A64: Synchronize with r16489.

src/debug-agent.h

Index: src/debug-agent.h
diff --git a/src/debug-agent.h b/src/debug-agent.h
index 61151900f0141b505d2e2a6bc5f9020aeb4dc79e..3f22715a1644474afdbf5de69667ec979a834aee 100644
--- a/src/debug-agent.h
+++ b/src/debug-agent.h
@@ -48,9 +48,9 @@ class DebuggerAgent: public Thread {
         isolate_(Isolate::Current()),
         name_(StrDup(name)), port_(port),
         server_(OS::CreateSocket()), terminate_(false),
-        session_access_(OS::CreateMutex()), session_(NULL),
-        terminate_now_(OS::CreateSemaphore(0)),
-        listening_(OS::CreateSemaphore(0)) {
+        session_(NULL),
+        terminate_now_(0),
+        listening_(0) {
     ASSERT(isolate_->debugger_agent_instance() == NULL);
     isolate_->set_debugger_agent_instance(this);
   }
@@ -76,10 +76,10 @@ class DebuggerAgent: public Thread {
   int port_;  // Port to use for the agent.
   Socket* server_;  // Server socket for listen/accept.
   bool terminate_;  // Termination flag.
-  Mutex* session_access_;  // Mutex guarging access to session_.
+  RecursiveMutex session_access_;  // Mutex guarding access to session_.
   DebuggerAgentSession* session_;  // Current active session if any.
-  Semaphore* terminate_now_;  // Semaphore to signal termination.
-  Semaphore* listening_;
+  Semaphore terminate_now_;  // Semaphore to signal termination.
+  Semaphore listening_;
 
   friend class DebuggerAgentSession;
   friend void DebuggerAgentMessageHandler(const v8::Debug::Message& message);