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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.
#ifndef CHROME_BROWSER_CHROMEOS_LOW_MEMORY_OBSERVER_H_
#define CHROME_BROWSER_CHROMEOS_LOW_MEMORY_OBSERVER_H_
#include "base/memory/ref_counted.h"
namespace chromeos {
class LowMemoryObserverImpl;
////////////////////////////////////////////////////////////////////////////////
// LowMemoryObserver
//
// Class to handle observation of low memory device for changes so that we
// can get a signal from the kernel about low memory conditions and discard tabs
// when that happens, instead of waiting for the OOM killer to kill renderers
// (which is more drastic, but still necessary and possible).
//
// This object starts and stops the observation, and can be created or deleted
// from any thread, but the observation occurs on the FILE thread, and tabs are
// discarded on the UI thread.
class LowMemoryObserver {
public:
LowMemoryObserver();
~LowMemoryObserver();
void Start();
void Stop();
// Sets the threshold level of the low memory notifier in megabytes. Setting
// to -1 will turn off the low memory notifier.
static void SetLowMemoryMargin(int64 margin_mb);
private:
scoped_refptr<LowMemoryObserverImpl> observer_;
DISALLOW_COPY_AND_ASSIGN(LowMemoryObserver);
};
} // namespace chromeos
#endif // CHROME_BROWSER_CHROMEOS_LOW_MEMORY_OBSERVER_H_
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