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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/ios/scoped_critical_action.h"
#import <UIKit/UIKit.h>
#include <float.h>
#include "base/ios/ios_util.h"
#include "base/logging.h"
#include "base/memory/ref_counted.h"
#include "base/metrics/histogram_macros.h"
#include "base/metrics/user_metrics.h"
#include "base/strings/sys_string_conversions.h"
#include "base/synchronization/lock.h"
namespace base {
namespace ios {
ScopedCriticalAction::ScopedCriticalAction(StringPiece task_name)
: core_(MakeRefCounted<ScopedCriticalAction::Core>()) {
ScopedCriticalAction::Core::StartBackgroundTask(core_, task_name);
}
ScopedCriticalAction::~ScopedCriticalAction() {
ScopedCriticalAction::Core::EndBackgroundTask(core_);
}
ScopedCriticalAction::Core::Core()
: background_task_id_(UIBackgroundTaskInvalid) {}
ScopedCriticalAction::Core::~Core() {
DCHECK_EQ(background_task_id_, UIBackgroundTaskInvalid);
}
// This implementation calls |beginBackgroundTaskWithName:expirationHandler:|
// when instantiated and |endBackgroundTask:| when destroyed, creating a scope
// whose execution will continue (temporarily) even after the app is
// backgrounded.
// static
void ScopedCriticalAction::Core::StartBackgroundTask(scoped_refptr<Core> core,
StringPiece task_name) {
UIApplication* application = [UIApplication sharedApplication];
if (!application) {
return;
}
AutoLock lock_scope(core->background_task_id_lock_);
NSString* task_string =
!task_name.empty() ? base::SysUTF8ToNSString(task_name) : nil;
core->background_task_id_ = [application
beginBackgroundTaskWithName:task_string
expirationHandler:^{
DLOG(WARNING)
<< "Background task with name <"
<< base::SysNSStringToUTF8(task_string) << "> and with "
<< "id " << core->background_task_id_ << " expired.";
// Note if |endBackgroundTask:| is not called for each task
// before time expires, the system kills the application.
EndBackgroundTask(core);
}];
if (core->background_task_id_ == UIBackgroundTaskInvalid) {
DLOG(WARNING) << "beginBackgroundTaskWithName:<" << task_name << "> "
<< "expirationHandler: returned an invalid ID";
} else {
VLOG(3) << "Beginning background task <" << task_name << "> with id "
<< core->background_task_id_;
}
}
// static
void ScopedCriticalAction::Core::EndBackgroundTask(scoped_refptr<Core> core) {
UIBackgroundTaskIdentifier task_id;
{
AutoLock lock_scope(core->background_task_id_lock_);
if (core->background_task_id_ == UIBackgroundTaskInvalid) {
return;
}
task_id = core->background_task_id_;
core->background_task_id_ = UIBackgroundTaskInvalid;
}
VLOG(3) << "Ending background task with id " << task_id;
[[UIApplication sharedApplication] endBackgroundTask:task_id];
}
} // namespace ios
} // namespace base
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