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// Copyright (c) 2009 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_POWER_SAVE_BLOCKER_H_
#define CHROME_BROWSER_POWER_SAVE_BLOCKER_H_
#pragma once
#include "base/basictypes.h"
// A RAII-style class to block the system from entering low-power
// (sleep) mode.
class PowerSaveBlocker {
public:
explicit PowerSaveBlocker(bool enabled);
~PowerSaveBlocker();
bool enabled() const { return enabled_; }
// Puts the sleep mode block into effect.
void Enable();
// Disables the sleep block.
void Disable();
private:
// Platform-specific function called when enable state is changed.
// Guarenteed to be called only from the UI thread.
static void ApplyBlock(bool blocked);
// Called only from UI thread.
static void AdjustBlockCount(int delta);
// Invokes AdjustBlockCount on the UI thread.
static void PostAdjustBlockCount(int delta);
bool enabled_;
static int blocker_count_;
DISALLOW_COPY_AND_ASSIGN(PowerSaveBlocker);
};
#endif // CHROME_BROWSER_POWER_SAVE_BLOCKER_H_
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