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Implement IAsyncDisposable.ConfigureAwait (dotnet/coreclr#22160)

Signed-off-by: dotnet-bot <dotnet-bot@microsoft.com>
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stephentoub authored and jkotas committed Jan 24, 2019
1 parent d40bfe3 commit 351ca391579740ae8af8a5405cffa16d152ad6b2
@@ -511,6 +511,7 @@
<Compile Include="$(MSBuildThisFileDirectory)System\Runtime\CompilerServices\CompilationRelaxationsAttribute.cs" />
<Compile Include="$(MSBuildThisFileDirectory)System\Runtime\CompilerServices\CompilerGeneratedAttribute.cs" />
<Compile Include="$(MSBuildThisFileDirectory)System\Runtime\CompilerServices\CompilerGlobalScopeAttribute.cs" />
<Compile Include="$(MSBuildThisFileDirectory)System\Runtime\CompilerServices\ConfiguredAsyncDisposable.cs" />
<Compile Include="$(MSBuildThisFileDirectory)System\Runtime\CompilerServices\ConfiguredCancelableAsyncEnumerable.cs" />
<Compile Include="$(MSBuildThisFileDirectory)System\Runtime\CompilerServices\ConfiguredValueTaskAwaitable.cs" />
<Compile Include="$(MSBuildThisFileDirectory)System\Runtime\CompilerServices\ContractHelper.cs" />
@@ -0,0 +1,27 @@
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System.Runtime.InteropServices;

namespace System.Runtime.CompilerServices
{
/// <summary>Provides a type that can be used to configure how awaits on an <see cref="IAsyncDisposable"/> are performed.</summary>
[StructLayout(LayoutKind.Auto)]
public readonly struct ConfiguredAsyncDisposable
{
private readonly IAsyncDisposable _source;
private readonly bool _continueOnCapturedContext;

internal ConfiguredAsyncDisposable(IAsyncDisposable source, bool continueOnCapturedContext)
{
_source = source;
_continueOnCapturedContext = continueOnCapturedContext;
}

public ConfiguredValueTaskAwaitable DisposeAsync() =>
// as with other "configured" awaitable-related type in CompilerServices, we don't null check to defend against
// misuse like `default(ConfiguredAsyncDisposable).DisposeAsync()`, which will null ref by design.
_source.DisposeAsync().ConfigureAwait(_continueOnCapturedContext);
}
}
@@ -48,6 +48,13 @@ public static Task<TResult> Unwrap<TResult>(this Task<Task<TResult>> task)
Task.FromCanceled<TResult>(new CancellationToken(true));
}

/// <summary>Configures how awaits on the tasks returned from an async disposable will be performed.</summary>
/// <param name="source">The source async disposable.</param>
/// <param name="continueOnCapturedContext">Whether to capture and marshal back to the current context.</param>
/// <returns>The configured async disposable.</returns>
public static ConfiguredAsyncDisposable ConfigureAwait(this IAsyncDisposable source, bool continueOnCapturedContext) =>
new ConfiguredAsyncDisposable(source, continueOnCapturedContext);

/// <summary>Configures how awaits on the tasks returned from an async iteration will be performed.</summary>
/// <typeparam name="T">The type of the objects being iterated.</typeparam>
/// <param name="source">The source enumerable being iterated.</param>

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