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browser_main_loop.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 "content/browser/browser_main_loop.h"
#include "base/bind.h"
#include "base/command_line.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/memory/memory_pressure_monitor.h"
#include "base/metrics/field_trial.h"
#include "base/metrics/histogram.h"
#include "base/pending_task.h"
#include "base/power_monitor/power_monitor.h"
#include "base/power_monitor/power_monitor_device_source.h"
#include "base/process/process_metrics.h"
#include "base/profiler/scoped_profile.h"
#include "base/run_loop.h"
#include "base/single_thread_task_runner.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/system_monitor/system_monitor.h"
#include "base/thread_task_runner_handle.h"
#include "base/threading/thread_restrictions.h"
#include "base/timer/hi_res_timer_manager.h"
#include "base/trace_event/memory_dump_manager.h"
#include "base/trace_event/trace_event.h"
#include "content/browser/browser_thread_impl.h"
#include "content/browser/device_sensors/device_inertial_sensor_service.h"
#include "content/browser/dom_storage/dom_storage_area.h"
#include "content/browser/download/save_file_manager.h"
#include "content/browser/gamepad/gamepad_service.h"
#include "content/browser/gpu/browser_gpu_channel_host_factory.h"
#include "content/browser/gpu/browser_gpu_memory_buffer_manager.h"
#include "content/browser/gpu/compositor_util.h"
#include "content/browser/gpu/gpu_data_manager_impl.h"
#include "content/browser/gpu/gpu_process_host.h"
#include "content/browser/gpu/gpu_process_host_ui_shim.h"
#include "content/browser/histogram_synchronizer.h"
#include "content/browser/loader/resource_dispatcher_host_impl.h"
#include "content/browser/media/media_internals.h"
#include "content/browser/mojo/mojo_shell_context.h"
#include "content/browser/net/browser_online_state_observer.h"
#include "content/browser/renderer_host/media/media_stream_manager.h"
#include "content/browser/speech/speech_recognition_manager_impl.h"
#include "content/browser/startup_task_runner.h"
#include "content/browser/time_zone_monitor.h"
#include "content/browser/webui/content_web_ui_controller_factory.h"
#include "content/browser/webui/url_data_manager.h"
#include "content/common/content_switches_internal.h"
#include "content/common/host_discardable_shared_memory_manager.h"
#include "content/common/host_shared_bitmap_manager.h"
#include "content/public/browser/browser_main_parts.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/browser/tracing_controller.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/main_function_params.h"
#include "content/public/common/result_codes.h"
#include "crypto/nss_util.h"
#include "device/battery/battery_status_service.h"
#include "media/audio/audio_manager.h"
#include "media/base/media.h"
#include "media/base/user_input_monitor.h"
#include "media/midi/midi_manager.h"
#include "net/base/network_change_notifier.h"
#include "net/socket/client_socket_factory.h"
#include "net/ssl/ssl_config_service.h"
#include "ui/base/clipboard/clipboard.h"
#if defined(USE_AURA) || (defined(OS_MACOSX) && !defined(OS_IOS))
#include "content/browser/compositor/image_transport_factory.h"
#endif
#if defined(USE_AURA)
#include "content/public/browser/context_factory.h"
#include "ui/aura/env.h"
#endif
#if !defined(OS_IOS)
#include "content/browser/renderer_host/render_process_host_impl.h"
#endif
#if defined(OS_ANDROID)
#include "base/android/jni_android.h"
#include "content/browser/android/browser_startup_controller.h"
#include "content/browser/android/browser_surface_texture_manager.h"
#include "content/browser/android/in_process_surface_texture_manager.h"
#include "content/browser/android/tracing_controller_android.h"
#include "content/browser/screen_orientation/screen_orientation_delegate_android.h"
#include "content/public/browser/screen_orientation_provider.h"
#include "ui/gl/gl_surface.h"
#endif
#if defined(OS_MACOSX)
#include "media/base/mac/avfoundation_glue.h"
#endif
#if defined(OS_MACOSX) && !defined(OS_IOS)
#include "base/memory/memory_pressure_monitor_mac.h"
#include "content/browser/bootstrap_sandbox_mac.h"
#include "content/browser/browser_io_surface_manager_mac.h"
#include "content/browser/cocoa/system_hotkey_helper_mac.h"
#include "content/browser/compositor/browser_compositor_view_mac.h"
#include "content/browser/in_process_io_surface_manager_mac.h"
#include "content/browser/theme_helper_mac.h"
#endif
#if defined(OS_WIN)
#include <windows.h>
#include <commctrl.h>
#include <shellapi.h>
#include "base/memory/memory_pressure_monitor_win.h"
#include "content/browser/system_message_window_win.h"
#include "content/common/sandbox_win.h"
#include "net/base/winsock_init.h"
#include "ui/base/l10n/l10n_util_win.h"
#endif
#if defined(OS_CHROMEOS)
#include "base/memory/memory_pressure_monitor_chromeos.h"
#include "chromeos/chromeos_switches.h"
#endif
#if defined(USE_GLIB)
#include <glib-object.h>
#endif
#if defined(OS_LINUX) && defined(USE_UDEV)
#include "content/browser/device_monitor_udev.h"
#elif defined(OS_MACOSX) && !defined(OS_IOS)
#include "content/browser/device_monitor_mac.h"
#endif
#if defined(OS_POSIX) && !defined(OS_MACOSX)
#include "content/browser/renderer_host/render_sandbox_host_linux.h"
#include "content/browser/zygote_host/zygote_host_impl_linux.h"
#include "sandbox/linux/suid/client/setuid_sandbox_host.h"
#endif
#if defined(ENABLE_PLUGINS)
#include "content/browser/plugin_service_impl.h"
#endif
#if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
#include "third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h"
#endif
#if defined(USE_X11)
#include "ui/gfx/x/x11_connection.h"
#include "ui/gfx/x/x11_types.h"
#endif
// One of the linux specific headers defines this as a macro.
#ifdef DestroyAll
#undef DestroyAll
#endif
namespace content {
namespace {
#if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
void SetupSandbox(const base::CommandLine& parsed_command_line) {
TRACE_EVENT0("startup", "SetupSandbox");
base::FilePath sandbox_binary;
scoped_ptr<sandbox::SetuidSandboxHost> setuid_sandbox_host(
sandbox::SetuidSandboxHost::Create());
const bool want_setuid_sandbox =
!parsed_command_line.HasSwitch(switches::kNoSandbox) &&
!parsed_command_line.HasSwitch(switches::kDisableSetuidSandbox) &&
!setuid_sandbox_host->IsDisabledViaEnvironment();
static const char no_suid_error[] =
"Running without the SUID sandbox! See "
"https://code.google.com/p/chromium/wiki/LinuxSUIDSandboxDevelopment "
"for more information on developing with the sandbox on.";
if (want_setuid_sandbox) {
sandbox_binary = setuid_sandbox_host->GetSandboxBinaryPath();
if (sandbox_binary.empty()) {
// This needs to be fatal. Talk to security@chromium.org if you feel
// otherwise.
LOG(FATAL) << no_suid_error;
}
} else {
LOG(ERROR) << no_suid_error;
}
// Tickle the sandbox host and zygote host so they fork now.
RenderSandboxHostLinux::GetInstance()->Init();
ZygoteHostImpl::GetInstance()->Init(sandbox_binary.value());
}
#endif
#if defined(USE_GLIB)
static void GLibLogHandler(const gchar* log_domain,
GLogLevelFlags log_level,
const gchar* message,
gpointer userdata) {
if (!log_domain)
log_domain = "<unknown>";
if (!message)
message = "<no message>";
if (strstr(message, "Unable to retrieve the file info for")) {
LOG(ERROR) << "GTK File code error: " << message;
} else if (strstr(message, "Could not find the icon") &&
strstr(log_domain, "Gtk")) {
LOG(ERROR) << "GTK icon error: " << message;
} else if (strstr(message, "Theme file for default has no") ||
strstr(message, "Theme directory") ||
strstr(message, "theme pixmap") ||
strstr(message, "locate theme engine")) {
LOG(ERROR) << "GTK theme error: " << message;
} else if (strstr(message, "Unable to create Ubuntu Menu Proxy") &&
strstr(log_domain, "<unknown>")) {
LOG(ERROR) << "GTK menu proxy create failed";
} else if (strstr(message, "Out of memory") &&
strstr(log_domain, "<unknown>")) {
LOG(ERROR) << "DBus call timeout or out of memory: "
<< "http://crosbug.com/15496";
} else if (strstr(message, "Could not connect: Connection refused") &&
strstr(log_domain, "<unknown>")) {
LOG(ERROR) << "DConf settings backend could not connect to session bus: "
<< "http://crbug.com/179797";
} else if (strstr(message, "Attempting to store changes into") ||
strstr(message, "Attempting to set the permissions of")) {
LOG(ERROR) << message << " (http://bugs.chromium.org/161366)";
} else if (strstr(message, "drawable is not a native X11 window")) {
LOG(ERROR) << message << " (http://bugs.chromium.org/329991)";
} else if (strstr(message, "Cannot do system-bus activation with no user")) {
LOG(ERROR) << message << " (http://crbug.com/431005)";
} else {
LOG(DFATAL) << log_domain << ": " << message;
}
}
static void SetUpGLibLogHandler() {
// Register GLib-handled assertions to go through our logging system.
const char* kLogDomains[] = { NULL, "Gtk", "Gdk", "GLib", "GLib-GObject" };
for (size_t i = 0; i < arraysize(kLogDomains); i++) {
g_log_set_handler(kLogDomains[i],
static_cast<GLogLevelFlags>(G_LOG_FLAG_RECURSION |
G_LOG_FLAG_FATAL |
G_LOG_LEVEL_ERROR |
G_LOG_LEVEL_CRITICAL |
G_LOG_LEVEL_WARNING),
GLibLogHandler,
NULL);
}
}
#endif
void OnStoppedStartupTracing(const base::FilePath& trace_file) {
VLOG(0) << "Completed startup tracing to " << trace_file.value();
}
// Disable optimizations for this block of functions so the compiler doesn't
// merge them all together. This makes it possible to tell what thread was
// unresponsive by inspecting the callstack.
MSVC_DISABLE_OPTIMIZE()
MSVC_PUSH_DISABLE_WARNING(4748)
NOINLINE void ResetThread_DB(scoped_ptr<BrowserProcessSubThread> thread) {
volatile int inhibit_comdat = __LINE__;
ALLOW_UNUSED_LOCAL(inhibit_comdat);
thread.reset();
}
NOINLINE void ResetThread_FILE(scoped_ptr<BrowserProcessSubThread> thread) {
volatile int inhibit_comdat = __LINE__;
ALLOW_UNUSED_LOCAL(inhibit_comdat);
thread.reset();
}
NOINLINE void ResetThread_FILE_USER_BLOCKING(
scoped_ptr<BrowserProcessSubThread> thread) {
volatile int inhibit_comdat = __LINE__;
ALLOW_UNUSED_LOCAL(inhibit_comdat);
thread.reset();
}
NOINLINE void ResetThread_PROCESS_LAUNCHER(
scoped_ptr<BrowserProcessSubThread> thread) {
volatile int inhibit_comdat = __LINE__;
ALLOW_UNUSED_LOCAL(inhibit_comdat);
thread.reset();
}
NOINLINE void ResetThread_CACHE(scoped_ptr<BrowserProcessSubThread> thread) {
volatile int inhibit_comdat = __LINE__;
ALLOW_UNUSED_LOCAL(inhibit_comdat);
thread.reset();
}
NOINLINE void ResetThread_IO(scoped_ptr<BrowserProcessSubThread> thread) {
volatile int inhibit_comdat = __LINE__;
ALLOW_UNUSED_LOCAL(inhibit_comdat);
thread.reset();
}
#if !defined(OS_IOS)
NOINLINE void ResetThread_IndexedDb(scoped_ptr<base::Thread> thread) {
volatile int inhibit_comdat = __LINE__;
ALLOW_UNUSED_LOCAL(inhibit_comdat);
thread.reset();
}
#endif
MSVC_POP_WARNING()
MSVC_ENABLE_OPTIMIZE();
#if defined(OS_WIN)
// Creates a memory pressure monitor using automatic thresholds, or those
// specified on the command-line. Ownership is passed to the caller.
base::win::MemoryPressureMonitor* CreateWinMemoryPressureMonitor(
const base::CommandLine& parsed_command_line) {
std::vector<std::string> thresholds;
base::SplitString(
parsed_command_line.GetSwitchValueASCII(
switches::kMemoryPressureThresholdsMb),
',',
&thresholds);
int moderate_threshold_mb = 0;
int critical_threshold_mb = 0;
if (thresholds.size() == 2 &&
base::StringToInt(thresholds[0], &moderate_threshold_mb) &&
base::StringToInt(thresholds[1], &critical_threshold_mb) &&
moderate_threshold_mb >= critical_threshold_mb &&
critical_threshold_mb >= 0) {
return new base::win::MemoryPressureMonitor(moderate_threshold_mb,
critical_threshold_mb);
}
// In absence of valid switches use the automatic defaults.
return new base::win::MemoryPressureMonitor();
}
#endif // defined(OS_WIN)
} // namespace
// The currently-running BrowserMainLoop. There can be one or zero.
BrowserMainLoop* g_current_browser_main_loop = NULL;
// For measuring memory usage after each task. Behind a command line flag.
class BrowserMainLoop::MemoryObserver : public base::MessageLoop::TaskObserver {
public:
MemoryObserver() {}
~MemoryObserver() override {}
void WillProcessTask(const base::PendingTask& pending_task) override {}
void DidProcessTask(const base::PendingTask& pending_task) override {
#if !defined(OS_IOS) // No ProcessMetrics on IOS.
scoped_ptr<base::ProcessMetrics> process_metrics(
base::ProcessMetrics::CreateProcessMetrics(
#if defined(OS_MACOSX)
base::GetCurrentProcessHandle(), NULL));
#else
base::GetCurrentProcessHandle()));
#endif
size_t private_bytes;
process_metrics->GetMemoryBytes(&private_bytes, NULL);
LOCAL_HISTOGRAM_MEMORY_KB("Memory.BrowserUsed", private_bytes >> 10);
#endif
}
private:
DISALLOW_COPY_AND_ASSIGN(MemoryObserver);
};
// BrowserMainLoop construction / destruction =============================
BrowserMainLoop* BrowserMainLoop::GetInstance() {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
return g_current_browser_main_loop;
}
BrowserMainLoop::BrowserMainLoop(const MainFunctionParams& parameters)
: parameters_(parameters),
parsed_command_line_(parameters.command_line),
result_code_(RESULT_CODE_NORMAL_EXIT),
created_threads_(false),
// ContentMainRunner should have enabled tracing of the browser process
// when kTraceStartup is in the command line.
is_tracing_startup_(
parameters.command_line.HasSwitch(switches::kTraceStartup)) {
DCHECK(!g_current_browser_main_loop);
g_current_browser_main_loop = this;
}
BrowserMainLoop::~BrowserMainLoop() {
DCHECK_EQ(this, g_current_browser_main_loop);
#if !defined(OS_IOS)
ui::Clipboard::DestroyClipboardForCurrentThread();
#endif // !defined(OS_IOS)
g_current_browser_main_loop = NULL;
}
void BrowserMainLoop::Init() {
TRACE_EVENT0("startup", "BrowserMainLoop::Init");
TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::Init");
parts_.reset(
GetContentClient()->browser()->CreateBrowserMainParts(parameters_));
}
// BrowserMainLoop stages ==================================================
void BrowserMainLoop::EarlyInitialization() {
TRACE_EVENT0("startup", "BrowserMainLoop::EarlyInitialization");
TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::EarlyInitialization");
#if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
// No thread should be created before this call, as SetupSandbox()
// will end-up using fork().
SetupSandbox(parsed_command_line_);
#endif
#if defined(USE_X11)
if (UsingInProcessGpu()) {
if (!gfx::InitializeThreadedX11()) {
LOG(ERROR) << "Failed to put Xlib into threaded mode.";
}
}
#endif
// GLib's spawning of new processes is buggy, so it's important that at this
// point GLib does not need to start DBUS. Chrome should always start with
// DBUS_SESSION_BUS_ADDRESS properly set. See crbug.com/309093.
#if defined(USE_GLIB)
// g_type_init will be deprecated in 2.36. 2.35 is the development
// version for 2.36, hence do not call g_type_init starting 2.35.
// http://developer.gnome.org/gobject/unstable/gobject-Type-Information.html#g-type-init
#if !GLIB_CHECK_VERSION(2, 35, 0)
// GLib type system initialization. Needed at least for gconf,
// used in net/proxy/proxy_config_service_linux.cc. Most likely
// this is superfluous as gtk_init() ought to do this. It's
// definitely harmless, so retained as a reminder of this
// requirement for gconf.
g_type_init();
#endif
SetUpGLibLogHandler();
#endif
if (parts_)
parts_->PreEarlyInitialization();
#if defined(OS_MACOSX)
// We use quite a few file descriptors for our IPC, and the default limit on
// the Mac is low (256), so bump it up.
base::SetFdLimit(1024);
#endif
#if defined(OS_WIN)
net::EnsureWinsockInit();
#endif
#if !defined(USE_OPENSSL)
// We want to be sure to init NSPR on the main thread.
crypto::EnsureNSPRInit();
#endif // !defined(USE_OPENSSL)
#if !defined(OS_IOS)
if (parsed_command_line_.HasSwitch(switches::kRendererProcessLimit)) {
std::string limit_string = parsed_command_line_.GetSwitchValueASCII(
switches::kRendererProcessLimit);
size_t process_limit;
if (base::StringToSizeT(limit_string, &process_limit)) {
RenderProcessHost::SetMaxRendererProcessCount(process_limit);
}
}
#endif // !defined(OS_IOS)
// TODO(boliu): kSingleProcess check is a temporary workaround for
// in-process Android WebView. crbug.com/503724 tracks proper fix.
if (!parsed_command_line_.HasSwitch(switches::kSingleProcess)) {
base::DiscardableMemoryAllocator::SetInstance(
HostDiscardableSharedMemoryManager::current());
}
if (parts_)
parts_->PostEarlyInitialization();
}
void BrowserMainLoop::PreMainMessageLoopStart() {
if (parts_) {
TRACE_EVENT0("startup",
"BrowserMainLoop::MainMessageLoopStart:PreMainMessageLoopStart");
parts_->PreMainMessageLoopStart();
}
#if defined(OS_WIN)
// If we're running tests (ui_task is non-null), then the ResourceBundle
// has already been initialized.
if (!parameters_.ui_task) {
// Override the configured locale with the user's preferred UI language.
l10n_util::OverrideLocaleWithUILanguageList();
}
#endif
}
void BrowserMainLoop::MainMessageLoopStart() {
// DO NOT add more code here. Use PreMainMessageLoopStart() above or
// PostMainMessageLoopStart() below.
TRACE_EVENT0("startup", "BrowserMainLoop::MainMessageLoopStart");
TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::MainMessageLoopStart");
// Create a MessageLoop if one does not already exist for the current thread.
if (!base::MessageLoop::current())
main_message_loop_.reset(new base::MessageLoopForUI);
InitializeMainThread();
}
void BrowserMainLoop::PostMainMessageLoopStart() {
{
TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:SystemMonitor");
system_monitor_.reset(new base::SystemMonitor);
}
{
TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:PowerMonitor");
scoped_ptr<base::PowerMonitorSource> power_monitor_source(
new base::PowerMonitorDeviceSource());
power_monitor_.reset(new base::PowerMonitor(power_monitor_source.Pass()));
}
{
TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:HighResTimerManager");
hi_res_timer_manager_.reset(new base::HighResolutionTimerManager);
}
{
TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:NetworkChangeNotifier");
network_change_notifier_.reset(net::NetworkChangeNotifier::Create());
}
#if !defined(OS_IOS)
{
TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MediaFeatures");
media::InitializeMediaLibrary();
}
{
TRACE_EVENT0("startup",
"BrowserMainLoop::Subsystem:ContentWebUIController");
WebUIControllerFactory::RegisterFactory(
ContentWebUIControllerFactory::GetInstance());
}
{
TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:OnlineStateObserver");
online_state_observer_.reset(new BrowserOnlineStateObserver);
}
{
system_stats_monitor_.reset(
new base::trace_event::TraceEventSystemStatsMonitor(
base::ThreadTaskRunnerHandle::Get()));
}
#endif // !defined(OS_IOS)
#if defined(OS_WIN)
system_message_window_.reset(new SystemMessageWindowWin);
#endif
if (parts_)
parts_->PostMainMessageLoopStart();
#if !defined(OS_IOS)
// Start tracing to a file if needed. Only do this after starting the main
// message loop to avoid calling MessagePumpForUI::ScheduleWork() before
// MessagePumpForUI::Start() as it will crash the browser.
if (is_tracing_startup_) {
TRACE_EVENT0("startup", "BrowserMainLoop::InitStartupTracing");
InitStartupTracing(parsed_command_line_);
}
#endif // !defined(OS_IOS)
#if defined(OS_ANDROID)
{
TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:SurfaceTextureManager");
if (parsed_command_line_.HasSwitch(switches::kSingleProcess)) {
SurfaceTextureManager::SetInstance(
InProcessSurfaceTextureManager::GetInstance());
} else {
SurfaceTextureManager::SetInstance(
BrowserSurfaceTextureManager::GetInstance());
}
}
if (!parsed_command_line_.HasSwitch(
switches::kDisableScreenOrientationLock)) {
TRACE_EVENT0("startup",
"BrowserMainLoop::Subsystem:ScreenOrientationProvider");
screen_orientation_delegate_.reset(
new ScreenOrientationDelegateAndroid());
ScreenOrientationProvider::SetDelegate(screen_orientation_delegate_.get());
}
#endif
#if defined(OS_MACOSX) && !defined(OS_IOS)
{
TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:IOSurfaceManager");
if (parsed_command_line_.HasSwitch(switches::kSingleProcess)) {
IOSurfaceManager::SetInstance(InProcessIOSurfaceManager::GetInstance());
} else {
IOSurfaceManager::SetInstance(BrowserIOSurfaceManager::GetInstance());
}
}
#endif
if (parsed_command_line_.HasSwitch(switches::kMemoryMetrics)) {
TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MemoryObserver");
memory_observer_.reset(new MemoryObserver());
base::MessageLoop::current()->AddTaskObserver(memory_observer_.get());
}
if (parsed_command_line_.HasSwitch(
switches::kEnableAggressiveDOMStorageFlushing)) {
TRACE_EVENT0("startup",
"BrowserMainLoop::Subsystem:EnableAggressiveCommitDelay");
DOMStorageArea::EnableAggressiveCommitDelay();
}
base::trace_event::MemoryDumpManager::GetInstance()->Initialize();
// Enable the dump providers.
base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
HostSharedBitmapManager::current());
#if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
trace_memory_controller_.reset(new base::trace_event::TraceMemoryController(
base::MessageLoop::current()->task_runner(),
::HeapProfilerWithPseudoStackStart, ::HeapProfilerStop,
::GetHeapProfile));
#endif
}
int BrowserMainLoop::PreCreateThreads() {
// Need to initialize in-process GpuDataManager before creating threads.
// It's unsafe to append the gpu command line switches to the global
// CommandLine::ForCurrentProcess object after threads are created.
// Also need to initialize before BrowserMainParts::PreCreateThreads, so
// BrowserMainParts has a hook to set GpuDataManager strings before
// starting Gpu process.
GpuDataManagerImpl::GetInstance()->Initialize();
if (parts_) {
TRACE_EVENT0("startup",
"BrowserMainLoop::CreateThreads:PreCreateThreads");
TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::PreCreateThreads");
result_code_ = parts_->PreCreateThreads();
}
// TODO(chrisha): Abstract away this construction mess to a helper function,
// once MemoryPressureMonitor is made a concrete class.
#if defined(OS_CHROMEOS)
if (chromeos::switches::MemoryPressureHandlingEnabled()) {
memory_pressure_monitor_.reset(new base::chromeos::MemoryPressureMonitor(
chromeos::switches::GetMemoryPressureThresholds()));
}
#elif defined(OS_MACOSX) && !defined(OS_IOS)
memory_pressure_monitor_.reset(new base::mac::MemoryPressureMonitor());
#elif defined(OS_WIN)
memory_pressure_monitor_.reset(CreateWinMemoryPressureMonitor(
parsed_command_line_));
#endif
#if defined(ENABLE_PLUGINS)
// Prior to any processing happening on the io thread, we create the
// plugin service as it is predominantly used from the io thread,
// but must be created on the main thread. The service ctor is
// inexpensive and does not invoke the io_thread() accessor.
{
TRACE_EVENT0("startup", "BrowserMainLoop::CreateThreads:PluginService");
PluginService::GetInstance()->Init();
}
#endif
#if defined(OS_MACOSX)
{
// Initialize AVFoundation if supported, for audio and video.
TRACE_EVENT0("startup",
"BrowserMainLoop::CreateThreads:InitializeAVFoundation");
AVFoundationGlue::InitializeAVFoundation();
}
#endif
#if !defined(OS_IOS) && (!defined(GOOGLE_CHROME_BUILD) || defined(OS_ANDROID))
// Single-process is an unsupported and not fully tested mode, so
// don't enable it for official Chrome builds (except on Android).
if (parsed_command_line_.HasSwitch(switches::kSingleProcess))
RenderProcessHost::SetRunRendererInProcess(true);
#endif
return result_code_;
}
void BrowserMainLoop::CreateStartupTasks() {
TRACE_EVENT0("startup", "BrowserMainLoop::CreateStartupTasks");
TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::CreateStartupTasks");
// First time through, we really want to create all the tasks
if (!startup_task_runner_.get()) {
#if defined(OS_ANDROID)
startup_task_runner_ = make_scoped_ptr(
new StartupTaskRunner(base::Bind(&BrowserStartupComplete),
base::ThreadTaskRunnerHandle::Get()));
#else
startup_task_runner_ = make_scoped_ptr(
new StartupTaskRunner(base::Callback<void(int)>(),
base::ThreadTaskRunnerHandle::Get()));
#endif
StartupTask pre_create_threads =
base::Bind(&BrowserMainLoop::PreCreateThreads, base::Unretained(this));
startup_task_runner_->AddTask(pre_create_threads);
StartupTask create_threads =
base::Bind(&BrowserMainLoop::CreateThreads, base::Unretained(this));
startup_task_runner_->AddTask(create_threads);
StartupTask browser_thread_started = base::Bind(
&BrowserMainLoop::BrowserThreadsStarted, base::Unretained(this));
startup_task_runner_->AddTask(browser_thread_started);
StartupTask pre_main_message_loop_run = base::Bind(
&BrowserMainLoop::PreMainMessageLoopRun, base::Unretained(this));
startup_task_runner_->AddTask(pre_main_message_loop_run);
#if defined(OS_ANDROID)
if (BrowserMayStartAsynchronously()) {
startup_task_runner_->StartRunningTasksAsync();
}
#endif
}
#if defined(OS_ANDROID)
if (!BrowserMayStartAsynchronously()) {
// A second request for asynchronous startup can be ignored, so
// StartupRunningTasksAsync is only called first time through. If, however,
// this is a request for synchronous startup then it must override any
// previous call for async startup, so we call RunAllTasksNow()
// unconditionally.
startup_task_runner_->RunAllTasksNow();
}
#else
startup_task_runner_->RunAllTasksNow();
#endif
}
int BrowserMainLoop::CreateThreads() {
TRACE_EVENT0("startup", "BrowserMainLoop::CreateThreads");
TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::CreateThreads");
base::Thread::Options io_message_loop_options;
io_message_loop_options.message_loop_type = base::MessageLoop::TYPE_IO;
base::Thread::Options ui_message_loop_options;
ui_message_loop_options.message_loop_type = base::MessageLoop::TYPE_UI;
// Start threads in the order they occur in the BrowserThread::ID
// enumeration, except for BrowserThread::UI which is the main
// thread.
//
// Must be size_t so we can increment it.
for (size_t thread_id = BrowserThread::UI + 1;
thread_id < BrowserThread::ID_COUNT;
++thread_id) {
scoped_ptr<BrowserProcessSubThread>* thread_to_start = NULL;
base::Thread::Options options;
switch (thread_id) {
case BrowserThread::DB:
TRACE_EVENT_BEGIN1("startup",
"BrowserMainLoop::CreateThreads:start",
"Thread", "BrowserThread::DB");
thread_to_start = &db_thread_;
options.timer_slack = base::TIMER_SLACK_MAXIMUM;
break;
case BrowserThread::FILE_USER_BLOCKING:
TRACE_EVENT_BEGIN1("startup",
"BrowserMainLoop::CreateThreads:start",
"Thread", "BrowserThread::FILE_USER_BLOCKING");
thread_to_start = &file_user_blocking_thread_;
break;
case BrowserThread::FILE:
TRACE_EVENT_BEGIN1("startup",
"BrowserMainLoop::CreateThreads:start",
"Thread", "BrowserThread::FILE");
thread_to_start = &file_thread_;
#if defined(OS_WIN)
// On Windows, the FILE thread needs to be have a UI message loop
// which pumps messages in such a way that Google Update can
// communicate back to us.
options = ui_message_loop_options;
#else
options = io_message_loop_options;
#endif
options.timer_slack = base::TIMER_SLACK_MAXIMUM;
break;
case BrowserThread::PROCESS_LAUNCHER:
TRACE_EVENT_BEGIN1("startup",
"BrowserMainLoop::CreateThreads:start",
"Thread", "BrowserThread::PROCESS_LAUNCHER");
thread_to_start = &process_launcher_thread_;
options.timer_slack = base::TIMER_SLACK_MAXIMUM;
break;
case BrowserThread::CACHE:
TRACE_EVENT_BEGIN1("startup",
"BrowserMainLoop::CreateThreads:start",
"Thread", "BrowserThread::CACHE");
thread_to_start = &cache_thread_;
options = io_message_loop_options;
options.timer_slack = base::TIMER_SLACK_MAXIMUM;
break;
case BrowserThread::IO:
TRACE_EVENT_BEGIN1("startup",
"BrowserMainLoop::CreateThreads:start",
"Thread", "BrowserThread::IO");
thread_to_start = &io_thread_;
options = io_message_loop_options;
#if defined(OS_ANDROID)
// Up the priority of the |io_thread_| as some of its IPCs relate to
// display tasks.
options.priority = base::ThreadPriority::DISPLAY;
#endif
break;
case BrowserThread::UI:
case BrowserThread::ID_COUNT:
default:
NOTREACHED();
break;
}
BrowserThread::ID id = static_cast<BrowserThread::ID>(thread_id);
if (thread_to_start) {
(*thread_to_start).reset(new BrowserProcessSubThread(id));
if (!(*thread_to_start)->StartWithOptions(options)) {
LOG(FATAL) << "Failed to start the browser thread: id == " << id;
}
} else {
NOTREACHED();
}
TRACE_EVENT_END0("startup", "BrowserMainLoop::CreateThreads:start");
}
created_threads_ = true;
return result_code_;
}
int BrowserMainLoop::PreMainMessageLoopRun() {
if (parts_) {
TRACE_EVENT0("startup",
"BrowserMainLoop::CreateThreads:PreMainMessageLoopRun");
TRACK_SCOPED_REGION(
"Startup", "BrowserMainLoop::PreMainMessageLoopRun");
parts_->PreMainMessageLoopRun();
}
// If the UI thread blocks, the whole UI is unresponsive.
// Do not allow disk IO from the UI thread.
base::ThreadRestrictions::SetIOAllowed(false);
base::ThreadRestrictions::DisallowWaiting();
return result_code_;
}
void BrowserMainLoop::RunMainMessageLoopParts() {
TRACE_EVENT_BEGIN_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
bool ran_main_loop = false;
if (parts_)
ran_main_loop = parts_->MainMessageLoopRun(&result_code_);
if (!ran_main_loop)
MainMessageLoopRun();
TRACE_EVENT_END_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
}
void BrowserMainLoop::ShutdownThreadsAndCleanUp() {
if (!created_threads_) {
// Called early, nothing to do
return;
}
TRACE_EVENT0("shutdown", "BrowserMainLoop::ShutdownThreadsAndCleanUp");
// Teardown may start in PostMainMessageLoopRun, and during teardown we
// need to be able to perform IO.
base::ThreadRestrictions::SetIOAllowed(true);
BrowserThread::PostTask(
BrowserThread::IO, FROM_HERE,
base::Bind(base::IgnoreResult(&base::ThreadRestrictions::SetIOAllowed),
true));
mojo_shell_context_.reset();
#if !defined(OS_IOS)
if (RenderProcessHost::run_renderer_in_process())
RenderProcessHostImpl::ShutDownInProcessRenderer();
#endif
if (parts_) {
TRACE_EVENT0("shutdown",
"BrowserMainLoop::Subsystem:PostMainMessageLoopRun");
parts_->PostMainMessageLoopRun();
}
trace_memory_controller_.reset();
system_stats_monitor_.reset();
#if !defined(OS_IOS)
// Destroying the GpuProcessHostUIShims on the UI thread posts a task to
// delete related objects on the GPU thread. This must be done before
// stopping the GPU thread. The GPU thread will close IPC channels to renderer
// processes so this has to happen before stopping the IO thread.
{
TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GPUProcessHostShim");
GpuProcessHostUIShim::DestroyAll();
}
// Cancel pending requests and prevent new requests.
if (resource_dispatcher_host_) {
TRACE_EVENT0("shutdown",
"BrowserMainLoop::Subsystem:ResourceDispatcherHost");
resource_dispatcher_host_.get()->Shutdown();
}
memory_pressure_monitor_.reset();
#if defined(OS_MACOSX)
BrowserCompositorMac::DisableRecyclingForShutdown();
#endif
#if defined(USE_AURA) || defined(OS_MACOSX)
{
TRACE_EVENT0("shutdown",
"BrowserMainLoop::Subsystem:ImageTransportFactory");
ImageTransportFactory::Terminate();
}
#endif
#if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
ZygoteHostImpl::GetInstance()->TearDownAfterLastChild();
#endif // defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
// The device monitors are using |system_monitor_| as dependency, so delete
// them before |system_monitor_| goes away.
// On Mac and windows, the monitor needs to be destroyed on the same thread
// as they were created. On Linux, the monitor will be deleted when IO thread
// goes away.
#if defined(OS_WIN)
system_message_window_.reset();
#elif defined(OS_MACOSX)
device_monitor_mac_.reset();
#endif
#endif // !defined(OS_IOS)
// Must be size_t so we can subtract from it.
for (size_t thread_id = BrowserThread::ID_COUNT - 1;
thread_id >= (BrowserThread::UI + 1);
--thread_id) {
// Find the thread object we want to stop. Looping over all valid
// BrowserThread IDs and DCHECKing on a missing case in the switch
// statement helps avoid a mismatch between this code and the
// BrowserThread::ID enumeration.
//
// The destruction order is the reverse order of occurrence in the
// BrowserThread::ID list. The rationale for the order is as
// follows (need to be filled in a bit):
//
//
// - The IO thread is the only user of the CACHE thread.
//
// - The PROCESS_LAUNCHER thread must be stopped after IO in case
// the IO thread posted a task to terminate a process on the
// process launcher thread.
//
// - (Not sure why DB stops last.)
switch (thread_id) {
case BrowserThread::DB: {
TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:DBThread");
ResetThread_DB(db_thread_.Pass());
break;
}
case BrowserThread::FILE: {
TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:FileThread");
#if !defined(OS_IOS)
// Clean up state that lives on or uses the file_thread_ before
// it goes away.
if (resource_dispatcher_host_)
resource_dispatcher_host_.get()->save_file_manager()->Shutdown();
#endif // !defined(OS_IOS)
ResetThread_FILE(file_thread_.Pass());
break;
}
case BrowserThread::FILE_USER_BLOCKING: {