content/child/child_thread_impl.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/child/child_thread_impl.h"
   6
   7 #include <signal.h>
   8
   9 #include <string>
  10
  11 #include "base/allocator/allocator_extension.h"
  12 #include "base/base_switches.h"
  13 #include "base/basictypes.h"
  14 #include "base/command_line.h"
  15 #include "base/debug/leak_annotations.h"
  16 #include "base/debug/profiler.h"
  17 #include "base/lazy_instance.h"
  18 #include "base/location.h"
  19 #include "base/logging.h"
  20 #include "base/message_loop/timer_slack.h"
  21 #include "base/metrics/field_trial.h"
  22 #include "base/process/process.h"
  23 #include "base/process/process_handle.h"
  24 #include "base/single_thread_task_runner.h"
  25 #include "base/strings/string_number_conversions.h"
  26 #include "base/strings/string_util.h"
  27 #include "base/synchronization/condition_variable.h"
  28 #include "base/synchronization/lock.h"
  29 #include "base/thread_task_runner_handle.h"
  30 #include "base/threading/thread_local.h"
  31 #include "base/trace_event/memory_dump_manager.h"
  32 #include "base/tracked_objects.h"
  33 #include "components/tracing/child_trace_message_filter.h"
  34 #include "content/child/bluetooth/bluetooth_message_filter.h"
  35 #include "content/child/child_discardable_shared_memory_manager.h"
  36 #include "content/child/child_gpu_memory_buffer_manager.h"
  37 #include "content/child/child_histogram_message_filter.h"
  38 #include "content/child/child_process.h"
  39 #include "content/child/child_resource_message_filter.h"
  40 #include "content/child/child_shared_bitmap_manager.h"
  41 #include "content/child/fileapi/file_system_dispatcher.h"
  42 #include "content/child/fileapi/webfilesystem_impl.h"
  43 #include "content/child/geofencing/geofencing_message_filter.h"
  44 #include "content/child/mojo/mojo_application.h"
  45 #include "content/child/navigator_connect/navigator_connect_dispatcher.h"
  46 #include "content/child/notifications/notification_dispatcher.h"
  47 #include "content/child/power_monitor_broadcast_source.h"
  48 #include "content/child/push_messaging/push_dispatcher.h"
  49 #include "content/child/quota_dispatcher.h"
  50 #include "content/child/quota_message_filter.h"
  51 #include "content/child/resource_dispatcher.h"
  52 #include "content/child/service_worker/service_worker_message_filter.h"
  53 #include "content/child/thread_safe_sender.h"
  54 #include "content/child/websocket_dispatcher.h"
  55 #include "content/common/child_process_messages.h"
  56 #include "content/common/in_process_child_thread_params.h"
  57 #include "content/public/common/content_switches.h"
  58 #include "ipc/ipc_logging.h"
  59 #include "ipc/ipc_switches.h"
  60 #include "ipc/ipc_sync_channel.h"
  61 #include "ipc/ipc_sync_message_filter.h"
  62 #include "ipc/mojo/ipc_channel_mojo.h"
  63
  64 #if defined(OS_ANDROID)
  65 #include "base/thread_task_runner_handle.h"
  66 #endif
  67
  68 #if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
  69 #include "third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h"
  70 #endif
  71
  72 #if defined(OS_MACOSX)
  73 #include "content/child/child_io_surface_manager_mac.h"
  74 #endif
  75
  76 using tracked_objects::ThreadData;
  77
  78 namespace content {
  79 namespace {
  80
  81 // How long to wait for a connection to the browser process before giving up.
  82 const int kConnectionTimeoutS = 15;
  83
  84 base::LazyInstance<base::ThreadLocalPointer<ChildThreadImpl> > g_lazy_tls =
  85     LAZY_INSTANCE_INITIALIZER;
  86
  87 // This isn't needed on Windows because there the sandbox's job object
  88 // terminates child processes automatically. For unsandboxed processes (i.e.
  89 // plugins), PluginThread has EnsureTerminateMessageFilter.
  90 #if defined(OS_POSIX)
  91
  92 #if defined(ADDRESS_SANITIZER) || defined(LEAK_SANITIZER) || \
  93     defined(MEMORY_SANITIZER) || defined(THREAD_SANITIZER) || \
  94     defined(UNDEFINED_SANITIZER)
  95 // A thread delegate that waits for |duration| and then exits the process with
  96 // _exit(0).
  97 class WaitAndExitDelegate : public base::PlatformThread::Delegate {
  98  public:
  99   explicit WaitAndExitDelegate(base::TimeDelta duration)
 100       : duration_(duration) {}
 101
 102   void ThreadMain() override {
 103     base::PlatformThread::Sleep(duration_);
 104     _exit(0);
 105   }
 106
 107  private:
 108   const base::TimeDelta duration_;
 109   DISALLOW_COPY_AND_ASSIGN(WaitAndExitDelegate);
 110 };
 111
 112 bool CreateWaitAndExitThread(base::TimeDelta duration) {
 113   scoped_ptr<WaitAndExitDelegate> delegate(new WaitAndExitDelegate(duration));
 114
 115   const bool thread_created =
 116       base::PlatformThread::CreateNonJoinable(0, delegate.get());
 117   if (!thread_created)
 118     return false;
 119
 120   // A non joinable thread has been created. The thread will either terminate
 121   // the process or will be terminated by the process. Therefore, keep the
 122   // delegate object alive for the lifetime of the process.
 123   WaitAndExitDelegate* leaking_delegate = delegate.release();
 124   ANNOTATE_LEAKING_OBJECT_PTR(leaking_delegate);
 125   ignore_result(leaking_delegate);
 126   return true;
 127 }
 128 #endif
 129
 130 class SuicideOnChannelErrorFilter : public IPC::MessageFilter {
 131  public:
 132   // IPC::MessageFilter
 133   void OnChannelError() override {
 134     // For renderer/worker processes:
 135     // On POSIX, at least, one can install an unload handler which loops
 136     // forever and leave behind a renderer process which eats 100% CPU forever.
 137     //
 138     // This is because the terminate signals (ViewMsg_ShouldClose and the error
 139     // from the IPC sender) are routed to the main message loop but never
 140     // processed (because that message loop is stuck in V8).
 141     //
 142     // One could make the browser SIGKILL the renderers, but that leaves open a
 143     // large window where a browser failure (or a user, manually terminating
 144     // the browser because "it's stuck") will leave behind a process eating all
 145     // the CPU.
 146     //
 147     // So, we install a filter on the sender so that we can process this event
 148     // here and kill the process.
 149     base::debug::StopProfiling();
 150 #if defined(ADDRESS_SANITIZER) || defined(LEAK_SANITIZER) || \
 151     defined(MEMORY_SANITIZER) || defined(THREAD_SANITIZER) || \
 152     defined(UNDEFINED_SANITIZER)
 153     // Some sanitizer tools rely on exit handlers (e.g. to run leak detection,
 154     // or dump code coverage data to disk). Instead of exiting the process
 155     // immediately, we give it 60 seconds to run exit handlers.
 156     CHECK(CreateWaitAndExitThread(base::TimeDelta::FromSeconds(60)));
 157 #if defined(LEAK_SANITIZER)
 158     // Invoke LeakSanitizer early to avoid detecting shutdown-only leaks. If
 159     // leaks are found, the process will exit here.
 160     __lsan_do_leak_check();
 161 #endif
 162 #else
 163     _exit(0);
 164 #endif
 165   }
 166
 167  protected:
 168   ~SuicideOnChannelErrorFilter() override {}
 169 };
 170
 171 #endif  // OS(POSIX)
 172
 173 #if defined(OS_ANDROID)
 174 // A class that allows for triggering a clean shutdown from another
 175 // thread through draining the main thread's msg loop.
 176 class QuitClosure {
 177  public:
 178   QuitClosure();
 179   ~QuitClosure();
 180
 181   void BindToMainThread();
 182   void PostQuitFromNonMainThread();
 183
 184  private:
 185   static void PostClosure(
 186       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
 187       base::Closure closure);
 188
 189   base::Lock lock_;
 190   base::ConditionVariable cond_var_;
 191   base::Closure closure_;
 192 };
 193
 194 QuitClosure::QuitClosure() : cond_var_(&lock_) {
 195 }
 196
 197 QuitClosure::~QuitClosure() {
 198 }
 199
 200 void QuitClosure::PostClosure(
 201     const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
 202     base::Closure closure) {
 203   task_runner->PostTask(FROM_HERE, closure);
 204 }
 205
 206 void QuitClosure::BindToMainThread() {
 207   base::AutoLock lock(lock_);
 208   scoped_refptr<base::SingleThreadTaskRunner> task_runner(
 209       base::ThreadTaskRunnerHandle::Get());
 210   base::Closure quit_closure =
 211       base::MessageLoop::current()->QuitWhenIdleClosure();
 212   closure_ = base::Bind(&QuitClosure::PostClosure, task_runner, quit_closure);
 213   cond_var_.Signal();
 214 }
 215
 216 void QuitClosure::PostQuitFromNonMainThread() {
 217   base::AutoLock lock(lock_);
 218   while (closure_.is_null())
 219     cond_var_.Wait();
 220
 221   closure_.Run();
 222 }
 223
 224 base::LazyInstance<QuitClosure> g_quit_closure = LAZY_INSTANCE_INITIALIZER;
 225 #endif
 226
 227 }  // namespace
 228
 229 ChildThread* ChildThread::Get() {
 230   return ChildThreadImpl::current();
 231 }
 232
 233 ChildThreadImpl::Options::Options()
 234     : channel_name(base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
 235           switches::kProcessChannelID)),
 236       use_mojo_channel(false) {
 237 }
 238
 239 ChildThreadImpl::Options::~Options() {
 240 }
 241
 242 ChildThreadImpl::Options::Builder::Builder() {
 243 }
 244
 245 ChildThreadImpl::Options::Builder&
 246 ChildThreadImpl::Options::Builder::InBrowserProcess(
 247     const InProcessChildThreadParams& params) {
 248   options_.browser_process_io_runner = params.io_runner();
 249   options_.channel_name = params.channel_name();
 250   return *this;
 251 }
 252
 253 ChildThreadImpl::Options::Builder&
 254 ChildThreadImpl::Options::Builder::UseMojoChannel(bool use_mojo_channel) {
 255   options_.use_mojo_channel = use_mojo_channel;
 256   return *this;
 257 }
 258
 259 ChildThreadImpl::Options::Builder&
 260 ChildThreadImpl::Options::Builder::WithChannelName(
 261     const std::string& channel_name) {
 262   options_.channel_name = channel_name;
 263   return *this;
 264 }
 265
 266 ChildThreadImpl::Options::Builder&
 267 ChildThreadImpl::Options::Builder::AddStartupFilter(
 268     IPC::MessageFilter* filter) {
 269   options_.startup_filters.push_back(filter);
 270   return *this;
 271 }
 272
 273 ChildThreadImpl::Options ChildThreadImpl::Options::Builder::Build() {
 274   return options_;
 275 }
 276
 277 ChildThreadImpl::ChildThreadMessageRouter::ChildThreadMessageRouter(
 278     IPC::Sender* sender)
 279     : sender_(sender) {}
 280
 281 bool ChildThreadImpl::ChildThreadMessageRouter::Send(IPC::Message* msg) {
 282   return sender_->Send(msg);
 283 }
 284
 285 ChildThreadImpl::ChildThreadImpl()
 286     : router_(this),
 287       channel_connected_factory_(this) {
 288   Init(Options::Builder().Build());
 289 }
 290
 291 ChildThreadImpl::ChildThreadImpl(const Options& options)
 292     : router_(this),
 293       browser_process_io_runner_(options.browser_process_io_runner),
 294       channel_connected_factory_(this) {
 295   Init(options);
 296 }
 297
 298 scoped_refptr<base::SequencedTaskRunner> ChildThreadImpl::GetIOTaskRunner() {
 299   if (IsInBrowserProcess())
 300     return browser_process_io_runner_;
 301   return ChildProcess::current()->io_task_runner();
 302 }
 303
 304 void ChildThreadImpl::ConnectChannel(bool use_mojo_channel) {
 305   bool create_pipe_now = true;
 306   if (use_mojo_channel) {
 307     VLOG(1) << "Mojo is enabled on child";
 308     scoped_refptr<base::SequencedTaskRunner> io_task_runner = GetIOTaskRunner();
 309     DCHECK(io_task_runner);
 310     channel_->Init(IPC::ChannelMojo::CreateClientFactory(
 311                        nullptr, io_task_runner, channel_name_),
 312                    create_pipe_now);
 313     return;
 314   }
 315
 316   VLOG(1) << "Mojo is disabled on child";
 317   channel_->Init(channel_name_, IPC::Channel::MODE_CLIENT, create_pipe_now);
 318 }
 319
 320 void ChildThreadImpl::Init(const Options& options) {
 321   channel_name_ = options.channel_name;
 322
 323   g_lazy_tls.Pointer()->Set(this);
 324   on_channel_error_called_ = false;
 325   message_loop_ = base::MessageLoop::current();
 326 #ifdef IPC_MESSAGE_LOG_ENABLED
 327   // We must make sure to instantiate the IPC Logger *before* we create the
 328   // channel, otherwise we can get a callback on the IO thread which creates
 329   // the logger, and the logger does not like being created on the IO thread.
 330   IPC::Logging::GetInstance();
 331 #endif
 332   channel_ =
 333       IPC::SyncChannel::Create(this, ChildProcess::current()->io_task_runner(),
 334                                ChildProcess::current()->GetShutDownEvent());
 335 #ifdef IPC_MESSAGE_LOG_ENABLED
 336   if (!IsInBrowserProcess())
 337     IPC::Logging::GetInstance()->SetIPCSender(this);
 338 #endif
 339
 340   mojo_application_.reset(new MojoApplication(GetIOTaskRunner()));
 341
 342   sync_message_filter_ =
 343       new IPC::SyncMessageFilter(ChildProcess::current()->GetShutDownEvent());
 344   thread_safe_sender_ = new ThreadSafeSender(
 345       message_loop_->task_runner(), sync_message_filter_.get());
 346
 347   resource_dispatcher_.reset(new ResourceDispatcher(
 348       this, message_loop()->task_runner()));
 349   websocket_dispatcher_.reset(new WebSocketDispatcher);
 350   file_system_dispatcher_.reset(new FileSystemDispatcher());
 351
 352   histogram_message_filter_ = new ChildHistogramMessageFilter();
 353   resource_message_filter_ =
 354       new ChildResourceMessageFilter(resource_dispatcher());
 355
 356   service_worker_message_filter_ =
 357       new ServiceWorkerMessageFilter(thread_safe_sender_.get());
 358
 359   quota_message_filter_ =
 360       new QuotaMessageFilter(thread_safe_sender_.get());
 361   quota_dispatcher_.reset(new QuotaDispatcher(thread_safe_sender_.get(),
 362                                               quota_message_filter_.get()));
 363   geofencing_message_filter_ =
 364       new GeofencingMessageFilter(thread_safe_sender_.get());
 365   bluetooth_message_filter_ =
 366       new BluetoothMessageFilter(thread_safe_sender_.get());
 367   notification_dispatcher_ =
 368       new NotificationDispatcher(thread_safe_sender_.get());
 369   push_dispatcher_ = new PushDispatcher(thread_safe_sender_.get());
 370   navigator_connect_dispatcher_ =
 371       new NavigatorConnectDispatcher(thread_safe_sender_.get());
 372
 373   channel_->AddFilter(histogram_message_filter_.get());
 374   channel_->AddFilter(sync_message_filter_.get());
 375   channel_->AddFilter(resource_message_filter_.get());
 376   channel_->AddFilter(quota_message_filter_->GetFilter());
 377   channel_->AddFilter(notification_dispatcher_->GetFilter());
 378   channel_->AddFilter(push_dispatcher_->GetFilter());
 379   channel_->AddFilter(service_worker_message_filter_->GetFilter());
 380   channel_->AddFilter(geofencing_message_filter_->GetFilter());
 381   channel_->AddFilter(bluetooth_message_filter_->GetFilter());
 382   channel_->AddFilter(navigator_connect_dispatcher_->GetFilter());
 383
 384   if (!IsInBrowserProcess()) {
 385     // In single process mode, browser-side tracing will cover the whole
 386     // process including renderers.
 387     channel_->AddFilter(new tracing::ChildTraceMessageFilter(
 388         ChildProcess::current()->io_task_runner()));
 389   }
 390
 391   // In single process mode we may already have a power monitor
 392   if (!base::PowerMonitor::Get()) {
 393     scoped_ptr<PowerMonitorBroadcastSource> power_monitor_source(
 394       new PowerMonitorBroadcastSource());
 395     channel_->AddFilter(power_monitor_source->GetMessageFilter());
 396
 397     power_monitor_.reset(new base::PowerMonitor(
 398         power_monitor_source.Pass()));
 399   }
 400
 401 #if defined(OS_POSIX)
 402   // Check that --process-type is specified so we don't do this in unit tests
 403   // and single-process mode.
 404   if (base::CommandLine::ForCurrentProcess()->HasSwitch(switches::kProcessType))
 405     channel_->AddFilter(new SuicideOnChannelErrorFilter());
 406 #endif
 407
 408   // Add filters passed here via options.
 409   for (auto startup_filter : options.startup_filters) {
 410     channel_->AddFilter(startup_filter);
 411   }
 412
 413   ConnectChannel(options.use_mojo_channel);
 414
 415   int connection_timeout = kConnectionTimeoutS;
 416   std::string connection_override =
 417       base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
 418           switches::kIPCConnectionTimeout);
 419   if (!connection_override.empty()) {
 420     int temp;
 421     if (base::StringToInt(connection_override, &temp))
 422       connection_timeout = temp;
 423   }
 424
 425   message_loop_->task_runner()->PostDelayedTask(
 426       FROM_HERE, base::Bind(&ChildThreadImpl::EnsureConnected,
 427                             channel_connected_factory_.GetWeakPtr()),
 428       base::TimeDelta::FromSeconds(connection_timeout));
 429
 430 #if defined(OS_ANDROID)
 431   g_quit_closure.Get().BindToMainThread();
 432 #endif
 433
 434 #if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
 435   trace_memory_controller_.reset(new base::trace_event::TraceMemoryController(
 436       message_loop_->task_runner(), ::HeapProfilerWithPseudoStackStart,
 437       ::HeapProfilerStop, ::GetHeapProfile));
 438 #endif
 439
 440   base::trace_event::MemoryDumpManager::GetInstance()->Initialize();
 441
 442   shared_bitmap_manager_.reset(
 443       new ChildSharedBitmapManager(thread_safe_sender()));
 444
 445   gpu_memory_buffer_manager_.reset(
 446       new ChildGpuMemoryBufferManager(thread_safe_sender()));
 447
 448   discardable_shared_memory_manager_.reset(
 449       new ChildDiscardableSharedMemoryManager(thread_safe_sender()));
 450 }
 451
 452 ChildThreadImpl::~ChildThreadImpl() {
 453   // ChildDiscardableSharedMemoryManager has to be destroyed while
 454   // |thread_safe_sender_| is still valid.
 455   discardable_shared_memory_manager_.reset();
 456
 457 #ifdef IPC_MESSAGE_LOG_ENABLED
 458   IPC::Logging::GetInstance()->SetIPCSender(NULL);
 459 #endif
 460
 461   channel_->RemoveFilter(histogram_message_filter_.get());
 462   channel_->RemoveFilter(sync_message_filter_.get());
 463
 464   // The ChannelProxy object caches a pointer to the IPC thread, so need to
 465   // reset it as it's not guaranteed to outlive this object.
 466   // NOTE: this also has the side-effect of not closing the main IPC channel to
 467   // the browser process.  This is needed because this is the signal that the
 468   // browser uses to know that this process has died, so we need it to be alive
 469   // until this process is shut down, and the OS closes the handle
 470   // automatically.  We used to watch the object handle on Windows to do this,
 471   // but it wasn't possible to do so on POSIX.
 472   channel_->ClearIPCTaskRunner();
 473   g_lazy_tls.Pointer()->Set(NULL);
 474 }
 475
 476 void ChildThreadImpl::Shutdown() {
 477   // Delete objects that hold references to blink so derived classes can
 478   // safely shutdown blink in their Shutdown implementation.
 479   file_system_dispatcher_.reset();
 480   quota_dispatcher_.reset();
 481   WebFileSystemImpl::DeleteThreadSpecificInstance();
 482 }
 483
 484 void ChildThreadImpl::OnChannelConnected(int32 peer_pid) {
 485   channel_connected_factory_.InvalidateWeakPtrs();
 486 }
 487
 488 void ChildThreadImpl::OnChannelError() {
 489   set_on_channel_error_called(true);
 490   base::MessageLoop::current()->Quit();
 491 }
 492
 493 bool ChildThreadImpl::Send(IPC::Message* msg) {
 494   DCHECK(base::MessageLoop::current() == message_loop());
 495   if (!channel_) {
 496     delete msg;
 497     return false;
 498   }
 499
 500   return channel_->Send(msg);
 501 }
 502
 503 #if defined(OS_WIN)
 504 void ChildThreadImpl::PreCacheFont(const LOGFONT& log_font) {
 505   Send(new ChildProcessHostMsg_PreCacheFont(log_font));
 506 }
 507
 508 void ChildThreadImpl::ReleaseCachedFonts() {
 509   Send(new ChildProcessHostMsg_ReleaseCachedFonts());
 510 }
 511 #endif
 512
 513 MessageRouter* ChildThreadImpl::GetRouter() {
 514   DCHECK(base::MessageLoop::current() == message_loop());
 515   return &router_;
 516 }
 517
 518 scoped_ptr<base::SharedMemory> ChildThreadImpl::AllocateSharedMemory(
 519     size_t buf_size) {
 520   DCHECK(base::MessageLoop::current() == message_loop());
 521   return AllocateSharedMemory(buf_size, this);
 522 }
 523
 524 // static
 525 scoped_ptr<base::SharedMemory> ChildThreadImpl::AllocateSharedMemory(
 526     size_t buf_size,
 527     IPC::Sender* sender) {
 528   scoped_ptr<base::SharedMemory> shared_buf;
 529 #if defined(OS_WIN)
 530   shared_buf.reset(new base::SharedMemory);
 531   if (!shared_buf->CreateAnonymous(buf_size)) {
 532     NOTREACHED();
 533     return NULL;
 534   }
 535 #else
 536   // On POSIX, we need to ask the browser to create the shared memory for us,
 537   // since this is blocked by the sandbox.
 538   base::SharedMemoryHandle shared_mem_handle;
 539   if (sender->Send(new ChildProcessHostMsg_SyncAllocateSharedMemory(
 540                            buf_size, &shared_mem_handle))) {
 541     if (base::SharedMemory::IsHandleValid(shared_mem_handle)) {
 542       shared_buf.reset(new base::SharedMemory(shared_mem_handle, false));
 543     } else {
 544       NOTREACHED() << "Browser failed to allocate shared memory";
 545       return NULL;
 546     }
 547   } else {
 548     NOTREACHED() << "Browser allocation request message failed";
 549     return NULL;
 550   }
 551 #endif
 552   return shared_buf;
 553 }
 554
 555 bool ChildThreadImpl::OnMessageReceived(const IPC::Message& msg) {
 556   if (mojo_application_->OnMessageReceived(msg))
 557     return true;
 558
 559   // Resource responses are sent to the resource dispatcher.
 560   if (resource_dispatcher_->OnMessageReceived(msg))
 561     return true;
 562   if (websocket_dispatcher_->OnMessageReceived(msg))
 563     return true;
 564   if (file_system_dispatcher_->OnMessageReceived(msg))
 565     return true;
 566
 567   bool handled = true;
 568   IPC_BEGIN_MESSAGE_MAP(ChildThreadImpl, msg)
 569     IPC_MESSAGE_HANDLER(ChildProcessMsg_Shutdown, OnShutdown)
 570 #if defined(IPC_MESSAGE_LOG_ENABLED)
 571     IPC_MESSAGE_HANDLER(ChildProcessMsg_SetIPCLoggingEnabled,
 572                         OnSetIPCLoggingEnabled)
 573 #endif
 574     IPC_MESSAGE_HANDLER(ChildProcessMsg_SetProfilerStatus,
 575                         OnSetProfilerStatus)
 576     IPC_MESSAGE_HANDLER(ChildProcessMsg_GetChildProfilerData,
 577                         OnGetChildProfilerData)
 578     IPC_MESSAGE_HANDLER(ChildProcessMsg_ProfilingPhaseCompleted,
 579                         OnProfilingPhaseCompleted)
 580     IPC_MESSAGE_HANDLER(ChildProcessMsg_SetProcessBackgrounded,
 581                         OnProcessBackgrounded)
 582 #if defined(USE_TCMALLOC)
 583     IPC_MESSAGE_HANDLER(ChildProcessMsg_GetTcmallocStats, OnGetTcmallocStats)
 584 #endif
 585 #if defined(OS_MACOSX)
 586     IPC_MESSAGE_HANDLER(ChildProcessMsg_SetIOSurfaceManagerToken,
 587                         OnSetIOSurfaceManagerToken)
 588 #endif
 589     IPC_MESSAGE_UNHANDLED(handled = false)
 590   IPC_END_MESSAGE_MAP()
 591
 592   if (handled)
 593     return true;
 594
 595   if (msg.routing_id() == MSG_ROUTING_CONTROL)
 596     return OnControlMessageReceived(msg);
 597
 598   return router_.OnMessageReceived(msg);
 599 }
 600
 601 bool ChildThreadImpl::OnControlMessageReceived(const IPC::Message& msg) {
 602   return false;
 603 }
 604
 605 void ChildThreadImpl::OnShutdown() {
 606   base::MessageLoop::current()->Quit();
 607 }
 608
 609 #if defined(IPC_MESSAGE_LOG_ENABLED)
 610 void ChildThreadImpl::OnSetIPCLoggingEnabled(bool enable) {
 611   if (enable)
 612     IPC::Logging::GetInstance()->Enable();
 613   else
 614     IPC::Logging::GetInstance()->Disable();
 615 }
 616 #endif  //  IPC_MESSAGE_LOG_ENABLED
 617
 618 void ChildThreadImpl::OnSetProfilerStatus(ThreadData::Status status) {
 619   ThreadData::InitializeAndSetTrackingStatus(status);
 620 }
 621
 622 void ChildThreadImpl::OnGetChildProfilerData(int sequence_number,
 623                                              int current_profiling_phase) {
 624   tracked_objects::ProcessDataSnapshot process_data;
 625   ThreadData::Snapshot(current_profiling_phase, &process_data);
 626
 627   Send(
 628       new ChildProcessHostMsg_ChildProfilerData(sequence_number, process_data));
 629 }
 630
 631 void ChildThreadImpl::OnProfilingPhaseCompleted(int profiling_phase) {
 632   ThreadData::OnProfilingPhaseCompleted(profiling_phase);
 633 }
 634
 635 #if defined(USE_TCMALLOC)
 636 void ChildThreadImpl::OnGetTcmallocStats() {
 637   std::string result;
 638   char buffer[1024 * 32];
 639   base::allocator::GetStats(buffer, sizeof(buffer));
 640   result.append(buffer);
 641   Send(new ChildProcessHostMsg_TcmallocStats(result));
 642 }
 643 #endif
 644
 645 #if defined(OS_MACOSX)
 646 void ChildThreadImpl::OnSetIOSurfaceManagerToken(
 647     const IOSurfaceManagerToken& token) {
 648   ChildIOSurfaceManager::GetInstance()->set_token(token);
 649 }
 650 #endif
 651
 652 ChildThreadImpl* ChildThreadImpl::current() {
 653   return g_lazy_tls.Pointer()->Get();
 654 }
 655
 656 #if defined(OS_ANDROID)
 657 // The method must NOT be called on the child thread itself.
 658 // It may block the child thread if so.
 659 void ChildThreadImpl::ShutdownThread() {
 660   DCHECK(!ChildThreadImpl::current()) <<
 661       "this method should NOT be called from child thread itself";
 662   g_quit_closure.Get().PostQuitFromNonMainThread();
 663 }
 664 #endif
 665
 666 void ChildThreadImpl::OnProcessFinalRelease() {
 667   if (on_channel_error_called_) {
 668     base::MessageLoop::current()->Quit();
 669     return;
 670   }
 671
 672   // The child process shutdown sequence is a request response based mechanism,
 673   // where we send out an initial feeler request to the child process host
 674   // instance in the browser to verify if it's ok to shutdown the child process.
 675   // The browser then sends back a response if it's ok to shutdown. This avoids
 676   // race conditions if the process refcount is 0 but there's an IPC message
 677   // inflight that would addref it.
 678   Send(new ChildProcessHostMsg_ShutdownRequest);
 679 }
 680
 681 void ChildThreadImpl::EnsureConnected() {
 682   VLOG(0) << "ChildThreadImpl::EnsureConnected()";
 683   base::Process::Current().Terminate(0, false);
 684 }
 685
 686 bool ChildThreadImpl::IsInBrowserProcess() const {
 687   return browser_process_io_runner_;
 688 }
 689
 690 void ChildThreadImpl::OnProcessBackgrounded(bool background) {
 691   // Set timer slack to maximum on main thread when in background.
 692   base::TimerSlack timer_slack = base::TIMER_SLACK_NONE;
 693   if (background)
 694     timer_slack = base::TIMER_SLACK_MAXIMUM;
 695   base::MessageLoop::current()->SetTimerSlack(timer_slack);
 696 }
 697
 698 }  // namespace content