mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-12-01 01:36:09 +03:00
71 lines
2.3 KiB
C
71 lines
2.3 KiB
C
|
// Copyright 2013 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 BASE_POWER_MONITOR_POWER_MONITOR_SOURCE_H_
|
||
|
|
#define BASE_POWER_MONITOR_POWER_MONITOR_SOURCE_H_
|
||
|
|
|
||
|
|
#include "base/base_export.h"
|
||
|
|
#include "base/macros.h"
|
||
|
|
#include "base/memory/ref_counted.h"
|
||
|
|
#include "base/observer_list_threadsafe.h"
|
||
|
|
#include "base/synchronization/lock.h"
|
||
|
|
|
||
|
|
namespace base {
|
||
|
|
|
||
|
|
class PowerMonitor;
|
||
|
|
|
||
|
|
// Communicates power state changes to the power monitor.
|
||
|
|
class BASE_EXPORT PowerMonitorSource {
|
||
|
|
public:
|
||
|
|
PowerMonitorSource();
|
||
|
|
virtual ~PowerMonitorSource();
|
||
|
|
|
||
|
|
// Normalized list of power events.
|
||
|
|
enum PowerEvent {
|
||
|
|
POWER_STATE_EVENT, // The Power status of the system has changed.
|
||
|
|
SUSPEND_EVENT, // The system is being suspended.
|
||
|
|
RESUME_EVENT // The system is being resumed.
|
||
|
|
};
|
||
|
|
|
||
|
|
// Is the computer currently on battery power. Can be called on any thread.
|
||
|
|
bool IsOnBatteryPower();
|
||
|
|
|
||
|
|
protected:
|
||
|
|
friend class PowerMonitorTest;
|
||
|
|
|
||
|
|
// Friend function that is allowed to access the protected ProcessPowerEvent.
|
||
|
|
friend void ProcessPowerEventHelper(PowerEvent);
|
||
|
|
|
||
|
|
// Get the process-wide PowerMonitorSource (if not present, returns NULL).
|
||
|
|
static PowerMonitorSource* Get();
|
||
|
|
|
||
|
|
// ProcessPowerEvent should only be called from a single thread, most likely
|
||
|
|
// the UI thread or, in child processes, the IO thread.
|
||
|
|
static void ProcessPowerEvent(PowerEvent event_id);
|
||
|
|
|
||
|
|
// Platform-specific method to check whether the system is currently
|
||
|
|
// running on battery power. Returns true if running on batteries,
|
||
|
|
// false otherwise.
|
||
|
|
virtual bool IsOnBatteryPowerImpl() = 0;
|
||
|
|
|
||
|
|
// Sets the initial state for |on_battery_power_|, which defaults to false
|
||
|
|
// since not all implementations can provide the value at construction. May
|
||
|
|
// only be called before a base::PowerMonitor has been created.
|
||
|
|
void SetInitialOnBatteryPowerState(bool on_battery_power);
|
||
|
|
|
||
|
|
private:
|
||
|
|
bool on_battery_power_ = false;
|
||
|
|
bool suspended_ = false;
|
||
|
|
|
||
|
|
// This lock guards access to on_battery_power_, to ensure that
|
||
|
|
// IsOnBatteryPower can be called from any thread.
|
||
|
|
Lock battery_lock_;
|
||
|
|
|
||
|
|
DISALLOW_COPY_AND_ASSIGN(PowerMonitorSource);
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace base
|
||
|
|
|
||
|
|
#endif // BASE_POWER_MONITOR_POWER_MONITOR_SOURCE_H_
|