1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
//
// AsyncTaskMethodBuilder.cs
//
// Authors:
// Marek Safar <marek.safar@gmail.com>
//
// Copyright (C) 2011 Novell, Inc (http://www.novell.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.Threading;
using System.Threading.Tasks;
namespace System.Runtime.CompilerServices
{
public struct AsyncTaskMethodBuilder
{
readonly Task<object> task;
IAsyncStateMachine stateMachine;
private AsyncTaskMethodBuilder (Task<object> task)
{
this.task = task;
this.stateMachine = null;
}
public Task Task {
get {
return task;
}
}
public void AwaitOnCompleted<TAwaiter, TStateMachine> (ref TAwaiter awaiter, ref TStateMachine stateMachine)
where TAwaiter : INotifyCompletion
where TStateMachine : IAsyncStateMachine
{
var action = new Action (stateMachine.MoveNext);
awaiter.OnCompleted (action);
}
public void AwaitUnsafeOnCompleted<TAwaiter, TStateMachine> (ref TAwaiter awaiter, ref TStateMachine stateMachine)
where TAwaiter : ICriticalNotifyCompletion
where TStateMachine : IAsyncStateMachine
{
var action = new Action (stateMachine.MoveNext);
awaiter.UnsafeOnCompleted (action);
}
public static AsyncTaskMethodBuilder Create ()
{
var task = new Task<object> (TaskActionInvoker.Promise, null, CancellationToken.None, TaskCreationOptions.None, null);
task.SetupScheduler (TaskScheduler.Current);
return new AsyncTaskMethodBuilder (task);
}
public void SetException (Exception exception)
{
if (Task.TrySetException (new AggregateException (exception), exception is OperationCanceledException, true))
return;
throw new InvalidOperationException ("The task has already completed");
}
public void SetStateMachine (IAsyncStateMachine stateMachine)
{
if (stateMachine == null)
throw new ArgumentNullException ("stateMachine");
if (this.stateMachine != null)
throw new InvalidOperationException ("The state machine was previously set");
this.stateMachine = stateMachine;
}
public void SetResult ()
{
if (!task.TrySetResult (null))
throw new InvalidOperationException ("The task has already completed");
}
public void Start<TStateMachine> (ref TStateMachine stateMachine) where TStateMachine : IAsyncStateMachine
{
if (stateMachine == null)
throw new ArgumentNullException ("stateMachine");
stateMachine.MoveNext ();
}
}
}
#endif
|
