blob: 08c2075f7faef7542f94dc26911e6a202ab93eda [file] [log] [blame]
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/child/child_thread_impl.h"
#include <signal.h>
#include <string>
#include "base/allocator/allocator_extension.h"
#include "base/base_switches.h"
#include "base/basictypes.h"
#include "base/command_line.h"
#include "base/debug/leak_annotations.h"
#include "base/debug/profiler.h"
#include "base/lazy_instance.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/message_loop/timer_slack.h"
#include "base/metrics/field_trial.h"
#include "base/process/process.h"
#include "base/process/process_handle.h"
#include "base/single_thread_task_runner.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/synchronization/condition_variable.h"
#include "base/synchronization/lock.h"
#include "base/thread_task_runner_handle.h"
#include "base/threading/thread_local.h"
#include "base/tracked_objects.h"
#include "components/tracing/child_trace_message_filter.h"
#include "content/child/child_discardable_shared_memory_manager.h"
#include "content/child/child_gpu_memory_buffer_manager.h"
#include "content/child/child_histogram_message_filter.h"
#include "content/child/child_process.h"
#include "content/child/child_resource_message_filter.h"
#include "content/child/child_shared_bitmap_manager.h"
#include "content/child/fileapi/file_system_dispatcher.h"
#include "content/child/fileapi/webfilesystem_impl.h"
#include "content/child/geofencing/geofencing_message_filter.h"
#include "content/child/mojo/mojo_application.h"
#include "content/child/notifications/notification_dispatcher.h"
#include "content/child/power_monitor_broadcast_source.h"
#include "content/child/push_messaging/push_dispatcher.h"
#include "content/child/quota_dispatcher.h"
#include "content/child/quota_message_filter.h"
#include "content/child/resource_dispatcher.h"
#include "content/child/service_worker/service_worker_message_filter.h"
#include "content/child/thread_safe_sender.h"
#include "content/child/websocket_dispatcher.h"
#include "content/common/child_process_messages.h"
#include "content/common/in_process_child_thread_params.h"
#include "content/public/common/content_switches.h"
#include "ipc/attachment_broker_unprivileged.h"
#include "ipc/ipc_logging.h"
#include "ipc/ipc_switches.h"
#include "ipc/ipc_sync_channel.h"
#include "ipc/ipc_sync_message_filter.h"
#include "ipc/mojo/ipc_channel_mojo.h"
#if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
#include "third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h"
#endif
#if defined(OS_MACOSX)
#include "content/child/child_io_surface_manager_mac.h"
#endif
#if defined(USE_OZONE)
#include "ui/ozone/public/client_native_pixmap_factory.h"
#endif
#if defined(OS_WIN)
#include "ipc/attachment_broker_unprivileged_win.h"
#endif
using tracked_objects::ThreadData;
namespace content {
namespace {
// How long to wait for a connection to the browser process before giving up.
const int kConnectionTimeoutS = 15;
base::LazyInstance<base::ThreadLocalPointer<ChildThreadImpl> > g_lazy_tls =
LAZY_INSTANCE_INITIALIZER;
// This isn't needed on Windows because there the sandbox's job object
// terminates child processes automatically. For unsandboxed processes (i.e.
// plugins), PluginThread has EnsureTerminateMessageFilter.
#if defined(OS_POSIX)
#if defined(ADDRESS_SANITIZER) || defined(LEAK_SANITIZER) || \
defined(MEMORY_SANITIZER) || defined(THREAD_SANITIZER) || \
defined(UNDEFINED_SANITIZER)
// A thread delegate that waits for |duration| and then exits the process with
// _exit(0).
class WaitAndExitDelegate : public base::PlatformThread::Delegate {
public:
explicit WaitAndExitDelegate(base::TimeDelta duration)
: duration_(duration) {}
void ThreadMain() override {
base::PlatformThread::Sleep(duration_);
_exit(0);
}
private:
const base::TimeDelta duration_;
DISALLOW_COPY_AND_ASSIGN(WaitAndExitDelegate);
};
bool CreateWaitAndExitThread(base::TimeDelta duration) {
scoped_ptr<WaitAndExitDelegate> delegate(new WaitAndExitDelegate(duration));
const bool thread_created =
base::PlatformThread::CreateNonJoinable(0, delegate.get());
if (!thread_created)
return false;
// A non joinable thread has been created. The thread will either terminate
// the process or will be terminated by the process. Therefore, keep the
// delegate object alive for the lifetime of the process.
WaitAndExitDelegate* leaking_delegate = delegate.release();
ANNOTATE_LEAKING_OBJECT_PTR(leaking_delegate);
ignore_result(leaking_delegate);
return true;
}
#endif
class SuicideOnChannelErrorFilter : public IPC::MessageFilter {
public:
// IPC::MessageFilter
void OnChannelError() override {
// For renderer/worker processes:
// On POSIX, at least, one can install an unload handler which loops
// forever and leave behind a renderer process which eats 100% CPU forever.
//
// This is because the terminate signals (FrameMsg_BeforeUnload and the
// error from the IPC sender) are routed to the main message loop but never
// processed (because that message loop is stuck in V8).
//
// One could make the browser SIGKILL the renderers, but that leaves open a
// large window where a browser failure (or a user, manually terminating
// the browser because "it's stuck") will leave behind a process eating all
// the CPU.
//
// So, we install a filter on the sender so that we can process this event
// here and kill the process.
base::debug::StopProfiling();
#if defined(ADDRESS_SANITIZER) || defined(LEAK_SANITIZER) || \
defined(MEMORY_SANITIZER) || defined(THREAD_SANITIZER) || \
defined(UNDEFINED_SANITIZER)
// Some sanitizer tools rely on exit handlers (e.g. to run leak detection,
// or dump code coverage data to disk). Instead of exiting the process
// immediately, we give it 60 seconds to run exit handlers.
CHECK(CreateWaitAndExitThread(base::TimeDelta::FromSeconds(60)));
#if defined(LEAK_SANITIZER)
// Invoke LeakSanitizer early to avoid detecting shutdown-only leaks. If
// leaks are found, the process will exit here.
__lsan_do_leak_check();
#endif
#else
_exit(0);
#endif
}
protected:
~SuicideOnChannelErrorFilter() override {}
};
#endif // OS(POSIX)
#if defined(OS_MACOSX)
class IOSurfaceManagerFilter : public IPC::MessageFilter {
public:
// Overridden from IPC::MessageFilter:
bool OnMessageReceived(const IPC::Message& message) override {
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(IOSurfaceManagerFilter, message)
IPC_MESSAGE_HANDLER(ChildProcessMsg_SetIOSurfaceManagerToken,
OnSetIOSurfaceManagerToken)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
return handled;
}
protected:
~IOSurfaceManagerFilter() override {}
void OnSetIOSurfaceManagerToken(const IOSurfaceManagerToken& token) {
ChildIOSurfaceManager::GetInstance()->set_token(token);
}
};
#endif
#if defined(USE_OZONE)
class ClientNativePixmapFactoryFilter : public IPC::MessageFilter {
public:
// Overridden from IPC::MessageFilter:
bool OnMessageReceived(const IPC::Message& message) override {
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(ClientNativePixmapFactoryFilter, message)
IPC_MESSAGE_HANDLER(ChildProcessMsg_InitializeClientNativePixmapFactory,
OnInitializeClientNativePixmapFactory)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
return handled;
}
protected:
~ClientNativePixmapFactoryFilter() override {}
void OnInitializeClientNativePixmapFactory(
const base::FileDescriptor& device_fd) {
ui::ClientNativePixmapFactory::GetInstance()->Initialize(
base::ScopedFD(device_fd.fd));
}
};
#endif
#if defined(OS_ANDROID)
// A class that allows for triggering a clean shutdown from another
// thread through draining the main thread's msg loop.
class QuitClosure {
public:
QuitClosure();
~QuitClosure();
void BindToMainThread();
void PostQuitFromNonMainThread();
private:
static void PostClosure(
const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
base::Closure closure);
base::Lock lock_;
base::ConditionVariable cond_var_;
base::Closure closure_;
};
QuitClosure::QuitClosure() : cond_var_(&lock_) {
}
QuitClosure::~QuitClosure() {
}
void QuitClosure::PostClosure(
const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
base::Closure closure) {
task_runner->PostTask(FROM_HERE, closure);
}
void QuitClosure::BindToMainThread() {
base::AutoLock lock(lock_);
scoped_refptr<base::SingleThreadTaskRunner> task_runner(
base::ThreadTaskRunnerHandle::Get());
base::Closure quit_closure =
base::MessageLoop::current()->QuitWhenIdleClosure();
closure_ = base::Bind(&QuitClosure::PostClosure, task_runner, quit_closure);
cond_var_.Signal();
}
void QuitClosure::PostQuitFromNonMainThread() {
base::AutoLock lock(lock_);
while (closure_.is_null())
cond_var_.Wait();
closure_.Run();
}
base::LazyInstance<QuitClosure> g_quit_closure = LAZY_INSTANCE_INITIALIZER;
#endif
} // namespace
ChildThread* ChildThread::Get() {
return ChildThreadImpl::current();
}
ChildThreadImpl::Options::Options()
: channel_name(base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
switches::kProcessChannelID)),
use_mojo_channel(false) {
}
ChildThreadImpl::Options::~Options() {
}
ChildThreadImpl::Options::Builder::Builder() {
}
ChildThreadImpl::Options::Builder&
ChildThreadImpl::Options::Builder::InBrowserProcess(
const InProcessChildThreadParams& params) {
options_.browser_process_io_runner = params.io_runner();
options_.channel_name = params.channel_name();
return *this;
}
ChildThreadImpl::Options::Builder&
ChildThreadImpl::Options::Builder::UseMojoChannel(bool use_mojo_channel) {
options_.use_mojo_channel = use_mojo_channel;
return *this;
}
ChildThreadImpl::Options::Builder&
ChildThreadImpl::Options::Builder::WithChannelName(
const std::string& channel_name) {
options_.channel_name = channel_name;
return *this;
}
ChildThreadImpl::Options::Builder&
ChildThreadImpl::Options::Builder::AddStartupFilter(
IPC::MessageFilter* filter) {
options_.startup_filters.push_back(filter);
return *this;
}
ChildThreadImpl::Options ChildThreadImpl::Options::Builder::Build() {
return options_;
}
ChildThreadImpl::ChildThreadMessageRouter::ChildThreadMessageRouter(
IPC::Sender* sender)
: sender_(sender) {}
bool ChildThreadImpl::ChildThreadMessageRouter::Send(IPC::Message* msg) {
return sender_->Send(msg);
}
ChildThreadImpl::ChildThreadImpl()
: router_(this),
channel_connected_factory_(this) {
Init(Options::Builder().Build());
}
ChildThreadImpl::ChildThreadImpl(const Options& options)
: router_(this),
browser_process_io_runner_(options.browser_process_io_runner),
channel_connected_factory_(this) {
Init(options);
}
scoped_refptr<base::SequencedTaskRunner> ChildThreadImpl::GetIOTaskRunner() {
if (IsInBrowserProcess())
return browser_process_io_runner_;
return ChildProcess::current()->io_task_runner();
}
void ChildThreadImpl::ConnectChannel(bool use_mojo_channel) {
bool create_pipe_now = true;
if (use_mojo_channel) {
VLOG(1) << "Mojo is enabled on child";
scoped_refptr<base::SequencedTaskRunner> io_task_runner = GetIOTaskRunner();
DCHECK(io_task_runner);
channel_->Init(IPC::ChannelMojo::CreateClientFactory(
io_task_runner, channel_name_, attachment_broker_.get()),
create_pipe_now);
return;
}
VLOG(1) << "Mojo is disabled on child";
channel_->Init(channel_name_, IPC::Channel::MODE_CLIENT, create_pipe_now,
attachment_broker_.get());
}
void ChildThreadImpl::Init(const Options& options) {
channel_name_ = options.channel_name;
g_lazy_tls.Pointer()->Set(this);
on_channel_error_called_ = false;
message_loop_ = base::MessageLoop::current();
#ifdef IPC_MESSAGE_LOG_ENABLED
// We must make sure to instantiate the IPC Logger *before* we create the
// channel, otherwise we can get a callback on the IO thread which creates
// the logger, and the logger does not like being created on the IO thread.
IPC::Logging::GetInstance();
#endif
channel_ =
IPC::SyncChannel::Create(this, ChildProcess::current()->io_task_runner(),
ChildProcess::current()->GetShutDownEvent());
#ifdef IPC_MESSAGE_LOG_ENABLED
if (!IsInBrowserProcess())
IPC::Logging::GetInstance()->SetIPCSender(this);
#endif
#if defined(OS_WIN)
attachment_broker_.reset(new IPC::AttachmentBrokerUnprivilegedWin());
#endif
mojo_application_.reset(new MojoApplication(GetIOTaskRunner()));
sync_message_filter_ = channel_->CreateSyncMessageFilter();
thread_safe_sender_ = new ThreadSafeSender(
message_loop_->task_runner(), sync_message_filter_.get());
resource_dispatcher_.reset(new ResourceDispatcher(
this, message_loop()->task_runner()));
websocket_dispatcher_.reset(new WebSocketDispatcher);
file_system_dispatcher_.reset(new FileSystemDispatcher());
histogram_message_filter_ = new ChildHistogramMessageFilter();
resource_message_filter_ =
new ChildResourceMessageFilter(resource_dispatcher());
service_worker_message_filter_ =
new ServiceWorkerMessageFilter(thread_safe_sender_.get());
quota_message_filter_ =
new QuotaMessageFilter(thread_safe_sender_.get());
quota_dispatcher_.reset(new QuotaDispatcher(thread_safe_sender_.get(),
quota_message_filter_.get()));
geofencing_message_filter_ =
new GeofencingMessageFilter(thread_safe_sender_.get());
notification_dispatcher_ =
new NotificationDispatcher(thread_safe_sender_.get());
push_dispatcher_ = new PushDispatcher(thread_safe_sender_.get());
channel_->AddFilter(histogram_message_filter_.get());
channel_->AddFilter(resource_message_filter_.get());
channel_->AddFilter(quota_message_filter_->GetFilter());
channel_->AddFilter(notification_dispatcher_->GetFilter());
channel_->AddFilter(push_dispatcher_->GetFilter());
channel_->AddFilter(service_worker_message_filter_->GetFilter());
channel_->AddFilter(geofencing_message_filter_->GetFilter());
if (!IsInBrowserProcess()) {
// In single process mode, browser-side tracing will cover the whole
// process including renderers.
channel_->AddFilter(new tracing::ChildTraceMessageFilter(
ChildProcess::current()->io_task_runner()));
}
// In single process mode we may already have a power monitor
if (!base::PowerMonitor::Get()) {
scoped_ptr<PowerMonitorBroadcastSource> power_monitor_source(
new PowerMonitorBroadcastSource());
channel_->AddFilter(power_monitor_source->GetMessageFilter());
power_monitor_.reset(new base::PowerMonitor(
power_monitor_source.Pass()));
}
#if defined(OS_POSIX)
// Check that --process-type is specified so we don't do this in unit tests
// and single-process mode.
if (base::CommandLine::ForCurrentProcess()->HasSwitch(switches::kProcessType))
channel_->AddFilter(new SuicideOnChannelErrorFilter());
#endif
#if defined(OS_MACOSX)
channel_->AddFilter(new IOSurfaceManagerFilter());
#endif
#if defined(USE_OZONE)
channel_->AddFilter(new ClientNativePixmapFactoryFilter());
#endif
// Add filters passed here via options.
for (auto startup_filter : options.startup_filters) {
channel_->AddFilter(startup_filter);
}
ConnectChannel(options.use_mojo_channel);
if (attachment_broker_)
attachment_broker_->DesignateBrokerCommunicationChannel(channel_.get());
int connection_timeout = kConnectionTimeoutS;
std::string connection_override =
base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
switches::kIPCConnectionTimeout);
if (!connection_override.empty()) {
int temp;
if (base::StringToInt(connection_override, &temp))
connection_timeout = temp;
}
message_loop_->task_runner()->PostDelayedTask(
FROM_HERE, base::Bind(&ChildThreadImpl::EnsureConnected,
channel_connected_factory_.GetWeakPtr()),
base::TimeDelta::FromSeconds(connection_timeout));
#if defined(OS_ANDROID)
g_quit_closure.Get().BindToMainThread();
#endif
#if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
trace_memory_controller_.reset(new base::trace_event::TraceMemoryController(
message_loop_->task_runner(), ::HeapProfilerWithPseudoStackStart,
::HeapProfilerStop, ::GetHeapProfile));
#endif
shared_bitmap_manager_.reset(
new ChildSharedBitmapManager(thread_safe_sender()));
gpu_memory_buffer_manager_.reset(
new ChildGpuMemoryBufferManager(thread_safe_sender()));
discardable_shared_memory_manager_.reset(
new ChildDiscardableSharedMemoryManager(thread_safe_sender()));
}
ChildThreadImpl::~ChildThreadImpl() {
// ChildDiscardableSharedMemoryManager has to be destroyed while
// |thread_safe_sender_| is still valid.
discardable_shared_memory_manager_.reset();
#ifdef IPC_MESSAGE_LOG_ENABLED
IPC::Logging::GetInstance()->SetIPCSender(NULL);
#endif
channel_->RemoveFilter(histogram_message_filter_.get());
channel_->RemoveFilter(sync_message_filter_.get());
// The ChannelProxy object caches a pointer to the IPC thread, so need to
// reset it as it's not guaranteed to outlive this object.
// NOTE: this also has the side-effect of not closing the main IPC channel to
// the browser process. This is needed because this is the signal that the
// browser uses to know that this process has died, so we need it to be alive
// until this process is shut down, and the OS closes the handle
// automatically. We used to watch the object handle on Windows to do this,
// but it wasn't possible to do so on POSIX.
channel_->ClearIPCTaskRunner();
g_lazy_tls.Pointer()->Set(NULL);
}
void ChildThreadImpl::Shutdown() {
// Delete objects that hold references to blink so derived classes can
// safely shutdown blink in their Shutdown implementation.
file_system_dispatcher_.reset();
quota_dispatcher_.reset();
WebFileSystemImpl::DeleteThreadSpecificInstance();
}
void ChildThreadImpl::OnChannelConnected(int32 peer_pid) {
channel_connected_factory_.InvalidateWeakPtrs();
}
void ChildThreadImpl::OnChannelError() {
set_on_channel_error_called(true);
base::MessageLoop::current()->Quit();
}
bool ChildThreadImpl::Send(IPC::Message* msg) {
DCHECK(base::MessageLoop::current() == message_loop());
if (!channel_) {
delete msg;
return false;
}
return channel_->Send(msg);
}
#if defined(OS_WIN)
void ChildThreadImpl::PreCacheFont(const LOGFONT& log_font) {
Send(new ChildProcessHostMsg_PreCacheFont(log_font));
}
void ChildThreadImpl::ReleaseCachedFonts() {
Send(new ChildProcessHostMsg_ReleaseCachedFonts());
}
#endif
IPC::AttachmentBroker* ChildThreadImpl::GetAttachmentBroker() {
return attachment_broker_.get();
}
MessageRouter* ChildThreadImpl::GetRouter() {
DCHECK(base::MessageLoop::current() == message_loop());
return &router_;
}
scoped_ptr<base::SharedMemory> ChildThreadImpl::AllocateSharedMemory(
size_t buf_size) {
DCHECK(base::MessageLoop::current() == message_loop());
return AllocateSharedMemory(buf_size, this);
}
// static
scoped_ptr<base::SharedMemory> ChildThreadImpl::AllocateSharedMemory(
size_t buf_size,
IPC::Sender* sender) {
scoped_ptr<base::SharedMemory> shared_buf;
#if defined(OS_WIN)
shared_buf.reset(new base::SharedMemory);
if (!shared_buf->CreateAnonymous(buf_size)) {
NOTREACHED();
return NULL;
}
#else
// On POSIX, we need to ask the browser to create the shared memory for us,
// since this is blocked by the sandbox.
base::SharedMemoryHandle shared_mem_handle;
if (sender->Send(new ChildProcessHostMsg_SyncAllocateSharedMemory(
buf_size, &shared_mem_handle))) {
if (base::SharedMemory::IsHandleValid(shared_mem_handle)) {
shared_buf.reset(new base::SharedMemory(shared_mem_handle, false));
} else {
NOTREACHED() << "Browser failed to allocate shared memory";
return NULL;
}
} else {
NOTREACHED() << "Browser allocation request message failed";
return NULL;
}
#endif
return shared_buf;
}
bool ChildThreadImpl::OnMessageReceived(const IPC::Message& msg) {
if (mojo_application_->OnMessageReceived(msg))
return true;
// Resource responses are sent to the resource dispatcher.
if (resource_dispatcher_->OnMessageReceived(msg))
return true;
if (websocket_dispatcher_->OnMessageReceived(msg))
return true;
if (file_system_dispatcher_->OnMessageReceived(msg))
return true;
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(ChildThreadImpl, msg)
IPC_MESSAGE_HANDLER(ChildProcessMsg_Shutdown, OnShutdown)
#if defined(IPC_MESSAGE_LOG_ENABLED)
IPC_MESSAGE_HANDLER(ChildProcessMsg_SetIPCLoggingEnabled,
OnSetIPCLoggingEnabled)
#endif
IPC_MESSAGE_HANDLER(ChildProcessMsg_SetProfilerStatus,
OnSetProfilerStatus)
IPC_MESSAGE_HANDLER(ChildProcessMsg_GetChildProfilerData,
OnGetChildProfilerData)
IPC_MESSAGE_HANDLER(ChildProcessMsg_ProfilingPhaseCompleted,
OnProfilingPhaseCompleted)
IPC_MESSAGE_HANDLER(ChildProcessMsg_SetProcessBackgrounded,
OnProcessBackgrounded)
#if defined(USE_TCMALLOC)
IPC_MESSAGE_HANDLER(ChildProcessMsg_GetTcmallocStats, OnGetTcmallocStats)
#endif
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
if (handled)
return true;
if (msg.routing_id() == MSG_ROUTING_CONTROL)
return OnControlMessageReceived(msg);
return router_.OnMessageReceived(msg);
}
bool ChildThreadImpl::OnControlMessageReceived(const IPC::Message& msg) {
return false;
}
void ChildThreadImpl::OnProcessBackgrounded(bool backgrounded) {
// Set timer slack to maximum on main thread when in background.
base::TimerSlack timer_slack = base::TIMER_SLACK_NONE;
if (backgrounded)
timer_slack = base::TIMER_SLACK_MAXIMUM;
base::MessageLoop::current()->SetTimerSlack(timer_slack);
}
void ChildThreadImpl::OnShutdown() {
base::MessageLoop::current()->Quit();
}
#if defined(IPC_MESSAGE_LOG_ENABLED)
void ChildThreadImpl::OnSetIPCLoggingEnabled(bool enable) {
if (enable)
IPC::Logging::GetInstance()->Enable();
else
IPC::Logging::GetInstance()->Disable();
}
#endif // IPC_MESSAGE_LOG_ENABLED
void ChildThreadImpl::OnSetProfilerStatus(ThreadData::Status status) {
ThreadData::InitializeAndSetTrackingStatus(status);
}
void ChildThreadImpl::OnGetChildProfilerData(int sequence_number,
int current_profiling_phase) {
tracked_objects::ProcessDataSnapshot process_data;
ThreadData::Snapshot(current_profiling_phase, &process_data);
Send(
new ChildProcessHostMsg_ChildProfilerData(sequence_number, process_data));
}
void ChildThreadImpl::OnProfilingPhaseCompleted(int profiling_phase) {
ThreadData::OnProfilingPhaseCompleted(profiling_phase);
}
#if defined(USE_TCMALLOC)
void ChildThreadImpl::OnGetTcmallocStats() {
std::string result;
char buffer[1024 * 32];
base::allocator::GetStats(buffer, sizeof(buffer));
result.append(buffer);
Send(new ChildProcessHostMsg_TcmallocStats(result));
}
#endif
ChildThreadImpl* ChildThreadImpl::current() {
return g_lazy_tls.Pointer()->Get();
}
#if defined(OS_ANDROID)
// The method must NOT be called on the child thread itself.
// It may block the child thread if so.
void ChildThreadImpl::ShutdownThread() {
DCHECK(!ChildThreadImpl::current()) <<
"this method should NOT be called from child thread itself";
g_quit_closure.Get().PostQuitFromNonMainThread();
}
#endif
void ChildThreadImpl::OnProcessFinalRelease() {
if (on_channel_error_called_) {
base::MessageLoop::current()->Quit();
return;
}
// The child process shutdown sequence is a request response based mechanism,
// where we send out an initial feeler request to the child process host
// instance in the browser to verify if it's ok to shutdown the child process.
// The browser then sends back a response if it's ok to shutdown. This avoids
// race conditions if the process refcount is 0 but there's an IPC message
// inflight that would addref it.
Send(new ChildProcessHostMsg_ShutdownRequest);
}
void ChildThreadImpl::EnsureConnected() {
VLOG(0) << "ChildThreadImpl::EnsureConnected()";
base::Process::Current().Terminate(0, false);
}
bool ChildThreadImpl::IsInBrowserProcess() const {
return browser_process_io_runner_;
}
} // namespace content