Every asynchronous mode Client-Library call that returns CS_PENDING produces a completion status. This value corresponds to the return code that would have been returned by a synchronous-mode call to the routine (for example, CS_SUCCEED or CS_FAIL).
An application determines when an asynchronous routine completes either by polling or through completion callbacks. For polling, the application periodically calls ct_poll to determine if the asynchronous call has completed. With completion callbacks, the application is automatically notified when asynchronous calls complete.
To properly exit Client-Library, wait until all asynchronous operations are complete, then call ct_exit.
If an asynchronous operation is in progress when ct_exit is called, the routine returns CS_FAIL and does not exit Client-Library properly, even when CS_FORCE_EXIT is used.
