Avoid to run dart code during paused_on_exit

runtime/vm/message_handler.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/message_handler.h"
 
 #include "vm/dart.h"
 #include "vm/lockers.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
@@ skipping 328 matching lines @@
       status = HandleMessages(&ml, false, false);
       if (ShouldPauseOnStart(status)) {
         // Still paused.
         ASSERT(oob_queue_->IsEmpty());
         task_ = NULL;  // No task in queue.
         return;
       } else {
         PausedOnStartLocked(&ml, false);
       }
     }
+    if (is_paused_on_exit()) {
+      status = paused_on_exit_status_;
+    }
 #endif
 
     if (status == kOK) {
       if (start_callback_) {
         // Initialize the message handler by running its start function,
         // if we have one.  For an isolate, this will run the isolate's
         // main() function.
         //
         // Release the monitor_ temporarily while we call the start callback.
         ml.Exit();
@@ skipping 15 matching lines @@
 #if !defined(PRODUCT)
       if (ShouldPauseOnExit(status)) {
         if (!is_paused_on_exit()) {
           if (FLAG_trace_service_pause_events) {
             OS::PrintErr(
                 "Isolate %s paused before exiting. "
                 "Use the Observatory to release it.\n",
                 name());
           }
           PausedOnExitLocked(&ml, true);
-          // More messages may have come in while we released the monitor.
-          status = HandleMessages(&ml, false, false);
+          paused_on_exit_status_ = status;
         }
+        // More messages may have come in while we released the monitor.
+        status = HandleMessages(&ml, false, false);
         if (ShouldPauseOnExit(status)) {
           // Still paused.
           ASSERT(oob_queue_->IsEmpty());
           task_ = NULL;  // No task in queue.
           return;
         } else {
           PausedOnExitLocked(&ml, false);
         }
       }
 #endif  // !defined(PRODUCT)
@@ skipping 173 matching lines @@
   ASSERT(handler != NULL);
   handler_->oob_message_handling_allowed_ = false;
 }
 
 MessageHandler::AcquiredQueues::~AcquiredQueues() {
   ASSERT(handler_ != NULL);
   handler_->oob_message_handling_allowed_ = true;
 }
 
 }  // namespace dart