content/browser/browser_main_loop.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/browser_main_loop.h"
   6
   7 #include "base/bind.h"
   8 #include "base/command_line.h"
   9 #include "base/debug/trace_event.h"
  10 #include "base/hi_res_timer_manager.h"
  11 #include "base/logging.h"
  12 #include "base/message_loop.h"
  13 #include "base/metrics/field_trial.h"
  14 #include "base/metrics/histogram.h"
  15 #include "base/run_loop.h"
  16 #include "base/string_number_conversions.h"
  17 #include "base/threading/thread_restrictions.h"
  18 #include "content/browser/browser_thread_impl.h"
  19 #include "content/browser/download/save_file_manager.h"
  20 #include "content/browser/gamepad/gamepad_service.h"
  21 #include "content/browser/gpu/browser_gpu_channel_host_factory.h"
  22 #include "content/browser/gpu/gpu_data_manager_impl.h"
  23 #include "content/browser/gpu/gpu_process_host.h"
  24 #include "content/browser/gpu/gpu_process_host_ui_shim.h"
  25 #include "content/browser/histogram_synchronizer.h"
  26 #include "content/browser/in_process_webkit/webkit_thread.h"
  27 #include "content/browser/loader/resource_dispatcher_host_impl.h"
  28 #include "content/browser/net/browser_online_state_observer.h"
  29 #include "content/browser/plugin_service_impl.h"
  30 #include "content/browser/renderer_host/media/media_stream_manager.h"
  31 #include "content/browser/speech/speech_recognition_manager_impl.h"
  32 #include "content/browser/trace_controller_impl.h"
  33 #include "content/public/browser/browser_main_parts.h"
  34 #include "content/public/browser/browser_shutdown.h"
  35 #include "content/public/browser/compositor_util.h"
  36 #include "content/public/browser/content_browser_client.h"
  37 #include "content/public/browser/render_process_host.h"
  38 #include "content/public/common/content_switches.h"
  39 #include "content/public/common/main_function_params.h"
  40 #include "content/public/common/result_codes.h"
  41 #include "crypto/nss_util.h"
  42 #include "media/audio/audio_manager.h"
  43 #include "net/base/network_change_notifier.h"
  44 #include "net/base/ssl_config_service.h"
  45 #include "net/socket/client_socket_factory.h"
  46 #include "net/socket/tcp_client_socket.h"
  47 #include "ui/base/clipboard/clipboard.h"
  48
  49 #if defined(USE_AURA)
  50 #include "content/browser/renderer_host/image_transport_factory.h"
  51 #endif
  52
  53 #if defined(OS_ANDROID)
  54 #include "base/android/jni_android.h"
  55 #include "content/browser/android/surface_texture_peer_browser_impl.h"
  56 #include "content/browser/device_orientation/data_fetcher_impl_android.h"
  57 #endif
  58
  59 #if defined(OS_WIN)
  60 #include <windows.h>
  61 #include <commctrl.h>
  62 #include <shellapi.h>
  63
  64 #include "content/browser/system_message_window_win.h"
  65 #include "content/common/sandbox_policy.h"
  66 #include "ui/base/l10n/l10n_util_win.h"
  67 #include "net/base/winsock_init.h"
  68 #endif
  69
  70 #if defined(OS_LINUX) || defined(OS_OPENBSD)
  71 #include <glib-object.h>
  72 #endif
  73
  74 #if defined(OS_LINUX)
  75 #include "content/browser/device_monitor_linux.h"
  76 #elif defined(OS_MACOSX) && !defined(OS_IOS)
  77 #include "content/browser/device_monitor_mac.h"
  78 #endif
  79
  80 #if defined(TOOLKIT_GTK)
  81 #include "ui/gfx/gtk_util.h"
  82 #endif
  83
  84 #if defined(OS_POSIX) && !defined(OS_MACOSX)
  85 #include <sys/stat.h>
  86
  87 #include "base/process_util.h"
  88 #include "content/browser/renderer_host/render_sandbox_host_linux.h"
  89 #include "content/browser/zygote_host/zygote_host_impl_linux.h"
  90 #endif
  91
  92 #if defined(USE_X11)
  93 #include <X11/Xlib.h>
  94 #endif
  95
  96 // One of the linux specific headers defines this as a macro.
  97 #ifdef DestroyAll
  98 #undef DestroyAll
  99 #endif
 100
 101 namespace content {
 102 namespace {
 103
 104 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 105 void SetupSandbox(const CommandLine& parsed_command_line) {
 106   // TODO(evanm): move this into SandboxWrapper; I'm just trying to move this
 107   // code en masse out of chrome_main for now.
 108   const char* sandbox_binary = NULL;
 109   struct stat st;
 110
 111   // In Chromium branded builds, developers can set an environment variable to
 112   // use the development sandbox. See
 113   // http://code.google.com/p/chromium/wiki/LinuxSUIDSandboxDevelopment
 114   if (stat(base::kProcSelfExe, &st) == 0 && st.st_uid == getuid())
 115     sandbox_binary = getenv("CHROME_DEVEL_SANDBOX");
 116
 117 #if defined(LINUX_SANDBOX_PATH)
 118   if (!sandbox_binary)
 119     sandbox_binary = LINUX_SANDBOX_PATH;
 120 #endif
 121
 122   std::string sandbox_cmd;
 123   if (sandbox_binary && !parsed_command_line.HasSwitch(switches::kNoSandbox))
 124     sandbox_cmd = sandbox_binary;
 125
 126   // Tickle the sandbox host and zygote host so they fork now.
 127   RenderSandboxHostLinux::GetInstance()->Init(sandbox_cmd);
 128   ZygoteHostImpl::GetInstance()->Init(sandbox_cmd);
 129 }
 130 #endif
 131
 132 #if defined(OS_LINUX) || defined(OS_OPENBSD)
 133 static void GLibLogHandler(const gchar* log_domain,
 134                            GLogLevelFlags log_level,
 135                            const gchar* message,
 136                            gpointer userdata) {
 137   if (!log_domain)
 138     log_domain = "<unknown>";
 139   if (!message)
 140     message = "<no message>";
 141
 142   if (strstr(message, "Loading IM context type") ||
 143       strstr(message, "wrong ELF class: ELFCLASS64")) {
 144     // http://crbug.com/9643
 145     // Until we have a real 64-bit build or all of these 32-bit package issues
 146     // are sorted out, don't fatal on ELF 32/64-bit mismatch warnings and don't
 147     // spam the user with more than one of them.
 148     static bool alerted = false;
 149     if (!alerted) {
 150       LOG(ERROR) << "Bug 9643: " << log_domain << ": " << message;
 151       alerted = true;
 152     }
 153   } else if (strstr(message, "Unable to retrieve the file info for")) {
 154     LOG(ERROR) << "GTK File code error: " << message;
 155   } else if (strstr(message, "Theme file for default has no") ||
 156              strstr(message, "Theme directory") ||
 157              strstr(message, "theme pixmap") ||
 158              strstr(message, "locate theme engine")) {
 159     LOG(ERROR) << "GTK theme error: " << message;
 160   } else if (strstr(message, "Unable to create Ubuntu Menu Proxy") &&
 161              strstr(log_domain, "<unknown>")) {
 162     LOG(ERROR) << "GTK menu proxy create failed";
 163   } else if (strstr(message, "gtk_drag_dest_leave: assertion")) {
 164     LOG(ERROR) << "Drag destination deleted: http://crbug.com/18557";
 165   } else if (strstr(message, "Out of memory") &&
 166              strstr(log_domain, "<unknown>")) {
 167     LOG(ERROR) << "DBus call timeout or out of memory: "
 168                << "http://crosbug.com/15496";
 169   } else if (strstr(message, "XDG_RUNTIME_DIR variable not set")) {
 170     LOG(ERROR) << message << " (http://bugs.chromium.org/97293)";
 171   } else if (strstr(message, "Attempting to store changes into") ||
 172              strstr(message, "Attempting to set the permissions of")) {
 173     LOG(ERROR) << message << " (http://bugs.chromium.org/161366)";
 174   } else {
 175     LOG(DFATAL) << log_domain << ": " << message;
 176   }
 177 }
 178
 179 static void SetUpGLibLogHandler() {
 180   // Register GLib-handled assertions to go through our logging system.
 181   const char* kLogDomains[] = { NULL, "Gtk", "Gdk", "GLib", "GLib-GObject" };
 182   for (size_t i = 0; i < arraysize(kLogDomains); i++) {
 183     g_log_set_handler(kLogDomains[i],
 184                       static_cast<GLogLevelFlags>(G_LOG_FLAG_RECURSION |
 185                                                   G_LOG_FLAG_FATAL |
 186                                                   G_LOG_LEVEL_ERROR |
 187                                                   G_LOG_LEVEL_CRITICAL |
 188                                                   G_LOG_LEVEL_WARNING),
 189                       GLibLogHandler,
 190                       NULL);
 191   }
 192 }
 193 #endif
 194
 195 }  // namespace
 196
 197 // The currently-running BrowserMainLoop.  There can be one or zero.
 198 BrowserMainLoop* g_current_browser_main_loop = NULL;
 199
 200 // This is just to be able to keep ShutdownThreadsAndCleanUp out of
 201 // the public interface of BrowserMainLoop.
 202 class BrowserShutdownImpl {
 203  public:
 204   static void ImmediateShutdownAndExitProcess() {
 205     DCHECK(g_current_browser_main_loop);
 206     g_current_browser_main_loop->ShutdownThreadsAndCleanUp();
 207
 208 #if defined(OS_WIN)
 209     // At this point the message loop is still running yet we've shut everything
 210     // down. If any messages are processed we'll likely crash. Exit now.
 211     ExitProcess(RESULT_CODE_NORMAL_EXIT);
 212 #elif defined(OS_POSIX) && !defined(OS_MACOSX)
 213     _exit(RESULT_CODE_NORMAL_EXIT);
 214 #else
 215     NOTIMPLEMENTED();
 216 #endif
 217   }
 218 };
 219
 220 void ImmediateShutdownAndExitProcess() {
 221   BrowserShutdownImpl::ImmediateShutdownAndExitProcess();
 222 }
 223
 224 // static
 225 media::AudioManager* BrowserMainLoop::GetAudioManager() {
 226   return g_current_browser_main_loop->audio_manager_.get();
 227 }
 228
 229 // static
 230 MediaStreamManager* BrowserMainLoop::GetMediaStreamManager() {
 231   return g_current_browser_main_loop->media_stream_manager_.get();
 232 }
 233 // BrowserMainLoop construction / destruction =============================
 234
 235 BrowserMainLoop::BrowserMainLoop(const MainFunctionParams& parameters)
 236     : parameters_(parameters),
 237       parsed_command_line_(parameters.command_line),
 238       result_code_(RESULT_CODE_NORMAL_EXIT) {
 239   DCHECK(!g_current_browser_main_loop);
 240   g_current_browser_main_loop = this;
 241 }
 242
 243 BrowserMainLoop::~BrowserMainLoop() {
 244   DCHECK_EQ(this, g_current_browser_main_loop);
 245 #if !defined(OS_IOS)
 246   ui::Clipboard::DestroyClipboardForCurrentThread();
 247 #endif  // !defined(OS_IOS)
 248   g_current_browser_main_loop = NULL;
 249 }
 250
 251 void BrowserMainLoop::Init() {
 252   parts_.reset(
 253       GetContentClient()->browser()->CreateBrowserMainParts(parameters_));
 254 }
 255
 256 // BrowserMainLoop stages ==================================================
 257
 258 void BrowserMainLoop::EarlyInitialization() {
 259 #if defined(USE_X11)
 260   if (parsed_command_line_.HasSwitch(switches::kSingleProcess) ||
 261       parsed_command_line_.HasSwitch(switches::kInProcessGPU)) {
 262     if (!XInitThreads()) {
 263       LOG(ERROR) << "Failed to put Xlib into threaded mode.";
 264     }
 265   }
 266 #endif
 267
 268   if (parts_.get())
 269     parts_->PreEarlyInitialization();
 270
 271 #if defined(OS_WIN)
 272   net::EnsureWinsockInit();
 273 #endif
 274
 275 #if !defined(USE_OPENSSL)
 276   // Use NSS for SSL by default.
 277   // The default client socket factory uses NSS for SSL by default on
 278   // Windows and Mac.
 279   bool init_nspr = false;
 280 #if defined(OS_WIN) || defined(OS_MACOSX)
 281   if (parsed_command_line_.HasSwitch(switches::kUseSystemSSL)) {
 282     net::ClientSocketFactory::UseSystemSSL();
 283   } else {
 284     init_nspr = true;
 285   }
 286   UMA_HISTOGRAM_BOOLEAN("Chrome.CommandLineUseSystemSSL", !init_nspr);
 287 #elif defined(USE_NSS)
 288   init_nspr = true;
 289 #endif
 290   if (init_nspr) {
 291     // We want to be sure to init NSPR on the main thread.
 292     crypto::EnsureNSPRInit();
 293   }
 294 #endif  // !defined(USE_OPENSSL)
 295
 296 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 297   SetupSandbox(parsed_command_line_);
 298 #endif
 299
 300   if (parsed_command_line_.HasSwitch(switches::kEnableSSLCachedInfo))
 301     net::SSLConfigService::EnableCachedInfo();
 302
 303   // TODO(abarth): Should this move to InitializeNetworkOptions?  This doesn't
 304   // seem dependent on SSL initialization().
 305   if (parsed_command_line_.HasSwitch(switches::kEnableTcpFastOpen))
 306     net::set_tcp_fastopen_enabled(true);
 307
 308 #if !defined(OS_IOS)
 309   if (parsed_command_line_.HasSwitch(switches::kRendererProcessLimit)) {
 310     std::string limit_string = parsed_command_line_.GetSwitchValueASCII(
 311         switches::kRendererProcessLimit);
 312     size_t process_limit;
 313     if (base::StringToSizeT(limit_string, &process_limit)) {
 314       RenderProcessHost::SetMaxRendererProcessCount(process_limit);
 315     }
 316   }
 317 #endif  // !defined(OS_IOS)
 318
 319   if (parts_.get())
 320     parts_->PostEarlyInitialization();
 321 }
 322
 323 void BrowserMainLoop::MainMessageLoopStart() {
 324   if (parts_.get())
 325     parts_->PreMainMessageLoopStart();
 326
 327 #if defined(OS_WIN)
 328   // If we're running tests (ui_task is non-null), then the ResourceBundle
 329   // has already been initialized.
 330   if (!parameters_.ui_task) {
 331     // Override the configured locale with the user's preferred UI language.
 332     l10n_util::OverrideLocaleWithUILanguageList();
 333   }
 334 #endif
 335
 336   // Create a MessageLoop if one does not already exist for the current thread.
 337   if (!MessageLoop::current())
 338     main_message_loop_.reset(new MessageLoop(MessageLoop::TYPE_UI));
 339
 340   InitializeMainThread();
 341
 342   system_monitor_.reset(new base::SystemMonitor);
 343   hi_res_timer_manager_.reset(new HighResolutionTimerManager);
 344   network_change_notifier_.reset(net::NetworkChangeNotifier::Create());
 345   audio_manager_.reset(media::AudioManager::Create());
 346
 347 #if !defined(OS_IOS)
 348   // Start tracing to a file if needed.
 349   if (base::debug::TraceLog::GetInstance()->IsEnabled()) {
 350     TraceControllerImpl::GetInstance()->InitStartupTracing(
 351         parsed_command_line_);
 352   }
 353
 354   online_state_observer_.reset(new BrowserOnlineStateObserver);
 355
 356   // Prior to any processing happening on the io thread, we create the
 357   // plugin service as it is predominantly used from the io thread,
 358   // but must be created on the main thread. The service ctor is
 359   // inexpensive and does not invoke the io_thread() accessor.
 360   PluginService::GetInstance()->Init();
 361 #endif  // !defined(OS_IOS)
 362
 363 #if defined(OS_WIN)
 364   system_message_window_.reset(new SystemMessageWindowWin);
 365 #endif
 366
 367   if (parts_.get())
 368     parts_->PostMainMessageLoopStart();
 369
 370 #if defined(OS_ANDROID)
 371   SurfaceTexturePeer::InitInstance(new SurfaceTexturePeerBrowserImpl(
 372       parameters_.command_line.HasSwitch(
 373           switches::kMediaPlayerInRenderProcess)));
 374   DataFetcherImplAndroid::Init(base::android::AttachCurrentThread());
 375 #endif
 376 }
 377
 378 void BrowserMainLoop::CreateThreads() {
 379   if (parts_.get())
 380     result_code_ = parts_->PreCreateThreads();
 381
 382 #if !defined(OS_IOS) && (!defined(GOOGLE_CHROME_BUILD) || defined(OS_ANDROID))
 383   // Single-process is an unsupported and not fully tested mode, so
 384   // don't enable it for official Chrome builds (except on Android).
 385   if (parsed_command_line_.HasSwitch(switches::kSingleProcess))
 386     RenderProcessHost::SetRunRendererInProcess(true);
 387 #endif
 388
 389   if (result_code_ > 0)
 390     return;
 391
 392   base::Thread::Options default_options;
 393   base::Thread::Options io_message_loop_options;
 394   io_message_loop_options.message_loop_type = MessageLoop::TYPE_IO;
 395   base::Thread::Options ui_message_loop_options;
 396   ui_message_loop_options.message_loop_type = MessageLoop::TYPE_UI;
 397
 398   // Start threads in the order they occur in the BrowserThread::ID
 399   // enumeration, except for BrowserThread::UI which is the main
 400   // thread.
 401   //
 402   // Must be size_t so we can increment it.
 403   for (size_t thread_id = BrowserThread::UI + 1;
 404        thread_id < BrowserThread::ID_COUNT;
 405        ++thread_id) {
 406     scoped_ptr<BrowserProcessSubThread>* thread_to_start = NULL;
 407     base::Thread::Options* options = &default_options;
 408
 409     switch (thread_id) {
 410       case BrowserThread::DB:
 411         thread_to_start = &db_thread_;
 412         break;
 413       case BrowserThread::WEBKIT_DEPRECATED:
 414         // Special case as WebKitThread is a separate
 415         // type.  |thread_to_start| is not used in this case.
 416         break;
 417       case BrowserThread::FILE_USER_BLOCKING:
 418         thread_to_start = &file_user_blocking_thread_;
 419         break;
 420       case BrowserThread::FILE:
 421         thread_to_start = &file_thread_;
 422 #if defined(OS_WIN)
 423         // On Windows, the FILE thread needs to be have a UI message loop
 424         // which pumps messages in such a way that Google Update can
 425         // communicate back to us.
 426         options = &ui_message_loop_options;
 427 #else
 428         options = &io_message_loop_options;
 429 #endif
 430         break;
 431       case BrowserThread::PROCESS_LAUNCHER:
 432         thread_to_start = &process_launcher_thread_;
 433         break;
 434       case BrowserThread::CACHE:
 435         thread_to_start = &cache_thread_;
 436         options = &io_message_loop_options;
 437         break;
 438       case BrowserThread::IO:
 439         thread_to_start = &io_thread_;
 440         options = &io_message_loop_options;
 441         break;
 442       case BrowserThread::UI:
 443       case BrowserThread::ID_COUNT:
 444       default:
 445         NOTREACHED();
 446         break;
 447     }
 448
 449     BrowserThread::ID id = static_cast<BrowserThread::ID>(thread_id);
 450
 451     if (thread_id == BrowserThread::WEBKIT_DEPRECATED) {
 452 #if !defined(OS_IOS)
 453       webkit_thread_.reset(new WebKitThread);
 454       webkit_thread_->Initialize();
 455 #endif
 456     } else if (thread_to_start) {
 457       (*thread_to_start).reset(new BrowserProcessSubThread(id));
 458       (*thread_to_start)->StartWithOptions(*options);
 459     } else {
 460       NOTREACHED();
 461     }
 462   }
 463
 464   BrowserThreadsStarted();
 465
 466   if (parts_.get())
 467     parts_->PreMainMessageLoopRun();
 468
 469   // If the UI thread blocks, the whole UI is unresponsive.
 470   // Do not allow disk IO from the UI thread.
 471   base::ThreadRestrictions::SetIOAllowed(false);
 472   base::ThreadRestrictions::DisallowWaiting();
 473 }
 474
 475 void BrowserMainLoop::RunMainMessageLoopParts() {
 476   TRACE_EVENT_BEGIN_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
 477
 478   bool ran_main_loop = false;
 479   if (parts_.get())
 480     ran_main_loop = parts_->MainMessageLoopRun(&result_code_);
 481
 482   if (!ran_main_loop)
 483     MainMessageLoopRun();
 484
 485   TRACE_EVENT_END_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
 486 }
 487
 488 void BrowserMainLoop::ShutdownThreadsAndCleanUp() {
 489   // Teardown may start in PostMainMessageLoopRun, and during teardown we
 490   // need to be able to perform IO.
 491   base::ThreadRestrictions::SetIOAllowed(true);
 492   BrowserThread::PostTask(
 493       BrowserThread::IO, FROM_HERE,
 494       base::Bind(base::IgnoreResult(&base::ThreadRestrictions::SetIOAllowed),
 495                  true));
 496
 497   if (parts_.get())
 498     parts_->PostMainMessageLoopRun();
 499
 500 #if !defined(OS_IOS)
 501   // Destroying the GpuProcessHostUIShims on the UI thread posts a task to
 502   // delete related objects on the GPU thread. This must be done before
 503   // stopping the GPU thread. The GPU thread will close IPC channels to renderer
 504   // processes so this has to happen before stopping the IO thread.
 505   GpuProcessHostUIShim::DestroyAll();
 506
 507   // Cancel pending requests and prevent new requests.
 508   if (resource_dispatcher_host_.get())
 509     resource_dispatcher_host_.get()->Shutdown();
 510
 511 #if defined(USE_AURA)
 512   ImageTransportFactory::Terminate();
 513 #endif
 514   BrowserGpuChannelHostFactory::Terminate();
 515
 516   // The device monitors are using |system_monitor_| as dependency, so delete
 517   // them before |system_monitor_| goes away.
 518   // On Mac and windows, the monitor needs to be destroyed on the same thread
 519   // as they were created. On Linux, the monitor will be deleted when IO thread
 520   // goes away.
 521 #if defined(OS_WIN)
 522   system_message_window_.reset();
 523 #elif defined(OS_MACOSX)
 524   device_monitor_mac_.reset();
 525 #endif
 526 #endif  // !defined(OS_IOS)
 527
 528   // Must be size_t so we can subtract from it.
 529   for (size_t thread_id = BrowserThread::ID_COUNT - 1;
 530        thread_id >= (BrowserThread::UI + 1);
 531        --thread_id) {
 532     // Find the thread object we want to stop. Looping over all valid
 533     // BrowserThread IDs and DCHECKing on a missing case in the switch
 534     // statement helps avoid a mismatch between this code and the
 535     // BrowserThread::ID enumeration.
 536     //
 537     // The destruction order is the reverse order of occurrence in the
 538     // BrowserThread::ID list. The rationale for the order is as
 539     // follows (need to be filled in a bit):
 540     //
 541     //
 542     // - The IO thread is the only user of the CACHE thread.
 543     //
 544     // - The PROCESS_LAUNCHER thread must be stopped after IO in case
 545     //   the IO thread posted a task to terminate a process on the
 546     //   process launcher thread.
 547     //
 548     // - (Not sure why FILE needs to stop before WEBKIT.)
 549     //
 550     // - The WEBKIT thread (which currently is the responsibility of
 551     //   the embedder to stop, by destroying ResourceDispatcherHost
 552     //   before the DB thread is stopped)
 553     //
 554     // - (Not sure why DB stops last.)
 555     scoped_ptr<BrowserProcessSubThread>* thread_to_stop = NULL;
 556     switch (thread_id) {
 557       case BrowserThread::DB:
 558         thread_to_stop = &db_thread_;
 559         break;
 560       case BrowserThread::WEBKIT_DEPRECATED:
 561         // Special case as WebKitThread is a separate
 562         // type.  |thread_to_stop| is not used in this case.
 563
 564         // Need to destroy ResourceDispatcherHost before PluginService
 565         // and since it caches a pointer to it.
 566         resource_dispatcher_host_.reset();
 567         break;
 568       case BrowserThread::FILE_USER_BLOCKING:
 569         thread_to_stop = &file_user_blocking_thread_;
 570         break;
 571       case BrowserThread::FILE:
 572         thread_to_stop = &file_thread_;
 573
 574 #if !defined(OS_IOS)
 575         // Clean up state that lives on or uses the file_thread_ before
 576         // it goes away.
 577         if (resource_dispatcher_host_.get())
 578           resource_dispatcher_host_.get()->save_file_manager()->Shutdown();
 579 #endif  // !defined(OS_IOS)
 580         break;
 581       case BrowserThread::PROCESS_LAUNCHER:
 582         thread_to_stop = &process_launcher_thread_;
 583         break;
 584       case BrowserThread::CACHE:
 585         thread_to_stop = &cache_thread_;
 586         break;
 587       case BrowserThread::IO:
 588         thread_to_stop = &io_thread_;
 589         break;
 590       case BrowserThread::UI:
 591       case BrowserThread::ID_COUNT:
 592       default:
 593         NOTREACHED();
 594         break;
 595     }
 596
 597     BrowserThread::ID id = static_cast<BrowserThread::ID>(thread_id);
 598
 599     if (id == BrowserThread::WEBKIT_DEPRECATED) {
 600 #if !defined(OS_IOS)
 601       webkit_thread_.reset();
 602 #endif
 603     } else if (thread_to_stop) {
 604       thread_to_stop->reset();
 605     } else {
 606       NOTREACHED();
 607     }
 608   }
 609
 610   // Close the blocking I/O pool after the other threads. Other threads such
 611   // as the I/O thread may need to schedule work like closing files or flushing
 612   // data during shutdown, so the blocking pool needs to be available. There
 613   // may also be slow operations pending that will blcok shutdown, so closing
 614   // it here (which will block until required operations are complete) gives
 615   // more head start for those operations to finish.
 616   BrowserThreadImpl::ShutdownThreadPool();
 617
 618 #if !defined(OS_IOS)
 619   // Must happen after the I/O thread is shutdown since this class lives on the
 620   // I/O thread and isn't threadsafe.
 621   GamepadService::GetInstance()->Terminate();
 622 #endif  // !defined(OS_IOS)
 623
 624   if (parts_.get())
 625     parts_->PostDestroyThreads();
 626 }
 627
 628 void BrowserMainLoop::InitializeMainThread() {
 629   const char* kThreadName = "CrBrowserMain";
 630   base::PlatformThread::SetName(kThreadName);
 631   if (main_message_loop_.get())
 632     main_message_loop_->set_thread_name(kThreadName);
 633
 634   // Register the main thread by instantiating it, but don't call any methods.
 635   main_thread_.reset(new BrowserThreadImpl(BrowserThread::UI,
 636                                            MessageLoop::current()));
 637 }
 638
 639
 640 void BrowserMainLoop::BrowserThreadsStarted() {
 641 #if !defined(OS_IOS)
 642   HistogramSynchronizer::GetInstance();
 643
 644   BrowserGpuChannelHostFactory::Initialize();
 645 #if defined(USE_AURA)
 646   ImageTransportFactory::Initialize();
 647 #endif
 648
 649 #if defined(OS_LINUX)
 650   device_monitor_linux_.reset(new DeviceMonitorLinux());
 651 #elif defined(OS_MACOSX)
 652   device_monitor_mac_.reset(new DeviceMonitorMac());
 653 #endif
 654
 655   // RDH needs the IO thread to be created.
 656   resource_dispatcher_host_.reset(new ResourceDispatcherHostImpl());
 657
 658   // MediaStreamManager needs the IO thread to be created.
 659   media_stream_manager_.reset(new MediaStreamManager(audio_manager_.get()));
 660
 661   // Initialize the GpuDataManager before we set up the MessageLoops because
 662   // otherwise we'll trigger the assertion about doing IO on the UI thread.
 663   GpuDataManagerImpl::GetInstance()->Initialize();
 664 #endif  // !OS_IOS
 665
 666 #if defined(ENABLE_INPUT_SPEECH)
 667   speech_recognition_manager_.reset(new SpeechRecognitionManagerImpl());
 668 #endif
 669
 670 #if !defined(OS_IOS)
 671   // Alert the clipboard class to which threads are allowed to access the
 672   // clipboard:
 673   std::vector<base::PlatformThreadId> allowed_clipboard_threads;
 674   // The current thread is the UI thread.
 675   allowed_clipboard_threads.push_back(base::PlatformThread::CurrentId());
 676 #if defined(OS_WIN)
 677   // On Windows, clipboards are also used on the File or IO threads.
 678   allowed_clipboard_threads.push_back(file_thread_->thread_id());
 679   allowed_clipboard_threads.push_back(io_thread_->thread_id());
 680 #endif
 681   ui::Clipboard::SetAllowedThreads(allowed_clipboard_threads);
 682
 683   // When running the GPU thread in-process, avoid optimistically starting it
 684   // since creating the GPU thread races against creation of the one-and-only
 685   // ChildProcess instance which is created by the renderer thread.
 686   if (GpuDataManagerImpl::GetInstance()->GpuAccessAllowed() &&
 687       content::IsForceCompositingModeEnabled() &&
 688       !parsed_command_line_.HasSwitch(switches::kDisableGpuProcessPrelaunch) &&
 689       !parsed_command_line_.HasSwitch(switches::kSingleProcess) &&
 690       !parsed_command_line_.HasSwitch(switches::kInProcessGPU)) {
 691     TRACE_EVENT_INSTANT0("gpu", "Post task to launch GPU process");
 692     BrowserThread::PostTask(
 693         BrowserThread::IO, FROM_HERE, base::Bind(
 694             base::IgnoreResult(&GpuProcessHost::Get),
 695             GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED,
 696             CAUSE_FOR_GPU_LAUNCH_BROWSER_STARTUP));
 697   }
 698 #endif  // !defined(OS_IOS)
 699 }
 700
 701 void BrowserMainLoop::InitializeToolkit() {
 702   // TODO(evan): this function is rather subtle, due to the variety
 703   // of intersecting ifdefs we have.  To keep it easy to follow, there
 704   // are no #else branches on any #ifs.
 705   // TODO(stevenjb): Move platform specific code into platform specific Parts
 706   // (Need to add InitializeToolkit stage to BrowserParts).
 707 #if defined(OS_LINUX) || defined(OS_OPENBSD)
 708   // Glib type system initialization. Needed at least for gconf,
 709   // used in net/proxy/proxy_config_service_linux.cc. Most likely
 710   // this is superfluous as gtk_init() ought to do this. It's
 711   // definitely harmless, so retained as a reminder of this
 712   // requirement for gconf.
 713   g_type_init();
 714
 715 #if !defined(USE_AURA)
 716   gfx::GtkInitFromCommandLine(parsed_command_line_);
 717 #endif
 718
 719   SetUpGLibLogHandler();
 720 #endif
 721
 722 #if defined(TOOLKIT_GTK)
 723   // It is important for this to happen before the first run dialog, as it
 724   // styles the dialog as well.
 725   gfx::InitRCStyles();
 726 #endif
 727
 728 #if defined(OS_WIN)
 729   // Init common control sex.
 730   INITCOMMONCONTROLSEX config;
 731   config.dwSize = sizeof(config);
 732   config.dwICC = ICC_WIN95_CLASSES;
 733   if (!InitCommonControlsEx(&config))
 734     LOG_GETLASTERROR(FATAL);
 735 #endif
 736
 737   if (parts_.get())
 738     parts_->ToolkitInitialized();
 739 }
 740
 741 void BrowserMainLoop::MainMessageLoopRun() {
 742 #if defined(OS_ANDROID)
 743   // Android's main message loop is the Java message loop.
 744   NOTREACHED();
 745 #else
 746   DCHECK_EQ(MessageLoop::TYPE_UI, MessageLoop::current()->type());
 747   if (parameters_.ui_task)
 748     MessageLoopForUI::current()->PostTask(FROM_HERE, *parameters_.ui_task);
 749
 750   base::RunLoop run_loop;
 751   run_loop.Run();
 752 #endif
 753 }
 754
 755 }  // namespace content