert(timeout >= TimeSpan.Zero, "timeout must be non-negative");
this.originalTimeout = timeout;
this.deadline = DateTime.MaxValue;
this.deadlineSet = (timeout == TimeSpan.MaxValue);
}
public TimeSpan OriginalTimeout
{
get { return this.originalTimeout; }
}
public static bool IsTooLarge(TimeSpan timeout)
{
return (timeout > TimeoutHelper.MaxWait) && (timeout != TimeSpan.MaxValue);
}
public static TimeSpan FromMilliseconds(int milliseconds)
{
if (milliseconds == Timeout.Infinite)
{
return TimeSpan.MaxValue;
}
else
{
return TimeSpan.FromMilliseconds(milliseconds);
}
}
public static int ToMilliseconds(TimeSpan timeout)
{
if (timeout == TimeSpan.MaxValue)
{
return Timeout.Infinite;
}
else
{
long ticks = Ticks.FromTimeSpan(timeout);
if (ticks / TimeSpan.TicksPerMillisecond > int.MaxValue)
{
return int.MaxValue;
}
return Ticks.ToMilliseconds(ticks);
}
}
public static TimeSpan Min(TimeSpan val1, TimeSpan val2)
{
if (val1 > val2)
{
return val2;
}
else
{
return val1;
}
}
public static TimeSpan Add(TimeSpan timeout1, TimeSpan timeout2)
{
return Ticks.ToTimeSpan(Ticks.Add(Ticks.FromTimeSpan(timeout1), Ticks.FromTimeSpan(timeout2)));
}
public static DateTime Add(DateTime time, TimeSpan timeout)
{
if (timeout >= TimeSpan.Zero && DateTime.MaxValue - time <= timeout)
{
return DateTime.MaxValue;
}
if (timeout <= TimeSpan.Zero && DateTime.MinValue - time >= timeout)
{
return DateTime.MinValue;
}
return time + timeout;
}
public static DateTime Subtract(DateTime time, TimeSpan timeout)
{
return Add(time, TimeSpan.Zero - timeout);
}
public static TimeSpan Divide(TimeSpan timeout, int factor)
{
if (timeout == TimeSpan.MaxValue)
{
return TimeSpan.MaxValue;
}
return Ticks.ToTimeSpan((Ticks.FromTimeSpan(timeout) / factor) + 1);
}
public TimeSpan RemainingTime()
{
if (!this.deadlineSet)
{
this.SetDeadline();
return this.originalTimeout;
}
else if (this.deadline == DateTime.MaxValue)
{
return TimeSpan.MaxValue;
}
else
{
TimeSpan remaining = this.deadline - DateTime.UtcNow;
if (remaining <= TimeSpan.Zero)
{
return TimeSpan.Zero;
}
else
{
return remaining;
}
}
}
public TimeSpan ElapsedTime()
{
return this.originalTimeout - this.RemainingTime();
}
void SetDeadline()
{
Fx.Assert(!deadlineSet, "TimeoutHelper deadline set twice.");
this.deadline = DateTime.UtcNow + this.originalTimeout;
this.deadlineSet = true;
}
public static void ThrowIfNegativeArgument(TimeSpan timeout)
{
ThrowIfNegativeArgument(timeout, "timeout");
}
public static void ThrowIfNegativeArgument(TimeSpan timeout, string argumentName)
{
if (timeout < TimeSpan.Zero)
{
throw Fx.Exception.ArgumentOutOfRange(argumentName, timeout, InternalSR.TimeoutMustBeNonNegative(argumentName, timeout));
}
}
public static void ThrowIfNonPositiveArgument(TimeSpan timeout)
{
ThrowIfNonPositiveArgument(timeout, "timeout");
}
public static void ThrowIfNonPositiveArgument(TimeSpan timeout, string argumentName)
{
if (timeout <= TimeSpan.Zero)
{
throw Fx.Exception.ArgumentOutOfRange(argumentName, timeout, InternalSR.TimeoutMustBePositive(argumentName, timeout));
}
}
[Fx.Tag.Blocking]
public static bool WaitOne(WaitHandle waitHandle, TimeSpan timeout)
{
ThrowIfNegativeArgument(timeout);
if (timeout == TimeSpan.MaxValue)
{
waitHandle.WaitOne();
return true;
}
else
{
return waitHandle.WaitOne(timeout, false);
}
}
}
}
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