Repo created

TMessagesProj/jni/voip/webrtc/base/system/sys_info.cc

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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/system/sys_info.h"
+
+#include <algorithm>
+
+#include "base/base_switches.h"
+#include "base/bind.h"
+#include "base/callback.h"
+#include "base/command_line.h"
+#include "base/location.h"
+#include "base/logging.h"
+#include "base/no_destructor.h"
+#include "base/system/sys_info_internal.h"
+#include "base/task/post_task.h"
+#include "base/task/task_traits.h"
+#include "base/task/thread_pool.h"
+#include "base/task_runner_util.h"
+#include "base/time/time.h"
+#include "build/build_config.h"
+
+namespace base {
+namespace {
+static const int kLowMemoryDeviceThresholdMB = 512;
+}  // namespace
+
+// static
+int64_t SysInfo::AmountOfPhysicalMemory() {
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableLowEndDeviceMode)) {
+    return kLowMemoryDeviceThresholdMB * 1024 * 1024;
+  }
+
+  return AmountOfPhysicalMemoryImpl();
+}
+
+// static
+int64_t SysInfo::AmountOfAvailablePhysicalMemory() {
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableLowEndDeviceMode)) {
+    // Estimate the available memory by subtracting our memory used estimate
+    // from the fake |kLowMemoryDeviceThresholdMB| limit.
+    size_t memory_used =
+        AmountOfPhysicalMemoryImpl() - AmountOfAvailablePhysicalMemoryImpl();
+    size_t memory_limit = kLowMemoryDeviceThresholdMB * 1024 * 1024;
+    // std::min ensures no underflow, as |memory_used| can be > |memory_limit|.
+    return memory_limit - std::min(memory_used, memory_limit);
+  }
+
+  return AmountOfAvailablePhysicalMemoryImpl();
+}
+
+bool SysInfo::IsLowEndDevice() {
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableLowEndDeviceMode)) {
+    return true;
+  }
+
+  return IsLowEndDeviceImpl();
+}
+
+#if !defined(OS_ANDROID)
+
+bool DetectLowEndDevice() {
+  CommandLine* command_line = CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(switches::kEnableLowEndDeviceMode))
+    return true;
+  if (command_line->HasSwitch(switches::kDisableLowEndDeviceMode))
+    return false;
+
+  int ram_size_mb = SysInfo::AmountOfPhysicalMemoryMB();
+  return (ram_size_mb > 0 && ram_size_mb <= kLowMemoryDeviceThresholdMB);
+}
+
+// static
+bool SysInfo::IsLowEndDeviceImpl() {
+  static base::NoDestructor<
+      internal::LazySysInfoValue<bool, DetectLowEndDevice>>
+      instance;
+  return instance->value();
+}
+#endif
+
+#if !defined(OS_MACOSX) && !defined(OS_ANDROID)
+std::string SysInfo::HardwareModelName() {
+  return std::string();
+}
+#endif
+
+void SysInfo::GetHardwareInfo(base::OnceCallback<void(HardwareInfo)> callback) {
+#if defined(OS_WIN)
+  // On Windows the calls to GetHardwareInfoSync can take a really long time to
+  // complete as they depend on WMI, using the CONTINUE_ON_SHUTDOWN traits will
+  // prevent this task from blocking shutdown.
+  base::PostTaskAndReplyWithResult(
+      base::ThreadPool::CreateCOMSTATaskRunner(
+          {TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN})
+          .get(),
+      FROM_HERE, base::BindOnce(&GetHardwareInfoSync), std::move(callback));
+#elif defined(OS_ANDROID) || defined(OS_MACOSX)
+  base::ThreadPool::PostTaskAndReplyWithResult(
+      FROM_HERE, {}, base::BindOnce(&GetHardwareInfoSync), std::move(callback));
+#elif defined(OS_LINUX)
+  base::ThreadPool::PostTaskAndReplyWithResult(
+      FROM_HERE, {base::MayBlock()}, base::BindOnce(&GetHardwareInfoSync),
+      std::move(callback));
+#else
+  NOTIMPLEMENTED();
+  base::ThreadPool::PostTask(
+      FROM_HERE, {}, base::BindOnce(std::move(callback), HardwareInfo()));
+#endif
+}
+
+// static
+base::TimeDelta 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_t uptime_in_microseconds = TimeTicks::Now().ToInternalValue();
+  return base::TimeDelta::FromMicroseconds(uptime_in_microseconds);
+}
+
+}  // namespace base