content/renderer/in_process_renderer_thread.cc

// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/renderer/in_process_renderer_thread.h"

#include "base/message_loop/message_pump.h"
#include "base/task/current_thread.h"
#include "build/build_config.h"
#include "content/public/common/content_client.h"
#include "content/public/renderer/content_renderer_client.h"
#include "content/renderer/render_process.h"
#include "content/renderer/render_process_impl.h"
#include "content/renderer/render_thread_impl.h"
#include "third_party/blink/public/platform/platform.h"
#include "third_party/blink/public/platform/scheduler/web_thread_scheduler.h"

#if BUILDFLAG(IS_ANDROID)
#include "base/android/jni_android.h"
#endif

namespace content {

InProcessRendererThread::InProcessRendererThread(
    const InProcessChildThreadParams& params,
    int32_t renderer_client_id)
    : Thread("Chrome_InProcRendererThread",
             std::make_unique<ThreadDelegate>(this)),
      params_(params),
      renderer_client_id_(renderer_client_id) {}

InProcessRendererThread::~InProcessRendererThread() {
  Stop();
}

void InProcessRendererThread::CleanUp() {
  render_process_.reset();

  // It's a little lame to manually set this flag.  But the single process
  // RendererThread will receive the WM_QUIT.  We don't need to assert on
  // this thread, so just force the flag manually.
  // If we want to avoid this, we could create the InProcRendererThread
  // directly with _beginthreadex() rather than using the Thread class.
  // We used to set this flag in the Init function above. However there
  // other threads like WebThread which are created by this thread
  // which resets this flag. Please see Thread::StartWithOptions. Setting
  // this flag to true in Cleanup works around these problems.
  SetThreadWasQuitProperly(true);
}

base::Thread* CreateInProcessRendererThread(
    const InProcessChildThreadParams& params,
    int32_t renderer_client_id) {
  return new InProcessRendererThread(params, renderer_client_id);
}

InProcessRendererThread::ThreadDelegate::ThreadDelegate(
    InProcessRendererThread* outer)
    : outer_(outer) {}

scoped_refptr<base::SingleThreadTaskRunner>
InProcessRendererThread::ThreadDelegate::GetDefaultTaskRunner() {
  return web_thread_scheduler_->DeprecatedDefaultTaskRunner();
}

void InProcessRendererThread::ThreadDelegate::BindToCurrentThread() {
  // InProcessRendererThread doesn't support being restarted.
  DCHECK(!web_thread_scheduler_);

  // In single-process mode, we never enter the sandbox, so run the post-sandbox
  // code now.
  content::ContentRendererClient* client = GetContentClient()->renderer();
  if (client) {
    client->PostSandboxInitialized();
  }

  // Call AttachCurrentThreadWithName, before any other AttachCurrentThread()
  // calls. The latter causes Java VM to assign Thread-??? to the thread name.
  // Please note calls to AttachCurrentThreadWithName after AttachCurrentThread
  // will not change the thread name kept in Java VM.
#if BUILDFLAG(IS_ANDROID)
  base::android::AttachCurrentThreadWithName(outer_->thread_name());
  // Make sure we aren't somehow reinitialising the inprocess renderer thread on
  // Android. Temporary CHECK() to debug http://crbug.com/514141
  CHECK(!outer_->render_process_);
#endif
  blink::Platform::InitializeBlink();
  std::unique_ptr<blink::scheduler::WebThreadScheduler> main_thread_scheduler =
      blink::scheduler::WebThreadScheduler::CreateInProcessMainThreadScheduler(
          base::MessagePump::Create(base::MessagePumpType::DEFAULT));
  web_thread_scheduler_ = main_thread_scheduler.get();

  // Make sure the contract of Thread::Delegate::BindToCurrentThread() is
  // fulfilled.
  DCHECK(base::CurrentThread::IsSet());

  outer_->render_process_ = RenderProcessImpl::Create();
  // RenderThreadImpl doesn't currently support a proper shutdown sequence
  // and it's okay when we're running in multi-process mode because renderers
  // get killed by the OS. In-process mode is used for test and debug only.
  new RenderThreadImpl(outer_->params_, outer_->renderer_client_id_,
                       std::move(main_thread_scheduler));
}

}  // namespace content