Move solution and projects to src

src/Ryujinx.Common/ReactiveObject.cs

@@ -0,0 +1,61 @@
+using System;
+using System.Threading;
+
+namespace Ryujinx.Common
+{
+    public class ReactiveObject<T>
+    {
+        private ReaderWriterLock _readerWriterLock = new ReaderWriterLock();
+        private bool _isInitialized = false;
+        private T _value;
+
+        public event EventHandler<ReactiveEventArgs<T>> Event;
+
+        public T Value
+        {
+            get
+            {
+                _readerWriterLock.AcquireReaderLock(Timeout.Infinite);
+                T value = _value;
+                _readerWriterLock.ReleaseReaderLock();
+
+                return value;
+            }
+            set
+            {
+                _readerWriterLock.AcquireWriterLock(Timeout.Infinite);
+
+                T oldValue = _value;
+
+                bool oldIsInitialized = _isInitialized;
+
+                _isInitialized = true;
+                _value         = value;
+
+                _readerWriterLock.ReleaseWriterLock();
+
+                if (!oldIsInitialized || oldValue == null || !oldValue.Equals(_value))
+                {
+                    Event?.Invoke(this, new ReactiveEventArgs<T>(oldValue, value));
+                }
+            }
+        }
+
+        public static implicit operator T(ReactiveObject<T> obj)
+        {
+            return obj.Value;
+        }
+    }
+
+    public class ReactiveEventArgs<T>
+    {
+        public T OldValue { get; }
+        public T NewValue { get; }
+
+        public ReactiveEventArgs(T oldValue, T newValue)
+        {
+            OldValue = oldValue;
+            NewValue = newValue;
+        }
+    }
+}