content/utility/in_process_utility_thread.cc

   1 // Copyright 2013 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/utility/in_process_utility_thread.h"
   6
   7 #include "base/location.h"
   8 #include "base/single_thread_task_runner.h"
   9 #include "base/thread_task_runner_handle.h"
  10 #include "content/child/child_process.h"
  11 #include "content/utility/utility_thread_impl.h"
  12
  13 namespace content {
  14
  15 // We want to ensure there's only one utility thread running at a time, as there
  16 // are many globals used in the utility process.
  17 static base::LazyInstance<base::Lock> g_one_utility_thread_lock;
  18
  19 InProcessUtilityThread::InProcessUtilityThread(
  20     const InProcessChildThreadParams& params)
  21     : Thread("Chrome_InProcUtilityThread"), params_(params) {
  22 }
  23
  24 InProcessUtilityThread::~InProcessUtilityThread() {
  25   // Wait till in-process utility thread finishes clean up.
  26   bool previous_value = base::ThreadRestrictions::SetIOAllowed(true);
  27   Stop();
  28   base::ThreadRestrictions::SetIOAllowed(previous_value);
  29 }
  30
  31 void InProcessUtilityThread::Init() {
  32   // We need to return right away or else the main thread that started us will
  33   // hang.
  34   base::ThreadTaskRunnerHandle::Get()->PostTask(
  35       FROM_HERE, base::Bind(&InProcessUtilityThread::InitInternal,
  36                             base::Unretained(this)));
  37 }
  38
  39 void InProcessUtilityThread::CleanUp() {
  40   child_process_.reset();
  41
  42   // See comment in RendererMainThread.
  43   SetThreadWasQuitProperly(true);
  44   g_one_utility_thread_lock.Get().Release();
  45 }
  46
  47 void InProcessUtilityThread::InitInternal() {
  48   g_one_utility_thread_lock.Get().Acquire();
  49   child_process_.reset(new ChildProcess());
  50   child_process_->set_main_thread(new UtilityThreadImpl(params_));
  51 }
  52
  53 base::Thread* CreateInProcessUtilityThread(
  54     const InProcessChildThreadParams& params) {
  55   return new InProcessUtilityThread(params);
  56 }
  57
  58 }  // namespace content