Back Signal.Core.state with Atomic.

Author: andersio

Sources/Signal.swift

@@ -100,7 +100,12 @@ public final class Signal<Value, Error: Swift.Error> {
 		/// Nevertheless, this should not cause the termination event being
 		/// sent multiple times, since `tryTerminate` would not respond to false
 		/// positives.
-		private var state: State
+		private var state: State {
+			get { return _state.value }
+			set { _state.value = newValue }
+		}
+
+		private let _state: Atomic<State>
 
 		/// Used to ensure that state updates are serialized.
 		private let updateLock: Lock
@@ -112,7 +117,7 @@ public final class Signal<Value, Error: Swift.Error> {
 		private var hasDeinitialized: Bool
 
 		fileprivate init(_ generator: (Observer) -> Disposable?) {
-			state = .alive(AliveState(observers: Bag()))
+			_state = Atomic(.alive(AliveState(observers: Bag())))
 
 			updateLock = Lock.make()
 			sendLock = Lock.make()