Shuffle & Cleanup Stuff (#3080)

Source/ASRunLoopQueue.h

@@ -0,0 +1,51 @@
+//
+//  ASRunLoopQueue.h
+//  AsyncDisplayKit
+//
+//  Created by Rahul Malik on 3/7/16.
+//
+//  Copyright (c) 2014-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under the BSD-style license found in the
+//  LICENSE file in the root directory of this source tree. An additional grant
+//  of patent rights can be found in the PATENTS file in the same directory.
+//
+
+#import <Foundation/Foundation.h>
+#import <AsyncDisplayKit/ASBaseDefines.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+AS_SUBCLASSING_RESTRICTED
+@interface ASRunLoopQueue<ObjectType> : NSObject
+
+/**
+ * Create a new queue with the given run loop and handler.
+ *
+ * @param runloop The run loop that will drive this queue.
+ * @param handlerBlock An optional block to be run for each enqueued object.
+ *
+ * @discussion You may pass @c nil for the handler if you simply want the objects to
+ * be retained at enqueue time, and released during the run loop step. This is useful
+ * for creating a "main deallocation queue", as @c ASDeallocQueue creates its own 
+ * worker thread with its own run loop.
+ */
+- (instancetype)initWithRunLoop:(CFRunLoopRef)runloop
+                     andHandler:(nullable void(^)(ObjectType dequeuedItem, BOOL isQueueDrained))handlerBlock;
+
+- (void)enqueue:(ObjectType)object;
+
+@property (nonatomic, assign) NSUInteger batchSize;           // Default == 1.
+@property (nonatomic, assign) BOOL ensureExclusiveMembership; // Default == YES.  Set-like behavior.
+
+@end
+
+AS_SUBCLASSING_RESTRICTED
+@interface ASDeallocQueue : NSObject
+
++ (instancetype)sharedDeallocationQueue;
+
+- (void)releaseObjectInBackground:(id)object;
+
+@end
+
+NS_ASSUME_NONNULL_END