Terminate event handler thread on isolate shutdown.

runtime/bin/isolate_data.h

Index: runtime/bin/isolate_data.h
diff --git a/runtime/bin/isolate_data.h b/runtime/bin/isolate_data.h
new file mode 100644
index 0000000000000000000000000000000000000000..06ac164d77fa0d93c5897f619caa153e65150a83
--- /dev/null
+++ b/runtime/bin/isolate_data.h
@@ -0,0 +1,26 @@
+// 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_