| // 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 |
| |
| #if !defined(OS_MACOSX) || defined(OS_IOS) |
| std::string SysInfo::HardwareModelName() { |
| return std::string(); |
| } |
| #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 |