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//
// TaskAwaiterTest.cs
//
// Authors:
// Marek Safar <marek.safar@gmail.com>
//
// Copyright (C) 2011 Xamarin, Inc (http://www.xamarin.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
#if NET_4_5
using System;
using System.Threading;
using System.Threading.Tasks;
using NUnit.Framework;
using System.Runtime.CompilerServices;
using System.Collections.Generic;
namespace MonoTests.System.Runtime.CompilerServices
{
[TestFixture]
public class TaskAwaiterTest
{
class Scheduler : TaskScheduler
{
string name;
public Scheduler (string name)
{
this.name = name;
}
public int InlineCalls { get; set; }
public int QueueCalls { get; set; }
protected override IEnumerable<Task> GetScheduledTasks ()
{
throw new NotImplementedException ();
}
protected override void QueueTask (Task task)
{
++QueueCalls;
ThreadPool.QueueUserWorkItem (o => {
TryExecuteTask (task);
});
}
protected override bool TryExecuteTaskInline (Task task, bool taskWasPreviouslyQueued)
{
++InlineCalls;
return false;
}
}
[Test]
public void GetResultFaulted ()
{
TaskAwaiter awaiter;
var task = new Task (() => { throw new ApplicationException (); });
awaiter = task.GetAwaiter ();
task.RunSynchronously (TaskScheduler.Current);
Assert.IsTrue (awaiter.IsCompleted);
try {
awaiter.GetResult ();
Assert.Fail ();
} catch (ApplicationException) {
}
}
[Test]
public void GetResultCanceled ()
{
TaskAwaiter awaiter;
var token = new CancellationToken (true);
var task = new Task (() => { }, token);
awaiter = task.GetAwaiter ();
try {
awaiter.GetResult ();
Assert.Fail ();
} catch (TaskCanceledException) {
}
}
[Test]
public void GetResultWaitOnCompletion ()
{
TaskAwaiter awaiter;
var task = Task.Delay (30);
awaiter = task.GetAwaiter ();
awaiter.GetResult ();
Assert.AreEqual (TaskStatus.RanToCompletion, task.Status);
}
[Test]
public void CustomScheduler ()
{
// some test runners (e.g. Touch.Unit) will execute this on the main thread and that would lock them
if (!Thread.CurrentThread.IsBackground)
return;
var a = new Scheduler ("a");
var b = new Scheduler ("b");
var t = TestCS (a, b);
Assert.IsTrue (t.Wait (3000), "#0");
Assert.AreEqual (0, t.Result, "#1");
Assert.AreEqual (1, a.InlineCalls, "#2a");
Assert.AreEqual (0, b.InlineCalls, "#2b");
Assert.AreEqual (2, a.QueueCalls, "#3a");
Assert.AreEqual (1, b.QueueCalls, "#3b");
}
static async Task<int> TestCS (TaskScheduler schedulerA, TaskScheduler schedulerB)
{
var res = await Task.Factory.StartNew (async () => {
if (TaskScheduler.Current != schedulerA)
return 1;
await Task.Factory.StartNew (
() => {
if (TaskScheduler.Current != schedulerB)
return 2;
return 0;
}, CancellationToken.None, TaskCreationOptions.None, schedulerB);
if (TaskScheduler.Current != schedulerA)
return 3;
return 0;
}, CancellationToken.None, TaskCreationOptions.None, schedulerA);
return res.Result;
}
[Test]
public void FinishedTaskOnCompleted ()
{
var mres = new ManualResetEvent (false);
var mres2 = new ManualResetEvent (false);
var tcs = new TaskCompletionSource<object> ();
tcs.SetResult (null);
var task = tcs.Task;
var awaiter = task.GetAwaiter ();
Assert.IsTrue (awaiter.IsCompleted, "#1");
awaiter.OnCompleted(() => {
if (mres.WaitOne (1000))
mres2.Set ();
});
mres.Set ();
// this will only terminate correctly if the test was not executed from the main thread
// e.g. Touch.Unit defaults to run tests on the main thread and this will return false
Assert.AreEqual (Thread.CurrentThread.IsBackground, mres2.WaitOne (2000), "#2");;
}
}
}
#endif
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