Add locker support to DebugMessageDispatchHandler

src/debug.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2420 matching lines @@
       client_data);
   Logger::DebugTag("Put command on command_queue.");
   command_queue_.Put(message);
   command_received_->Signal();
 
   // Set the debug command break flag to have the command processed.
   if (!Debug::InDebugger()) {
     StackGuard::DebugCommand();
   }
 
-  if (Debugger::debug_message_dispatch_handler_ != NULL) {
-    Debugger::debug_message_dispatch_handler_();
+  {
+    // TODO: Lock only optionally
+    LockParameters lock_params;
+    Locker lock(&lock_params);
+    if (lock_params.successfully_relaied) {
+    } else {
+      if (Debugger::debug_message_dispatch_handler_ != NULL) {
+        Debugger::debug_message_dispatch_handler_();
+      }
+    }
   }
 }
 
 
 bool Debugger::HasCommands() {
   return !command_queue_.IsEmpty();
 }
 
 
 bool Debugger::IsDebuggerActive() {
@@ skipping 289 matching lines @@
 
 
 void LockingCommandMessageQueue::Clear() {
   ScopedLock sl(lock_);
   queue_.Clear();
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal