Delete NativeMessageHandler once a native port closes.

runtime/vm/message_handler.h

 // 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.
 
 #ifndef VM_MESSAGE_HANDLER_H_
 #define VM_MESSAGE_HANDLER_H_
 
 #include "vm/isolate.h"
 #include "vm/lockers.h"
 #include "vm/message.h"
@@ skipping 169 matching lines @@
   void ClosePort(Dart_Port port);
 
   // Notifies this handler that all ports are being closed.
   void CloseAllPorts();
 
   // Returns true if the handler is owned by the PortMap.
   //
   // This is used to delete handlers when their last live port is closed.
   virtual bool OwnedByPortMap() const { return false; }
 
+  // Requests deletion of this message handler when the next task
+  // completes.
+  void RequestDeletion();
+
   void increment_live_ports();
   void decrement_live_ports();
   // ------------ END PortMap API ------------
 
   // Custom message notification.  Optionally provided by subclass.
   virtual void MessageNotify(Message::Priority priority);
 
   // Handles a single message.  Provided by subclass.
   //
   // Returns true on success.
@@ skipping 34 matching lines @@
   MessageQueue* oob_queue_;
   // This flag is not thread safe and can only reliably be accessed on a single
   // thread.
   bool oob_message_handling_allowed_;
   intptr_t live_ports_;  // The number of open ports, including control ports.
   intptr_t paused_;  // The number of pause messages received.
   bool should_pause_on_start_;
   bool should_pause_on_exit_;
   bool is_paused_on_start_;
   bool is_paused_on_exit_;
+  bool delete_me_;
   int64_t paused_timestamp_;
   ThreadPool* pool_;
   ThreadPool::Task* task_;
   StartCallback start_callback_;
   EndCallback end_callback_;
   CallbackData callback_data_;
 
   DISALLOW_COPY_AND_ASSIGN(MessageHandler);
 };
 
 }  // namespace dart
 
 #endif  // VM_MESSAGE_HANDLER_H_