author | wenzelm |
Tue, 28 Jul 2009 14:54:53 +0200 | |
changeset 32251 | e586c82fdf69 |
parent 32250 | 3c28e4e578ad |
child 32784 | 1a5dde5079ac |
permissions | -rw-r--r-- |
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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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job: explicit 'ok' status -- false for canceled jobs;
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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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204 |
|
28165 | 205 |
|
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(* dequeue_towards -- adhoc dependencies *) |
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207 |
|
32249 | 208 |
fun dequeue_towards thread deps (queue as Queue {groups, jobs, ...}) = |
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209 |
let |
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fun ready task = |
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211 |
(case Task_Graph.get_node jobs task of |
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(group, Job list) => |
32250 | 213 |
if null (get_deps jobs task) |
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then SOME (task, group, rev list) |
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215 |
else NONE |
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216 |
| _ => NONE); |
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val tasks = filter (can (Task_Graph.get_node jobs)) deps; |
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fun result (res as (task, _, _)) = |
219 |
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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223 |
in |
32093
30996b775a7f
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224 |
(case get_first ready tasks of |
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SOME res => result res |
226 |
| NONE => |
|
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(case get_first (get_first ready o get_deps jobs) tasks of |
32192 | 228 |
SOME res => result res |
32224 | 229 |
| NONE => ((NONE, tasks), queue))) |
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230 |
end; |
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231 |
|
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232 |
|
32221 | 233 |
(* finish *) |
234 |
||
235 |
fun finish task (Queue {groups, jobs, cache}) = |
|
236 |
let |
|
237 |
val group = get_group jobs task; |
|
238 |
val groups' = groups |
|
239 |
|> fold (fn gid => Inttab.remove_list (op =) (gid, task)) (group_ancestry group); |
|
240 |
val jobs' = Task_Graph.del_node task jobs; |
|
241 |
val maximal = null (Task_Graph.imm_succs jobs task); |
|
242 |
val cache' = if maximal then cache else Unknown; |
|
243 |
in (maximal, make_queue groups' jobs' cache') end; |
|
244 |
||
28165 | 245 |
end; |