[Isolates] Merge from bleeding_edge to isolates, revisions 6100-6300.

src/debug.cc

Index: src/debug.cc
===================================================================
--- src/debug.cc	(revision 6941)
+++ src/debug.cc	(working copy)
@@ -59,7 +59,7 @@
       debug_info_list_(NULL),
       disable_break_(false),
       break_on_exception_(false),
-      break_on_uncaught_exception_(true),
+      break_on_uncaught_exception_(false),
       debug_break_return_(NULL),
       debug_break_slot_(NULL),
       isolate_(isolate) {
@@ -632,9 +632,6 @@
 const int Debug::kFrameDropperFrameSize = 4;
 
 
-
-
-
 void ScriptCache::Add(Handle<Script> script) {
   Isolate* isolate = Isolate::Current();
   // Create an entry in the hash map for the script.
@@ -2824,8 +2821,10 @@
   }
 
   if (Socket::Setup()) {
-    agent_ = new DebuggerAgent(isolate_, name, port);
-    agent_->Start();
+    if (agent_ == NULL) {
+      agent_ = new DebuggerAgent(isolate_, name, port);
+      agent_->Start();
+    }
     return true;
   }
 
@@ -3125,7 +3124,8 @@
 
 
 MessageDispatchHelperThread::MessageDispatchHelperThread(Isolate* isolate)
-    : Thread(isolate), sem_(OS::CreateSemaphore(0)), mutex_(OS::CreateMutex()),
+    : Thread(isolate, "v8:MsgDispHelpr"),
+      sem_(OS::CreateSemaphore(0)), mutex_(OS::CreateMutex()),
       already_signalled_(false) {
 }