base/threading: Lazy thread startup for pthreads

base/threading/thread.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/thread.h"
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
 #include "base/location.h"
+#include "base/profiler/scoped_tracker.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/third_party/dynamic_annotations/dynamic_annotations.h"
 #include "base/threading/thread_id_name_manager.h"
 #include "base/threading/thread_local.h"
 #include "base/threading/thread_restrictions.h"
 
 #if defined(OS_WIN)
 #include "base/win/scoped_com_initializer.h"
 #endif
 
@@ skipping 152 matching lines @@
   if (stopping_ || !message_loop_)
     return;
 
   stopping_ = true;
   task_runner()->PostTask(FROM_HERE, base::Bind(&ThreadQuitHelper));
 }
 
 PlatformThreadId Thread::GetThreadId() const {
   // If the thread is created but not started yet, wait for |id_| being ready.
   base::ThreadRestrictions::ScopedAllowWait allow_wait;
+  // TODO(toyoshim): Remove this after a few days (crbug.com/495097)
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "495097 base::Thread::GetThreadId"));
   id_event_.Wait();
   return id_;
 }
 
 bool Thread::IsRunning() const {
   // If the thread's already started (i.e. message_loop_ is non-null) and
   // not yet requested to stop (i.e. stopping_ is false) we can just return
   // true. (Note that stopping_ is touched only on the same thread that
   // starts / started the new thread so we need no locking here.)
   if (message_loop_ && !stopping_)
@@ skipping 73 matching lines @@
 
   // Assert that MessageLoop::Quit was called by ThreadQuitHelper.
   DCHECK(GetThreadWasQuitProperly());
 
   // We can't receive messages anymore.
   // (The message loop is destructed at the end of this block)
   message_loop_ = NULL;
 }
 
 }  // namespace base