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ASSentinel.h
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28 lines (23 loc) · 780 Bytes
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/* 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>
/**
@summary We want to avoid capturing layer instances on a background queue, but we want a way to cancel rendering
immediately if another display pass begins. ASSentinel is owned by the layer and passed to the background
block.
*/
@interface ASSentinel : NSObject
/**
Returns the current value of the sentinel.
*/
- (int32_t)value;
/**
Atomically increments the value and returns the new value.
*/
- (int32_t)increment;
@end