2 // AsyncVoidMethodBuilder.cs
5 // Marek Safar <marek.safar@gmail.com>
7 // Copyright (C) 2011 Novell, Inc (http://www.novell.com)
8 // Copyright (C) 2011 Xamarin, Inc (http://www.xamarin.com)
10 // Permission is hereby granted, free of charge, to any person obtaining
11 // a copy of this software and associated documentation files (the
12 // "Software"), to deal in the Software without restriction, including
13 // without limitation the rights to use, copy, modify, merge, publish,
14 // distribute, sublicense, and/or sell copies of the Software, and to
15 // permit persons to whom the Software is furnished to do so, subject to
16 // the following conditions:
18 // The above copyright notice and this permission notice shall be
19 // included in all copies or substantial portions of the Software.
21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
32 using System.Threading;
34 namespace System.Runtime.CompilerServices
36 public struct AsyncVoidMethodBuilder
38 static readonly SynchronizationContext null_context = new SynchronizationContext ();
40 readonly SynchronizationContext context;
41 IAsyncStateMachine stateMachine;
43 private AsyncVoidMethodBuilder (SynchronizationContext context)
45 this.context = context;
46 this.stateMachine = null;
49 public void AwaitOnCompleted<TAwaiter, TStateMachine> (ref TAwaiter awaiter, ref TStateMachine stateMachine)
50 where TAwaiter : INotifyCompletion
51 where TStateMachine : IAsyncStateMachine
53 var action = new Action (stateMachine.MoveNext);
54 awaiter.OnCompleted (action);
57 public void AwaitUnsafeOnCompleted<TAwaiter, TStateMachine> (ref TAwaiter awaiter, ref TStateMachine stateMachine)
58 where TAwaiter : ICriticalNotifyCompletion
59 where TStateMachine : IAsyncStateMachine
61 var action = new Action (stateMachine.MoveNext);
62 awaiter.UnsafeOnCompleted (action);
65 public static AsyncVoidMethodBuilder Create ()
67 var ctx = SynchronizationContext.Current ?? null_context;
68 ctx.OperationStarted ();
70 return new AsyncVoidMethodBuilder (ctx);
73 public void SetException (Exception exception)
75 if (exception == null)
76 throw new ArgumentNullException ("exception");
79 context.Post (l => { throw (Exception) l; }, exception);
85 public void SetStateMachine (IAsyncStateMachine stateMachine)
87 if (stateMachine == null)
88 throw new ArgumentNullException ("stateMachine");
90 if (this.stateMachine != null)
91 throw new InvalidOperationException ("The state machine was previously set");
93 this.stateMachine = stateMachine;
96 public void SetResult ()
98 context.OperationCompleted ();
101 public void Start<TStateMachine> (ref TStateMachine stateMachine) where TStateMachine : IAsyncStateMachine
103 if (stateMachine == null)
104 throw new ArgumentNullException ("stateMachine");
106 stateMachine.MoveNext ();