author | wenzelm |
Wed, 10 Sep 2008 23:19:36 +0200 | |
changeset 28196 | f019dd2db561 |
parent 28190 | 0a2434cf38c9 |
child 28202 | 23cb9a974630 |
permissions | -rw-r--r-- |
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(* Title: Pure/Concurrent/task_queue.ML |
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ID: $Id$ |
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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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eqtype task |
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val str_of_task: task -> string |
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eqtype group |
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val new_group: unit -> group |
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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 enqueue: group -> task list -> (bool -> bool) -> queue -> task * queue |
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val depend: task list -> task -> queue -> queue |
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val dequeue: queue -> (task * group * (unit -> bool)) option * queue |
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val dequeue_towards: task list -> queue -> (task * group * (unit -> bool)) option * queue |
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val interrupt: queue -> task -> unit |
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val interrupt_external: queue -> string -> unit |
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val finish: task -> queue -> queue |
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val cancel: queue -> group -> bool |
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end; |
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structure TaskQueue: TASK_QUEUE = |
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struct |
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(* identifiers *) |
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datatype task = Task of serial; |
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fun str_of_task (Task i) = string_of_int i; |
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datatype group = Group of serial * bool ref; |
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fun new_group () = Group (serial (), ref true); |
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fun str_of_group (Group (i, ref ok)) = |
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if ok then string_of_int i else enclose "(" ")" (string_of_int i); |
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(* jobs *) |
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datatype job = |
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Job of bool -> bool | |
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Running of Thread.thread; |
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type jobs = (group * job) IntGraph.T; |
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fun defined_job (jobs: jobs) (Task id) = can (IntGraph.get_node jobs) id; |
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fun get_group (jobs: jobs) (Task id) = #1 (IntGraph.get_node jobs id); |
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fun get_job (jobs: jobs) (Task id) = #2 (IntGraph.get_node jobs id); |
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fun map_job (Task id) f (jobs: jobs) = IntGraph.map_node id (apsnd f) jobs; |
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fun add_job (Task id) (Task dep) (jobs: jobs) = |
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IntGraph.add_edge_acyclic (dep, id) jobs handle IntGraph.UNDEF _ => jobs; |
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(* queue of grouped jobs *) |
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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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fun make_queue groups jobs = Queue {groups = groups, jobs = jobs}; |
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val empty = make_queue Inttab.empty IntGraph.empty; |
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(* enqueue *) |
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fun enqueue (group as Group (gid, _)) deps job (Queue {groups, jobs}) = |
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let |
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val id = serial (); |
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val task = Task id; |
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val groups' = Inttab.cons_list (gid, task) groups; |
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val jobs' = jobs |
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|> IntGraph.new_node (id, (group, Job job)) |> fold (add_job task) deps; |
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in (task, make_queue groups' jobs') end; |
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fun depend deps task (Queue {groups, jobs}) = |
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make_queue groups (fold (add_job task) deps jobs); |
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(* dequeue *) |
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fun dequeue_if P (queue as Queue {groups, jobs}) = |
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let |
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fun ready (id, ((group as Group (_, ref ok), Job job), ([], _))) = |
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if P id then SOME (Task id, group, (fn () => job ok)) else NONE |
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| ready _ = NONE; |
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in |
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(case IntGraph.get_first ready jobs of |
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NONE => (NONE, queue) |
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| SOME result => |
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let val jobs' = map_job (#1 result) (K (Running (Thread.self ()))) jobs |
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in (SOME result, make_queue groups jobs') end) |
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end; |
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val dequeue = dequeue_if (K true); |
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fun dequeue_towards tasks (queue as Queue {jobs, ...}) = |
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let val ids = tasks |
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|> map_filter (fn task as Task id => if defined_job jobs task then SOME id else NONE) |
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in dequeue_if (member (op =) (IntGraph.all_preds jobs ids)) queue end; |
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(* sporadic interrupts *) |
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fun interrupt_thread thread = Thread.interrupt thread handle Thread _ => (); |
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fun interrupt (Queue {jobs, ...}) task = |
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(case try (get_job jobs) task of SOME (Running thread) => interrupt_thread thread | _ => ()); |
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fun interrupt_external queue str = |
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(case Int.fromString str of SOME id => interrupt queue (Task id) | NONE => ()); |
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(* termination *) |
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fun cancel (Queue {groups, jobs}) (Group (gid, ok)) = |
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let |
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val _ = ok := false; (*invalidate any future group members*) |
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val tasks = Inttab.lookup_list groups gid; |
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val running = fold (get_job jobs #> (fn Running thread => cons thread | _ => I)) tasks []; |
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val _ = List.app interrupt_thread running; |
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in null running end; |
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fun finish (task as Task id) (Queue {groups, jobs}) = |
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let |
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val Group (gid, _) = get_group jobs task; |
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val groups' = Inttab.remove_list (op =) (gid, task) groups; |
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val jobs' = IntGraph.del_nodes [id] jobs; |
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in make_queue groups' jobs' end; |
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end; |