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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_SCHEDULER_BROWSER_UI_THREAD_SCHEDULER_H_
#define CONTENT_BROWSER_SCHEDULER_BROWSER_UI_THREAD_SCHEDULER_H_
#include <memory>
#include "base/memory/raw_ptr.h"
#include "base/task/sequence_manager/task_queue.h"
#include "base/time/time.h"
#include "content/browser/scheduler/browser_task_queues.h"
#include "content/common/content_export.h"
#include "content/common/scheduler_loop_quarantine_task_observer.h"
namespace base {
namespace sequence_manager {
class SequenceManager;
} // namespace sequence_manager
} // namespace base
namespace content {
class BrowserTaskExecutor;
// The BrowserUIThreadScheduler vends TaskQueues and manipulates them to
// implement scheduling policy. This class is never deleted in production.
class CONTENT_EXPORT BrowserUIThreadScheduler {
public:
using Handle = BrowserTaskQueues::Handle;
BrowserUIThreadScheduler();
BrowserUIThreadScheduler(const BrowserUIThreadScheduler&) = delete;
BrowserUIThreadScheduler& operator=(const BrowserUIThreadScheduler&) = delete;
~BrowserUIThreadScheduler();
static BrowserUIThreadScheduler* Get();
// Unlike the default constructor, this assumes a feature list is ready to be
// used. `InstallPartitionAllocSchedulerLoopQuarantineTaskObserver()` is
// called automatically.
static std::unique_ptr<BrowserUIThreadScheduler> CreateForTesting();
// Setting the DefaultTaskRunner is up to the caller.
static std::unique_ptr<BrowserUIThreadScheduler> CreateForTesting(
base::sequence_manager::SequenceManager* sequence_manager);
using QueueType = BrowserTaskQueues::QueueType;
scoped_refptr<Handle> GetHandle() const { return handle_; }
private:
friend class BrowserTaskExecutor;
using QueueEnabledVoter =
base::sequence_manager::TaskQueue::QueueEnabledVoter;
explicit BrowserUIThreadScheduler(
base::sequence_manager::SequenceManager* sequence_manager);
void CommonSequenceManagerSetup(
base::sequence_manager::SequenceManager* sequence_manager);
// Reads a feature list; need to be called after its initialization.
void InstallPartitionAllocSchedulerLoopQuarantineTaskObserver();
void OnTaskCompleted(
const base::sequence_manager::Task& task,
base::sequence_manager::TaskQueue::TaskTiming* task_timing,
base::LazyNow* lazy_now);
// In production the BrowserUIThreadScheduler will own its SequenceManager,
// but in tests it may not.
std::unique_ptr<base::sequence_manager::SequenceManager>
owned_sequence_manager_;
BrowserTaskQueues task_queues_;
SchedulerLoopQuarantineTaskObserver scheduler_loop_quarantine_task_observer_;
scoped_refptr<Handle> handle_;
};
} // namespace content
#endif // CONTENT_BROWSER_SCHEDULER_BROWSER_UI_THREAD_SCHEDULER_H_
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