Fix memory leak: dispatcher async handle

Author: milindl

src/callbacks.cc

@@ -74,10 +74,16 @@ void Dispatcher::Activate() {
   }
 }
 
+void Dispatcher::AsyncHandleCloseCallback(uv_handle_t *handle) {
+  uv_async_t *a = reinterpret_cast<uv_async_t *>(handle);
+  delete a;
+}
+
 // Should be able to run this regardless of whether it is active or not
 void Dispatcher::Deactivate() {
   if (async) {
-    uv_close(reinterpret_cast<uv_handle_t*>(async), NULL);
+    uv_close(reinterpret_cast<uv_handle_t *>(async),
+             Dispatcher::AsyncHandleCloseCallback);
     async = NULL;
   }
 }

src/callbacks.h

@@ -53,6 +53,7 @@ class Dispatcher {
             static_cast<Dispatcher*>(async->data);
      dispatcher->Flush();
   }
+  static void AsyncHandleCloseCallback(uv_handle_t *);
 
   uv_async_t *async;
 };