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// Copyright 2020 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.
#include "base/task/sequence_manager/thread_controller_power_monitor.h"
#include "base/feature_list.h"
#include "base/power_monitor/power_monitor.h"
#include "base/trace_event/base_tracing.h"
namespace base {
namespace sequence_manager {
namespace internal {
namespace {
// Activate the power management events that affect task scheduling.
const Feature kUsePowerMonitorWithThreadController{
"UsePowerMonitorWithThreadController", FEATURE_DISABLED_BY_DEFAULT};
// TODO(1074332): Remove this when the experiment becomes the default.
bool g_use_thread_controller_power_monitor_ = false;
} // namespace
ThreadControllerPowerMonitor::ThreadControllerPowerMonitor() = default;
ThreadControllerPowerMonitor::~ThreadControllerPowerMonitor() {
PowerMonitor::RemoveObserver(this);
}
void ThreadControllerPowerMonitor::BindToCurrentThread() {
// Occasionally registration happens twice (i.e. when the deprecated
// ThreadController::SetDefaultTaskRunner() re-initializes the
// ThreadController).
if (is_observer_registered_)
PowerMonitor::RemoveObserver(this);
// Register the observer to deliver notifications on the current thread.
PowerMonitor::AddObserver(this);
is_observer_registered_ = true;
}
bool ThreadControllerPowerMonitor::IsProcessInPowerSuspendState() {
return is_power_suspended_;
}
// static
void ThreadControllerPowerMonitor::InitializeOnMainThread() {
DCHECK(!g_use_thread_controller_power_monitor_);
g_use_thread_controller_power_monitor_ =
FeatureList::IsEnabled(kUsePowerMonitorWithThreadController);
}
// static
void ThreadControllerPowerMonitor::OverrideUsePowerMonitorForTesting(
bool use_power_monitor) {
g_use_thread_controller_power_monitor_ = use_power_monitor;
}
// static
void ThreadControllerPowerMonitor::ResetForTesting() {
g_use_thread_controller_power_monitor_ = false;
}
void ThreadControllerPowerMonitor::OnSuspend() {
if (!g_use_thread_controller_power_monitor_)
return;
DCHECK(!is_power_suspended_);
TRACE_EVENT_NESTABLE_ASYNC_BEGIN0("base", "ThreadController::Suspended",
this);
is_power_suspended_ = true;
}
void ThreadControllerPowerMonitor::OnResume() {
if (!g_use_thread_controller_power_monitor_)
return;
// It is possible a suspend was already happening before the observer was
// added to the power monitor. Ignoring the resume notification in that case.
if (is_power_suspended_) {
TRACE_EVENT_NESTABLE_ASYNC_END0("base", "ThreadController::Suspended",
this);
is_power_suspended_ = false;
}
}
} // namespace internal
} // namespace sequence_manager
} // namespace base
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