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78 lines
2.4 KiB
Plaintext
78 lines
2.4 KiB
Plaintext
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/ios/scoped_critical_action.h"
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#import <UIKit/UIKit.h>
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#include "base/logging.h"
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#include "base/memory/ref_counted.h"
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#include "base/synchronization/lock.h"
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namespace base {
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namespace ios {
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ScopedCriticalAction::ScopedCriticalAction()
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: core_(MakeRefCounted<ScopedCriticalAction::Core>()) {
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ScopedCriticalAction::Core::StartBackgroundTask(core_);
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}
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ScopedCriticalAction::~ScopedCriticalAction() {
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ScopedCriticalAction::Core::EndBackgroundTask(core_);
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}
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ScopedCriticalAction::Core::Core()
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: background_task_id_(UIBackgroundTaskInvalid) {}
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ScopedCriticalAction::Core::~Core() {
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DCHECK_EQ(background_task_id_, UIBackgroundTaskInvalid);
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}
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// This implementation calls |beginBackgroundTaskWithExpirationHandler:| when
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// instantiated and |endBackgroundTask:| when destroyed, creating a scope whose
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// execution will continue (temporarily) even after the app is backgrounded.
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// static
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void ScopedCriticalAction::Core::StartBackgroundTask(scoped_refptr<Core> core) {
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UIApplication* application = [UIApplication sharedApplication];
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if (!application) {
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return;
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}
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core->background_task_id_ =
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[application beginBackgroundTaskWithExpirationHandler:^{
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DLOG(WARNING) << "Background task with id " << core->background_task_id_
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<< " expired.";
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// Note if |endBackgroundTask:| is not called for each task before time
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// expires, the system kills the application.
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EndBackgroundTask(core);
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}];
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if (core->background_task_id_ == UIBackgroundTaskInvalid) {
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DLOG(WARNING)
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<< "beginBackgroundTaskWithExpirationHandler: returned an invalid ID";
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} else {
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VLOG(3) << "Beginning background task with id "
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<< core->background_task_id_;
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}
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}
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// static
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void ScopedCriticalAction::Core::EndBackgroundTask(scoped_refptr<Core> core) {
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UIBackgroundTaskIdentifier task_id;
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{
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AutoLock lock_scope(core->background_task_id_lock_);
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if (core->background_task_id_ == UIBackgroundTaskInvalid) {
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return;
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}
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task_id = core->background_task_id_;
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core->background_task_id_ = UIBackgroundTaskInvalid;
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}
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VLOG(3) << "Ending background task with id " << task_id;
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[[UIApplication sharedApplication] endBackgroundTask:task_id];
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}
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} // namespace ios
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} // namespace base
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