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ev-kqueue-mlton.sml
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ev-kqueue-mlton.sml
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(* Copyright (C) 2016 Nick Kostyria. BSD3 license. *)
signature OS_IO_EV = sig
type evFd = int
datatype evFilter = evRead | evWrite
type evCb = (evFd * evFilter) -> unit
datatype evDesc = evAdd of evFd * evFilter * evCb | evDelete of evFd * evFilter
type ev
exception Ev of string
val evInit: unit -> ev
val evModify: ev -> evDesc list -> int
val evWait: ev -> Time.time option -> int
end
structure Ev :> OS_IO_EV =
struct
structure H = HashArrayInt
type evFd = int
datatype evFilter = evRead | evWrite
type evCb = (evFd * evFilter) -> unit
datatype evDesc = evAdd of evFd * evFilter * evCb | evDelete of evFd * evFilter
type ev = {ev: int, rH: evCb H.hash, wH: evCb H.hash}
exception Ev of string
val () = MLton.Exn.addExnMessager (fn Ev m => SOME ("Ev \"" ^ m ^ "\"") | _ => NONE)
local
open MLton.Pointer
open MLton.Platform
val max_events = 64
val hash_size = 1000
val (kevent_size, timeout_size) =
case Arch.host of
Arch.X86 => (56, 8)
| Arch.AMD64 => (64, 16)
| Arch.ARM => (64, 16)
| Arch.ARM64 => (64, 16)
| _ => raise Ev "Unsupported platform"
val malloc = (_import "malloc" : Word.word -> t;) o Word.fromInt
val kevent_list_pointer = malloc (kevent_size * max_events)
val timeout_pointer = malloc timeout_size
val kqueue = _import "kqueue" : unit -> int;
val kevent = _import "kevent" : int * t * int * t * int * t -> int;
fun kevent_change kq changelist =
let
fun pack_kevent_struct_list p l =
let
fun pack_kevent_struct ((ident, filter, flags, fflags, data, udata), p) = (
case Arch.host of
Arch.X86 => (
setWord32 (add (p, 0w0), 0, Word32.fromInt ident);
setInt16 (add (p, 0w4), 0, Int16.fromInt filter);
setWord16 (add (p, 0w6), 0, Word16.fromInt flags);
setWord32 (add (p, 0w8), 0, Word32.fromInt fflags);
setInt64 (add (p, 0w12), 0, Int64.fromInt data);
setPointer (add (p, 0w20), 0, null);
setInt64 (add (p, 0w24), 0, 0);
setInt64 (add (p, 0w32), 0, 0);
setInt64 (add (p, 0w40), 0, 0);
setInt64 (add (p, 0w48), 0, 0)
)
| Arch.AMD64 => (
setWord64 (add (p, 0w0), 0, Word64.fromInt ident);
setInt16 (add (p, 0w8), 0, Int16.fromInt filter);
setWord16 (add (p, 0w10), 0, Word16.fromInt flags);
setWord32 (add (p, 0w12), 0, Word32.fromInt fflags);
setInt64 (add (p, 0w16), 0, Int64.fromInt data);
setPointer (add (p, 0w24), 0, null);
setInt64 (add (p, 0w32), 0, 0);
setInt64 (add (p, 0w40), 0, 0);
setInt64 (add (p, 0w48), 0, 0);
setInt64 (add (p, 0w56), 0, 0)
)
| Arch.ARM => (
setWord32 (add (p, 0w0), 0, Word32.fromInt ident);
setInt16 (add (p, 0w4), 0, Int16.fromInt filter);
setWord16 (add (p, 0w6), 0, Word16.fromInt flags);
setWord32 (add (p, 0w8), 0, Word32.fromInt fflags);
setInt64 (add (p, 0w16), 0, Int64.fromInt data);
setPointer (add (p, 0w24), 0, null);
setInt64 (add (p, 0w32), 0, 0);
setInt64 (add (p, 0w40), 0, 0);
setInt64 (add (p, 0w48), 0, 0);
setInt64 (add (p, 0w56), 0, 0)
)
| Arch.ARM64 => (
setWord64 (add (p, 0w0), 0, Word64.fromInt ident);
setInt16 (add (p, 0w8), 0, Int16.fromInt filter);
setWord16 (add (p, 0w10), 0, Word16.fromInt flags);
setWord32 (add (p, 0w12), 0, Word32.fromInt fflags);
setInt64 (add (p, 0w16), 0, Int64.fromInt data);
setPointer (add (p, 0w24), 0, null);
setInt64 (add (p, 0w32), 0, 0);
setInt64 (add (p, 0w40), 0, 0);
setInt64 (add (p, 0w48), 0, 0);
setInt64 (add (p, 0w56), 0, 0)
)
| _ => raise Ev "Unsupported platform"
;
add (p, Word.fromInt kevent_size)
)
in
Vector.foldl pack_kevent_struct p l
end
in
pack_kevent_struct_list kevent_list_pointer changelist;
kevent (kq, kevent_list_pointer, Vector.length changelist, MLton.Pointer.null, 0, MLton.Pointer.null)
end
fun kevent_wait kq eventlist t =
let
fun pack_timeout t =
case t of
NONE => MLton.Pointer.null
| SOME (s, n) => (
case Arch.host of
Arch.X86 => (
setInt32 (add (timeout_pointer, 0w0), 0, Int32.fromInt s);
setInt32 (add (timeout_pointer, 0w4), 0, Int32.fromInt n)
)
| Arch.AMD64 => (
setInt64 (add (timeout_pointer, 0w0), 0, Int64.fromInt s);
setInt64 (add (timeout_pointer, 0w8), 0, Int64.fromInt n)
)
| Arch.ARM => (
setInt64 (add (timeout_pointer, 0w0), 0, Int64.fromInt s);
setInt32 (add (timeout_pointer, 0w8), 0, Int32.fromInt n)
)
| Arch.ARM64 => (
setInt64 (add (timeout_pointer, 0w0), 0, Int64.fromInt s);
setInt64 (add (timeout_pointer, 0w8), 0, Int64.fromInt n)
)
| _ => raise Ev "Unsupported platform"
;
timeout_pointer
)
val cnt = kevent (kq, MLton.Pointer.null, 0, kevent_list_pointer, max_events, (pack_timeout t))
fun unpack_kevent_struct_list p n =
let
fun unpack_kevent_struct p =
let
val (ident, filter, flags, fflags, data) =
case Arch.host of
Arch.X86 => (
let
val ident = Word32.toInt (getWord32 (add (p, 0w0), 0))
val filter = Int16.toInt (getInt16 (add (p, 0w4), 0))
val flags = Int16.toInt (getInt16 (add (p, 0w6), 0))
val fflags = Word32.toInt (getWord32 (add (p, 0w8), 0))
val data = Int64.toInt (getInt64 (add (p, 0w12), 0))
in (ident, filter, flags, fflags, data) end
)
| Arch.AMD64 => (
let
val ident = Word64.toInt (getWord64 (add (p, 0w0), 0))
val filter = Int16.toInt (getInt16 (add (p, 0w8), 0))
val flags = Int16.toInt (getInt16 (add (p, 0w10), 0))
val fflags = Word32.toInt (getWord32 (add (p, 0w12), 0))
val data = Int64.toInt (getInt64 (add (p, 0w16), 0))
in (ident, filter, flags, fflags, data) end
)
| Arch.ARM => (
let
val ident = Word32.toInt (getWord32 (add (p, 0w0), 0))
val filter = Int16.toInt (getInt16 (add (p, 0w4), 0))
val flags = Int16.toInt (getInt16 (add (p, 0w6), 0))
val fflags = Word32.toInt (getWord32 (add (p, 0w8), 0))
val data = Int64.toInt (getInt64 (add (p, 0w16), 0))
in (ident, filter, flags, fflags, data) end
)
| Arch.ARM64 => (
let
val ident = Word64.toInt (getWord64 (add (p, 0w0), 0))
val filter = Int16.toInt (getInt16 (add (p, 0w8), 0))
val flags = Int16.toInt (getInt16 (add (p, 0w10), 0))
val fflags = Word32.toInt (getWord32 (add (p, 0w12), 0))
val data = Int64.toInt (getInt64 (add (p, 0w16), 0))
in (ident, filter, flags, fflags, data) end
)
| _ => raise Ev "Unsupported platform"
in
((ident, filter, flags, fflags, data, {}), add (p, Word.fromInt kevent_size))
end
fun doit p i n =
if i = n
then n
else
let
val (v,p) = unpack_kevent_struct p
in
Array.update (eventlist, i, v);
doit p (i+1) n
end
in
doit p 0 n
end
in
if cnt > 0
then unpack_kevent_struct_list kevent_list_pointer cnt
else cnt
end
val kevent_struct_empty = (0,0,0,0,0,{})
val eventlist = Array.array (max_events, kevent_struct_empty)
in
fun evInit () =
let
val ev = kqueue ()
in
if ev = ~1 then raise Ev "evInit" else
{ ev = ev, rH = H.hash hash_size, wH = H.hash hash_size }
end
fun evModify (ev:ev) ev_desc_list =
let
fun evFilterToInt evRead = ~1
| evFilterToInt evWrite = ~2
fun evFilterToH evRead = #rH ev
| evFilterToH evWrite = #wH ev
fun toChange fd filter action = (fd, (evFilterToInt filter), action, 0, 0, {})
fun evDescToChange (evAdd (fd, filter, cb)) = toChange fd filter 1
| evDescToChange (evDelete (fd, filter)) = toChange fd filter 2
fun evDescFilter (evAdd (fd, filter, cb)) = (H.update ((evFilterToH filter), fd, cb); true)
| evDescFilter (evDelete (fd, filter)) =
let
val H = evFilterToH filter
in
if isSome (H.sub (H, fd))
then ( H.delete (H, fd) ; true )
else false
end
val changelist = Vector.fromList ( map evDescToChange ( List.filter evDescFilter ev_desc_list ) )
val _ = if Vector.length changelist > max_events then raise Ev "too big changelist" else ()
val cnt = kevent_change (#ev ev) changelist
in
if cnt >= 0
then cnt
else raise Ev "evModify"
end
fun evWait (ev:ev) t =
let
val timeout = case t of
SOME t =>
let
val s = Time.toSeconds t
val n = Time.toNanoseconds t - s * 1000000000
in
SOME (Int.fromLarge s, Int.fromLarge n)
end
| NONE => NONE
val cnt = kevent_wait (#ev ev) eventlist timeout
fun intToevFilter (~1) = evRead
| intToevFilter (~2) = evWrite
| intToevFilter _ = raise Ev "intToevFilter"
fun getCb fd evRead = H.sub ((#rH ev), fd)
| getCb fd evWrite = H.sub ((#wH ev), fd)
fun new_loop 0 = cnt
| new_loop i =
let
val (fd,f,_,_,_,_) = Array.sub (eventlist, (i-1))
val filter = intToevFilter f
in
case getCb fd filter of
SOME cb => cb (fd, filter)
| NONE => ()
;
new_loop (i - 1)
end
in
if cnt >= 0
then new_loop cnt
else cnt
end
end
end