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|
(* thread.sml
* 2004 Matthew Fluet (mfluet@acm.org)
* Ported to MLton threads.
*)
(* thread.sml
*
* COPYRIGHT (c) 1995 AT&T Bell Laboratories.
* COPYRIGHT (c) 1989-1991 John H. Reppy
*)
structure Thread : THREAD =
struct
structure Assert = LocalAssert(val assert = false)
structure Debug = LocalDebug(val debug = false)
structure S = Scheduler
fun debug msg = Debug.sayDebug ([S.atomicMsg, S.tidMsg], msg)
fun debug' msg = debug (fn () => msg)
open ThreadID
fun generalExit (tid', clr') =
let
val () = Assert.assertNonAtomic' "Thread.generalExit"
val () = debug' "generalExit" (* NonAtomic *)
val () = Assert.assertNonAtomic' "Thread.generalExit"
in
S.switchToNext
(fn t =>
let
val tid as TID {dead, props, ...} = S.getThreadId t
val () = Assert.assert ([], fn () =>
concat ["Thread.generalExit ",
Option.getOpt (Option.map tidToString tid', "NONE"),
" <> ",
tidToString tid], fn () =>
case tid' of NONE => true
| SOME tid' => sameTid (tid', tid))
val () = if clr' then props := [] else ()
val () = Event.atomicCVarSet dead
in
()
end)
end
fun doHandler (TID {exnHandler, ...}, exn) =
(debug (fn () => concat ["Exception: ", exnName exn, " : ", exnMessage exn])
; ((!exnHandler) exn) handle _ => ())
fun spawnc f x =
let
val () = S.atomicBegin ()
fun thread tid () =
((f x) handle ex => doHandler (tid, ex)
; generalExit (SOME tid, false))
val t = S.new thread
val tid = S.getThreadId t
val () = S.ready (S.prep t)
val () = S.atomicEnd ()
val () = debug (fn () => concat ["spawnc ", tidToString tid]) (* NonAtomic *)
in
tid
end
fun spawn f = spawnc f ()
fun joinEvt (TID{dead, ...}) = Event.cvarGetEvt dead
val getTid = S.getCurThreadId
fun exit () =
let
val () = Assert.assertNonAtomic' "Thread.exit"
val () = debug' "exit" (* NonAtomic *)
val () = Assert.assertNonAtomic' "Thread.exit"
in
generalExit (NONE, true)
end
fun yield () =
let
val () = Assert.assertNonAtomic' "Thread.yield"
val () = debug' "yield" (* NonAtomic *)
val () = Assert.assertNonAtomic' "Thread.yield"
in
S.readyAndSwitchToNext (fn () => ())
end
(* thread-local data *)
local
fun mkProp () =
let
exception E of 'a
fun cons (a, l) = E a :: l
fun peek [] = NONE
| peek (E a :: _) = SOME a
| peek (_ :: l) = peek l
fun delete [] = []
| delete (E _ :: r) = r
| delete (x :: r) = x :: delete r
in
{cons = cons,
peek = peek,
delete = delete}
end
fun mkFlag () =
let
exception E
fun peek [] = false
| peek (E :: _) = true
| peek (_ :: l) = peek l
fun set (l, flg) =
let
fun set ([], _) = if flg then E::l else l
| set (E::r, xs) = if flg then l else List.revAppend(xs, r)
| set (x::r, xs) = set (r, x::xs)
in
set (l, [])
end
in
{set = set,
peek = peek}
end
fun getProps () =
let val TID {props, ...} = getTid ()
in props
end
in
fun newThreadProp (init : unit -> 'b) =
let
val {peek, cons, delete} = mkProp()
fun peekFn () = peek(!(getProps()))
fun getF () =
let val h = getProps()
in
case peek(!h) of
NONE => let val b = init()
in h := cons(b, !h); b
end
| (SOME b) => b
end
fun clrF () =
let val h = getProps()
in h := delete(!h)
end
fun setFn x =
let val h = getProps()
in h := cons(x, delete(!h))
end
in
{peekFn = peekFn,
getFn = getF,
clrFn = clrF,
setFn = setFn}
end
fun newThreadFlag () =
let
val {peek, set} = mkFlag()
fun getF ()= peek(!(getProps()))
fun setF flg =
let val h = getProps()
in h := set(!h, flg)
end
in
{getFn = getF,
setFn = setF}
end
end
end
|
