TaskFactory.cs :  » 2.6.4-mono-.net-core » System.Threading » System » Threading » Tasks » C# / CSharp Open Source

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C# / CSharp Open Source » 2.6.4 mono .net core » System.Threading 
System.Threading » System » Threading » Tasks » TaskFactory.cs
#if NET_4_0 || BOOTSTRAP_NET_4_0
// 
// TaskFactory.cs
//  
// Author:
//       Jrmie "Garuma" Laval <jeremie.laval@gmail.com>
// 
// Copyright (c) 2009 Jrmie "Garuma" Laval
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

using System;
using System.Threading;

namespace System.Threading.Tasks{
  
  public class TaskFactory
  {
    TaskScheduler scheduler;
    TaskCreationOptions options;
    TaskContinuationOptions contOptions;
    CancellationToken token;
    
    #region ctors
    public TaskFactory ()
      : this (CancellationToken.None, TaskCreationOptions.None, TaskContinuationOptions.None, TaskScheduler.Current)
    {
    }

    public TaskFactory (CancellationToken token)
      : this (token, TaskCreationOptions.None, TaskContinuationOptions.None, TaskScheduler.Current)
    {  
    }

    public TaskFactory (TaskScheduler scheduler)
      : this (CancellationToken.None, TaskCreationOptions.None, TaskContinuationOptions.None, scheduler)
    {  
    }
    
    public TaskFactory (TaskCreationOptions options, TaskContinuationOptions contOptions)
      : this (CancellationToken.None, options, contOptions, TaskScheduler.Current)
    {  
    }
    
    public TaskFactory (CancellationToken token, TaskCreationOptions options, TaskContinuationOptions contOptions,
                        TaskScheduler scheduler)
    {
      this.token = token;
      this.scheduler = scheduler;
      this.options = options;
      this.contOptions = contOptions;
    }
    #endregion
    
    #region StartNew for Task
    public Task StartNew (Action action)
    {
      return StartNew (action, token, options, scheduler);
    }
    
    public Task StartNew (Action action, CancellationToken token)
    {
      return StartNew (action, token, options, scheduler);
    }
    
    public Task StartNew (Action action, TaskCreationOptions options)
    {
      return StartNew (action, token, options, scheduler);
    }
    
    public Task StartNew (Action<object> action, object state)
    {
      return StartNew (action, state, token, options, scheduler);
    }
    
    public Task StartNew (Action<object> action, object state, CancellationToken token)
    {
      return StartNew (action, state, token, options, scheduler);
    }
    
    public Task StartNew (Action<object> action, object state, TaskCreationOptions options)
    {
      return StartNew (action, state, token, options, scheduler);
    }
    
    public Task StartNew (Action action, CancellationToken token, TaskCreationOptions options, TaskScheduler scheduler)
    {
      return StartNew ((o) => action (), null, token, options, scheduler);
    }
    
    public Task StartNew (Action<object> action, object state, CancellationToken token, TaskCreationOptions options,
                          TaskScheduler scheduler)
    {
      Task t = new Task (action, state, options);
      t.Start (scheduler);
      
      return t;
    }
    #endregion
    
    #region StartNew for Task<TResult>  
    public Task<TResult> StartNew<TResult> (Func<TResult> function)
    {
      return StartNew<TResult> (function, token, options, scheduler);
    }
    
    public Task<TResult> StartNew<TResult> (Func<TResult> function, TaskCreationOptions options)
    {
      return StartNew<TResult> (function, token, options, scheduler);

    }
    
    public Task<TResult> StartNew<TResult> (Func<TResult> function, CancellationToken token)
    {
      return StartNew<TResult> (function, token, options, scheduler);
    }
    
    public Task<TResult> StartNew<TResult> (Func<TResult> function,
                                            CancellationToken token,
                                            TaskCreationOptions options,
                                            TaskScheduler scheduler)
    {
      return StartNew<TResult> ((o) => function (), null, token, options, scheduler);
    }
    
    public Task<TResult> StartNew<TResult> (Func<object, TResult> function, object state)
    {
      return StartNew<TResult> (function, state, token, options, scheduler);
    }
    
    public Task<TResult> StartNew<TResult> (Func<object, TResult> function, object state, CancellationToken token)
    {
      return StartNew<TResult> (function, state, token, options, scheduler);
    }
    
    public Task<TResult> StartNew<TResult> (Func<object, TResult> function, object state, TaskCreationOptions options)
    {
      return StartNew<TResult> (function, state, token, options, scheduler);
    }
    
    public Task<TResult> StartNew<TResult> (Func<object, TResult> function, object state,
                                            CancellationToken token,
                                            TaskCreationOptions options,
                                            TaskScheduler scheduler)
    {
      Task<TResult> t = new Task<TResult> (function, state, token, options);
      t.Start (scheduler);
      
      return t;
    }
    #endregion
    
    #region Continue
    
    public Task ContinueWhenAny (Task[] tasks, Action<Task> continuationAction)
    {
      return ContinueWhenAny (tasks, continuationAction, token, contOptions, scheduler);
    }
    
    public Task ContinueWhenAny (Task[] tasks, Action<Task> continuationAction, CancellationToken token)
    {
      return ContinueWhenAny (tasks, continuationAction, token, contOptions, scheduler);
    }
    
    public Task ContinueWhenAny (Task[] tasks, Action<Task> continuationAction, TaskContinuationOptions continuationOptions)
    {
      return ContinueWhenAny (tasks, continuationAction, token, continuationOptions, scheduler);
    }

    public Task ContinueWhenAny (Task[] tasks, Action<Task> continuationAction, CancellationToken token, 
                                 TaskContinuationOptions continuationOptions, TaskScheduler scheduler)
    {
      AtomicBoolean trigger = new AtomicBoolean ();
      Task commonContinuation = new Task (null);
      
      foreach (Task t in tasks) {
        Task cont = new Task ((o) => { continuationAction ((Task)o); }, t, token, options);
        t.ContinueWithCore (cont, continuationOptions, scheduler, trigger.TrySet);
        cont.ContinueWithCore (commonContinuation, TaskContinuationOptions.None, scheduler);
      }
      
      return commonContinuation;
    }
    
    public Task ContinueWhenAny<TAntecedentResult> (Task<TAntecedentResult>[] tasks, Action<Task<TAntecedentResult>> continuationAction)
    {
      return ContinueWhenAny (tasks, continuationAction, token, contOptions, scheduler);
    }
    
    public Task ContinueWhenAny<TAntecedentResult> (Task<TAntecedentResult>[] tasks, Action<Task<TAntecedentResult>> continuationAction,
                                                    CancellationToken token)
    {
      return ContinueWhenAny (tasks, continuationAction, token, contOptions, scheduler);
    }
    
    public Task ContinueWhenAny<TAntecedentResult> (Task<TAntecedentResult>[] tasks, Action<Task<TAntecedentResult>> continuationAction,
                                                    TaskContinuationOptions continuationOptions)
    {
      return ContinueWhenAny (tasks, continuationAction, token, continuationOptions, scheduler);
    }

    public Task ContinueWhenAny<TAntecedentResult> (Task<TAntecedentResult>[] tasks, Action<Task<TAntecedentResult>> continuationAction,
                                                    CancellationToken token, TaskContinuationOptions continuationOptions,
                                                    TaskScheduler scheduler)
    {
      return ContinueWhenAny ((Task[]) tasks, (o) => continuationAction ((Task<TAntecedentResult>)o),
                              token, continuationOptions, scheduler);
    }
    
    [MonoTODO]
    public Task<TResult> ContinueWhenAny<TResult> (Task[] tasks, Func<Task, TResult> continuationAction)
    {
      return ContinueWhenAny (tasks, continuationAction, token, contOptions, scheduler);
    }
    
    [MonoTODO]
    public Task<TResult> ContinueWhenAny<TResult> (Task[] tasks, Func<Task, TResult> continuationAction,
                                                   CancellationToken token)
    {
      return ContinueWhenAny (tasks, continuationAction, token, contOptions, scheduler);
    }
    
    [MonoTODO]
    public Task<TResult> ContinueWhenAny<TResult> (Task[] tasks, Func<Task, TResult> continuationAction,
                                                   TaskContinuationOptions continuationOptions)
    {
      return ContinueWhenAny (tasks, continuationAction, token, continuationOptions, scheduler);
    }

    [MonoTODO]
    public Task<TResult> ContinueWhenAny<TResult> (Task[] tasks, Func<Task, TResult> continuationAction,
                                                   CancellationToken token,
                                                   TaskContinuationOptions continuationOptions,
                                                   TaskScheduler scheduler)
    {
      throw new NotImplementedException ();
    }
    
    [MonoTODO]
    public Task<TResult> ContinueWhenAny<TAntecedentResult, TResult> (Task<TAntecedentResult>[] tasks,
                                                                      Func<Task<TAntecedentResult>, TResult> continuationAction)
    {
      return ContinueWhenAny (tasks, continuationAction, token, contOptions, scheduler);
    }

    [MonoTODO]
    public Task<TResult> ContinueWhenAny<TAntecedentResult, TResult> (Task<TAntecedentResult>[] tasks,
                                                                      Func<Task<TAntecedentResult>, TResult> continuationAction,
                                                                      CancellationToken token)
    {
      return ContinueWhenAny (tasks, continuationAction, token, contOptions, scheduler);
    }
    
    [MonoTODO]
    public Task<TResult> ContinueWhenAny<TAntecedentResult, TResult> (Task<TAntecedentResult>[] tasks,
                                                                      Func<Task<TAntecedentResult>, TResult> continuationAction,
                                                                      TaskContinuationOptions continuationOptions)
    {
      return ContinueWhenAny (tasks, continuationAction, token, continuationOptions, scheduler);
    }

    [MonoTODO]
    public Task<TResult> ContinueWhenAny<TAntecedentResult, TResult> (Task<TAntecedentResult>[] tasks,
                                                                      Func<Task<TAntecedentResult>, TResult> continuationAction,
                                                                      CancellationToken token,
                                                                      TaskContinuationOptions continuationOptions,
                                                                      TaskScheduler scheduler)
    {
      return ContinueWhenAny<TResult> ((Task[])tasks, (t) => continuationAction((Task<TAntecedentResult>)t), token, continuationOptions, scheduler);
    }
    
    public Task ContinueWhenAll (Task[] tasks, Action<Task[]> continuationFunction)
    {
      return ContinueWhenAll (tasks, continuationFunction, token, contOptions, scheduler);
    }
    
    public Task ContinueWhenAll (Task[] tasks, Action<Task[]> continuationFunction, CancellationToken token)
    {
      return ContinueWhenAll (tasks, continuationFunction, token, contOptions, scheduler);
    }
    
    public Task ContinueWhenAll (Task[] tasks, Action<Task[]> continuationFunction,
                                 TaskContinuationOptions continuationOptions)
    {
      return ContinueWhenAll (tasks, continuationFunction, token, continuationOptions, scheduler);
    }
    
    public Task ContinueWhenAll (Task[] tasks, Action<Task[]> continuationFunction, CancellationToken token,
                                 TaskContinuationOptions continuationOptions, TaskScheduler scheduler)
    {
      CountdownEvent evt = new CountdownEvent (tasks.Length);
      Task cont = new Task ((o) => continuationFunction ((Task[])o), tasks, token, options);
      
      foreach (Task t in tasks)
        t.ContinueWithCore (cont, continuationOptions, scheduler, evt.Signal);
      
      return cont;
    }
    
    public Task ContinueWhenAll<TAntecedentResult> (Task<TAntecedentResult>[] tasks,
                                                    Action<Task<TAntecedentResult>[]> continuationFunction)
    {
      return ContinueWhenAll (tasks, continuationFunction, token, contOptions, scheduler);
    }
    
    public Task ContinueWhenAll<TAntecedentResult> (Task<TAntecedentResult>[] tasks,
                                                    Action<Task<TAntecedentResult>[]> continuationFunction, CancellationToken token)
    {
      return ContinueWhenAll (tasks, continuationFunction, token, contOptions, scheduler);
    }
    
    public Task ContinueWhenAll<TAntecedentResult> (Task<TAntecedentResult>[] tasks, Action<Task<TAntecedentResult>[]> continuationFunction,
                                                    TaskContinuationOptions continuationOptions)
    {
      return ContinueWhenAll (tasks, continuationFunction, token, continuationOptions, scheduler);
    }
    
    public Task ContinueWhenAll<TAntecedentResult> (Task<TAntecedentResult>[] tasks, 
                                                    Action<Task<TAntecedentResult>[]> continuationFunction,
                                                    CancellationToken token, TaskContinuationOptions continuationOptions,
                                                    TaskScheduler scheduler)
    {
      return ContinueWhenAll ((Task[]) tasks, (o) => continuationFunction (tasks), token,
                              continuationOptions, scheduler);
    }
    
    public Task<TResult> ContinueWhenAll<TResult> (Task[] tasks, Func<Task[], TResult> continuationFunction)
    {
      return ContinueWhenAll<TResult> (tasks, continuationFunction, token, contOptions, scheduler);
    }
    
    public Task<TResult> ContinueWhenAll<TResult> (Task[] tasks, Func<Task[], TResult> continuationFunction,
                                                   TaskContinuationOptions continuationOptions)
    {
      return ContinueWhenAll<TResult> (tasks, continuationFunction, token, continuationOptions, scheduler);
    }
    
    public Task<TResult> ContinueWhenAll<TResult> (Task[] tasks, Func<Task[], TResult> continuationFunction,
                                                   CancellationToken token)
    {
      return ContinueWhenAll<TResult> (tasks, continuationFunction, token, contOptions, scheduler);
    }
    
    public Task<TResult> ContinueWhenAll<TResult> (Task[] tasks, Func<Task[], TResult> continuationFunction,
                                                   CancellationToken token,
                                                   TaskContinuationOptions continuationOptions, TaskScheduler scheduler)
    {
      CountdownEvent evt = new CountdownEvent (tasks.Length);
      Task<TResult> cont = new Task<TResult> ((o) => continuationFunction ((Task[])o), tasks, token, options);
      
      foreach (Task t in tasks)
        t.ContinueWithCore (cont, continuationOptions, scheduler, evt.Signal);
      
      return cont;
    }
    
    public Task<TResult> ContinueWhenAll<TAntecedentResult, TResult> (Task<TAntecedentResult>[] tasks,
                                                                      Func<Task<TAntecedentResult>[], TResult> continuationFunction)
    {
      return ContinueWhenAll<TAntecedentResult, TResult> (tasks, continuationFunction, token, contOptions, scheduler);
    }
    
    public Task<TResult> ContinueWhenAll<TAntecedentResult, TResult> (Task<TAntecedentResult>[] tasks, 
                                                                      Func<Task<TAntecedentResult>[], TResult> continuationFunction,
                                                                      TaskContinuationOptions continuationOptions)
    {
      return ContinueWhenAll<TAntecedentResult, TResult> (tasks, continuationFunction, token, continuationOptions, scheduler);
    }
    
    public Task<TResult> ContinueWhenAll<TAntecedentResult, TResult> (Task<TAntecedentResult>[] tasks,
                                                                      Func<Task<TAntecedentResult>[], TResult> continuationFunction,
                                                                      CancellationToken token)
    {
      return ContinueWhenAll<TAntecedentResult, TResult> (tasks, continuationFunction, token, contOptions, scheduler);
    }
    
    public Task<TResult> ContinueWhenAll<TAntecedentResult, TResult> (Task<TAntecedentResult>[] tasks, 
                                                                      Func<Task<TAntecedentResult>[], TResult> continuationFunction,
                                                                      CancellationToken token,
                                                                      TaskContinuationOptions continuationOptions,
                                                                      TaskScheduler scheduler)
    {
      return ContinueWhenAll<TResult> ((Task[]) tasks,
                                       (o) => continuationFunction (tasks),
                                       token,
                                       continuationOptions, scheduler);
    }

    #endregion
    
    #region FromAsync
    // For these methods to work we first have to convert the ThreadPool to use Tasks as it
    // is doing in 4.0, then all that is remaining is to identify the Task on which is 
    // run the async operation (probably with some additional state in a IAsyncResult subclass)
    // and call its ContinueWith method accordingly
    
    const string errorMsg = "Mono's thread pool doesn't support this operation yet";
    
    [MonoLimitation(errorMsg)]
    public Task FromAsync (IAsyncResult asyncResult, Action<IAsyncResult> endMethod)
    {
      return FromAsync (asyncResult, endMethod, options);
    }
    
    [MonoLimitation(errorMsg)]
    public Task FromAsync (IAsyncResult asyncResult, Action<IAsyncResult> endMethod,
                           TaskCreationOptions creationOptions)
    {
      return FromAsync (asyncResult, endMethod, creationOptions);
    }
    
    [MonoLimitation(errorMsg)]
    public Task FromAsync (IAsyncResult asyncResult, Action<IAsyncResult> endMethod,
                           TaskCreationOptions creationOptions, TaskScheduler scheduler)
    {
      throw new NotSupportedException (errorMsg);
    }
    
    [MonoLimitation(errorMsg)]
    public Task<TResult> FromAsync<TResult> (IAsyncResult asyncResult, Func<IAsyncResult, TResult> endMethod)
    {
      return FromAsync<TResult> (asyncResult, endMethod, options);
    }
    
    [MonoLimitation(errorMsg)]
    public Task<TResult> FromAsync<TResult> (IAsyncResult asyncResult, Func<IAsyncResult, TResult> endMethod,
                                             TaskCreationOptions creationOptions)
    {
      return FromAsync<TResult> (asyncResult, endMethod, creationOptions);
    }
    
    [MonoLimitation(errorMsg)]
    public Task<TResult> FromAsync<TResult> (IAsyncResult asyncResult, Func<IAsyncResult, TResult> endMethod,
                                             TaskCreationOptions creationOptions, TaskScheduler scheduler)
    {
      throw new NotSupportedException (errorMsg);
    }
    
    
    [MonoLimitation(errorMsg)]
    public Task FromAsync (Func<AsyncCallback, Object, IAsyncResult> beginMethod, Action<IAsyncResult> endMethod,
                           object state)
    {
      return FromAsync<object> ((a, c, o) => beginMethod (c, o), endMethod, state, options);
    }
    
    [MonoLimitation(errorMsg)]
    public Task FromAsync (Func<AsyncCallback, Object, IAsyncResult> beginMethod, Action<IAsyncResult> endMethod,
                           object state, TaskCreationOptions creationOptions)
    {
      return FromAsync<object> ((a, c, o) => beginMethod (c, o), endMethod, state, creationOptions);
    }
    
    [MonoLimitation(errorMsg)]
    public Task FromAsync<TArg1> (Func<TArg1, AsyncCallback, Object, IAsyncResult> beginMethod, Action<IAsyncResult> endMethod,
                                  TArg1 arg1, object state)
    {
      throw new NotSupportedException (errorMsg);
    }
    
    [MonoLimitation(errorMsg)]
    public Task FromAsync<TArg1> (Func<TArg1, AsyncCallback, Object, IAsyncResult> beginMethod, Action<IAsyncResult> endMethod,
                                  TArg1 arg1, object state, TaskCreationOptions creationOptions)
    {
      throw new NotSupportedException (errorMsg);
    }
    
    [MonoLimitation(errorMsg)]
    public Task FromAsync<TArg1, TArg2> (Func<TArg1, TArg2, AsyncCallback, Object, IAsyncResult> beginMethod, Action<IAsyncResult> endMethod,
                                         TArg1 arg1, TArg2 arg2, object state)
    {
      throw new NotSupportedException (errorMsg);
    }
    
    [MonoLimitation(errorMsg)]
    public Task FromAsync<TArg1, TArg2> (Func<TArg1, TArg2, AsyncCallback, Object, IAsyncResult> beginMethod, Action<IAsyncResult> endMethod,
                                         TArg1 arg1, TArg2 arg2, object state, TaskCreationOptions creationOptions)
    {
      throw new NotSupportedException (errorMsg);
    }
    
    [MonoLimitation(errorMsg)]
    public Task FromAsync<TArg1, TArg2, TArg3> (Func<TArg1, TArg2, TArg3, AsyncCallback, Object, IAsyncResult> beginMethod, Action<IAsyncResult> endMethod,
                                                TArg1 arg1, TArg2 arg2, TArg3 arg3, object state)
    {
      throw new NotSupportedException (errorMsg);
    }
    
    [MonoLimitation(errorMsg)]
    public Task FromAsync<TArg1, TArg2, TArg3> (Func<TArg1, TArg2, TArg3, AsyncCallback, Object, IAsyncResult> beginMethod, Action<IAsyncResult> endMethod,
                                                TArg1 arg1, TArg2 arg2, TArg3 arg3, object state, TaskCreationOptions creationOptions)
    {
      throw new NotSupportedException (errorMsg);
    }    
    
    [MonoLimitation(errorMsg)]
    public Task<TResult> FromAsync<TResult> (Func<AsyncCallback, Object, IAsyncResult> beginMethod,
                                             Func<IAsyncResult, TResult> endMethod,
                                             object state)
    {
      throw new NotSupportedException (errorMsg);
    }
    
    [MonoLimitation(errorMsg)]
    public Task<TResult> FromAsync<TResult> (Func<AsyncCallback, Object, IAsyncResult> beginMethod,
                                             Func<IAsyncResult, TResult> endMethod,
                           object state, TaskCreationOptions creationOptions)
    {
      throw new NotSupportedException (errorMsg);
    }
    
    [MonoLimitation(errorMsg)]
    public Task<TResult> FromAsync<TArg1, TResult> (Func<TArg1, AsyncCallback, Object, IAsyncResult> beginMethod,
                                                    Func<IAsyncResult, TResult> endMethod,
                                                    TArg1 arg1, object state)
    {
      throw new NotSupportedException (errorMsg);
    }
    
    [MonoLimitation(errorMsg)]
    public Task<TResult> FromAsync<TArg1, TResult> (Func<TArg1, AsyncCallback, Object, IAsyncResult> beginMethod,
                                                 Func<IAsyncResult, TResult> endMethod,
                                                 TArg1 arg1, object state, TaskCreationOptions creationOptions)
    {
      throw new NotSupportedException (errorMsg);
    }
    
    [MonoLimitation(errorMsg)]
    public Task<TResult> FromAsync<TArg1, TArg2, TResult> (Func<TArg1, TArg2, AsyncCallback, Object, IAsyncResult> beginMethod,
                                                           Func<IAsyncResult, TResult> endMethod,
                                                           TArg1 arg1, TArg2 arg2, object state)
    {
      throw new NotSupportedException (errorMsg);
    }
    
    [MonoLimitation(errorMsg)]
    public Task<TResult> FromAsync<TArg1, TArg2, TResult> (Func<TArg1, TArg2, AsyncCallback, Object, IAsyncResult> beginMethod,
                                                           Func<IAsyncResult, TResult> endMethod,
                                                           TArg1 arg1, TArg2 arg2, object state, TaskCreationOptions creationOptions)
    {
      throw new NotSupportedException (errorMsg);
    }
    
    [MonoLimitation(errorMsg)]
    public Task<TResult> FromAsync<TArg1, TArg2, TArg3, TResult> (Func<TArg1, TArg2, TArg3, AsyncCallback, Object, IAsyncResult> beginMethod,
                                                                  Func<IAsyncResult, TResult> endMethod,
                                                                  TArg1 arg1, TArg2 arg2, TArg3 arg3, object state)
    {
      throw new NotSupportedException (errorMsg);
    }
    
    [MonoLimitation(errorMsg)]
    public Task<TResult> FromAsync<TArg1, TArg2, TArg3, TResult> (Func<TArg1, TArg2, TArg3, AsyncCallback, Object, IAsyncResult> beginMethod,
                                                                  Func<IAsyncResult, TResult> endMethod,
                                                                  TArg1 arg1, TArg2 arg2, TArg3 arg3, object state,
                                                                  TaskCreationOptions creationOptions)
    {
      throw new NotSupportedException (errorMsg);
    }
    #endregion
    
    public TaskScheduler Scheduler {
      get {
        return scheduler;
      }
    }
    
    public TaskContinuationOptions ContinuationOptions {
      get {
        return contOptions;
      }
    }
    
    public TaskCreationOptions CreationOptions {
      get {
        return options;
      }
    }
    
    public CancellationToken CancellationToken {
      get {
        return token;
      }
    }
  }
  
  public class TaskFactory<TResult>
  {
    TaskScheduler scheduler;
    TaskCreationOptions options;
    TaskContinuationOptions contOptions;
    CancellationToken token;
    
    TaskFactory parent;
    
    #region ctors
    public TaskFactory ()
      : this (CancellationToken.None, TaskCreationOptions.None, TaskContinuationOptions.None, TaskScheduler.Current)
    {  
    }
    
    public TaskFactory (TaskScheduler scheduler)
      : this (CancellationToken.None, TaskCreationOptions.None, TaskContinuationOptions.None, scheduler)
    {  
    }
    
    public TaskFactory (CancellationToken token)
      : this (token, TaskCreationOptions.None, TaskContinuationOptions.None, TaskScheduler.Current)
    {  
    }
    
    public TaskFactory (TaskCreationOptions options, TaskContinuationOptions contOptions)
      : this (CancellationToken.None, options, contOptions, TaskScheduler.Current)
    {  
    }
    
    public TaskFactory (CancellationToken token, TaskCreationOptions options, TaskContinuationOptions contOptions,
                        TaskScheduler scheduler)
    {
      this.token = token;
      this.scheduler = scheduler;
      this.options = options;
      this.contOptions = contOptions;
      
      this.parent = new TaskFactory (token, options, contOptions, scheduler);
    }
    
    #endregion
    
    #region StartNew for Task<TResult>  
    public Task<TResult> StartNew (Func<TResult> function)
    {
      return StartNew (function, token, options, scheduler);
    }
    
    public Task<TResult> StartNew (Func<TResult> function, TaskCreationOptions options)
    {
      return StartNew (function, token, options, scheduler);
    }
    
    public Task<TResult> StartNew (Func<TResult> function, CancellationToken token)
    {
      return StartNew (function, token, options, scheduler);
    }
    
    public Task<TResult> StartNew (Func<TResult> function, 
                                   CancellationToken token,
                                   TaskCreationOptions options,
                                   TaskScheduler scheduler)
    {
      return StartNew ((o) => function (), null, token, options, scheduler);
    }
    
    public Task<TResult> StartNew (Func<object, TResult> function, object state)
    {
      return StartNew (function, state, token, options, scheduler);
    }
    
    public Task<TResult> StartNew (Func<object, TResult> function, object state, TaskCreationOptions options)
    {
      return StartNew (function, state, token, options, scheduler);
    }
    
    public Task<TResult> StartNew (Func<object, TResult> function, object state, CancellationToken token)
    {
      return StartNew (function, state, token, options, scheduler);
    }
    
    public Task<TResult> StartNew (Func<object, TResult> function, object state, 
                                   CancellationToken token,
                                   TaskCreationOptions options,
                                   TaskScheduler scheduler)
    {
      return parent.StartNew<TResult> (function, state, token, options, scheduler);
    }
    #endregion
    
    #region Continue
    
    [MonoTODO]
    public Task<TResult> ContinueWhenAny (Task[] tasks,
                                          Func<Task, TResult> continuationAction)
    {
      return ContinueWhenAny (tasks, continuationAction, token, contOptions, scheduler);
    }
    
    [MonoTODO]
    public Task<TResult> ContinueWhenAny (Task[] tasks,
                                          Func<Task, TResult> continuationAction,
                                          CancellationToken token)
    {
      return ContinueWhenAny (tasks, continuationAction, token, contOptions, scheduler);
    }
    
    [MonoTODO]
    public Task<TResult> ContinueWhenAny (Task[] tasks,
                                          Func<Task, TResult> continuationAction,
                                          TaskContinuationOptions continuationOptions)
    {
      return ContinueWhenAny (tasks, continuationAction, token, continuationOptions, scheduler);
    }

    [MonoTODO]
    public Task<TResult> ContinueWhenAny (Task[] tasks,
                                          Func<Task, TResult> continuationAction,
                                          CancellationToken token,
                                          TaskContinuationOptions continuationOptions,
                                          TaskScheduler scheduler)
    {
      throw new NotImplementedException ();
    }
    
    [MonoTODO]
    public Task<TResult> ContinueWhenAny<TAntecedentResult> (Task<TAntecedentResult>[] tasks,
                                                             Func<Task<TAntecedentResult>, TResult> continuationAction)
    {
      return ContinueWhenAny (tasks, continuationAction, token, contOptions, scheduler);
    }
    
    [MonoTODO]
    public Task<TResult> ContinueWhenAny<TAntecedentResult> (Task<TAntecedentResult>[] tasks,
                                                             Func<Task<TAntecedentResult>, TResult> continuationAction,
                                                             CancellationToken token)
    {
      return ContinueWhenAny (tasks, continuationAction, token, contOptions, scheduler);
    }
    
    [MonoTODO]
    public Task<TResult> ContinueWhenAny<TAntecedentResult> (Task<TAntecedentResult>[] tasks,
                                                             Func<Task<TAntecedentResult>, TResult> continuationAction,
                                                             TaskContinuationOptions continuationOptions)
    {
      return ContinueWhenAny (tasks, continuationAction, token, continuationOptions, scheduler);
    }

    [MonoTODO]
    public Task<TResult> ContinueWhenAny<TAntecedentResult> (Task<TAntecedentResult>[] tasks,
                                                             Func<Task<TAntecedentResult>, TResult> continuationAction,
                                                             CancellationToken token,
                                                             TaskContinuationOptions continuationOptions,
                                                             TaskScheduler scheduler)
    {
      throw new NotImplementedException ();
    }
    
    public Task<TResult> ContinueWhenAll (Task[] tasks,
                                          Func<Task[], TResult> continuationFunction)
    {
      return ContinueWhenAll (tasks, continuationFunction, token, contOptions, scheduler);
    }
    
    public Task<TResult> ContinueWhenAll (Task[] tasks,
                                          Func<Task[], TResult> continuationFunction,
                                          TaskContinuationOptions continuationOptions)
    {
      return ContinueWhenAll (tasks, continuationFunction, token, continuationOptions, scheduler);
    }
    
    public Task<TResult> ContinueWhenAll (Task[] tasks,
                                          Func<Task[], TResult> continuationFunction,
                                          CancellationToken token)
    {
      return ContinueWhenAll (tasks, continuationFunction, token, contOptions, scheduler);
    }
    
    public Task<TResult> ContinueWhenAll (Task[] tasks,
                                          Func<Task[], TResult> continuationFunction,
                                          CancellationToken token,
                                          TaskContinuationOptions continuationOptions, TaskScheduler scheduler)
    {
      CountdownEvent evt = new CountdownEvent (tasks.Length);
      Task<TResult> cont = new Task<TResult> ((o) => continuationFunction (tasks), tasks, token, options);
      
      foreach (Task t in tasks)
        t.ContinueWithCore (cont, continuationOptions, scheduler, evt.Signal);
      
      return cont;
    }
    
    public Task<TResult> ContinueWhenAll<TAntecedentResult> (Task<TAntecedentResult>[] tasks,
                                                             Func<Task<TAntecedentResult>[], TResult> continuationFunction)
    {
      return ContinueWhenAll (tasks, continuationFunction, token, contOptions, scheduler);
    }
    
    public Task<TResult> ContinueWhenAll<TAntecedentResult> (Task<TAntecedentResult>[] tasks,
                                                             Func<Task<TAntecedentResult>[], TResult> continuationFunction,
                                                             TaskContinuationOptions continuationOptions)
    {
      return ContinueWhenAll (tasks, continuationFunction, token, continuationOptions, scheduler);
    }
    
    public Task<TResult> ContinueWhenAll<TAntecedentResult> (Task<TAntecedentResult>[] tasks,
                                                             Func<Task<TAntecedentResult>[], TResult> continuationFunction,
                                                             CancellationToken token)
    {
      return ContinueWhenAll (tasks, continuationFunction, token, contOptions, scheduler);
    }
    
    public Task<TResult> ContinueWhenAll<TAntecedentResult> (Task<TAntecedentResult>[] tasks,
                                                             Func<Task<TAntecedentResult>[], TResult> continuationFunction,
                                                             CancellationToken token,
                                                             TaskContinuationOptions continuationOptions, TaskScheduler scheduler)
    {
      CountdownEvent evt = new CountdownEvent (tasks.Length);
      Task<TResult> cont = new Task<TResult> ((o) => continuationFunction (tasks), tasks, token, options);
      
      foreach (Task t in tasks)
        t.ContinueWithCore (cont, continuationOptions, scheduler, evt.Signal);
      
      return cont;
    }

    #endregion
    
    #region FromAsync
    const string errorMsg = "Mono's thread pool doesn't support this operation yet";
    
    [MonoLimitation(errorMsg)]
    public Task<TResult> FromAsync (IAsyncResult asyncResult, Func<IAsyncResult, TResult> endMethod)
    {
      return FromAsync (asyncResult, endMethod, options);
    }
    
    [MonoLimitation(errorMsg)]
    public Task<TResult> FromAsync (IAsyncResult asyncResult, Func<IAsyncResult, TResult> endMethod,
                                    TaskCreationOptions creationOptions)
    {
      return FromAsync (asyncResult, endMethod, creationOptions);
    }
    
    [MonoLimitation(errorMsg)]
    public Task<TResult> FromAsync (IAsyncResult asyncResult, Func<IAsyncResult, TResult> endMethod,
                                    TaskCreationOptions creationOptions, TaskScheduler scheduler)
    {
      throw new NotSupportedException (errorMsg);
    }
    
    [MonoLimitation(errorMsg)]
    public Task<TResult> FromAsync (Func<AsyncCallback, Object, IAsyncResult> beginMethod,
                                    Func<IAsyncResult, TResult> endMethod,
                                    object state)
    {
      throw new NotSupportedException (errorMsg);
    }
    
    [MonoLimitation(errorMsg)]
    public Task<TResult> FromAsync (Func<AsyncCallback, Object, IAsyncResult> beginMethod,
                                    Func<IAsyncResult, TResult> endMethod,
                                    object state, TaskCreationOptions creationOptions)
    {
      throw new NotSupportedException (errorMsg);
    }
    
    [MonoLimitation(errorMsg)]
    public Task<TResult> FromAsync<TArg1> (Func<TArg1, AsyncCallback, Object, IAsyncResult> beginMethod,
                                           Func<IAsyncResult, TResult> endMethod,
                                           TArg1 arg1, object state)
    {
      throw new NotSupportedException (errorMsg);
    }
    
    [MonoLimitation(errorMsg)]
    public Task<TResult> FromAsync<TArg1> (Func<TArg1, AsyncCallback, Object, IAsyncResult> beginMethod,
                                           Func<IAsyncResult, TResult> endMethod,
                                           TArg1 arg1, object state, TaskCreationOptions creationOptions)
    {
      throw new NotSupportedException (errorMsg);
    }
    
    [MonoLimitation(errorMsg)]
    public Task<TResult> FromAsync<TArg1, TArg2> (Func<TArg1, TArg2, AsyncCallback, Object, IAsyncResult> beginMethod,
                                                  Func<IAsyncResult, TResult> endMethod,
                                                  TArg1 arg1, TArg2 arg2, object state)
    {
      throw new NotSupportedException (errorMsg);
    }
    
    [MonoLimitation(errorMsg)]
    public Task<TResult> FromAsync<TArg1, TArg2> (Func<TArg1, TArg2, AsyncCallback, Object, IAsyncResult> beginMethod,
                                                  Func<IAsyncResult, TResult> endMethod,
                                                  TArg1 arg1, TArg2 arg2, object state, TaskCreationOptions creationOptions)
    {
      throw new NotSupportedException (errorMsg);
    }
    
    [MonoLimitation(errorMsg)]
    public Task<TResult> FromAsync<TArg1, TArg2, TArg3> (Func<TArg1, TArg2, TArg3, AsyncCallback, Object, IAsyncResult> beginMethod,
                                                         Func<IAsyncResult, TResult> endMethod,
                                                         TArg1 arg1, TArg2 arg2, TArg3 arg3, object state)
    {
      throw new NotSupportedException (errorMsg);
    }
    
    [MonoLimitation(errorMsg)]
    public Task<TResult> FromAsync<TArg1, TArg2, TArg3> (Func<TArg1, TArg2, TArg3, AsyncCallback, Object, IAsyncResult> beginMethod,
                                                         Func<IAsyncResult, TResult> endMethod,
                                                         TArg1 arg1, TArg2 arg2, TArg3 arg3, object state,
                                                         TaskCreationOptions creationOptions)
    {
      throw new NotSupportedException (errorMsg);
    }
    #endregion
    
    public TaskScheduler Scheduler {
      get {
        return scheduler;
      }
    }
    
    public TaskContinuationOptions ContinuationOptions {
      get {
        return contOptions;
      }
    }
    
    public TaskCreationOptions CreationOptions {
      get {
        return options;
      }
    }
    
    public CancellationToken CancellationToken {
      get {
        return token;
      }
    }
  }
}
#endif
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