class type['t]
engine =object
..end
't
is the type of the result values (when the
engine goes to state `Done
).method state : 't engine_state
method abort : unit -> unit
`Done
, `Aborted
, or `Error
, this method must do nothing (you
cannot abort an already finished engine).method request_notification : (unit -> bool) -> unit
After the notification has been requested, the passed function must
be called whenever state
changes its value (or might change
its value; it is allowed to call the notification function more
frequently than necessary). The function returns true
if there
is still interest in notification, and false
if notification must
be disabled; the function must not be called any longer in this
case.
There can be any number of parallel active notifications. It is allowed that a notification callback function requests further notifications.
If the callback raises an exception, this exception is
propagated to the caller of Unixqueue.run
.
method event_system : Unixqueue.event_system