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