Updated a few comments

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 1940 matching lines @@
   v8::Local<v8::Function> fun =
       v8::Function::Cast(*api_exec_state->Get(fun_name));
   v8::TryCatch try_catch;
   v8::Local<v8::Object> cmd_processor =
       v8::Object::Cast(*fun->Call(api_exec_state, 0, NULL));
   if (try_catch.HasCaught()) {
     PrintLn(try_catch.Exception());
     return;
   }
 
-  // Notify the debugger that a debug event has occurred.
+  // Notify the debugger that a debug event has occurred unless auto continue is
+  // active in which case no event is send.
   if (!auto_continue) {
     bool success = SetEventJSONFromEvent(event_data);
     if (!success) {
       // If failed to notify debugger just continue running.
       return;
     }
   }
 
   // Process requests from the debugger.
   host_running_ = false;
@@ skipping 72 matching lines @@
     v8::String::Value val(response);
     Vector<uint16_t> str(reinterpret_cast<uint16_t*>(*val),
                         response->Length());
 
     // Set host_running_ correctly for nested debugger evaluations.
     host_running_ = running;
 
     // Return the result.
     SendMessage(str);
 
-    // Return from debug event processing is VM should be running.
+    // Return from debug event processing if either the VM is put into the
+    // runnning state (through a continue command) or auto continue is active
+    // and there are no more commands queued.
     if (running || (auto_continue && !HasCommands())) {
       return;
     }
   }
 }
 
 
 // Puts a command coming from the public API on the queue.  Creates
 // a copy of the command string managed by the debugger.  Up to this
 // point, the command data was managed by the API client.  Called
@@ skipping 103 matching lines @@
 }
 
 
 void LockingMessageQueue::Clear() {
   ScopedLock sl(lock_);
   queue_.Clear();
 }
 
 
 } }  // namespace v8::internal