mirror of https://github.com/nealey/irc-bot
134 lines
3.5 KiB
OCaml
134 lines
3.5 KiB
OCaml
type event = Input | Output | Exception
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type timer_handler = float -> unit
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type fd_handler = Unix.file_descr -> event -> unit
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module Timer =
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Set.Make (struct
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type t = (float * timer_handler)
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let compare (time, handler) (time', handler') = compare time time'
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end)
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module Fd_map =
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Map.Make (struct
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type t = Unix.file_descr
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let compare = compare
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end)
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type t = {
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read_fds : Unix.file_descr list ref;
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write_fds : Unix.file_descr list ref;
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except_fds : Unix.file_descr list ref;
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handlers : fd_handler Fd_map.t ref;
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timers : Timer.t ref;
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}
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let create ?(size=5) () =
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{read_fds = ref [];
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write_fds = ref [];
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except_fds = ref [];
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handlers = ref Fd_map.empty;
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timers = ref Timer.empty}
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let destroy d =
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(* Explicitly unreference fds and timers, in case d sticks around *)
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d.handlers := Fd_map.empty;
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d.timers := Timer.empty
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let get_fds d event =
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match event with
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| Input -> d.read_fds
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| Output -> d.write_fds
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| Exception -> d.except_fds
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let modify d fd events =
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let add_event event =
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let l = get_fds d event in
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let nl = (List.filter ((<>) fd) !l) in
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if List.mem event events then
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l := fd :: nl
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else
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l := nl
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in
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if Fd_map.mem fd !(d.handlers) then
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List.iter add_event [Input; Output; Exception]
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else
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raise Not_found
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let set_handler d fd handler =
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d.handlers := Fd_map.add fd handler !(d.handlers)
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let add d fd handler events =
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set_handler d fd handler;
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modify d fd events
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let delete d fd =
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let del_event event =
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let l = get_fds d event in
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l := (List.filter ((<>) fd) !l)
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in
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d.handlers := Fd_map.remove fd !(d.handlers);
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List.iter del_event [Input; Output; Exception]
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let add_timer d handler time =
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d.timers := Timer.add (time, handler) !(d.timers)
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let delete_timer d time =
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let may_remain (time', _) =
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time' <> time
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in
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d.timers := Timer.filter may_remain !(d.timers)
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let rec dispatch_timers d now =
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if not (Timer.is_empty !(d.timers)) then
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let (time, handler) = Timer.min_elt !(d.timers) in
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if now < time then
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()
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else begin
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handler time;
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d.timers := Timer.remove (time, handler) !(d.timers);
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dispatch_timers d now
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end
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let rec dispatch_results d (read_ready, write_ready, except_ready) =
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let rec dispatch event fd_list =
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match fd_list with
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| [] ->
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()
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| fd :: tl ->
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let handler = Fd_map.find fd !(d.handlers) in
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handler fd event;
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dispatch event tl
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in
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dispatch Input read_ready;
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dispatch Output write_ready;
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dispatch Exception except_ready
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let once d =
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(* You might think it'd work better to use the timeout of select().
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Not so! select() waits *at most* timeout ms. Doing things
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this way results in a tight loop as the timer approaches. *)
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let interval =
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try
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let (next, _) = Timer.min_elt !(d.timers) in
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let delta = (next -. (Unix.gettimeofday ())) in
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max delta 0.0
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with Not_found ->
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0.0
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in
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let s = { Unix.it_interval = interval; Unix.it_value = 0.0 } in
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let _ = Sys.set_signal Sys.sigalrm Sys.Signal_ignore in
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let _ = Unix.setitimer Unix.ITIMER_REAL s in
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let result = Unix.select !(d.read_fds) !(d.write_fds) !(d.except_fds) (-1.0) in
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dispatch_results d result;
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dispatch_timers d (Unix.gettimeofday ())
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let rec run d =
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if (Fd_map.is_empty !(d.handlers)) && (Timer.is_empty !(d.timers)) then
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()
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else begin
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once d;
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run d
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end
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