src/Pure/PIDE/execution.ML
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(*  Title:      Pure/PIDE/execution.ML
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    Author:     Makarius
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Global management of execution.  Unique running execution serves as
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barrier for further exploration of forked command execs.
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*)
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signature EXECUTION =
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sig
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  val start: unit -> Document_ID.execution
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  val discontinue: unit -> unit
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  val is_running: Document_ID.execution -> bool
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  val is_running_exec: Document_ID.exec -> bool
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  val running: Document_ID.execution -> Document_ID.exec -> Future.group list -> bool
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  val peek: Document_ID.exec -> Future.group list
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  val cancel: Document_ID.exec -> unit
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  val terminate: Document_ID.exec -> unit
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  val fork: {name: string, pos: Position.T, pri: int} -> (unit -> 'a) -> 'a future
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  val print: (serial -> unit) -> unit
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  val apply_prints: Document_ID.exec -> unit
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  val purge: Document_ID.exec list -> unit
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  val reset: unit -> Future.group list
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  val shutdown: unit -> unit
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end;
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structure Execution: EXECUTION =
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struct
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(* global state *)
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type exec_state = Future.group list * (unit -> unit) list;  (*active forks, prints*)
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type state =
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  Document_ID.execution * (*overall document execution*)
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  exec_state Inttab.table;  (*running command execs*)
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val init_state: state = (Document_ID.none, Inttab.make [(Document_ID.none, ([], []))]);
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val state = Synchronized.var "Execution.state" init_state;
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fun get_state () = Synchronized.value state;
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fun change_state_result f = Synchronized.change_result state f;
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fun change_state f = Synchronized.change state f;
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fun unregistered exec_id = "Unregistered execution: " ^ Document_ID.print exec_id;
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(* unique running execution *)
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fun start () =
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  let
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    val execution_id = Document_ID.make ();
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    val _ = change_state (apfst (K execution_id));
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  in execution_id end;
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fun discontinue () = change_state (apfst (K Document_ID.none));
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fun is_running execution_id = execution_id = #1 (get_state ());
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(* execs *)
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fun is_running_exec exec_id =
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  Inttab.defined (#2 (get_state ())) exec_id;
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fun running execution_id exec_id groups =
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  change_state_result (fn (execution_id', execs) =>
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    let
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      val continue = execution_id = execution_id';
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      val execs' =
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        if continue then
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          Inttab.update_new (exec_id, (groups, [])) execs
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            handle Inttab.DUP dup =>
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              raise Fail ("Execution already registered: " ^ Document_ID.print dup)
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        else execs;
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    in (continue, (execution_id', execs')) end);
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fun peek exec_id =
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  (case Inttab.lookup (#2 (get_state ())) exec_id of
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    SOME (groups, _) => groups
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  | NONE => []);
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fun cancel exec_id = List.app Future.cancel_group (peek exec_id);
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fun terminate exec_id = List.app Future.terminate (peek exec_id);
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(* fork *)
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fun status task markups =
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  let val props = Markup.properties [(Markup.taskN, Task_Queue.str_of_task task)]
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  in Output.status (implode (map (Markup.markup_only o props) markups)) end;
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fun fork {name, pos, pri} e =
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  uninterruptible (fn _ => Position.setmp_thread_data pos (fn () =>
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    let
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      val exec_id = the_default 0 (Position.parse_id pos);
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      val group = Future.worker_subgroup ();
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      val _ = change_state (apsnd (fn execs =>
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        (case Inttab.lookup execs exec_id of
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          SOME (groups, prints) =>
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            Inttab.update (exec_id, (group :: groups, prints)) execs
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        | NONE => raise Fail (unregistered exec_id))));
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      val future =
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        (singleton o Future.forks)
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          {name = name, group = SOME group, deps = [], pri = pri, interrupts = false}
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          (fn () =>
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            let
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              val task = the (Future.worker_task ());
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              val _ = status task [Markup.running];
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              val result =
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                Exn.capture (Future.interruptible_task e) ()
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                |> Future.identify_result pos;
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              val _ = status task [Markup.joined];
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              val _ =
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                (case result of
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                  Exn.Exn exn =>
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                   (status task [Markup.failed];
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                    status task [Markup.finished];
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                    Output.report (Markup.markup_only Markup.bad);
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                    if exec_id = 0 then ()
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                    else List.app (Future.error_msg pos) (ML_Compiler.exn_messages_ids exn))
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                | Exn.Res _ =>
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                    status task [Markup.finished])
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            in Exn.release result end);
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      val _ = status (Future.task_of future) [Markup.forked];
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    in future end)) ();
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(* print *)
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fun print pr =
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  change_state (apsnd (fn execs =>
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    let
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      val exec_id = the_default 0 (Position.parse_id (Position.thread_data ()));
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      val i = serial ();
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    in
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      (case Inttab.lookup execs exec_id of
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        SOME (groups, prints) =>
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          Inttab.update (exec_id, (groups, (fn () => pr i) :: prints)) execs
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      | NONE => raise Fail (unregistered exec_id))
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    end));
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fun apply_prints exec_id =
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  (case Inttab.lookup (#2 (get_state ())) exec_id of
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    SOME (_, prints) =>
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      if null prints orelse null (tl prints) orelse not (Multithreading.enabled ())
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      then List.app (fn e => e ()) (rev prints)
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      else
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        let
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          val pos = Position.thread_data ();
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          val pri =
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            (case Future.worker_task () of
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              SOME task => Task_Queue.pri_of_task task
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            | NONE => 0);
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          val futures = map (fork {name = "Execution.print", pos = pos, pri = pri}) (rev prints);
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        in ignore (Future.joins futures) end
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  | NONE => raise Fail (unregistered exec_id));
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(* cleanup *)
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fun purge exec_ids =
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  (change_state o apsnd) (fn execs =>
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    let
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      val execs' = fold Inttab.delete_safe exec_ids execs;
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      val () =
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        (execs', ()) |-> Inttab.fold (fn (exec_id, (groups, _)) => fn () =>
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          if Inttab.defined execs' exec_id then ()
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          else groups |> List.app (fn group =>
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            if Task_Queue.is_canceled group then ()
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            else raise Fail ("Attempt to purge valid execution: " ^ Document_ID.print exec_id)));
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    in execs' end);
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fun reset () =
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  change_state_result (fn (_, execs) =>
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    let val groups = Inttab.fold (append o #1 o #2) execs []
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    in (groups, init_state) end);
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fun shutdown () =
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  (Future.shutdown ();
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    (case maps Task_Queue.group_status (reset ()) of
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      [] => ()
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    | exns => raise Par_Exn.make exns));
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end;
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