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             AbstractTaskT.cs
        
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      using System;

      using System.Threading;

      namespace Implab {

          public abstract class AbstractTask<T> : AbstractPromise<T> {

              int m_cancelationLock;

              /// <summary>

              /// Получает эксклюзивное право отмены задания, используется для отмены задания до начала его выполнения.

              /// </summary>

              /// <returns><c>true</c>, if cancelation was locked, <c>false</c> otherwise.</returns>

              protected bool LockCancelation() {

                  return 0 == Interlocked.CompareExchange(ref m_cancelationLock, 1, 0);

              }

              protected void SetErrorInternal(Exception error) {

                  // unwrap 

                  while (error is PromiseTransientException && error.InnerException != null)

                      error = error.InnerException;

                  if (error is OperationCanceledException)

                      SetCancelled(error);

                  else

                      SetError(error);

              }

              protected void SetCancelledInternal(Exception reason) {

                  SetCancelled(

                      reason == null ? new OperationCanceledException() : reason is OperationCanceledException ? reason : new OperationCanceledException(null, reason)

                  );

              }

          }

      }

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				using System;
				using System.Threading;

				namespace Implab {
				public abstract class AbstractTask<T> : AbstractPromise<T> {
				int m_cancelationLock;

				/// <summary>
				/// Получает эксклюзивное право отмены задания, используется для отмены задания до начала его выполнения.
				/// </summary>
				/// <returns><c>true</c>, if cancelation was locked, <c>false</c> otherwise.</returns>
				protected bool LockCancelation() {
				return 0 == Interlocked.CompareExchange(ref m_cancelationLock, 1, 0);
				}



				protected void SetErrorInternal(Exception error) {
				// unwrap
				while (error is PromiseTransientException && error.InnerException != null)
				error = error.InnerException;

				if (error is OperationCanceledException)
				SetCancelled(error);
				else
				SetError(error);
				}

				protected void SetCancelledInternal(Exception reason) {
				SetCancelled(
				reason == null ? new OperationCanceledException() : reason is OperationCanceledException ? reason : new OperationCanceledException(null, reason)
				);
				}
				}
				}