Cleanup netfx-specific code from projects that no longer build in netfx configuration...

* Remove Crc32Helper.Managed.cs and '$(TargetGroup)' == 'netfx' conditionals from System.IO.Compression.csproj

* Remove netfx conditionals from System.Data.Common.csproj

* Remove netfx conditionals from System.Diagnostics.StackTrace.csproj

* Remove 'netfx' and 'net46' conditionals from System.Net.Http.csproj

* Remove 'netfx' conditionals from System.Net.Sockets.csproj

* Remove 'netfx', 'net462' and 'net47' conditionals from System.Runtime.InteropServices.RuntimeInformation.csproj

* Remove 'netfx' conditionals from System.Runtime.Serialization.Primitives.csproj

* Remove 'netfx' conditionals from System.Runtime.Serialization.Xml.csproj

* Remove 'netfx' and 'net47' conditionals from System.Security.Cryptography.Algorithms.csproj

* Remove 'netfx' conditionals from System.Security.SecureString.csproj

* Remove 'netfx' conditionals from System.Threading.Overlapped.csproj

* Remove 'netfx' conditionals from System.Xml.XPath.XDocument.csproj

* Trim out unused source file DeferredDisposableLifetime.cs

Signed-off-by: dotnet-bot <dotnet-bot@microsoft.com>
Commit migrated from https://github.com/dotnet/coreclr/commit/809169e85b34484a347c2858f41ce72ccb02ac18

diff --git a/src/libraries/System.Private.CoreLib/src/System/Threading/DeferredDisposableLifetime.cs b/src/libraries/System.Private.CoreLib/src/System/Threading/DeferredDisposableLifetime.cs
deleted file mode 100644 (file)
index e2b1eb9..0000000
--- a/src/libraries/System.Private.CoreLib/src/System/Threading/DeferredDisposableLifetime.cs
+++ /dev/null
@@ -1,116 +0,0 @@
-// 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.Diagnostics;
-
-namespace System.Threading
-{
-    /// <summary>
-    /// Provides callbacks to objects whose lifetime is managed by <see cref="DeferredDisposableLifetime{T}"/>.
-    /// </summary>
-    internal interface IDeferredDisposable
-    {
-        /// <summary>
-        /// Called when the object's refcount reaches zero.
-        /// </summary>
-        /// <param name="disposed">
-        /// Indicates whether the object has been disposed.
-        /// </param>
-        /// <remarks>
-        /// If the refcount reaches zero before the object is disposed, this method will be called with
-        /// <paramref name="disposed"/> set to false.  If the object is then disposed, this method will be
-        /// called again, with <paramref name="disposed"/> set to true.  If the refcount reaches zero
-        /// after the object has already been disposed, this will be called a single time, with 
-        /// <paramref name="disposed"/> set to true.
-        /// </remarks>
-        void OnFinalRelease(bool disposed);
-    }
-
-    /// <summary>
-    /// Manages the lifetime of an object which implements IDisposable, but which must defer the actual
-    /// cleanup of state until all existing uses of the object are complete.
-    /// </summary>
-    /// <typeparam name="T">The type of object whose lifetime will be managed.</typeparam>
-    /// <remarks>
-    /// This type maintains a reference count, and tracks whether the object has been disposed.  When
-    /// Callbacks are made to <see cref="IDeferredDisposable.OnFinalRelease(bool)"/> when the refcount
-    /// reaches zero.  Objects that need to defer cleanup until they have been disposed *and* they have
-    /// no more references can do so in <see cref="IDeferredDisposable.OnFinalRelease(bool)"/> when
-    /// 'disposed' is true.
-    /// </remarks>
-    internal struct DeferredDisposableLifetime<T> where T : class, IDeferredDisposable
-    {
-        //
-        // _count is positive until Dispose is called, after which it's (-1 - refcount).
-        //
-        private int _count;
-
-        public bool AddRef(T obj)
-        {
-            while (true)
-            {
-                int oldCount = Volatile.Read(ref _count);
-
-                // Have we been disposed?
-                if (oldCount < 0)
-                    throw new ObjectDisposedException(typeof(T).ToString());
-
-                int newCount = checked(oldCount + 1);
-
-                if (Interlocked.CompareExchange(ref _count, newCount, oldCount) == oldCount)
-                    return true;
-            }
-        }
-
-        public void Release(T obj)
-        {
-            while (true)
-            {
-                int oldCount = Volatile.Read(ref _count);
-                if (oldCount > 0)
-                {
-                    // We haven't been disposed.  Decrement _count.
-                    int newCount = oldCount - 1;
-                    if (Interlocked.CompareExchange(ref _count, newCount, oldCount) == oldCount)
-                    {
-                        if (newCount == 0)
-                            obj.OnFinalRelease(disposed: false);
-                        return;
-                    }
-                }
-                else
-                {
-                    Debug.Assert(oldCount != 0 && oldCount != -1);
-
-                    // We've been disposed.  Increment _count.
-                    int newCount = oldCount + 1;
-                    if (Interlocked.CompareExchange(ref _count, newCount, oldCount) == oldCount)
-                    {
-                        if (newCount == -1)
-                            obj.OnFinalRelease(disposed: true);
-                        return;
-                    }
-                }
-            }
-        }
-
-        public void Dispose(T obj)
-        {
-            while (true)
-            {
-                int oldCount = Volatile.Read(ref _count);
-                if (oldCount < 0)
-                    return; // already disposed
-
-                int newCount = -1 - oldCount;
-                if (Interlocked.CompareExchange(ref _count, newCount, oldCount) == oldCount)
-                {
-                    if (newCount == -1)
-                        obj.OnFinalRelease(disposed: true);
-                    return;
-                }
-            }
-        }
-    }
-}