removed the reference to the parent from the promise object this allows resolved promises to release parents and results they are holding. Added complete set of operations to IPromiseBase interface Subscribing to the cancellation event of the promise should not affect it's IsExclusive property More tests.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Implab
{
    public enum PromiseState
    {
        Unresolved,
        Resolved,
        Cancelled,
        Rejected
    }
}