
BUG=100054 TEST=no change Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=105401 Reverted: http://src.chromium.org/viewvc/chrome?view=rev&revision=105415 Review URL: http://codereview.chromium.org/8251008 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@105507 0039d316-1c4b-4281-b951-d872f2087c98
56 lines
1.6 KiB
C++
56 lines
1.6 KiB
C++
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef CONTENT_BROWSER_POWER_SAVE_BLOCKER_H_
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#define CONTENT_BROWSER_POWER_SAVE_BLOCKER_H_
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#pragma once
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#include <vector>
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#include "base/basictypes.h"
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// A RAII-style class to block the system from entering low-power (sleep) mode.
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class PowerSaveBlocker {
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public:
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enum PowerSaveBlockerType {
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kPowerSaveBlockPreventNone = -1,
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// Prevent the system from going to sleep; allow display sleep.
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kPowerSaveBlockPreventSystemSleep,
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// Prevent the system or display from going to sleep.
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kPowerSaveBlockPreventDisplaySleep,
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// Count of the values; not valid as a parameter.
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kPowerSaveBlockPreventStateCount
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};
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// Pass in the level of sleep prevention desired. kPowerSaveBlockPreventNone
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// is not a valid option.
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explicit PowerSaveBlocker(PowerSaveBlockerType type);
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~PowerSaveBlocker();
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private:
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// Platform-specific function called when enable state is changed.
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// Guaranteed to be called only from the UI thread.
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static void ApplyBlock(PowerSaveBlockerType type);
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// Called only from UI thread.
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static void AdjustBlockCount(const std::vector<int>& deltas);
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// Invokes AdjustBlockCount on the UI thread.
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static void PostAdjustBlockCount(const std::vector<int>& deltas);
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// Returns the highest-severity block type in use.
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static PowerSaveBlockerType HighestBlockType();
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PowerSaveBlockerType type_;
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static int blocker_count_[];
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DISALLOW_COPY_AND_ASSIGN(PowerSaveBlocker);
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};
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#endif // CONTENT_BROWSER_POWER_SAVE_BLOCKER_H_
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