- Implement Isolate.ping.

runtime/vm/message.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_H_
 #define VM_MESSAGE_H_
 
 #include "platform/assert.h"
 #include "vm/globals.h"
 
@@ skipping 12 matching lines @@
     kFirstPriority = 0,
     kNumPriorities = 2,
   } Priority;
 
   // Values defining the type of OOB messages. OOB messages can only be
   // fixed length arrays where the first element is a Smi with one of the
   // valid values below.
   typedef enum {
     kIllegalOOB = 0,
     kServiceOOBMsg = 1,
-    kIsolateLibOOBMsg = 2
+    kIsolateLibOOBMsg = 2,
+    kDelayedIsolateLibOOBMsg = 3,
   } OOBMsgTag;
 
   // A port number which is never used.
   static const Dart_Port kIllegalPort = 0;
 
   // A new message to be sent between two isolates. The data handed to this
   // message will be disposed by calling free() once the message object is
   // being destructed (after delivery or when the receiving port is closed).
   Message(Dart_Port dest_port,
           uint8_t* data,
           intptr_t len,
           Priority priority,
           Dart_Port delivery_failure_port = kIllegalPort)
       : next_(NULL),
         dest_port_(dest_port),
         delivery_failure_port_(delivery_failure_port),
         data_(data),
         len_(len),
         priority_(priority) {
-    ASSERT(dest_port != kIllegalPort);
     ASSERT((priority == kNormalPriority) ||
            (delivery_failure_port == kIllegalPort));
   }
   ~Message() {
     ASSERT(delivery_failure_port_ == kIllegalPort);
     free(data_);
   }
 
   Dart_Port dest_port() const { return dest_port_; }
   uint8_t* data() const { return data_; }
@@ skipping 16 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(Message);
 };
 
 // There is a message queue per isolate.
 class MessageQueue {
  public:
   MessageQueue();
   ~MessageQueue();
 
-  void Enqueue(Message* msg);
+  void Enqueue(Message* msg, bool before_events);
 
   // Gets the next message from the message queue or NULL if no
   // message is available.  This function will not block.
   Message* Dequeue();
 
   bool IsEmpty() { return head_ == NULL; }
 
   // Clear all messages from the message queue.
   void Clear();
 
  private:
   Message* head_;
   Message* tail_;
 
   DISALLOW_COPY_AND_ASSIGN(MessageQueue);
 };
 
 }  // namespace dart
 
 #endif  // VM_MESSAGE_H_