src/Pure/Concurrent/task_queue.ML
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(*  Title:      Pure/Concurrent/task_queue.ML
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    Author:     Makarius
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Ordered queue of grouped tasks.
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*)
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signature TASK_QUEUE =
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sig
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  type task
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  val new_task: int -> task
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  val pri_of_task: task -> int
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  val str_of_task: task -> string
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  type group
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  val new_group: group option -> group
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  val group_id: group -> int
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  val eq_group: group * group -> bool
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  val cancel_group: group -> exn -> unit
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  val is_canceled: group -> bool
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  val group_status: group -> exn list
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  val str_of_group: group -> string
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  type queue
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  val empty: queue
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  val is_empty: queue -> bool
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  val status: queue -> {ready: int, pending: int, running: int}
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  val cancel: queue -> group -> bool
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  val cancel_all: queue -> group list
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  val enqueue: group -> task list -> int -> (bool -> bool) -> queue -> (task * bool) * queue
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  val extend: task -> (bool -> bool) -> queue -> queue option
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  val dequeue: Thread.thread -> queue -> (task * group * (bool -> bool) list) option * queue
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  val dequeue_towards: Thread.thread -> task list -> queue ->
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    (((task * group * (bool -> bool) list) option * task list) * queue)
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  val finish: task -> queue -> bool * queue
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end;
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structure Task_Queue:> TASK_QUEUE =
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struct
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(* tasks *)
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datatype task = Task of int * serial;
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fun new_task pri = Task (pri, serial ());
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fun pri_of_task (Task (pri, _)) = pri;
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fun str_of_task (Task (_, i)) = string_of_int i;
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fun task_ord (Task t1, Task t2) = prod_ord (rev_order o int_ord) int_ord (t1, t2);
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structure Task_Graph = Graph(type key = task val ord = task_ord);
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(* nested groups *)
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datatype group = Group of
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 {parent: group option,
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  id: serial,
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  status: exn list Synchronized.var};
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fun make_group (parent, id, status) = Group {parent = parent, id = id, status = status};
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fun new_group parent = make_group (parent, serial (), Synchronized.var "group" []);
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fun group_id (Group {id, ...}) = id;
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fun eq_group (group1, group2) = group_id group1 = group_id group2;
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fun group_ancestry (Group {parent, id, ...}) =
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  id :: (case parent of NONE => [] | SOME group => group_ancestry group);
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(* group status *)
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fun cancel_group (Group {status, ...}) exn =
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  Synchronized.change status
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    (fn exns =>
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      (case exn of
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        Exn.Interrupt => if null exns then [exn] else exns
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      | _ => exn :: exns));
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fun is_canceled (Group {parent, status, ...}) =
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  not (null (Synchronized.value status)) orelse
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    (case parent of NONE => false | SOME group => is_canceled group);
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fun group_status (Group {parent, status, ...}) =
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  Synchronized.value status @
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    (case parent of NONE => [] | SOME group => group_status group);
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fun str_of_group group =
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  (is_canceled group ? enclose "(" ")") (string_of_int (group_id group));
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(* jobs *)
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datatype job =
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  Job of (bool -> bool) list |
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  Running of Thread.thread;
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type jobs = (group * job) Task_Graph.T;
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fun get_group (jobs: jobs) task = #1 (Task_Graph.get_node jobs task);
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fun get_job (jobs: jobs) task = #2 (Task_Graph.get_node jobs task);
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fun set_job task job (jobs: jobs) = Task_Graph.map_node task (fn (group, _) => (group, job)) jobs;
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fun add_job task dep (jobs: jobs) =
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  Task_Graph.add_edge (dep, task) jobs handle Task_Graph.UNDEF _ => jobs;
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fun get_deps (jobs: jobs) task =
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  Task_Graph.imm_preds jobs task handle Task_Graph.UNDEF _ => [];
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(* queue of grouped jobs *)
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datatype result = Unknown | Result of task | No_Result;
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datatype queue = Queue of
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 {groups: task list Inttab.table,   (*groups with presently active members*)
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  jobs: jobs,                       (*job dependency graph*)
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  cache: result};                   (*last dequeue result*)
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fun make_queue groups jobs cache = Queue {groups = groups, jobs = jobs, cache = cache};
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val empty = make_queue Inttab.empty Task_Graph.empty No_Result;
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fun is_empty (Queue {jobs, ...}) = Task_Graph.is_empty jobs;
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(* queue status *)
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fun status (Queue {jobs, ...}) =
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  let
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    val (x, y, z) =
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      Task_Graph.fold (fn (task, ((_, job), (deps, _))) => fn (x, y, z) =>
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          (case job of
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            Job _ => if null deps then (x + 1, y, z) else (x, y + 1, z)
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          | Running _ => (x, y, z + 1)))
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        jobs (0, 0, 0);
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  in {ready = x, pending = y, running = z} end;
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(* cancel -- peers and sub-groups *)
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fun cancel (Queue {groups, jobs, ...}) group =
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  let
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    val _ = cancel_group group Exn.Interrupt;
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    val tasks = Inttab.lookup_list groups (group_id group);
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    val running =
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      fold (get_job jobs #> (fn Running t => insert Thread.equal t | _ => I)) tasks [];
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    val _ = List.app SimpleThread.interrupt running;
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  in null running end;
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fun cancel_all (Queue {jobs, ...}) =
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  let
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    fun cancel_job (group, job) (groups, running) =
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      (cancel_group group Exn.Interrupt;
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        (case job of Running t => (insert eq_group group groups, insert Thread.equal t running)
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        | _ => (groups, running)));
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    val (groups, running) = Task_Graph.fold (cancel_job o #1 o #2) jobs ([], []);
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    val _ = List.app SimpleThread.interrupt running;
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  in groups end;
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(* enqueue *)
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fun enqueue group deps pri job (Queue {groups, jobs, cache}) =
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  let
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    val task = new_task pri;
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    val groups' = groups
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      |> fold (fn gid => Inttab.cons_list (gid, task)) (group_ancestry group);
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    val jobs' = jobs
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      |> Task_Graph.new_node (task, (group, Job [job]))
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      |> fold (add_job task) deps
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      |> fold (fold (add_job task) o get_deps jobs) deps;
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    val minimal = null (get_deps jobs' task);
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    val cache' =
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      (case cache of
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        Result last =>
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          if task_ord (last, task) = LESS
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          then cache else Unknown
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      | _ => Unknown);
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  in ((task, minimal), make_queue groups' jobs' cache') end;
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fun extend task job (Queue {groups, jobs, cache}) =
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  (case try (get_job jobs) task of
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    SOME (Job list) => SOME (make_queue groups (set_job task (Job (job :: list)) jobs) cache)
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  | _ => NONE);
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(* dequeue *)
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fun dequeue thread (queue as Queue {groups, jobs, cache}) =
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  let
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    fun ready (task, ((group, Job list), ([], _))) = SOME (task, group, rev list)
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      | ready _ = NONE;
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    fun deq boundary =
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      (case Task_Graph.get_first boundary ready jobs of
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        NONE => (NONE, make_queue groups jobs No_Result)
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      | SOME (result as (task, _, _)) =>
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          let
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            val jobs' = set_job task (Running thread) jobs;
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            val cache' = Result task;
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          in (SOME result, make_queue groups jobs' cache') end);
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  in
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    (case cache of
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      Unknown => deq NONE
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    | Result last => deq (SOME last)
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    | No_Result => (NONE, queue))
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  end;
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(* dequeue_towards -- adhoc dependencies *)
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fun dequeue_towards thread deps (queue as Queue {groups, jobs, ...}) =
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  let
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    fun ready task =
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      (case Task_Graph.get_node jobs task of
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        (group, Job list) =>
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          if null (get_deps jobs task)
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          then SOME (task, group, rev list)
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          else NONE
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      | _ => NONE);
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    val tasks = filter (can (Task_Graph.get_node jobs)) deps;
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    fun result (res as (task, _, _)) =
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      let
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        val jobs' = set_job task (Running thread) jobs;
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        val cache' = Unknown;
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      in ((SOME res, tasks), make_queue groups jobs' cache') end;
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  in
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    (case get_first ready tasks of
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      SOME res => result res
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    | NONE =>
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        (case get_first (get_first ready o get_deps jobs) tasks of
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          SOME res => result res
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        | NONE => ((NONE, tasks), queue)))
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  end;
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(* finish *)
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fun finish task (Queue {groups, jobs, cache}) =
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  let
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    val group = get_group jobs task;
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    val groups' = groups
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      |> fold (fn gid => Inttab.remove_list (op =) (gid, task)) (group_ancestry group);
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    val jobs' = Task_Graph.del_node task jobs;
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    val maximal = null (Task_Graph.imm_succs jobs task);
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    val cache' = if maximal then cache else Unknown;
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  in (maximal, make_queue groups' jobs' cache') end;
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end;