Imported Upstream version 5.18.0.142

Former-commit-id: 7467d4b717762eeaf652d77f1486dd11ffb1ff1f

mcs/class/System/Mono/SystemDependencyProvider.cs

@@ -0,0 +1,69 @@
+//
+// SystemDependencyProvider.cs
+//
+// Author:
+//       Martin Baulig <mabaul@microsoft.com>
+//
+// Copyright (c) 2018 Xamarin, Inc.
+//
+// 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.
+using System;
+using System.Threading;
+
+namespace Mono
+{
+	/*
+	 * The purpose of this class is to allow code in `corlib.dll` to access `System.dll` APIs.
+	 */
+	class SystemDependencyProvider : ISystemDependencyProvider
+	{
+		static SystemDependencyProvider instance;
+
+		public static SystemDependencyProvider Instance {
+			get {
+				Initialize ();
+				return instance;
+			}
+		}
+
+		internal static void Initialize ()
+		{
+			if (instance == null)
+				Interlocked.CompareExchange (ref instance, new SystemDependencyProvider (), null);
+		}
+
+		ISystemCertificateProvider ISystemDependencyProvider.CertificateProvider => CertificateProvider;
+
+		public SystemCertificateProvider CertificateProvider {
+			get;
+		}
+
+		public X509PalImpl X509Pal => CertificateProvider.X509Pal;
+
+		SystemDependencyProvider ()
+		{
+			CertificateProvider = new SystemCertificateProvider ();
+
+			/*
+			 * Register ourselves with corlib's `DependencyInjector`.
+			 */
+			DependencyInjector.Register (this);
+		}
+	}
+}