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/bind.h"
8 #include "base/lazy_instance.h"
9 #include "base/location.h"
10 #include "base/single_thread_task_runner.h"
11 #include "base/threading/thread_restrictions.h"
12 #include "base/threading/thread_task_runner_handle.h"
13 #include "content/child/child_process.h"
14 #include "content/utility/utility_thread_impl.h"
15 
16 namespace content {
17 
18 // We want to ensure there's only one utility thread running at a time, as there
19 // are many globals used in the utility process.
20 static base::LazyInstance<base::Lock>::DestructorAtExit
21     g_one_utility_thread_lock;
22 
InProcessUtilityThread(const InProcessChildThreadParams & params)23 InProcessUtilityThread::InProcessUtilityThread(
24     const InProcessChildThreadParams& params)
25     : Thread("Chrome_InProcUtilityThread"), params_(params) {}
26 
~InProcessUtilityThread()27 InProcessUtilityThread::~InProcessUtilityThread() {
28   base::ScopedAllowBaseSyncPrimitivesOutsideBlockingScope allow_thread_join;
29   Stop();
30 }
31 
Init()32 void InProcessUtilityThread::Init() {
33   // We need to return right away or else the main thread that started us will
34   // hang.
35   base::ThreadTaskRunnerHandle::Get()->PostTask(
36       FROM_HERE, base::BindOnce(&InProcessUtilityThread::InitInternal,
37                                 base::Unretained(this)));
38 }
39 
CleanUp()40 void InProcessUtilityThread::CleanUp()
41     UNLOCK_FUNCTION(g_one_utility_thread_lock.Get()) {
42   child_process_.reset();
43 
44   // See comment in RendererMainThread.
45   SetThreadWasQuitProperly(true);
46   g_one_utility_thread_lock.Get().Release();
47 }
48 
InitInternal()49 void InProcessUtilityThread::InitInternal()
50     EXCLUSIVE_LOCK_FUNCTION(g_one_utility_thread_lock.Get()) {
51   g_one_utility_thread_lock.Get().Acquire();
52   child_process_.reset(new ChildProcess());
53   child_process_->set_main_thread(new UtilityThreadImpl(params_));
54 }
55 
CreateInProcessUtilityThread(const InProcessChildThreadParams & params)56 base::Thread* CreateInProcessUtilityThread(
57     const InProcessChildThreadParams& params) {
58   return new InProcessUtilityThread(params);
59 }
60 
61 }  // namespace content
62