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// Copyright 2014 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 "chrome/browser/chromeos/power/renderer_freezer.h"
#include <cstring> // needed for strlen()
#include "base/files/file_util.h"
#include "base/logging.h"
#include "chromeos/dbus/dbus_thread_manager.h"
namespace chromeos {
namespace {
const char kFreezerStatePath[] =
"/sys/fs/cgroup/freezer/chrome_renderers/freezer.state";
const char kFreezeCommand[] = "FROZEN";
const char kThawCommand[] = "THAWED";
} // namespace
void RendererFreezer::SuspendImminent() {
if (base::WriteFile(state_path_, kFreezeCommand, strlen(kFreezeCommand)) !=
static_cast<int>(strlen(kFreezeCommand))) {
PLOG(WARNING) << "Unable to freeze processes in the cgroup freezer.";
} else {
frozen_ = true;
}
}
void RendererFreezer::SuspendDone(const base::TimeDelta& sleep_duration) {
if (!frozen_)
return;
if (base::WriteFile(state_path_, kThawCommand, strlen(kThawCommand)) !=
static_cast<int>(strlen(kThawCommand))) {
// We failed to write the thaw command and the renderers are still frozen.
// We are in big trouble because none of the tabs will be responsive so
// let's crash the browser instead.
PLOG(FATAL) << "Unable to thaw processes in the cgroup freezer.";
}
frozen_ = false;
}
RendererFreezer::RendererFreezer()
: state_path_(base::FilePath(kFreezerStatePath)),
enabled_(base::PathExists(state_path_) &&
base::PathIsWritable(state_path_)),
frozen_(false) {
if (enabled_) {
DBusThreadManager::Get()->GetPowerManagerClient()->AddObserver(this);
} else {
LOG(WARNING) << "Cgroup freezer does not exist or is not writable. "
<< "Processes will not be frozen during suspend.";
}
}
RendererFreezer::~RendererFreezer() {
if (enabled_)
DBusThreadManager::Get()->GetPowerManagerClient()->RemoveObserver(this);
}
} // namespace chromeos
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