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module Key = struct
type t = Optint.Int63.t
let compare = Optint.Int63.compare
end
type item =
| Fiber of unit Suspended.t
| Fn of (unit -> unit)
module Job = struct
type t = {
time : Mtime.t;
item : item;
}
let compare a b = Mtime.compare a.time b.time
end
module Q = Psq.Make(Key)(Job)
type t = {
mutable sleep_queue: Q.t;
mutable next_id : Optint.Int63.t;
}
let create () = { sleep_queue = Q.empty; next_id = Optint.Int63.zero }
let add t time item =
let id = t.next_id in
t.next_id <- Optint.Int63.succ t.next_id;
let sleeper = { Job.time; item } in
t.sleep_queue <- Q.add id sleeper t.sleep_queue;
id
let remove t id =
t.sleep_queue <- Q.remove id t.sleep_queue
let pop t ~now =
match Q.min t.sleep_queue with
| Some (_, { Job.time; item }) when time <= now ->
begin
match item with
| Fiber k -> Eio.Private.Fiber_context.clear_cancel_fn k.fiber
| Fn _ -> ()
end;
t.sleep_queue <- Option.get (Q.rest t.sleep_queue);
`Due item
| Some (_, { Job.time; _ }) -> `Wait_until time
| None -> `Nothing