{"action":"created","comment":{"url":"https://api.github.com/repos/dotnet/roslyn/pulls/comments/115234721","pull_request_review_id":36756805,"id":115234721,"diff_hunk":"@@ -0,0 +1,50 @@\n+﻿// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.\n+\n+using System;\n+using System.Threading;\n+using System.Threading.Tasks;\n+\n+namespace Roslyn.Utilities\n+{\n+    internal static class SemaphoreExtensions\n+    {\n+        public static SemaphoreDisposer DisposableWait(this Semaphore semaphore, CancellationToken cancellationToken = default(CancellationToken))\n+        {\n+            if (cancellationToken.CanBeCanceled)\n+            {\n+                int signalledIndex = WaitHandle.WaitAny(new[] { semaphore, cancellationToken.WaitHandle });\n+                if (signalledIndex != 0)\n+                {\n+                    cancellationToken.ThrowIfCancellationRequested();\n+                    throw ExceptionUtilities.Unreachable;\n+                }\n+            }\n+            else\n+            {\n+                semaphore.WaitOne();\n+            }\n+\n+            return new SemaphoreDisposer(semaphore);\n+        }\n+\n+        public static Task<SemaphoreDisposer> DisposableWaitAsync(this Semaphore semaphore, CancellationToken cancellationToken = default(CancellationToken))","path":"src/Compilers/Core/Portable/InternalUtilities/SemaphoreExtensions.cs","position":30,"original_position":30,"commit_id":"925876268180dba55eb2e083c952553ed84ba764","original_commit_id":"925876268180dba55eb2e083c952553ed84ba764","user":{"login":"sharwell","id":1408396,"avatar_url":"https://avatars2.githubusercontent.com/u/1408396?v=3","gravatar_id":"","url":"https://api.github.com/users/sharwell","html_url":"https://github.com/sharwell","followers_url":"https://api.github.com/users/sharwell/followers","following_url":"https://api.github.com/users/sharwell/following{/other_user}","gists_url":"https://api.github.com/users/sharwell/gists{/gist_id}","starred_url":"https://api.github.com/users/sharwell/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sharwell/subscriptions","organizations_url":"https://api.github.com/users/sharwell/orgs","repos_url":"https://api.github.com/users/sharwell/repos","events_url":"https://api.github.com/users/sharwell/events{/privacy}","received_events_url":"https://api.github.com/users/sharwell/received_events","type":"User","site_admin":false},"body":"@bradwilson How many tests will xUnit be attempting to execute in parallel normally? If that number is close to 1, then the form used here would not cause a problem in our current code base (the only use of `Semaphore` is for this gate).\r\n\r\nIt may be possible to implement `DisposableWaitAsync` without holding a thread, but it's non-trivial to get it right with `Semaphore`. I preferred this to the alternative to placing a blocking wait inside of an unrelated `async` method.","created_at":"2017-05-08T12:23:04Z","updated_at":"2017-05-08T12:23:04Z","html_url":"https://github.com/dotnet/roslyn/pull/18302#discussion_r115234721","pull_request_url":"https://api.github.com/repos/dotnet/roslyn/pulls/18302","_links":{"self":{"href":"https://api.github.com/repos/dotnet/roslyn/pulls/comments/115234721"},"html":{"href":"https://github.com/dotnet/roslyn/pull/18302#discussion_r115234721"},"pull_request":{"href":"https://api.github.com/repos/dotnet/roslyn/pulls/18302"}}},"pull_request":{"url":"https://api.github.com/repos/dotnet/roslyn/pulls/18302","id":113309723,"html_url":"https://github.com/dotnet/roslyn/pull/18302","diff_url":"https://github.com/dotnet/roslyn/pull/18302.diff","patch_url":"https://github.com/dotnet/roslyn/pull/18302.patch","issue_url":"https://api.github.com/repos/dotnet/roslyn/issues/18302","number":18302,"state":"open","locked":false,"title":"Allow WpfFact tests to run from Test Explorer","user":{"login":"sharwell","id":1408396,"avatar_url":"https://avatars2.githubusercontent.com/u/1408396?v=3","gravatar_id":"","url":"https://api.github.com/users/sharwell","html_url":"https://github.com/sharwell","followers_url":"https://api.github.com/users/sharwell/followers","following_url":"https://api.github.com/users/sharwell/following{/other_user}","gists_url":"https://api.github.com/users/sharwell/gists{/gist_id}","starred_url":"https://api.github.com/users/sharwell/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sharwell/subscriptions","organizations_url":"https://api.github.com/users/sharwell/orgs","repos_url":"https://api.github.com/users/sharwell/repos","events_url":"https://api.github.com/users/sharwell/events{/privacy}","received_events_url":"https://api.github.com/users/sharwell/received_events","type":"User","site_admin":false},"body":"This commit adds the necessary deserialization constructor which allows\r\nWpfFact tests to be run from Test Explorer in Visual Studio. 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