Terminate event handler thread on isolate shutdown.

runtime/bin/isolate_data.h

+// Copyright (c) 2012, 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 BIN_ISOLATE_DATA_H_
+#define BIN_ISOLATE_DATA_H_
+
+#include "platform/globals.h"
+
+// Forward declaration.
+class EventHandler;
+
+// Data associated with every isolate in the standalone VM
+// embedding. This is used to free external resources for each isolate
+// when the isolate shuts down.
+class IsolateData {
+ public:
+  IsolateData() : event_handler(NULL) {}
+
+  EventHandler* event_handler;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(IsolateData);
+};
+
+#endif  // BIN_ISOLATE_DATA_H_