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(* From: https://github.com/msullivan/sml-util *)
(* Copyright (c) 2011-2015 Michael J. Sullivan *)
(* *)
(* Permission is hereby granted, free of charge, to any person obtaining a copy *)
(* of this software and associated documentation files (the "Software"), to deal *)
(* in the Software without restriction, including without limitation the rights *)
(* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell *)
(* copies of the Software, and to permit persons to whom the Software is *)
(* furnished to do so, subject to the following conditions: *)
(* *)
(* The above copyright notice and this permission notice shall be included in *)
(* all copies or substantial portions of the Software. *)
(* *)
(* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *)
(* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *)
(* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *)
(* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *)
(* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, *)
(* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN *)
(* THE SOFTWARE. *)
signature TIMEOUT =
sig
exception Timeout
(* Run a function with a timeout. *)
val runWithTimeout : Time.time -> ('a -> 'b) -> 'a -> 'b option
(* Run a function with a timeout, raising Timeout if it triggers *)
val runWithTimeoutExn : Time.time -> ('a -> 'b) -> 'a -> 'b
end
structure Timeout :> TIMEOUT =
struct
exception Timeout
fun finally f final =
f () before ignore (final ())
handle e => (final (); raise e)
fun runWithTimeout t f x =
let val timer = SMLofNJ.IntervalTimer.setIntTimer
fun cleanup () =
(timer NONE;
Signals.setHandler (Signals.sigALRM, Signals.IGNORE); ())
val ret = ref NONE
fun doit k =
let fun handler _ = k
val _ = Signals.setHandler (Signals.sigALRM,
Signals.HANDLER handler)
val () = timer (SOME t)
in ret := SOME (f x) end
val () = finally (fn () => SMLofNJ.Cont.callcc doit) cleanup
in !ret end
fun runWithTimeoutExn t f x =
case runWithTimeout t f x
of SOME x => x
| NONE => raise Timeout
end
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