You can use the following attributes to provide support for asynchronous remote procedure calls:
| Attribute | Usage |
|---|---|
| async | When applied to a function parameter, defines a handle that allows the caller to make an asynchronous call and return immediately without waiting for results, and later resynchronize with the callee to receive data after the call completes. The async attribute is also used in ACF files to define an asynchronous handle for a procedure or an entire interface. |
| maybe | The client making this remote procedure call does not expect any response indicating delivery or completion of the call, and delivery is not guaranteed. This is in contrast to message operations where no response is expected but the delivery is guaranteed. |
| message | The remote procedure call is to be treated as an asynchronous message from the client to the server. The client makes the call and returns immediately, while the actual call is handled by the message-queuing transport (ncadg_mq). |