Merge pull request #167 from konrad-kruczynski/send_async_fix
[mono.git] / mcs / class / corlib / System.Runtime.CompilerServices / AsyncTaskMethodBuilder_T.cs
1 //
2 // AsyncTaskMethodBuilder_T.cs
3 //
4 // Authors:
5 //      Marek Safar  <marek.safar@gmail.com>
6 //
7 // Copyright (C) 2011 Novell, Inc (http://www.novell.com)
8 // Copyright (C) 2011 Xamarin, Inc (http://www.xamarin.com)
9 //
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:
17 //
18 // The above copyright notice and this permission notice shall be
19 // included in all copies or substantial portions of the Software.
20 //
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.
28 //
29
30 #if NET_4_5
31
32 using System.Threading.Tasks;
33
34 namespace System.Runtime.CompilerServices
35 {
36         public struct AsyncTaskMethodBuilder<TResult>
37         {
38                 readonly TaskCompletionSource<TResult> tcs;
39
40                 private AsyncTaskMethodBuilder (TaskCompletionSource<TResult> tcs)
41                 {
42                         this.tcs = tcs;
43                 }
44
45                 public Task<TResult> Task {
46                         get {
47                                 return tcs.Task;
48                         }
49                 }
50                 
51                 public static AsyncTaskMethodBuilder<TResult> Create ()
52                 {
53                         return new AsyncTaskMethodBuilder<TResult> (new TaskCompletionSource<TResult> ());
54                 }
55
56                 public void SetException (Exception exception)
57                 {
58                         if (!tcs.TrySetException (exception))
59                                 throw new InvalidOperationException ("The task has already completed");
60                 }
61
62                 public void SetResult (TResult result)
63                 {
64                         if (!tcs.TrySetResult (result))
65                                 throw new InvalidOperationException ("The task has already completed");
66                 }
67         }
68 }
69
70 #endif