Switch the first thread in a child process to be the main thread...

chrome/common/child_process.cc

 // Copyright (c) 2006-2008 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 "chrome/common/child_process.h"
 
 #include "base/message_loop.h"
 #include "chrome/common/child_thread.h"
 
 ChildProcess* ChildProcess::child_process_;
 
-ChildProcess::ChildProcess(ChildThread* child_thread)
-    : child_thread_(child_thread),
-      ref_count_(0),
-      shutdown_event_(true, false) {
+ChildProcess::ChildProcess()
+    : ref_count_(0),
+      shutdown_event_(true, false),
+      io_thread_("Chrome_ChildIOThread") {
   DCHECK(!child_process_);
   child_process_ = this;
-  if (child_thread_.get())  // null in unittests.
-    child_thread_->Run();
+
+  io_thread_.StartWithOptions(base::Thread::Options(MessageLoop::TYPE_IO, 0));
 }
 
 ChildProcess::~ChildProcess() {
   DCHECK(child_process_ == this);
 
   // Signal this event before destroying the child process.  That way all
   // background threads can cleanup.
   // For example, in the renderer the RenderThread instances will be able to
   // notice shutdown before the render process begins waiting for them to exit.
   shutdown_event_.Signal();
 
-  if (child_thread_.get())
-    child_thread_->Stop();
+  // Kill the main thread object before nulling child_process_, since
+  // destruction code might depend on it.
+  main_thread_.reset();
 
   child_process_ = NULL;
 }
 
 void ChildProcess::AddRefProcess() {
-  DCHECK(!child_thread_.get() ||  // null in unittests.
-         MessageLoop::current() == child_thread_->message_loop());
+  DCHECK(!main_thread_.get() ||  // null in unittests.
+         MessageLoop::current() == main_thread_->message_loop());
   ref_count_++;
 }
 
 void ChildProcess::ReleaseProcess() {
-  DCHECK(!child_thread_.get() ||  // null in unittests.
-         MessageLoop::current() == child_thread_->message_loop());
+  DCHECK(!main_thread_.get() ||  // null in unittests.
+         MessageLoop::current() == main_thread_->message_loop());
   DCHECK(ref_count_);
   DCHECK(child_process_);
   if (--ref_count_)
     return;
 
-  if (child_thread_.get())  // null in unittests.
-    child_thread_->OnProcessFinalRelease();
+  if (main_thread_.get())  // null in unittests.
+    main_thread_->OnProcessFinalRelease();
 }
 
 base::WaitableEvent* ChildProcess::GetShutDownEvent() {
   DCHECK(child_process_);
   return &child_process_->shutdown_event_;
 }