Copy the thread name to the stack for debugging purposes.

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/debug/alias.h"
 #include "base/lazy_instance.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"
 #include "base/synchronization/waitable_event.h"
 
 #if defined(OS_WIN)
 #include "base/win/scoped_com_initializer.h"
 #endif
@@ skipping 147 matching lines @@
 bool Thread::GetThreadWasQuitProperly() {
   bool quit_properly = true;
 #ifndef NDEBUG
   quit_properly = lazy_tls_bool.Pointer()->Get();
 #endif
   return quit_properly;
 }
 
 void Thread::ThreadMain() {
   {
+#if defined(OS_MACOSX)
+    // Store the thread name on the stack to debug <http://crbug.com/274705>.
+    // End with a byte sequence of <EOT><BEL><NUL> to make it easier to grep in
+    // the minidump stack dump.
+    const size_t kThreadNameSize = 50;
+    char thread_name[kThreadNameSize];
+    strncpy(thread_name, name_.c_str(), kThreadNameSize);
+    thread_name[kThreadNameSize - 1] = '\0';
+    thread_name[kThreadNameSize - 2] = '\7';
+    thread_name[kThreadNameSize - 3] = '\3';
+    base::debug::Alias(thread_name);
+#endif
+
     // The message loop for this thread.
     // Allocated on the heap to centralize any leak reports at this line.
     scoped_ptr<MessageLoop> message_loop(
         new MessageLoop(startup_data_->options.message_loop_type));
 
     // Complete the initialization of our Thread object.
     thread_id_ = PlatformThread::CurrentId();
     PlatformThread::SetName(name_.c_str());
     ANNOTATE_THREAD_NAME(name_.c_str());  // Tell the name to race detector.
     message_loop->set_thread_name(name_);
@@ skipping 25 matching lines @@
 
 #if defined(OS_WIN)
     com_initializer.reset();
 #endif
 
     // Assert that MessageLoop::Quit was called by ThreadQuitHelper.
     DCHECK(GetThreadWasQuitProperly());
 
     // We can't receive messages anymore.
     message_loop_ = NULL;
+
+#if defined(OS_MACOSX)
+    base::debug::Alias(thread_name);
+#endif
   }
 }
 
 }  // namespace base