type waiter =
{ w_wait : unit Lwt.t;
w_waker: unit Lwt.u option;
mutable w_did_wait : bool }
I don't understand why there are "unit" in w_wait and w_waker?
What does 'unit' mean in such a type definition?
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According to Lwt's doc the type
'a Lwt.tis the "type of threads returning a result of type 'a.", so yourw_waitis a cooperative thread returning unit (i.e. having only side effects). Likewise'a Lwt.uis the "type of thread wakeners".I don't understand what you don't understand in Lwt documentation. It seems quite understandable to me.