Better handling of startup and shutdown of the debugger agent

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 1821 matching lines @@
   if (Socket::Setup()) {
     agent_ = new DebuggerAgent(port);
     agent_->Start();
     return true;
   }
 
   return false;
 }
 
 
+void Debugger::StopAgent() {
+  if (agent_ != NULL) {
+    agent_->Shutdown();
+    agent_->Join();
+    delete agent_;
+    agent_ = NULL;
+  }
+}
+
+
 DebugMessageThread::DebugMessageThread()
     : host_running_(true),
       command_queue_(kQueueInitialSize),
       message_queue_(kQueueInitialSize) {
   command_received_ = OS::CreateSemaphore(0);
   message_received_ = OS::CreateSemaphore(0);
 }
 
 // Does not free resources held by DebugMessageThread
 // because this cannot be done thread-safely.
@@ skipping 319 matching lines @@
 }
 
 
 void LockingMessageQueue::Clear() {
   ScopedLock sl(lock_);
   queue_.Clear();
 }
 
 
 } }  // namespace v8::internal