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