author | wenzelm |
Mon, 27 Jul 2009 12:00:02 +0200 | |
changeset 32218 | 222f26693757 |
parent 32192 | eb09607094b3 |
child 32221 | fcbd6c9ee9bb |
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 group_id: group -> int |
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val eq_group: group * group -> bool |
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val new_group: group option -> group |
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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 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: queue -> (task * group * (bool -> bool) list) option * queue |
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val dequeue_towards: task list -> queue -> |
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(((task * group * (bool -> bool) list) * task list) 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 is_canceled: group -> bool |
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val cancel_group: group -> exn -> unit |
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val cancel: queue -> group -> bool |
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val cancel_all: queue -> group list |
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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 ref}; |
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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 (), ref []); |
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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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fun cancel_group (Group {status, ...}) exn = CRITICAL (fn () => |
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(case exn of |
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Exn.Interrupt => if null (! status) then status := [exn] else () |
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| _ => change status (cons exn))); |
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fun group_status (Group {parent, status, ...}) = (*non-critical*) |
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! status @ (case parent of NONE => [] | SOME group => group_status group); |
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fun is_canceled (Group {parent, status, ...}) = (*non-critical*) |
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not (null (! status)) orelse (case parent of NONE => false | SOME group => is_canceled 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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(* 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 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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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 (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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186 |
fun deq boundary = |
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187 |
(case Task_Graph.get_first boundary ready jobs of |
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188 |
NONE => (NONE, make_queue groups jobs No_Result) |
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189 |
| SOME (result as (task, _, _)) => |
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190 |
let |
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191 |
val jobs' = set_job task (Running (Thread.self ())) jobs; |
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192 |
val cache' = Result task; |
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193 |
in (SOME result, make_queue groups jobs' cache') end); |
29121 | 194 |
in |
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195 |
(case cache of |
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196 |
Unknown => deq NONE |
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197 |
| Result last => deq (SOME last) |
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198 |
| No_Result => (NONE, queue)) |
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199 |
end; |
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200 |
|
28165 | 201 |
|
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202 |
(* dequeue_towards -- adhoc dependencies *) |
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203 |
|
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204 |
fun dequeue_towards deps (queue as Queue {groups, jobs, ...}) = |
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205 |
let |
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206 |
fun ready task = |
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207 |
(case Task_Graph.get_node jobs task of |
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208 |
(group, Job list) => |
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209 |
if null (Task_Graph.imm_preds jobs task) |
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210 |
then SOME (task, group, rev list) |
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211 |
else NONE |
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212 |
| _ => NONE); |
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213 |
val tasks = filter (can (Task_Graph.get_node jobs)) deps; |
32192 | 214 |
fun result (res as (task, _, _)) = |
215 |
let |
|
216 |
val jobs' = set_job task (Running (Thread.self ())) jobs; |
|
217 |
val cache' = Unknown; |
|
218 |
in (SOME (res, tasks), make_queue groups jobs' cache') end; |
|
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219 |
in |
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220 |
(case get_first ready tasks of |
32192 | 221 |
SOME res => result res |
222 |
| NONE => |
|
223 |
(case get_first (get_first ready o Task_Graph.imm_preds jobs) tasks of |
|
224 |
SOME res => result res |
|
225 |
| NONE => (NONE, queue))) |
|
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226 |
end; |
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227 |
|
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228 |
|
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229 |
(* sporadic interrupts *) |
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230 |
|
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231 |
fun interrupt (Queue {jobs, ...}) task = |
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232 |
(case try (get_job jobs) task of |
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233 |
SOME (Running thread) => SimpleThread.interrupt thread |
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234 |
| _ => ()); |
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235 |
|
29121 | 236 |
fun interrupt_external (queue as Queue {jobs, ...}) str = |
237 |
(case Int.fromString str of |
|
238 |
SOME i => |
|
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|
239 |
(case Task_Graph.get_first NONE |
29121 | 240 |
(fn (task as Task (_, j), _) => if i = j then SOME task else NONE) jobs |
241 |
of SOME task => interrupt queue task | NONE => ()) |
|
242 |
| NONE => ()); |
|
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243 |
|
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244 |
|
29340 | 245 |
(* termination *) |
28165 | 246 |
|
31632 | 247 |
fun finish task (Queue {groups, jobs, cache}) = |
28176
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job: explicit 'ok' status -- false for canceled jobs;
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248 |
let |
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249 |
val group = get_group jobs task; |
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250 |
val groups' = groups |
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251 |
|> fold (fn gid => Inttab.remove_list (op =) (gid, task)) (group_ancestry group); |
29121 | 252 |
val jobs' = Task_Graph.del_node task jobs; |
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enqueue/finish: return minimal/maximal state of this task;
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253 |
val maximal = null (Task_Graph.imm_succs jobs task); |
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254 |
val cache' = if maximal then cache else Unknown; |
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255 |
in (maximal, make_queue groups' jobs' cache') end; |
28165 | 256 |
|
257 |
end; |