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