getdns_context_destroy in the callback

gistfile1.c

/* Set up the callback function, which will also do the processing of the results */
void this_callbackfn(getdns_context *this_context,
                     getdns_callback_type_t this_callback_type,
                     getdns_dict *this_response, 
                     void *this_userarg,
                     getdns_transaction_t this_transaction_id)
{
  // The first callback to receive this triggers the other callbacks
  // to be called as if they were canceled.  They end up calling
  // destroy again on the same context already being destroyed
  // before returning and printing "Context destroyed".
  // This can also be triggered if a request was canceled or timed
  // out and other requests are pending.
  getdns_context_destroy(this_context);
  printf("Context destroyed\n");
}

int main()
{
	/* Create the DNS context for this call */
	getdns_context *this_context = NULL;
	getdns_return_t context_create_return = getdns_context_create(&this_context, 1);
	/* Create an event base and put it in the context using the unknown function name */
	struct event_base *this_event_base = event_base_new();
	getdns_extension_set_libevent_base(this_context, this_event_base);
	
	// Fire off a bunch of requests
	for (int i = 0; i < 10; ++i) {
  	getdns_address(this_context, this_name,
  		NULL, NULL, NULL, this_callbackfn);
  }
	
	/* Call the event loop */
	event_base_dispatch(this_event_base);
		
	event_base_free(this_event_base);
	/* Assuming we get here, leave gracefully */
	exit(EXIT_SUCCESS);
}