mcs/class/corlib/Test/System.Threading.Tasks/TaskTest.cs

   1 //
   2 // TaskTest.cs
   3 //
   4 // Authors:
   5 //      Marek Safar  <marek.safar@gmail.com>
   6 //
   7 // Copyright (c) 2008 Jérémie "Garuma" Laval
   8 // Copyright (C) 2011 Xamarin Inc (http://www.xamarin.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining a copy
  11 // of this software and associated documentation files (the "Software"), to deal
  12 // in the Software without restriction, including without limitation the rights
  13 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  14 // copies of the Software, and to permit persons to whom the Software is
  15 // furnished to do so, subject to the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be included in
  18 // all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  23 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  24 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  25 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  26 // THE SOFTWARE.
  27 //
  28 //
  29
  30
  31 using System;
  32 using System.Threading;
  33 using System.Threading.Tasks;
  34 using System.Collections.Generic;
  35 using NUnit.Framework;
  36
  37 #if !MOBILE
  38 using NUnit.Framework.SyntaxHelpers;
  39 #endif
  40
  41 namespace MonoTests.System.Threading.Tasks
  42 {
  43         [TestFixture]
  44         public class TaskTests
  45         {
  46                 class MockScheduler : TaskScheduler
  47                 {
  48                         public event Action<Task, bool> TryExecuteTaskInlineHandler;
  49
  50                         protected override IEnumerable<Task> GetScheduledTasks ()
  51                         {
  52                                 throw new NotImplementedException ();
  53                         }
  54
  55                         protected override void QueueTask (Task task)
  56                         {
  57                                 return;
  58                         }
  59
  60                         protected override bool TryExecuteTaskInline (Task task, bool taskWasPreviouslyQueued)
  61                         {
  62                                 if (TryExecuteTaskInlineHandler != null)
  63                                         TryExecuteTaskInlineHandler (task, taskWasPreviouslyQueued);
  64
  65                                 return base.TryExecuteTask (task);
  66                         }
  67                 }
  68
  69                 class NonInlineableScheduler : TaskScheduler
  70                 {
  71                         protected override IEnumerable<Task> GetScheduledTasks ()
  72                         {
  73                                 throw new NotImplementedException ();
  74                         }
  75
  76                         protected override void QueueTask (Task task)
  77                         {
  78                                 if (!base.TryExecuteTask (task))
  79                                         throw new ApplicationException ();
  80                         }
  81
  82                         protected override bool TryExecuteTaskInline (Task task, bool taskWasPreviouslyQueued)
  83                         {
  84                                 return false;
  85                         }
  86                 }
  87
  88                 class ExceptionScheduler : TaskScheduler
  89                 {
  90                         protected override IEnumerable<Task> GetScheduledTasks ()
  91                         {
  92                                 throw new ApplicationException ("1");
  93                         }
  94
  95                         protected override void QueueTask (Task task)
  96                         {
  97                                 throw new ApplicationException ("2");
  98                         }
  99
 100                         protected override bool TryExecuteTaskInline (Task task, bool taskWasPreviouslyQueued)
 101                         {
 102                                 throw new ApplicationException ("3");
 103                         }
 104                 }
 105
 106                 int workerThreads;
 107                 int completionPortThreads;
 108
 109                 Task[] tasks;
 110                 const int max = 6;
 111                 object cleanup_mutex = new object ();
 112                 List<Task> cleanup_list;
 113
 114                 [SetUp]
 115                 public void Setup()
 116                 {
 117                         ThreadPool.GetMinThreads (out workerThreads, out completionPortThreads);
 118                         ThreadPool.SetMinThreads (1, 1);
 119
 120                         tasks = new Task[max];
 121                         cleanup_list = new List<Task> ();
 122                 }
 123
 124                 [TearDown]
 125                 public void Teardown()
 126                 {
 127                         ThreadPool.SetMinThreads (workerThreads, completionPortThreads);
 128                         Task[] l = null;
 129                         lock (cleanup_mutex) {
 130                                 l = cleanup_list.ToArray ();
 131                         }
 132                         try {
 133                                 Task.WaitAll (l);
 134                         } catch (Exception) {
 135                         }
 136                 }
 137
 138                 void AddToCleanup (Task[] tasks) {
 139                         lock (cleanup_mutex) {
 140                                 foreach (var t in tasks)
 141                                         cleanup_list.Add (t);
 142                         }
 143                 }
 144
 145                 void AddToCleanup (Task task) {
 146                         lock (cleanup_mutex) {
 147                                 cleanup_list.Add (task);
 148                         }
 149                 }
 150
 151                 void InitWithDelegate(Action action)
 152                 {
 153                         for (int i = 0; i < max; i++) {
 154                                 tasks[i] = Task.Factory.StartNew(action);
 155                         }
 156                         AddToCleanup (tasks);
 157                 }
 158
 159                 [Test]
 160                 public void WaitAnyTest()
 161                 {
 162                         ParallelTestHelper.Repeat (delegate {
 163                                 int flag = 0;
 164                                 int finished = 0;
 165
 166                                 InitWithDelegate(delegate {
 167                                         int times = Interlocked.Exchange (ref flag, 1);
 168                                         if (times == 1) {
 169                                                 SpinWait sw = new SpinWait ();
 170                                                 while (finished == 0) sw.SpinOnce ();
 171                                         } else {
 172                                                 Interlocked.Increment (ref finished);
 173                                         }
 174                                 });
 175
 176                                 int index = Task.WaitAny(tasks, 1000);
 177
 178                                 Assert.AreNotEqual (-1, index, "#3");
 179                                 Assert.AreEqual (1, flag, "#1");
 180                                 Assert.AreEqual (1, finished, "#2");
 181                         });
 182                 }
 183
 184                 [Test]
 185                 public void WaitAny_Empty ()
 186                 {
 187                         Assert.AreEqual (-1, Task.WaitAny (new Task[0]));
 188                 }
 189
 190                 [Test]
 191                 public void WaitAny_Zero ()
 192                 {
 193                         Assert.AreEqual (-1, Task.WaitAny (new[] { new Task (delegate { })}, 0), "#1");
 194                         Assert.AreEqual (-1, Task.WaitAny (new[] { new Task (delegate { }) }, 20), "#1");
 195                 }
 196
 197                 [Test]
 198                 public void WaitAny_Cancelled ()
 199                 {
 200                         var cancelation = new CancellationTokenSource ();
 201                         var tasks = new Task[] {
 202                                 new Task (delegate { }),
 203                                 new Task (delegate { }, cancelation.Token)
 204                         };
 205
 206                         cancelation.Cancel ();
 207
 208                         Assert.AreEqual (1, Task.WaitAny (tasks, 1000), "#1");
 209                         Assert.IsTrue (tasks[1].IsCompleted, "#2");
 210                         Assert.IsTrue (tasks[1].IsCanceled, "#3");
 211                 }
 212
 213                 [Test]
 214                 public void WaitAny_CancelledWithoutExecution ()
 215                 {
 216                         var cancelation = new CancellationTokenSource ();
 217                         var tasks = new Task[] {
 218                                 new Task (delegate { }),
 219                                 new Task (delegate { })
 220                         };
 221
 222                         int res = 0;
 223                         var mre = new ManualResetEventSlim (false);
 224                         ThreadPool.QueueUserWorkItem (delegate {
 225                                 res = Task.WaitAny (tasks, 20);
 226                                 mre.Set ();
 227                         });
 228
 229                         cancelation.Cancel ();
 230                         Assert.IsTrue (mre.Wait (1000), "#1");
 231                         Assert.AreEqual (-1, res);
 232                 }
 233
 234                 [Test]
 235                 public void WaitAny_OneException ()
 236                 {
 237                         var mre = new ManualResetEventSlim (false);
 238                         var tasks = new Task[] {
 239                                 Task.Factory.StartNew (delegate { mre.Wait (5000); }),
 240                                 Task.Factory.StartNew (delegate { throw new ApplicationException (); })
 241                         };
 242
 243                         Assert.AreEqual (1, Task.WaitAny (tasks, 3000), "#1");
 244                         Assert.IsFalse (tasks[0].IsCompleted, "#2");
 245                         Assert.IsTrue (tasks[1].IsFaulted, "#3");
 246
 247                         mre.Set ();
 248                 }
 249
 250                 [Test]
 251                 public void WaitAny_SingleCanceled ()
 252                 {
 253                         var src = new CancellationTokenSource ();
 254                         var t = Task.Factory.StartNew (() => { Thread.Sleep (200); src.Cancel (); src.Token.ThrowIfCancellationRequested (); }, src.Token);
 255                         Assert.AreEqual (0, Task.WaitAny (new [] { t }));
 256                 }
 257
 258                 public void WaitAny_ManyExceptions ()
 259                 {
 260                         CountdownEvent cde = new CountdownEvent (3);
 261                         var tasks = new [] {
 262                                 Task.Factory.StartNew (delegate { try { throw new ApplicationException (); } finally { cde.Signal (); } }),
 263                                 Task.Factory.StartNew (delegate { try { throw new ApplicationException (); } finally { cde.Signal (); } }),
 264                                 Task.Factory.StartNew (delegate { try { throw new ApplicationException (); } finally { cde.Signal (); } })
 265                         };
 266
 267                         Assert.IsTrue (cde.Wait (1000), "#1");
 268
 269                         try {
 270                                 Assert.IsTrue (Task.WaitAll (tasks, 1000), "#2");
 271                         } catch (AggregateException e) {
 272                                 Assert.AreEqual (3, e.InnerExceptions.Count, "#3");
 273                         }
 274                 }
 275
 276                 [Test]
 277                 public void WaitAny_ManyCanceled ()
 278                 {
 279                         var cancellation = new CancellationToken (true);
 280                         var tasks = new[] {
 281                                 Task.Factory.StartNew (delegate { }, cancellation),
 282                                 Task.Factory.StartNew (delegate { }, cancellation),
 283                                 Task.Factory.StartNew (delegate { }, cancellation)
 284                         };
 285
 286                         try {
 287                                 Assert.IsTrue (Task.WaitAll (tasks, 1000), "#1");
 288                         } catch (AggregateException e) {
 289                                 Assert.AreEqual (3, e.InnerExceptions.Count, "#2");
 290                         }
 291                 }
 292
 293                 [Test]
 294                 public void WaitAllTest ()
 295                 {
 296                         ParallelTestHelper.Repeat (delegate {
 297                                 int achieved = 0;
 298                                 InitWithDelegate(delegate { Interlocked.Increment(ref achieved); });
 299                                 Task.WaitAll(tasks);
 300                                 Assert.AreEqual(max, achieved, "#1");
 301                         });
 302                 }
 303
 304                 [Test]
 305                 public void WaitAll_ManyTasks ()
 306                 {
 307                         for (int r = 0; r < 2000; ++r) {
 308                                 var tasks = new Task[60];
 309
 310                                 for (int i = 0; i < tasks.Length; i++) {
 311                                         tasks[i] = Task.Factory.StartNew (delegate { Thread.Sleep (0); });
 312                                 }
 313                                 AddToCleanup (tasks);
 314
 315                                 Assert.IsTrue (Task.WaitAll (tasks, 5000));
 316                         }
 317                 }
 318
 319                 [Test]
 320                 public void WaitAll_Zero ()
 321                 {
 322                         Assert.IsFalse (Task.WaitAll (new Task[1] { new Task (delegate { }) }, 0), "#0");
 323                         Assert.IsFalse (Task.WaitAll (new Task[1] { new Task (delegate { }) }, 10), "#1");
 324                 }
 325
 326                 [Test]
 327                 public void WaitAll_WithExceptions ()
 328                 {
 329                         InitWithDelegate (delegate { throw new ApplicationException (); });
 330
 331                         try {
 332                                 Task.WaitAll (tasks);
 333                                 Assert.Fail ("#1");
 334                         } catch (AggregateException e) {
 335                                 Assert.AreEqual (6, e.InnerExceptions.Count, "#2");
 336                         }
 337
 338                         Assert.IsNotNull (tasks[0].Exception, "#3");
 339                 }
 340
 341                 [Test]
 342                 public void WaitAll_TimeoutWithExceptionsAfter ()
 343                 {
 344                         CountdownEvent cde = new CountdownEvent (2);
 345                         var mre = new ManualResetEvent (false);
 346                         var tasks = new[] {
 347                                 Task.Factory.StartNew (delegate { Assert.IsTrue (mre.WaitOne (10000), "#0"); }),
 348                                 Task.Factory.StartNew (delegate { try { throw new ApplicationException (); } finally { cde.Signal (); } }),
 349                                 Task.Factory.StartNew (delegate { try { throw new ApplicationException (); } finally { cde.Signal (); } })
 350                         };
 351
 352                         Assert.IsTrue (cde.Wait (5000), "#1");
 353                         Assert.IsFalse (Task.WaitAll (tasks, 1000), "#2");
 354
 355                         mre.Set ();
 356
 357                         try {
 358                                 Task.WaitAll (tasks, 1000);
 359                                 Assert.Fail ("#4");
 360                         } catch (AggregateException e) {
 361                                 Assert.AreEqual (2, e.InnerExceptions.Count, "#5");
 362                         }
 363                 }
 364
 365                 [Test]
 366                 public void WaitAll_TimeoutWithExceptionsBefore ()
 367                 {
 368                         CountdownEvent cde = new CountdownEvent (2);
 369                         var mre = new ManualResetEvent (false);
 370                         var tasks = new[] {
 371                                 Task.Factory.StartNew (delegate { try { throw new ApplicationException (); } finally { cde.Signal (); } }),
 372                                 Task.Factory.StartNew (delegate { try { throw new ApplicationException (); } finally { cde.Signal (); } }),
 373                                 Task.Factory.StartNew (delegate { mre.WaitOne (); })
 374                         };
 375
 376                         Assert.IsTrue (cde.Wait (1000), "#1");
 377                         Assert.IsFalse (Task.WaitAll (tasks, 1000), "#2");
 378
 379                         mre.Set ();
 380
 381                         try {
 382                                 Assert.IsTrue (Task.WaitAll (tasks, 1000), "#3");
 383                                 Assert.Fail ("#4");
 384                         } catch (AggregateException e) {
 385                                 Assert.AreEqual (2, e.InnerExceptions.Count, "#5");
 386                         }
 387                 }
 388
 389                 [Test]
 390                 public void WaitAll_Cancelled ()
 391                 {
 392                         var cancelation = new CancellationTokenSource ();
 393                         var tasks = new Task[] {
 394                                 new Task (delegate { cancelation.Cancel (); }),
 395                                 new Task (delegate { }, cancelation.Token)
 396                         };
 397
 398                         tasks[0].Start ();
 399
 400                         try {
 401                                 Task.WaitAll (tasks);
 402                                 Assert.Fail ("#1");
 403                         } catch (AggregateException e) {
 404                                 var inner = (TaskCanceledException) e.InnerException;
 405                                 Assert.AreEqual (tasks[1], inner.Task, "#2");
 406                         }
 407
 408                         Assert.IsTrue (tasks[0].IsCompleted, "#3");
 409                         Assert.IsTrue (tasks[1].IsCanceled, "#4");
 410                 }
 411
 412                 [Test]
 413                 public void WaitAll_CancelledAndTimeout ()
 414                 {
 415                         var ct = new CancellationToken (true);
 416                         var t1 = new Task (() => {}, ct);
 417                         var t2 = Task.Delay (3000);
 418                         Assert.IsFalse (Task.WaitAll (new[] { t1, t2 }, 10));
 419                 }
 420
 421                 [Test]
 422                 public void WaitAllExceptionThenCancelled ()
 423                 {
 424                         var cancelation = new CancellationTokenSource ();
 425                         var tasks = new Task[] {
 426                                 new Task (delegate { cancelation.Cancel (); throw new ApplicationException (); }),
 427                                 new Task (delegate { }, cancelation.Token)
 428                         };
 429
 430                         tasks[0].Start ();
 431
 432                         try {
 433                                 Task.WaitAll (tasks);
 434                                 Assert.Fail ("#1");
 435                         } catch (AggregateException e) {
 436                                 Assert.That (e.InnerException, Is.TypeOf (typeof (ApplicationException)), "#2");
 437                                 var inner = (TaskCanceledException) e.InnerExceptions[1];
 438                                 Assert.AreEqual (tasks[1], inner.Task, "#3");
 439                         }
 440
 441                         Assert.IsTrue (tasks[0].IsCompleted, "#4");
 442                         Assert.IsTrue (tasks[1].IsCanceled, "#5");
 443                 }
 444
 445                 [Test]
 446                 public void WaitAll_StartedUnderWait ()
 447                 {
 448                         var task1 = new Task (delegate { });
 449
 450                         ThreadPool.QueueUserWorkItem (delegate {
 451                                 // Sleep little to let task to start and hit internal wait
 452                                 Thread.Sleep (20);
 453                                 task1.Start ();
 454                         });
 455
 456                         Assert.IsTrue (Task.WaitAll (new [] { task1 }, 1000), "#1");
 457                 }
 458
 459                 [Test]
 460                 public void CancelBeforeStart ()
 461                 {
 462                         var src = new CancellationTokenSource ();
 463
 464                         Task t = new Task (delegate { }, src.Token);
 465                         src.Cancel ();
 466                         Assert.AreEqual (TaskStatus.Canceled, t.Status, "#1");
 467
 468                         try {
 469                                 t.Start ();
 470                                 Assert.Fail ("#2");
 471                         } catch (InvalidOperationException) {
 472                         }
 473                 }
 474
 475                 [Test]
 476                 public void Wait_CancelledTask ()
 477                 {
 478                         var src = new CancellationTokenSource ();
 479
 480                         Task t = new Task (delegate { }, src.Token);
 481                         src.Cancel ();
 482
 483                         try {
 484                                 t.Wait (1000);
 485                                 Assert.Fail ("#1");
 486                         } catch (AggregateException e) {
 487                                 var details = (TaskCanceledException) e.InnerException;
 488                                 Assert.AreEqual (t, details.Task, "#1e");
 489                         }
 490
 491                         try {
 492                                 t.Wait ();
 493                                 Assert.Fail ("#2");
 494                         } catch (AggregateException e) {
 495                                 var details = (TaskCanceledException) e.InnerException;
 496                                 Assert.AreEqual (t, details.Task, "#2e");
 497                                 Assert.IsNull (details.Task.Exception, "#2e2");
 498                         }
 499                 }
 500
 501                 [Test]
 502                 public void Wait_Inlined ()
 503                 {
 504                         bool? previouslyQueued = null;
 505
 506                         var scheduler = new MockScheduler ();
 507                         scheduler.TryExecuteTaskInlineHandler += (task, b) => {
 508                                 previouslyQueued = b;
 509                         };
 510
 511                         var tf = new TaskFactory (scheduler);
 512                         var t = tf.StartNew (() => { });
 513                         t.Wait ();
 514
 515                         Assert.AreEqual (true, previouslyQueued);
 516                 }
 517
 518                 [Test]
 519                 public void CreationWhileInitiallyCanceled ()
 520                 {
 521                         var token = new CancellationToken (true);
 522                         var task = new Task (() => { }, token);
 523
 524                         try {
 525                                 task.Start ();
 526                                 Assert.Fail ("#1");
 527                         } catch (InvalidOperationException) {
 528                         }
 529
 530                         try {
 531                                 task.Wait ();
 532                                 Assert.Fail ("#2");
 533                         } catch (AggregateException e) {
 534                                 Assert.That (e.InnerException, Is.TypeOf (typeof (TaskCanceledException)), "#3");
 535                         }
 536
 537                         Assert.IsTrue (task.IsCanceled, "#4");
 538                 }
 539
 540                 [Test]
 541                 public void ContinueWithInvalidArguments ()
 542                 {
 543                         var task = new Task (() => { });
 544                         try {
 545                                 task.ContinueWith (null);
 546                                 Assert.Fail ("#1");
 547                         } catch (ArgumentNullException e) {
 548                         }
 549
 550                         try {
 551                                 task.ContinueWith (delegate { }, null);
 552                                 Assert.Fail ("#2");
 553                         } catch (ArgumentNullException e) {
 554                         }
 555
 556                         try {
 557                                 task.ContinueWith (delegate { }, TaskContinuationOptions.OnlyOnCanceled | TaskContinuationOptions.NotOnCanceled);
 558                                 Assert.Fail ("#3");
 559                         } catch (ArgumentOutOfRangeException) {
 560                         }
 561
 562                         try {
 563                                 task.ContinueWith (delegate { }, TaskContinuationOptions.OnlyOnRanToCompletion | TaskContinuationOptions.NotOnRanToCompletion);
 564                                 Assert.Fail ("#4");
 565                         } catch (ArgumentOutOfRangeException) {
 566                         }
 567                 }
 568
 569                 [Test]
 570                 public void ContinueWithOnAnyTestCase()
 571                 {
 572                         ParallelTestHelper.Repeat (delegate {
 573                                 bool result = false;
 574
 575                                 Task t = Task.Factory.StartNew(delegate { });
 576                                 Task cont = t.ContinueWith(delegate { result = true; }, TaskContinuationOptions.None);
 577                                 Assert.IsTrue (t.Wait (2000), "First wait, (status, {0})", t.Status);
 578                                 Assert.IsTrue (cont.Wait(2000), "Cont wait, (result, {0}) (parent status, {2}) (status, {1})", result, cont.Status, t.Status);
 579                                 Assert.IsNull(cont.Exception, "#1");
 580                                 Assert.IsNotNull(cont, "#2");
 581                                 Assert.IsTrue(result, "#3");
 582                         });
 583                 }
 584
 585                 [Test]
 586                 public void ContinueWithOnCompletedSuccessfullyTestCase()
 587                 {
 588                         ParallelTestHelper.Repeat (delegate {
 589                                 bool result = false;
 590
 591                                 Task t = Task.Factory.StartNew(delegate { });
 592                                 Task cont = t.ContinueWith(delegate { result = true; }, TaskContinuationOptions.OnlyOnRanToCompletion);
 593                                 Assert.IsTrue (t.Wait(1000), "#4");
 594                                 Assert.IsTrue (cont.Wait(1000), "#5");
 595
 596                                 Assert.IsNull(cont.Exception, "#1");
 597                                 Assert.IsNotNull(cont, "#2");
 598                                 Assert.IsTrue(result, "#3");
 599                         });
 600                 }
 601
 602                 [Test]
 603                 public void ContinueWithOnAbortedTestCase()
 604                 {
 605                         bool result = false;
 606                         bool taskResult = false;
 607
 608                         CancellationTokenSource src = new CancellationTokenSource ();
 609                         Task t = new Task (delegate { taskResult = true; }, src.Token);
 610
 611                         Task cont = t.ContinueWith (delegate { result = true; },
 612                                 TaskContinuationOptions.OnlyOnCanceled | TaskContinuationOptions.ExecuteSynchronously);
 613
 614                         src.Cancel ();
 615
 616                         Assert.AreEqual (TaskStatus.Canceled, t.Status, "#1a");
 617                         Assert.IsTrue (cont.IsCompleted, "#1b");
 618                         Assert.IsTrue (result, "#1c");
 619
 620                         try {
 621                                 t.Start ();
 622                                 Assert.Fail ("#2");
 623                         } catch (InvalidOperationException) {
 624                         }
 625
 626                         Assert.IsTrue (cont.Wait (1000), "#3");
 627
 628                         Assert.IsFalse (taskResult, "#4");
 629
 630                         Assert.IsNull (cont.Exception, "#5");
 631                         Assert.AreEqual (TaskStatus.RanToCompletion, cont.Status, "#6");
 632                 }
 633
 634                 [Test]
 635                 public void ContinueWithOnFailedTestCase()
 636                 {
 637                         ParallelTestHelper.Repeat (delegate {
 638                                 bool result = false;
 639
 640                                 Task t = Task.Factory.StartNew(delegate { throw new Exception("foo"); });
 641                                 Task cont = t.ContinueWith(delegate { result = true; }, TaskContinuationOptions.OnlyOnFaulted);
 642
 643                                 Assert.IsTrue (cont.Wait(1000), "#0");
 644                                 Assert.IsNotNull (t.Exception, "#1");
 645                                 Assert.IsNotNull (cont, "#2");
 646                                 Assert.IsTrue (result, "#3");
 647                         });
 648                 }
 649
 650                 [Test]
 651                 public void ContinueWithWithStart ()
 652                 {
 653                         Task t = new Task<int> (() => 1);
 654                         t = t.ContinueWith (l => { });
 655                         try {
 656                                 t.Start ();
 657                                 Assert.Fail ();
 658                         } catch (InvalidOperationException) {
 659                         }
 660                 }
 661
 662                 [Test]
 663                 public void ContinueWithChildren ()
 664                 {
 665                         ParallelTestHelper.Repeat (delegate {
 666                                 bool result = false;
 667
 668                                 var t = Task.Factory.StartNew (() => Task.Factory.StartNew (() => {}, TaskCreationOptions.AttachedToParent));
 669
 670                                 var mre = new ManualResetEvent (false);
 671                                 t.ContinueWith (l => {
 672                                         result = true;
 673                                         mre.Set ();
 674                                 });
 675
 676                                 Assert.IsTrue (mre.WaitOne (1000), "#1");
 677                                 Assert.IsTrue (result, "#2");
 678                         }, 2);
 679                 }
 680
 681                 [Test]
 682                 public void ContinueWithDifferentOptionsAreCanceledTest ()
 683                 {
 684                         var mre = new ManualResetEventSlim ();
 685                         var task = Task.Factory.StartNew (() => mre.Wait (200));
 686                         var contFailed = task.ContinueWith (t => {}, TaskContinuationOptions.OnlyOnFaulted);
 687                         var contCanceled = task.ContinueWith (t => {}, TaskContinuationOptions.OnlyOnCanceled);
 688                         var contSuccess = task.ContinueWith (t => {}, TaskContinuationOptions.OnlyOnRanToCompletion);
 689
 690                         mre.Set ();
 691                         contSuccess.Wait (100);
 692
 693                         Assert.IsTrue (contSuccess.IsCompleted);
 694                         Assert.IsTrue (contFailed.IsCompleted);
 695                         Assert.IsTrue (contCanceled.IsCompleted);
 696                         Assert.IsFalse (contSuccess.IsCanceled);
 697                         Assert.IsTrue (contFailed.IsCanceled);
 698                         Assert.IsTrue (contCanceled.IsCanceled);
 699                 }
 700
 701                 [Test]
 702                 public void MultipleTasks()
 703                 {
 704                         ParallelTestHelper.Repeat (delegate {
 705                                 bool r1 = false, r2 = false, r3 = false;
 706
 707                                 Task t1 = Task.Factory.StartNew(delegate {
 708                                         r1 = true;
 709                                 });
 710                                 Task t2 = Task.Factory.StartNew(delegate {
 711                                         r2 = true;
 712                                 });
 713                                 Task t3 = Task.Factory.StartNew(delegate {
 714                                         r3 = true;
 715                                 });
 716
 717                                 t1.Wait(2000);
 718                                 t2.Wait(2000);
 719                                 t3.Wait(2000);
 720
 721                                 Assert.IsTrue(r1, "#1");
 722                                 Assert.IsTrue(r2, "#2");
 723                                 Assert.IsTrue(r3, "#3");
 724                         }, 100);
 725                 }
 726
 727                 [Test]
 728                 public void WaitChildTestCase()
 729                 {
 730                         ParallelTestHelper.Repeat (delegate {
 731                                 bool r1 = false, r2 = false, r3 = false;
 732                                 var mre = new ManualResetEventSlim (false);
 733                                 var mreStart = new ManualResetEventSlim (false);
 734
 735                                 Task t = Task.Factory.StartNew(delegate {
 736                                         Task.Factory.StartNew(delegate {
 737                                                 mre.Wait (300);
 738                                                 r1 = true;
 739                                         }, TaskCreationOptions.AttachedToParent);
 740                                         Task.Factory.StartNew(delegate {
 741                                                 r2 = true;
 742                                         }, TaskCreationOptions.AttachedToParent);
 743                                         Task.Factory.StartNew(delegate {
 744                                                 r3 = true;
 745                                         }, TaskCreationOptions.AttachedToParent);
 746                                         mreStart.Set ();
 747                                 });
 748
 749                                 mreStart.Wait (300);
 750                                 Assert.IsFalse (t.Wait (10), "#0a");
 751                                 mre.Set ();
 752                                 Assert.IsTrue (t.Wait (500), "#0b");
 753                                 Assert.IsTrue(r2, "#1");
 754                                 Assert.IsTrue(r3, "#2");
 755                                 Assert.IsTrue(r1, "#3");
 756                                 Assert.AreEqual (TaskStatus.RanToCompletion, t.Status, "#4");
 757                         }, 10);
 758                 }
 759
 760                 Task parent_wfc;
 761
 762                 [Test]
 763                 public void WaitingForChildrenToComplete ()
 764                 {
 765                         Task nested = null;
 766                         var mre = new ManualResetEvent (false);
 767
 768                         parent_wfc = Task.Factory.StartNew (() => {
 769                                 nested = Task.Factory.StartNew (() => {
 770                                         Assert.IsTrue (mre.WaitOne (4000), "parent_wfc needs to be set first");
 771                                         Assert.IsFalse (parent_wfc.Wait (10), "#1a");
 772                                         Assert.AreEqual (TaskStatus.WaitingForChildrenToComplete, parent_wfc.Status, "#1b");
 773                                 }, TaskCreationOptions.AttachedToParent).ContinueWith (l => {
 774                                         Assert.IsTrue (parent_wfc.Wait (2000), "#2a");
 775                                         Assert.AreEqual (TaskStatus.RanToCompletion, parent_wfc.Status, "#2b");
 776                                 }, TaskContinuationOptions.ExecuteSynchronously);
 777                         });
 778
 779                         mre.Set ();
 780                         Assert.IsTrue (parent_wfc.Wait (2000), "#3");
 781                         Assert.IsTrue (nested.Wait (2000), "#4");
 782                 }
 783
 784                 [Test]
 785                 public void WaitChildWithContinuationAttachedTest ()
 786                 {
 787                         bool result = false;
 788                         var task = new Task(() =>
 789                         {
 790                                 Task.Factory.StartNew(() =>     {
 791                                         Thread.Sleep (200);
 792                                 }, TaskCreationOptions.AttachedToParent).ContinueWith(t => {
 793                                         Thread.Sleep (200);
 794                                         result = true;
 795                                 }, TaskContinuationOptions.AttachedToParent);
 796                         });
 797                         task.Start();
 798                         task.Wait();
 799                         Assert.IsTrue (result);
 800                 }
 801
 802                 [Test]
 803                 public void WaitChildWithContinuationNotAttachedTest ()
 804                 {
 805                         var task = new Task(() =>
 806                         {
 807                                 Task.Factory.StartNew(() =>     {
 808                                         Thread.Sleep (200);
 809                                 }, TaskCreationOptions.AttachedToParent).ContinueWith(t => {
 810                                         Thread.Sleep (3000);
 811                                 });
 812                         });
 813                         task.Start();
 814                         Assert.IsTrue (task.Wait(400));
 815                 }
 816
 817                 [Test]
 818                 public void WaitChildWithNesting ()
 819                 {
 820                         var result = false;
 821                         var t = Task.Factory.StartNew (() => {
 822                                 Task.Factory.StartNew (() => {
 823                                         Task.Factory.StartNew (() => {
 824                                                 Thread.Sleep (500);
 825                                                 result = true;
 826                                         }, TaskCreationOptions.AttachedToParent);
 827                                 }, TaskCreationOptions.AttachedToParent);
 828                         });
 829                         Assert.IsTrue (t.Wait (4000), "#1");
 830                         Assert.IsTrue (result, "#2");
 831                 }
 832
 833                 [Test]
 834                 public void DoubleWaitTest ()
 835                 {
 836                         ParallelTestHelper.Repeat (delegate {
 837                                 var evt = new ManualResetEventSlim ();
 838                                 var monitor = new object ();
 839                                 int finished = 0;
 840                                 var t = Task.Factory.StartNew (delegate {
 841                                                 var r = evt.Wait (5000);
 842                                                 lock (monitor) {
 843                                                         finished ++;
 844                                                         Monitor.Pulse (monitor);
 845                                                 }
 846                                                 return r ? 1 : 10; //1 -> ok, 10 -> evt wait failed
 847                                         });
 848                                 var cntd = new CountdownEvent (2);
 849                                 var cntd2 = new CountdownEvent (2);
 850
 851                                 int r1 = 0, r2 = 0;
 852                                 ThreadPool.QueueUserWorkItem (delegate {
 853                                                 cntd.Signal ();
 854                                                 if (!t.Wait (1000))
 855                                                         r1 = 20; // 20 -> task wait failed
 856                                                 else if (t.Result != 1)
 857                                                         r1 = 30 + t.Result; // 30 -> task result is bad
 858                                                 else
 859                                                         r1 = 2; //2 -> ok
 860                                                 cntd2.Signal ();
 861                                                 lock (monitor) {
 862                                                         finished ++;
 863                                                         Monitor.Pulse (monitor);
 864                                                 }
 865                                         });
 866                                 ThreadPool.QueueUserWorkItem (delegate {
 867                                                 cntd.Signal ();
 868                                                 if (!t.Wait (1000))
 869                                                         r2 = 40; // 40 -> task wait failed
 870                                                 else if (t.Result != 1)
 871                                                         r2 = 50 + t.Result; // 50 -> task result is bad
 872                                                 else
 873                                                         r2 = 3; //3 -> ok
 874
 875                                                 cntd2.Signal ();
 876                                                 lock (monitor) {
 877                                                         finished ++;
 878                                                         Monitor.Pulse (monitor);
 879                                                 }
 880                                         });
 881                                 Assert.IsTrue (cntd.Wait (2000), "#1");
 882                                 evt.Set ();
 883                                 Assert.IsTrue (cntd2.Wait (2000), "#2");
 884                                 Assert.AreEqual (2, r1, "r1");
 885                                 Assert.AreEqual (3, r2, "r2");
 886
 887                                 // Wait for everything to finish to avoid overloading the tpool
 888                                 lock (monitor) {
 889                                         while (true) {
 890                                                 if (finished == 3)
 891                                                         break;
 892                                                 else
 893                                                         Monitor.Wait (monitor);
 894                                         }
 895                                 }
 896                         }, 10);
 897                 }
 898
 899                 [Test]
 900                 public void DoubleTimeoutedWaitTest ()
 901                 {
 902                         var evt = new ManualResetEventSlim ();
 903                         var t = new Task (delegate { });
 904                         var cntd = new CountdownEvent (2);
 905
 906                         bool r1 = false, r2 = false;
 907                         ThreadPool.QueueUserWorkItem (delegate { r1 = !t.Wait (100); cntd.Signal (); });
 908                         ThreadPool.QueueUserWorkItem (delegate { r2 = !t.Wait (100); cntd.Signal (); });
 909
 910                         cntd.Wait (2000);
 911                         Assert.IsTrue (r1);
 912                         Assert.IsTrue (r2);
 913                 }
 914
 915                 [Test]
 916                 public void RunSynchronously ()
 917                 {
 918                         var val = 0;
 919                         Task t = new Task (() => { Thread.Sleep (100); val = 1; });
 920                         t.RunSynchronously ();
 921
 922                         Assert.AreEqual (1, val, "#1");
 923
 924                         t = new Task (() => { Thread.Sleep (0); val = 2; });
 925
 926                         bool? previouslyQueued = null;
 927
 928                         var scheduler = new MockScheduler ();
 929                         scheduler.TryExecuteTaskInlineHandler += (task, b) => {
 930                                 previouslyQueued = b;
 931                         };
 932
 933                         t.RunSynchronously (scheduler);
 934
 935                         Assert.AreEqual (2, val, "#2");
 936                         Assert.AreEqual (false, previouslyQueued, "#2a");
 937                 }
 938
 939                 [Test]
 940                 public void RunSynchronouslyArgumentChecks ()
 941                 {
 942                         Task t = new Task (() => { });
 943                         try {
 944                                 t.RunSynchronously (null);
 945                                 Assert.Fail ("#1");
 946                         } catch (ArgumentNullException) {
 947                         }
 948                 }
 949
 950                 [Test]
 951                 public void RunSynchronously_SchedulerException ()
 952                 {
 953                         var scheduler = new MockScheduler ();
 954                         scheduler.TryExecuteTaskInlineHandler += (task, b) => {
 955                                 throw new ApplicationException ();
 956                         };
 957
 958                         Task t = new Task (() => { });
 959                         try {
 960                                 t.RunSynchronously (scheduler);
 961                                 Assert.Fail ();
 962                         } catch (Exception e) {
 963                                 Assert.AreEqual (t.Exception.InnerException, e);
 964                         }
 965                 }
 966
 967                 [Test]
 968                 public void RunSynchronouslyWithAttachedChildren ()
 969                 {
 970                         var result = false;
 971                         var t = new Task (() => {
 972                                 Task.Factory.StartNew (() => { Thread.Sleep (500); result = true; }, TaskCreationOptions.AttachedToParent);
 973                         });
 974                         t.RunSynchronously ();
 975                         Assert.IsTrue (result);
 976                 }
 977
 978                 [Test]
 979                 public void RunSynchronouslyOnContinuation ()
 980                 {
 981                         Task t = new Task<int> (() => 1);
 982                         t = t.ContinueWith (l => { });
 983                         try {
 984                                 t.RunSynchronously ();
 985                                 Assert.Fail ("#1");
 986                         } catch (InvalidOperationException) {
 987                         }
 988                 }
 989
 990                 [Test]
 991                 public void UnobservedExceptionOnFinalizerThreadTest ()
 992                 {
 993                         bool wasCalled = false;
 994                         TaskScheduler.UnobservedTaskException += (o, args) => {
 995                                 wasCalled = true;
 996                                 args.SetObserved ();
 997                         };
 998                         var inner = new ApplicationException ();
 999                         Thread t = new Thread (delegate () {
1000                                         Task.Factory.StartNew (() => { throw inner; });
1001                                 });
1002                         t.Start ();
1003                         t.Join ();
1004                         Thread.Sleep (1000);
1005                         GC.Collect ();
1006                         Thread.Sleep (1000);
1007                         GC.WaitForPendingFinalizers ();
1008
1009                         Assert.IsTrue (wasCalled);
1010                 }
1011
1012                 [Test, ExpectedException (typeof (InvalidOperationException))]
1013                 public void StartFinishedTaskTest ()
1014                 {
1015                         var t = Task.Factory.StartNew (delegate () { });
1016                         t.Wait ();
1017
1018                         t.Start ();
1019                 }
1020
1021                 [Test]
1022                 public void Start_NullArgument ()
1023                 {
1024                         var t = new Task (() => { });
1025                         try {
1026                                 t.Start (null);
1027                                 Assert.Fail ();
1028                         } catch (ArgumentNullException) {
1029                         }
1030                 }
1031
1032                 [Test, ExpectedException (typeof (InvalidOperationException))]
1033                 public void DisposeUnstartedTest ()
1034                 {
1035                         var t = new Task (() => { });
1036                         t.Dispose ();
1037                 }
1038
1039                 [Test]
1040                 public void ThrowingUnrelatedCanceledExceptionTest ()
1041                 {
1042                         Task t = new Task (() => {
1043                                 throw new TaskCanceledException ();
1044                         });
1045
1046                         t.RunSynchronously ();
1047                         Assert.IsTrue (t.IsFaulted);
1048                         Assert.IsFalse (t.IsCanceled);
1049                 }
1050
1051                 [Test]
1052                 public void CanceledContinuationExecuteSynchronouslyTest ()
1053                 {
1054                         var source = new CancellationTokenSource();
1055                         var token = source.Token;
1056                         var evt = new ManualResetEventSlim ();
1057                         bool result = false;
1058                         bool thrown = false;
1059
1060                         var task = Task.Factory.StartNew (() => evt.Wait (100));
1061                         var cont = task.ContinueWith (t => result = true, token, TaskContinuationOptions.ExecuteSynchronously, TaskScheduler.Default);
1062
1063                         source.Cancel();
1064                         evt.Set ();
1065                         task.Wait (100);
1066                         try {
1067                                 cont.Wait (100);
1068                         } catch (Exception ex) {
1069                                 thrown = true;
1070                         }
1071
1072                         Assert.IsTrue (task.IsCompleted);
1073                         Assert.IsTrue (cont.IsCanceled);
1074                         Assert.IsFalse (result);
1075                         Assert.IsTrue (thrown);
1076                 }
1077
1078                 [Test]
1079                 public void WhenChildTaskErrorIsThrownParentTaskShouldBeFaulted ()
1080                 {
1081                         Task innerTask = null;
1082                         var testTask = new Task (() =>
1083                         {
1084                                 innerTask = new Task (() =>
1085                                 {
1086                                         throw new InvalidOperationException ();
1087                                 }, TaskCreationOptions.AttachedToParent);
1088                                 innerTask.RunSynchronously ();
1089                         });
1090                         testTask.RunSynchronously ();
1091
1092                         Assert.AreNotEqual (TaskStatus.Running, testTask.Status);
1093                         Assert.IsNotNull (innerTask);
1094                         Assert.IsTrue (innerTask.IsFaulted);
1095                         Assert.IsNotNull (testTask.Exception);
1096                         Assert.IsTrue (testTask.IsFaulted);
1097                         Assert.IsNotNull (innerTask.Exception);
1098                 }
1099
1100                 [Test]
1101                 public void WhenChildTaskErrorIsThrownOnlyOnFaultedContinuationShouldExecute ()
1102                 {
1103                         var continuationRan = false;
1104                         var testTask = new Task (() =>
1105                         {
1106                                 var task = new Task (() =>
1107                                 {
1108                                         throw new InvalidOperationException();
1109                                 }, TaskCreationOptions.AttachedToParent);
1110                                 task.RunSynchronously ();
1111                         });
1112                         var onErrorTask = testTask.ContinueWith (x => continuationRan = true, TaskContinuationOptions.OnlyOnFaulted);
1113                         testTask.RunSynchronously ();
1114                         onErrorTask.Wait (100);
1115                         Assert.IsTrue (continuationRan);
1116                 }
1117
1118                 [Test]
1119                 public void WhenChildTaskErrorIsThrownNotOnFaultedContinuationShouldNotBeExecuted ()
1120                 {
1121                         var continuationRan = false;
1122                         var testTask = new Task (() =>
1123                         {
1124                                 var task = new Task (() =>
1125                                 {
1126                                         throw new InvalidOperationException();
1127                                 }, TaskCreationOptions.AttachedToParent);
1128                                 task.RunSynchronously();
1129                         });
1130                         var onErrorTask = testTask.ContinueWith (x => continuationRan = true, TaskContinuationOptions.NotOnFaulted);
1131                         testTask.RunSynchronously ();
1132                         Assert.IsTrue (onErrorTask.IsCompleted);
1133                         Assert.IsFalse (onErrorTask.IsFaulted);
1134                         Assert.IsFalse (continuationRan);
1135                 }
1136
1137                 [Test]
1138                 public void WhenChildTaskSeveralLevelsDeepHandlesAggregateExceptionErrorStillBubblesToParent ()
1139                 {
1140                         var continuationRan = false;
1141                         AggregateException e = null;
1142                         var testTask = new Task (() =>
1143                         {
1144                                 var child1 = new Task (() =>
1145                                 {
1146                                         var child2 = new Task (() =>
1147                                         {
1148                                                 throw new InvalidOperationException();
1149                                         }, TaskCreationOptions.AttachedToParent);
1150                                         child2.RunSynchronously ();
1151                                 }, TaskCreationOptions.AttachedToParent);
1152
1153                                 child1.RunSynchronously();
1154                                 e = child1.Exception;
1155                                 child1.Exception.Handle (ex => true);
1156                         });
1157                         var onErrorTask = testTask.ContinueWith (x => continuationRan = true, TaskContinuationOptions.OnlyOnFaulted);
1158                         testTask.RunSynchronously ();
1159                         onErrorTask.Wait (1000);
1160                         Assert.IsNotNull (e);
1161                         Assert.IsTrue (continuationRan);
1162                 }
1163
1164                 [Test]
1165                 public void AlreadyCompletedChildTaskShouldRunContinuationImmediately ()
1166                 {
1167                         string result = "Failed";
1168                         var testTask = new Task (() =>
1169                         {
1170                                 var child = new Task<string> (() =>
1171                                 {
1172                                         return "Success";
1173                                 }, TaskCreationOptions.AttachedToParent);
1174                                 child.RunSynchronously ();
1175                                 child.ContinueWith (x => { Thread.Sleep (50); result = x.Result; }, TaskContinuationOptions.AttachedToParent | TaskContinuationOptions.NotOnFaulted);
1176                         });
1177                         testTask.RunSynchronously ();
1178
1179                         Assert.AreEqual ("Success", result);
1180                 }
1181
1182                 [Test]
1183                 public void InlineNotTrashingParentRelationship ()
1184                 {
1185                         bool r1 = false, r2 = false;
1186                         var t = new Task (() => {
1187                                 new Task (() => { r1 = true; }, TaskCreationOptions.AttachedToParent).RunSynchronously ();
1188                                 Task.Factory.StartNew (() => { Thread.Sleep (100); r2 = true; }, TaskCreationOptions.AttachedToParent);
1189                         });
1190                         t.RunSynchronously ();
1191
1192                         Assert.IsTrue (r1);
1193                         Assert.IsTrue (r2);
1194                 }
1195
1196                 [Test]
1197                 public void AsyncWaitHandleSet ()
1198                 {
1199                         var task = new TaskFactory ().StartNew (() => { });
1200                         var ar = (IAsyncResult)task;
1201                         Assert.IsFalse (ar.CompletedSynchronously, "#1");
1202                         Assert.IsTrue (ar.AsyncWaitHandle.WaitOne (5000), "#2");
1203                 }
1204
1205                 [Test]
1206                 public void StartOnBrokenScheduler ()
1207                 {
1208                         var t = new Task (delegate { });
1209
1210                         try {
1211                                 t.Start (new ExceptionScheduler ());
1212                                 Assert.Fail ("#1");
1213                         } catch (TaskSchedulerException e) {
1214                                 Assert.AreEqual (TaskStatus.Faulted, t.Status, "#2");
1215                                 Assert.AreSame (e, t.Exception.InnerException, "#3");
1216                                 Assert.IsTrue (e.InnerException is ApplicationException, "#4");
1217                         }
1218                 }
1219
1220                 [Test]
1221                 public void ContinuationOnBrokenScheduler ()
1222                 {
1223                         var s = new ExceptionScheduler ();
1224                         Task t = new Task(delegate {});
1225
1226                         var t2 = t.ContinueWith (delegate {
1227                         }, TaskContinuationOptions.ExecuteSynchronously, s);
1228
1229                         var t3 = t.ContinueWith (delegate {
1230                         }, TaskContinuationOptions.ExecuteSynchronously, s);
1231
1232                         t.Start ();
1233
1234                         try {
1235                                 Assert.IsTrue (t3.Wait (2000), "#0");
1236                                 Assert.Fail ("#1");
1237                         } catch (AggregateException e) {
1238                         }
1239
1240                         Assert.AreEqual (TaskStatus.Faulted, t2.Status, "#2");
1241                         Assert.AreEqual (TaskStatus.Faulted, t3.Status, "#3");
1242                 }
1243
1244                 [Test]
1245                 public void Delay_Invalid ()
1246                 {
1247                         try {
1248                                 Task.Delay (-100);
1249                         } catch (ArgumentOutOfRangeException) {
1250                         }
1251                 }
1252
1253                 [Test]
1254                 public void Delay_Start ()
1255                 {
1256                         var t = Task.Delay (5000);
1257                         try {
1258                                 t.Start ();
1259                         } catch (InvalidOperationException) {
1260                         }
1261                 }
1262
1263                 [Test]
1264                 public void Delay_Simple ()
1265                 {
1266                         var t = Task.Delay (300);
1267                         Assert.IsTrue (TaskStatus.WaitingForActivation == t.Status || TaskStatus.Running == t.Status, "#1");
1268                         Assert.IsTrue (t.Wait (400), "#2");
1269                 }
1270
1271                 [Test]
1272                 public void Delay_Cancelled ()
1273                 {
1274                         var cancelation = new CancellationTokenSource ();
1275
1276                         var t = Task.Delay (5000, cancelation.Token);
1277                         Assert.IsTrue (TaskStatus.WaitingForActivation == t.Status || TaskStatus.Running == t.Status, "#1");
1278                         cancelation.Cancel ();
1279                         try {
1280                                 t.Wait (1000);
1281                                 Assert.Fail ("#2");
1282                         } catch (AggregateException) {
1283                                 Assert.AreEqual (TaskStatus.Canceled, t.Status, "#3");
1284                         }
1285
1286                         cancelation = new CancellationTokenSource ();
1287                         t = Task.Delay (Timeout.Infinite, cancelation.Token);
1288                         Assert.AreEqual (TaskStatus.WaitingForActivation, t.Status, "#11");
1289                         cancelation.Cancel ();
1290                         try {
1291                                 t.Wait (1000);
1292                                 Assert.Fail ("#12");
1293                         } catch (AggregateException) {
1294                                 Assert.AreEqual (TaskStatus.Canceled, t.Status, "#13");
1295                         }
1296                 }
1297
1298                 [Test]
1299                 public void Delay_TimeManagement ()
1300                 {
1301                         var delay1 = Task.Delay(50);
1302                         var delay2 = Task.Delay(25);
1303                         Assert.IsTrue (Task.WhenAny(new[] { delay1, delay2 }).Wait (1000));
1304                         Assert.AreEqual (TaskStatus.RanToCompletion, delay2.Status);
1305                 }
1306
1307                 [Test]
1308                 public void WaitAny_WithNull ()
1309                 {
1310                         var tasks = new [] {
1311                                 Task.FromResult (2),
1312                                 null
1313                         };
1314
1315                         try {
1316                                 Task.WaitAny (tasks);
1317                                 Assert.Fail ();
1318                         } catch (ArgumentException) {
1319                         }
1320                 }
1321
1322                 [Test]
1323                 public void WhenAll_Empty ()
1324                 {
1325                         var tasks = new Task[0];
1326
1327                         Task t = Task.WhenAll(tasks);
1328
1329                         Assert.IsTrue(t.Wait(1000), "#1");
1330                 }
1331
1332                 [Test]
1333                 public void WhenAll_WithNull ()
1334                 {
1335                         var tasks = new[] {
1336                                 Task.FromResult (2),
1337                                 null
1338                         };
1339
1340                         try {
1341                                 Task.WhenAll (tasks);
1342                                 Assert.Fail ("#1");
1343                         } catch (ArgumentException) {
1344                         }
1345
1346                         tasks = null;
1347                         try {
1348                                 Task.WhenAll (tasks);
1349                                 Assert.Fail ("#2");
1350                         } catch (ArgumentException) {
1351                         }
1352                 }
1353
1354                 [Test]
1355                 public void WhenAll_Start ()
1356                 {
1357                         Task[] tasks = new[] {
1358                                 Task.FromResult (2),
1359                         };
1360
1361                         var t = Task.WhenAll (tasks);
1362                         Assert.AreEqual (TaskStatus.RanToCompletion, t.Status, "#1");
1363
1364                         try {
1365                                 t.Start ();
1366                                 Assert.Fail ("#2");
1367                         } catch (InvalidOperationException) {
1368                         }
1369
1370                         tasks = new [] {
1371                                 new Task (delegate { }),
1372                         };
1373
1374                         t = Task.WhenAll (tasks);
1375                         Assert.AreEqual (TaskStatus.WaitingForActivation, t.Status, "#11");
1376
1377                         try {
1378                                 t.Start ();
1379                                 Assert.Fail ("#12");
1380                         } catch (InvalidOperationException) {
1381                         }
1382                 }
1383
1384                 [Test]
1385                 public void WhenAll_Cancelled ()
1386                 {
1387                         var cancelation = new CancellationTokenSource ();
1388                         var tasks = new Task[] {
1389                                 new Task (delegate { }),
1390                                 new Task (delegate { }, cancelation.Token)
1391                         };
1392
1393                         cancelation.Cancel ();
1394
1395                         var t = Task.WhenAll (tasks);
1396                         Assert.AreEqual (TaskStatus.WaitingForActivation, t.Status, "#1");
1397                         tasks[0].Start ();
1398
1399                         try {
1400                                 Assert.IsTrue (t.Wait (1000), "#2");
1401                                 Assert.Fail ("#2a");
1402                         } catch (AggregateException e) {
1403                                 Assert.That (e.InnerException, Is.TypeOf (typeof (TaskCanceledException)), "#3");
1404                         }
1405                 }
1406
1407                 [Test]
1408                 public void WhenAll_Faulted ()
1409                 {
1410                         var tcs = new TaskCompletionSource<object> ();
1411                         tcs.SetException (new ApplicationException ());
1412
1413                         var tcs2 = new TaskCompletionSource<object> ();
1414                         tcs2.SetException (new InvalidTimeZoneException ());
1415
1416                         var cancelation = new CancellationTokenSource ();
1417                         var tasks = new Task[] {
1418                                 new Task (delegate { }),
1419                                 new Task (delegate { }, cancelation.Token),
1420                                 tcs.Task,
1421                                 tcs2.Task
1422                         };
1423
1424                         cancelation.Cancel ();
1425
1426                         var t = Task.WhenAll (tasks);
1427                         Assert.AreEqual (TaskStatus.WaitingForActivation, t.Status, "#1");
1428                         tasks[0].Start ();
1429
1430                         try {
1431                                 Assert.IsTrue (t.Wait (1000), "#2");
1432                                 Assert.Fail ("#2a");
1433                         } catch (AggregateException e) {
1434                                 Assert.That (e.InnerException, Is.TypeOf (typeof (ApplicationException)), "#3");
1435                                 Assert.That (e.InnerExceptions[1], Is.TypeOf (typeof (InvalidTimeZoneException)), "#4");
1436                         }
1437                 }
1438
1439                 [Test]
1440                 public void WhenAll ()
1441                 {
1442                         var t1 = new Task (delegate { });
1443                         var t2 = new Task (delegate { t1.Start (); });
1444
1445                         var tasks = new Task[] {
1446                                 t1,
1447                                 t2,
1448                         };
1449
1450                         var t = Task.WhenAll (tasks);
1451                         Assert.AreEqual (TaskStatus.WaitingForActivation, t.Status, "#1");
1452                         t2.Start ();
1453
1454                         Assert.IsTrue (t.Wait (1000), "#2");
1455                 }
1456
1457                 [Test]
1458                 public void WhenAllResult_Empty ()
1459                 {
1460                         var tasks = new Task<int>[0];
1461
1462                         Task<int[]> t = Task.WhenAll(tasks);
1463
1464                         Assert.IsTrue(t.Wait(1000), "#1");
1465                         Assert.IsNotNull(t.Result, "#2");
1466                         Assert.AreEqual(t.Result.Length, 0, "#3");
1467                 }
1468
1469                 [Test]
1470                 public void WhenAllResult_WithNull ()
1471                 {
1472                         var tasks = new[] {
1473                                 Task.FromResult (2),
1474                                 null
1475                         };
1476
1477                         try {
1478                                 Task.WhenAll<int> (tasks);
1479                                 Assert.Fail ("#1");
1480                         } catch (ArgumentException) {
1481                         }
1482
1483                         tasks = null;
1484                         try {
1485                                 Task.WhenAll<int> (tasks);
1486                                 Assert.Fail ("#2");
1487                         } catch (ArgumentException) {
1488                         }
1489                 }
1490
1491                 [Test]
1492                 public void WhenAllResult_Cancelled ()
1493                 {
1494                         var cancelation = new CancellationTokenSource ();
1495                         var tasks = new [] {
1496                                 new Task<int> (delegate { return 9; }),
1497                                 new Task<int> (delegate { return 1; }, cancelation.Token)
1498                         };
1499
1500                         cancelation.Cancel ();
1501
1502                         var t = Task.WhenAll (tasks);
1503                         Assert.AreEqual (TaskStatus.WaitingForActivation, t.Status, "#1");
1504                         tasks[0].Start ();
1505
1506                         try {
1507                                 Assert.IsTrue (t.Wait (1000), "#2");
1508                                 Assert.Fail ("#2a");
1509                         } catch (AggregateException e) {
1510                                 Assert.That (e.InnerException, Is.TypeOf (typeof (TaskCanceledException)), "#3");
1511                         }
1512
1513                         try {
1514                                 var r = t.Result;
1515                                 Assert.Fail ("#4");
1516                         } catch (AggregateException) {
1517                         }
1518                 }
1519
1520                 [Test]
1521                 public void WhenAllResult ()
1522                 {
1523                         var t1 = new Task<string> (delegate { return "a"; });
1524                         var t2 = new Task<string> (delegate { t1.Start (); return "b"; });
1525
1526                         var tasks = new [] {
1527                                 t1,
1528                                 t2,
1529                         };
1530
1531                         var t = Task.WhenAll<string> (tasks);
1532                         Assert.AreEqual (TaskStatus.WaitingForActivation, t.Status, "#1");
1533                         t2.Start ();
1534
1535                         Assert.IsTrue (t.Wait (1000), "#2");
1536                         Assert.AreEqual (2, t.Result.Length, "#3");
1537                         Assert.AreEqual ("a", t.Result[0], "#3a");
1538                         Assert.AreEqual ("b", t.Result[1], "#3b");
1539                 }
1540
1541                 [Test]
1542                 public void WhenAllResult_Completed ()
1543                 {
1544                         var tasks = new[] {
1545                                 Task.FromResult (1),
1546                                 Task.FromResult (2)
1547                         };
1548
1549                         var t = Task.WhenAll<int> (tasks);
1550                         Assert.AreEqual (TaskStatus.RanToCompletion, t.Status, "#1");
1551                         Assert.AreEqual (2, t.Result.Length, "#2");
1552                         Assert.AreEqual (1, t.Result[0], "#2a");
1553                         Assert.AreEqual (2, t.Result[1], "#2b");
1554                 }
1555
1556                 [Test]
1557                 public void WhenAny_WithNull ()
1558                 {
1559                         var tasks = new Task[] {
1560                                 Task.FromResult (2),
1561                                 null
1562                         };
1563
1564                         try {
1565                                 Task.WhenAny (tasks);
1566                                 Assert.Fail ("#1");
1567                         } catch (ArgumentException) {
1568                         }
1569
1570                         tasks = null;
1571                         try {
1572                                 Task.WhenAny (tasks);
1573                                 Assert.Fail ("#2");
1574                         } catch (ArgumentException) {
1575                         }
1576
1577                         try {
1578                                 Task.WhenAny (new Task[0]);
1579                                 Assert.Fail ("#3");
1580                         } catch (ArgumentException) {
1581                         }
1582                 }
1583
1584                 [Test]
1585                 public void WhenAny_Start ()
1586                 {
1587                         Task[] tasks = new[] {
1588                                 Task.FromResult (2),
1589                         };
1590
1591                         var t = Task.WhenAny (tasks);
1592                         Assert.AreEqual (TaskStatus.RanToCompletion, t.Status, "#1");
1593
1594                         try {
1595                                 t.Start ();
1596                                 Assert.Fail ("#2");
1597                         } catch (InvalidOperationException) {
1598                         }
1599
1600                         tasks = new[] {
1601                                 new Task (delegate { }),
1602                         };
1603
1604                         t = Task.WhenAny (tasks);
1605                         Assert.AreEqual (TaskStatus.WaitingForActivation, t.Status, "#11");
1606
1607                         try {
1608                                 t.Start ();
1609                                 Assert.Fail ("#12");
1610                         } catch (InvalidOperationException) {
1611                         }
1612                 }
1613
1614                 [Test]
1615                 public void WhenAny_Cancelled ()
1616                 {
1617                         var cancelation = new CancellationTokenSource ();
1618                         var tasks = new Task[] {
1619                                 new Task (delegate { }),
1620                                 new Task (delegate { }, cancelation.Token)
1621                         };
1622
1623                         cancelation.Cancel ();
1624
1625                         var t = Task.WhenAny (tasks);
1626                         Assert.AreEqual (TaskStatus.RanToCompletion, t.Status, "#1");
1627                         tasks[0].Start ();
1628
1629                         Assert.IsTrue (t.Wait (1000), "#2");
1630                         Assert.AreEqual (TaskStatus.Canceled, t.Result.Status, "#3");
1631                 }
1632
1633                 [Test]
1634                 public void WhenAny_Faulted ()
1635                 {
1636                         var tcs = new TaskCompletionSource<object> ();
1637                         tcs.SetException (new ApplicationException ());
1638
1639                         var tcs2 = new TaskCompletionSource<object> ();
1640                         tcs2.SetException (new InvalidTimeZoneException ());
1641
1642                         var cancelation = new CancellationTokenSource ();
1643                         var tasks = new Task[] {
1644                                 new Task (delegate { }),
1645                                 tcs.Task,
1646                                 new Task (delegate { }, cancelation.Token),
1647                                 tcs2.Task
1648                         };
1649
1650                         cancelation.Cancel ();
1651
1652                         var t = Task.WhenAny (tasks);
1653                         Assert.AreEqual (TaskStatus.RanToCompletion, t.Status, "#1");
1654                         tasks[0].Start ();
1655
1656                         Assert.IsTrue (t.Wait (1000), "#2");
1657                         Assert.IsNull (t.Exception, "#3");
1658
1659                         Assert.That (t.Result.Exception.InnerException, Is.TypeOf (typeof (ApplicationException)), "#4");
1660                 }
1661
1662                 [Test]
1663                 public void WhenAny ()
1664                 {
1665                         var t1 = new Task (delegate { });
1666                         var t2 = new Task (delegate { t1.Start (); });
1667
1668                         var tasks = new Task[] {
1669                                 t1,
1670                                 t2,
1671                         };
1672
1673                         var t = Task.WhenAny (tasks);
1674                         Assert.AreEqual (TaskStatus.WaitingForActivation, t.Status, "#1");
1675                         t2.Start ();
1676
1677                         Assert.IsTrue (t.Wait (1000), "#2");
1678                         Assert.IsNotNull (t.Result, "#3");
1679                 }
1680
1681                 [Test]
1682                 public void WhenAnyResult_WithNull ()
1683                 {
1684                         var tasks = new [] {
1685                                 Task.FromResult (2),
1686                                 null
1687                         };
1688
1689                         try {
1690                                 Task.WhenAny<int> (tasks);
1691                                 Assert.Fail ("#1");
1692                         } catch (ArgumentException) {
1693                         }
1694
1695                         tasks = null;
1696                         try {
1697                                 Task.WhenAny<int> (tasks);
1698                                 Assert.Fail ("#2");
1699                         } catch (ArgumentException) {
1700                         }
1701
1702                         try {
1703                                 Task.WhenAny<short> (new Task<short>[0]);
1704                                 Assert.Fail ("#3");
1705                         } catch (ArgumentException) {
1706                         }
1707                 }
1708
1709                 [Test]
1710                 public void WhenAnyResult_Start ()
1711                 {
1712                         var tasks = new[] {
1713                                 Task.FromResult (2),
1714                         };
1715
1716                         var t = Task.WhenAny<int> (tasks);
1717                         Assert.AreEqual (TaskStatus.RanToCompletion, t.Status, "#1");
1718
1719                         try {
1720                                 t.Start ();
1721                                 Assert.Fail ("#2");
1722                         } catch (InvalidOperationException) {
1723                         }
1724
1725                         tasks = new[] {
1726                                 new Task<int> (delegate { return 55; }),
1727                         };
1728
1729                         t = Task.WhenAny<int> (tasks);
1730                         Assert.AreEqual (TaskStatus.WaitingForActivation, t.Status, "#11");
1731
1732                         try {
1733                                 t.Start ();
1734                                 Assert.Fail ("#12");
1735                         } catch (InvalidOperationException) {
1736                         }
1737                 }
1738
1739                 [Test]
1740                 public void WhenAnyResult_Cancelled ()
1741                 {
1742                         var cancelation = new CancellationTokenSource ();
1743                         var tasks = new [] {
1744                                 new Task<double> (delegate { return 1.1; }),
1745                                 new Task<double> (delegate { return -4.4; }, cancelation.Token)
1746                         };
1747
1748                         cancelation.Cancel ();
1749
1750                         var t = Task.WhenAny<double> (tasks);
1751                         Assert.AreEqual (TaskStatus.RanToCompletion, t.Status, "#1");
1752                         tasks[0].Start ();
1753
1754                         Assert.IsTrue (t.Wait (1000), "#2");
1755                         Assert.AreEqual (TaskStatus.Canceled, t.Result.Status, "#3");
1756                 }
1757
1758                 [Test]
1759                 public void WhenAnyResult_Faulted ()
1760                 {
1761                         var tcs = new TaskCompletionSource<object> ();
1762                         tcs.SetException (new ApplicationException ());
1763
1764                         var tcs2 = new TaskCompletionSource<object> ();
1765                         tcs2.SetException (new InvalidTimeZoneException ());
1766
1767                         var cancelation = new CancellationTokenSource ();
1768                         var tasks = new Task<object>[] {
1769                                 new Task<object> (delegate { return null; }),
1770                                 tcs.Task,
1771                                 new Task<object> (delegate { return ""; }, cancelation.Token),
1772                                 tcs2.Task
1773                         };
1774
1775                         cancelation.Cancel ();
1776
1777                         var t = Task.WhenAny<object> (tasks);
1778                         Assert.AreEqual (TaskStatus.RanToCompletion, t.Status, "#1");
1779                         tasks[0].Start ();
1780
1781                         Assert.IsTrue (t.Wait (1000), "#2");
1782                         Assert.IsNull (t.Exception, "#3");
1783
1784                         Assert.That (t.Result.Exception.InnerException, Is.TypeOf (typeof (ApplicationException)), "#4");
1785                 }
1786
1787                 [Test]
1788                 public void WhenAnyResult ()
1789                 {
1790                         var t1 = new Task<byte> (delegate { return 3; });
1791                         var t2 = new Task<byte> (delegate { t1.Start (); return 2; });
1792
1793                         var tasks = new [] {
1794                                 t1,
1795                                 t2,
1796                         };
1797
1798                         var t = Task.WhenAny<byte> (tasks);
1799                         Assert.AreEqual (TaskStatus.WaitingForActivation, t.Status, "#1");
1800                         t2.Start ();
1801
1802                         Assert.IsTrue (t.Wait (1000), "#2");
1803                         Assert.IsTrue (t.Result.Result > 1, "#3");
1804                 }
1805
1806                 [Test]
1807                 public void ContinueWith_StateValue ()
1808                 {
1809                         var t = Task.Factory.StartNew (l => {
1810                                 Assert.AreEqual (1, l, "a-1");
1811                         }, 1);
1812
1813                         var c = t.ContinueWith ((a, b) => {
1814                                 Assert.AreEqual (t, a, "c-1");
1815                                 Assert.AreEqual (2, b, "c-2");
1816                         }, 2);
1817
1818                         var d = t.ContinueWith ((a, b) => {
1819                                 Assert.AreEqual (t, a, "d-1");
1820                                 Assert.AreEqual (3, b, "d-2");
1821                                 return 77;
1822                         }, 3);
1823
1824                         Assert.IsTrue (d.Wait (1000), "#1");
1825
1826                         Assert.AreEqual (1, t.AsyncState, "#2");
1827                         Assert.AreEqual (2, c.AsyncState, "#3");
1828                         Assert.AreEqual (3, d.AsyncState, "#4");
1829                 }
1830
1831                 [Test]
1832                 public void ContinueWith_StateValueGeneric ()
1833                 {
1834                         var t = Task<int>.Factory.StartNew (l => {
1835                                 Assert.AreEqual (1, l, "a-1");
1836                                 return 80;
1837                         }, 1);
1838
1839                         var c = t.ContinueWith ((a, b) => {
1840                                 Assert.AreEqual (t, a, "c-1");
1841                                 Assert.AreEqual (2, b, "c-2");
1842                                 return "c";
1843                         }, 2);
1844
1845                         var d = t.ContinueWith ((a, b) => {
1846                                 Assert.AreEqual (t, a, "d-1");
1847                                 Assert.AreEqual (3, b, "d-2");
1848                                 return 'd';
1849                         }, 3);
1850
1851                         Assert.IsTrue (d.Wait (1000), "#1");
1852
1853                         Assert.AreEqual (1, t.AsyncState, "#2");
1854                         Assert.AreEqual (80, t.Result, "#2r");
1855                         Assert.AreEqual (2, c.AsyncState, "#3");
1856                         Assert.AreEqual ("c", c.Result, "#3r");
1857                         Assert.AreEqual (3, d.AsyncState, "#4");
1858                         Assert.AreEqual ('d', d.Result, "#3r");
1859                 }
1860
1861                 [Test]
1862                 public void ContinueWith_CustomScheduleRejected ()
1863                 {
1864                         var scheduler = new NonInlineableScheduler ();
1865                         var t = Task.Factory.StartNew (delegate { }).
1866                                 ContinueWith (r => {}, CancellationToken.None, TaskContinuationOptions.ExecuteSynchronously, scheduler);
1867
1868                         Assert.IsTrue (t.Wait (5000));
1869                 }
1870
1871                 [Test]
1872                 public void FromResult ()
1873                 {
1874                         var t = Task.FromResult<object> (null);
1875                         Assert.IsTrue (t.IsCompleted, "#1");
1876                         Assert.AreEqual (null, t.Result, "#2");
1877                         t.Dispose ();
1878                         t.Dispose ();
1879                 }
1880
1881                 [Test]
1882                 public void LongRunning ()
1883                 {
1884                         bool? is_tp = null;
1885                         bool? is_bg = null;
1886                         var t = new Task (() => { is_tp = Thread.CurrentThread.IsThreadPoolThread; is_bg = Thread.CurrentThread.IsBackground; });
1887                         t.Start ();
1888                         Assert.IsTrue (t.Wait (5000), "#0");
1889                         Assert.IsTrue ((bool)is_tp, "#1");
1890                         Assert.IsTrue ((bool)is_bg, "#2");
1891
1892                         is_tp = null;
1893                         is_bg = null;
1894                         t = new Task (() => { is_tp = Thread.CurrentThread.IsThreadPoolThread; is_bg = Thread.CurrentThread.IsBackground; }, TaskCreationOptions.LongRunning);
1895                         t.Start ();
1896                         Assert.IsTrue (t.Wait (5000), "#10");
1897                         Assert.IsFalse ((bool) is_tp, "#11");
1898                         Assert.IsTrue ((bool) is_bg, "#12");
1899                 }
1900
1901                 [Test]
1902                 public void Run_ArgumentCheck ()
1903                 {
1904                         try {
1905                                 Task.Run (null as Action);
1906                                 Assert.Fail ("#1");
1907                         } catch (ArgumentNullException) {
1908                         }
1909                 }
1910
1911                 [Test]
1912                 public void Run ()
1913                 {
1914                         bool ranOnDefaultScheduler = false;
1915                         var t = Task.Run (delegate { ranOnDefaultScheduler = Thread.CurrentThread.IsThreadPoolThread; });
1916                         Assert.AreEqual (TaskCreationOptions.DenyChildAttach, t.CreationOptions, "#1");
1917                         t.Wait ();
1918                         Assert.IsTrue (ranOnDefaultScheduler, "#2");
1919                 }
1920
1921                 [Test]
1922                 public void Run_Cancel ()
1923                 {
1924                         var t = Task.Run (() => 1, new CancellationToken (true));
1925                         try {
1926                                 var r = t.Result;
1927                                 Assert.Fail ("#1");
1928                         } catch (AggregateException) {
1929                         }
1930
1931                         Assert.IsTrue (t.IsCanceled, "#2");
1932                 }
1933
1934                 [Test]
1935                 public void Run_ExistingTaskT ()
1936                 {
1937                         var t = new Task<int> (() => 5);
1938                         var t2 = Task.Run (() => { t.Start (); return t; });
1939
1940                         Assert.IsTrue (t2.Wait (1000), "#1");
1941                         Assert.AreEqual (5, t2.Result, "#2");
1942                 }
1943
1944                 [Test]
1945                 public void Run_ExistingTask ()
1946                 {
1947                         var t = new Task (delegate { throw new Exception ("Foo"); });
1948                         var t2 = Task.Run (() => { t.Start (); return t; });
1949
1950                         try {
1951                                 t2.Wait (1000);
1952                                 Assert.Fail ();
1953                         } catch (Exception) {}
1954
1955                         Assert.AreEqual (TaskStatus.Faulted, t.Status, "#2");
1956                 }
1957
1958                 [Test]
1959                 public void DenyChildAttachTest ()
1960                 {
1961                         var mre = new ManualResetEventSlim ();
1962                         Task nested = null;
1963                         Task parent = Task.Factory.StartNew (() => {
1964                                 nested = Task.Factory.StartNew (() => mre.Wait (2000), TaskCreationOptions.AttachedToParent);
1965                         }, TaskCreationOptions.DenyChildAttach);
1966                         Assert.IsTrue (parent.Wait (1000), "#1");
1967                         mre.Set ();
1968                         Assert.IsTrue (nested.Wait (2000), "#2");
1969                 }
1970
1971                 class SynchronousScheduler : TaskScheduler
1972                 {
1973                         protected override IEnumerable<Task> GetScheduledTasks ()
1974                         {
1975                                 throw new NotImplementedException ();
1976                         }
1977
1978                         protected override void QueueTask (Task task)
1979                         {
1980                                 TryExecuteTaskInline (task, false);
1981                         }
1982
1983                         protected override bool TryExecuteTaskInline (Task task, bool taskWasPreviouslyQueued)
1984                         {
1985                                 return base.TryExecuteTask (task);
1986                         }
1987                 }
1988
1989                 [Test]
1990                 public void HideSchedulerTest ()
1991                 {
1992                         var mre = new ManualResetEventSlim ();
1993                         var ranOnDefault = false;
1994                         var scheduler = new SynchronousScheduler ();
1995
1996                         Task parent = Task.Factory.StartNew (() => {
1997                                 Task.Factory.StartNew (() => {
1998                                         ranOnDefault = Thread.CurrentThread.IsThreadPoolThread;
1999                                         mre.Set ();
2000                                 });
2001                         }, CancellationToken.None, TaskCreationOptions.HideScheduler, scheduler);
2002
2003                         Assert.IsTrue (mre.Wait (1000), "#1");
2004                         Assert.IsTrue (ranOnDefault, "#2");
2005                 }
2006
2007                 [Test]
2008                 public void LazyCancelationTest ()
2009                 {
2010                         var source = new CancellationTokenSource ();
2011                         source.Cancel ();
2012                         var parent = new Task (delegate {});
2013                         var cont = parent.ContinueWith (delegate {}, source.Token, TaskContinuationOptions.LazyCancellation, TaskScheduler.Default);
2014
2015                         Assert.AreNotEqual (TaskStatus.Canceled, cont.Status, "#1");
2016                         parent.Start ();
2017                         try {
2018                                 Assert.IsTrue (cont.Wait (1000), "#2");
2019                                 Assert.Fail ();
2020                         } catch (AggregateException ex) {
2021                                 Assert.That (ex.InnerException, Is.TypeOf (typeof (TaskCanceledException)), "#3");
2022                         }
2023                 }
2024
2025                 [Test]
2026                 public void ChildTaskWithUnscheduledContinuationAttachedToParent ()
2027                 {
2028                         Task inner = null;
2029                         var child = Task.Factory.StartNew (() => {
2030                                 inner  = Task.Run (() => {
2031                                         throw new ApplicationException ();
2032                                 }).ContinueWith (task => { }, TaskContinuationOptions.AttachedToParent | TaskContinuationOptions.NotOnFaulted | TaskContinuationOptions.ExecuteSynchronously);
2033                         });
2034
2035                         int counter = 0;
2036                         var t = child.ContinueWith (t2 => ++counter, TaskContinuationOptions.ExecuteSynchronously);
2037                         Assert.IsTrue (t.Wait (5000), "#1");
2038                         Assert.AreEqual (1, counter, "#2");
2039                         Assert.AreEqual (TaskStatus.RanToCompletion, child.Status, "#3");
2040                         Assert.AreEqual (TaskStatus.Canceled, inner.Status, "#4");
2041                 }
2042
2043                 [Test]
2044                 [Category("NotWorking")]
2045                 public void TaskContinuationChainLeak()
2046                 {
2047                         // Start cranking out tasks, starting each new task upon completion of and from inside the prior task.
2048                         //
2049                         var tester = new TaskContinuationChainLeakTester ();
2050                         tester.Run ();
2051                         tester.TasksPilledUp.WaitOne ();
2052
2053                         // Head task should be out of scope by now.  Manually run the GC and expect that it gets collected.
2054                         //
2055                         GC.Collect ();
2056                         GC.WaitForPendingFinalizers ();
2057
2058                         try {
2059                                 // It's important that we do the asserting while the task recursion is still going, since that is the
2060                                 // crux of the problem scenario.
2061                                 //
2062                                 tester.Verify ();
2063                         } finally {
2064                                 tester.Stop ();
2065                         }
2066                 }
2067
2068                 class TaskContinuationChainLeakTester
2069                 {
2070                         volatile bool m_bStop;
2071                         int counter;
2072                         ManualResetEvent mre = new ManualResetEvent (false);
2073                         WeakReference<Task> headTaskWeakRef;
2074
2075                         public ManualResetEvent TasksPilledUp {
2076                                 get {
2077                                         return mre;
2078                                 }
2079                         }
2080
2081                         public void Run ()
2082                         {
2083                                 headTaskWeakRef = new WeakReference<Task> (StartNewTask ());
2084                         }
2085
2086                         public Task StartNewTask ()
2087                         {
2088                                 if (m_bStop)
2089                                         return null;
2090
2091                                 if (++counter == 50)
2092                                         mre.Set ();
2093
2094                                 return Task.Factory.StartNew (DummyWorker).ContinueWith (task => StartNewTask ());
2095                         }
2096
2097                         public void Stop ()
2098                         {
2099                                 m_bStop = true;
2100                         }
2101
2102                         public void Verify ()
2103                         {
2104                                 Task task;
2105                                 Assert.IsFalse (headTaskWeakRef.TryGetTarget (out task));
2106                         }
2107
2108                         void DummyWorker ()
2109                         {
2110                                 Thread.Sleep (0);
2111                         }
2112                 }
2113
2114         }
2115 }