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92ea95e34a
In https://webrtc-review.googlesource.com/c/src/+/1560 we moved WebRTC from src/webrtc to src/ (in order to preserve an healthy git history). This CL takes care of fixing header guards, #include paths, etc... NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true TBR=tommi@webrtc.org Bug: chromium:611808 Change-Id: Iea91618212bee0af16aa3f05071eab8f93706578 Reviewed-on: https://webrtc-review.googlesource.com/1561 Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Henrik Kjellander <kjellander@webrtc.org> Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Cr-Commit-Position: refs/heads/master@{#19846}
114 lines
3.9 KiB
Objective-C
114 lines
3.9 KiB
Objective-C
/*
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* Copyright 2016 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "RTCUIApplicationStatusObserver.h"
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#if defined(WEBRTC_IOS)
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#import <UIKit/UIKit.h>
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#include "rtc_base/checks.h"
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@interface RTCUIApplicationStatusObserver ()
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@property(nonatomic, assign) BOOL initialized;
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@property(nonatomic, assign) UIApplicationState state;
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@end
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@implementation RTCUIApplicationStatusObserver {
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BOOL _initialized;
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dispatch_block_t _initializeBlock;
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dispatch_semaphore_t _waitForInitializeSemaphore;
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UIApplicationState _state;
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id<NSObject> _activeObserver;
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id<NSObject> _backgroundObserver;
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}
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@synthesize initialized = _initialized;
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@synthesize state = _state;
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+ (instancetype)sharedInstance {
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static id sharedInstance;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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sharedInstance = [[self alloc] init];
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});
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return sharedInstance;
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}
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// Method to make sure observers are added and the initialization block is
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// scheduled to run on the main queue.
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+ (void)prepareForUse {
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__unused RTCUIApplicationStatusObserver *observer = [self sharedInstance];
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}
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- (id)init {
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if (self = [super init]) {
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NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
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__weak RTCUIApplicationStatusObserver *weakSelf = self;
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_activeObserver = [center addObserverForName:UIApplicationDidBecomeActiveNotification
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object:nil
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queue:[NSOperationQueue mainQueue]
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usingBlock:^(NSNotification *note) {
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weakSelf.state =
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[UIApplication sharedApplication].applicationState;
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}];
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_backgroundObserver = [center addObserverForName:UIApplicationDidEnterBackgroundNotification
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object:nil
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queue:[NSOperationQueue mainQueue]
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usingBlock:^(NSNotification *note) {
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weakSelf.state =
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[UIApplication sharedApplication].applicationState;
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}];
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_waitForInitializeSemaphore = dispatch_semaphore_create(1);
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_initialized = NO;
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_initializeBlock = dispatch_block_create(DISPATCH_BLOCK_INHERIT_QOS_CLASS, ^{
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weakSelf.state = [UIApplication sharedApplication].applicationState;
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weakSelf.initialized = YES;
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});
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dispatch_async(dispatch_get_main_queue(), _initializeBlock);
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}
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return self;
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}
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- (void)dealloc {
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NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
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[center removeObserver:_activeObserver];
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[center removeObserver:_backgroundObserver];
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}
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- (BOOL)isApplicationActive {
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// NOTE: The function `dispatch_block_wait` can only legally be called once.
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// Because of this, if several threads call the `isApplicationActive` method before
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// the `_initializeBlock` has been executed, instead of multiple threads calling
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// `dispatch_block_wait`, the other threads need to wait for the first waiting thread
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// instead.
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if (!_initialized) {
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dispatch_semaphore_wait(_waitForInitializeSemaphore, DISPATCH_TIME_FOREVER);
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if (!_initialized) {
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long ret = dispatch_block_wait(_initializeBlock,
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dispatch_time(DISPATCH_TIME_NOW, 10.0 * NSEC_PER_SEC));
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RTC_DCHECK_EQ(ret, 0);
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}
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dispatch_semaphore_signal(_waitForInitializeSemaphore);
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}
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return _state == UIApplicationStateActive;
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}
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@end
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#endif // WEBRTC_IOS
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