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// Copyright (c) 2012 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/sys_info.h"
#include "base/base_switches.h"
#include "base/command_line.h"
#include "base/lazy_instance.h"
#include "base/strings/string_number_conversions.h"
#include "base/sys_info_internal.h"
#include "base/time/time.h"
namespace base {
#if !defined(OS_ANDROID)
static const int kLowMemoryDeviceThresholdMB = 512;
bool DetectLowEndDevice() {
CommandLine* command_line = CommandLine::ForCurrentProcess();
int int_value = 0;
if (command_line->HasSwitch(switches::kLowEndDeviceMode)) {
std::string string_value =
command_line->GetSwitchValueASCII(switches::kLowEndDeviceMode);
StringToInt(string_value, &int_value);
}
if (int_value == 1)
return true;
if (int_value != 2)
return false;
int ram_size_mb = SysInfo::AmountOfPhysicalMemoryMB();
return (ram_size_mb > 0 && ram_size_mb < kLowMemoryDeviceThresholdMB);
}
static LazyInstance<
internal::LazySysInfoValue<bool, DetectLowEndDevice> >::Leaky
g_lazy_low_end_device = LAZY_INSTANCE_INITIALIZER;
// static
bool SysInfo::IsLowEndDevice() {
return g_lazy_low_end_device.Get().value();
}
#endif
// static
int64 SysInfo::Uptime() {
// This code relies on an implementation detail of TimeTicks::Now() - that
// its return value happens to coincide with the system uptime value in
// microseconds, on Win/Mac/iOS/Linux/ChromeOS and Android.
int64 uptime_in_microseconds = TimeTicks::Now().ToInternalValue();
return uptime_in_microseconds / 1000;
}
} // namespace base
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