Lazily initialize MessageLoop for faster thread startup

base/threading/platform_thread_win.cc

 // Copyright (c) 2012 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 "base/threading/platform_thread.h"
 
 #include "base/debug/alias.h"
 #include "base/debug/profiler.h"
 #include "base/logging.h"
 #include "base/threading/thread_id_name_manager.h"
@@ skipping 90 matching lines @@
 
   ThreadParams* params = new ThreadParams;
   params->delegate = delegate;
   params->joinable = out_thread_handle != NULL;
 
   // Using CreateThread here vs _beginthreadex makes thread creation a bit
   // faster and doesn't require the loader lock to be available.  Our code will
   // have to work running on CreateThread() threads anyway, since we run code
   // on the Windows thread pool, etc.  For some background on the difference:
   //   http://www.microsoft.com/msj/1099/win32/win321099.aspx
+  PlatformThreadId thread_id;
   void* thread_handle = CreateThread(
-      NULL, stack_size, ThreadFunc, params, flags, NULL);
+      NULL, stack_size, ThreadFunc, params, flags, &thread_id);
   if (!thread_handle) {
     delete params;
     return false;
   }
 
-  if (out_thread_handle)
-    *out_thread_handle = PlatformThreadHandle(thread_handle);
-  else
+  if (out_thread_handle) {

[rvargas (doing something else), 2015/03/26 02:19:27]

nit: no need for {}

[kinuko, 2015/04/13 02:02:59]

Done.

+    *out_thread_handle = PlatformThreadHandle(thread_handle, thread_id);
+  } else {
     CloseHandle(thread_handle);
+  }
   return true;
 }
 
 }  // namespace
 
 // static
 PlatformThreadId PlatformThread::CurrentId() {
   return GetCurrentThreadId();
 }
 
@@ skipping 109 matching lines @@
     case kThreadPriority_RealtimeAudio:
       ::SetThreadPriority(handle.handle_, THREAD_PRIORITY_TIME_CRITICAL);
       break;
     default:
       NOTREACHED() << "Unknown priority.";
       break;
   }
 }
 
 }  // namespace base