1/* 2 * Copyright (C) 2014 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' 14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS 17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 23 * THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#import "config.h" 27#import "WebMemoryPressureHandlerIOS.h" 28 29#if PLATFORM(IOS) 30 31#import "ViewSnapshotStore.h" 32#import <dispatch/private.h> 33 34namespace WebKit { 35 36WebMemoryPressureHandler& WebMemoryPressureHandler::shared() 37{ 38 static NeverDestroyed<WebMemoryPressureHandler> memoryPressureHandler; 39 return memoryPressureHandler; 40} 41 42WebMemoryPressureHandler::WebMemoryPressureHandler() 43{ 44 // FIXME: This should be able to share code with WebCore's MemoryPressureHandler (and be platform independent). 45 // Right now it cannot because WebKit1 and WebKit2 need to be able to coexist in the UI process, 46 // and you can only have one WebCore::MemoryPressureHandler. 47 48 dispatch_source_t source = dispatch_source_create(DISPATCH_SOURCE_TYPE_MEMORYSTATUS, 0, DISPATCH_MEMORYSTATUS_PRESSURE_WARN, dispatch_get_main_queue()); 49 dispatch_set_context(source, this); 50 dispatch_source_set_event_handler(source, ^{ 51 ViewSnapshotStore::shared().discardSnapshotImages(); 52 }); 53 dispatch_resume(source); 54} 55 56} // namespace WebKit 57 58#endif 59