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// Copyright 2014 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.
#ifndef Scheduler_h
#define Scheduler_h
#include "platform/PlatformExport.h"
#include "wtf/Functional.h"
#include "wtf/Noncopyable.h"
#include "wtf/PassOwnPtr.h"
namespace blink {
class TraceLocation;
class WebScheduler;
// The scheduler is an opinionated gateway for arranging work to be run on the
// main thread. It decides which tasks get priority over others based on a
// scheduling policy and the overall system state.
class PLATFORM_EXPORT Scheduler {
WTF_MAKE_NONCOPYABLE(Scheduler);
public:
// An IdleTask is passed a deadline in CLOCK_MONOTONIC seconds and is expected to complete before this deadline.
typedef Function<void(double deadlineSeconds)> IdleTask;
static Scheduler* shared();
static void shutdown();
// For non-critical tasks which may be reordered relative to other task types and may be starved
// for an arbitrarily long time if no idle time is available.
void postIdleTask(const TraceLocation&, PassOwnPtr<IdleTask>);
// Returns true if there is high priority work pending on the main thread
// and the caller should yield to let the scheduler service that work.
// Must be called on the main thread.
bool shouldYieldForHighPriorityWork() const;
protected:
Scheduler(WebScheduler*);
virtual ~Scheduler();
static Scheduler* s_sharedScheduler;
WebScheduler* m_webScheduler;
};
} // namespace blink
#endif // Scheduler_h
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