126 lines
4.0 KiB
C++
126 lines
4.0 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/system/sys_info.h"
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#include <algorithm>
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#include "base/base_switches.h"
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#include "base/bind.h"
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#include "base/callback.h"
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#include "base/command_line.h"
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#include "base/location.h"
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#include "base/logging.h"
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#include "base/no_destructor.h"
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#include "base/system/sys_info_internal.h"
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#include "base/task/post_task.h"
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#include "base/task/task_traits.h"
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#include "base/task/thread_pool.h"
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#include "base/task_runner_util.h"
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#include "base/time/time.h"
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#include "build/build_config.h"
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namespace base {
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namespace {
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static const int kLowMemoryDeviceThresholdMB = 512;
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} // namespace
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// static
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int64_t SysInfo::AmountOfPhysicalMemory() {
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if (base::CommandLine::ForCurrentProcess()->HasSwitch(
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switches::kEnableLowEndDeviceMode)) {
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return kLowMemoryDeviceThresholdMB * 1024 * 1024;
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}
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return AmountOfPhysicalMemoryImpl();
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}
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// static
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int64_t SysInfo::AmountOfAvailablePhysicalMemory() {
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if (base::CommandLine::ForCurrentProcess()->HasSwitch(
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switches::kEnableLowEndDeviceMode)) {
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// Estimate the available memory by subtracting our memory used estimate
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// from the fake |kLowMemoryDeviceThresholdMB| limit.
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size_t memory_used =
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AmountOfPhysicalMemoryImpl() - AmountOfAvailablePhysicalMemoryImpl();
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size_t memory_limit = kLowMemoryDeviceThresholdMB * 1024 * 1024;
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// std::min ensures no underflow, as |memory_used| can be > |memory_limit|.
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return memory_limit - std::min(memory_used, memory_limit);
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}
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return AmountOfAvailablePhysicalMemoryImpl();
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}
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bool SysInfo::IsLowEndDevice() {
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if (base::CommandLine::ForCurrentProcess()->HasSwitch(
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switches::kEnableLowEndDeviceMode)) {
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return true;
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}
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return IsLowEndDeviceImpl();
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}
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#if !defined(OS_ANDROID)
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bool DetectLowEndDevice() {
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CommandLine* command_line = CommandLine::ForCurrentProcess();
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if (command_line->HasSwitch(switches::kEnableLowEndDeviceMode))
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return true;
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if (command_line->HasSwitch(switches::kDisableLowEndDeviceMode))
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return false;
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int ram_size_mb = SysInfo::AmountOfPhysicalMemoryMB();
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return (ram_size_mb > 0 && ram_size_mb <= kLowMemoryDeviceThresholdMB);
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}
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// static
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bool SysInfo::IsLowEndDeviceImpl() {
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static base::NoDestructor<
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internal::LazySysInfoValue<bool, DetectLowEndDevice>>
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instance;
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return instance->value();
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}
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#endif
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#if !defined(OS_MACOSX) && !defined(OS_ANDROID)
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std::string SysInfo::HardwareModelName() {
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return std::string();
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}
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#endif
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void SysInfo::GetHardwareInfo(base::OnceCallback<void(HardwareInfo)> callback) {
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#if defined(OS_WIN)
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// On Windows the calls to GetHardwareInfoSync can take a really long time to
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// complete as they depend on WMI, using the CONTINUE_ON_SHUTDOWN traits will
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// prevent this task from blocking shutdown.
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base::PostTaskAndReplyWithResult(
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base::ThreadPool::CreateCOMSTATaskRunner(
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{TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN})
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.get(),
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FROM_HERE, base::BindOnce(&GetHardwareInfoSync), std::move(callback));
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#elif defined(OS_ANDROID) || defined(OS_MACOSX)
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base::ThreadPool::PostTaskAndReplyWithResult(
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FROM_HERE, {}, base::BindOnce(&GetHardwareInfoSync), std::move(callback));
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#elif defined(OS_LINUX)
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base::ThreadPool::PostTaskAndReplyWithResult(
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FROM_HERE, {base::MayBlock()}, base::BindOnce(&GetHardwareInfoSync),
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std::move(callback));
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#else
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NOTIMPLEMENTED();
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base::ThreadPool::PostTask(
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FROM_HERE, {}, base::BindOnce(std::move(callback), HardwareInfo()));
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#endif
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}
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// static
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base::TimeDelta SysInfo::Uptime() {
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// This code relies on an implementation detail of TimeTicks::Now() - that
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// its return value happens to coincide with the system uptime value in
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// microseconds, on Win/Mac/iOS/Linux/ChromeOS and Android.
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int64_t uptime_in_microseconds = TimeTicks::Now().ToInternalValue();
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return base::TimeDelta::FromMicroseconds(uptime_in_microseconds);
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}
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} // namespace base
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