TimeoutHelper.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / System.Runtime.DurableInstancing / System / Runtime / TimeoutHelper.cs / 1305376 / TimeoutHelper.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 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, SRCore.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, SRCore.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);
            } 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------ 
// 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, SRCore.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, SRCore.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);
            } 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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