author | hoelzl |
Wed, 02 Apr 2014 18:35:01 +0200 | |
changeset 56369 | 2704ca85be98 |
parent 56333 | 38f1422ef473 |
child 57350 | fc4d65afdf13 |
permissions | -rw-r--r-- |
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(* Title: Pure/Concurrent/future.ML |
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Author: Makarius |
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Value-oriented parallelism via futures and promises. See also |
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http://www4.in.tum.de/~wenzelm/papers/parallel-isabelle.pdf |
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http://www4.in.tum.de/~wenzelm/papers/parallel-ml.pdf |
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Notes: |
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* Futures are similar to delayed evaluation, i.e. delay/force is |
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generalized to fork/join. The idea is to model parallel |
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value-oriented computations (not communicating processes). |
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* Forked futures are evaluated spontaneously by a farm of worker |
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threads in the background; join resynchronizes the computation and |
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delivers results (values or exceptions). |
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* The pool of worker threads is limited, usually in correlation with |
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the number of physical cores on the machine. Note that allocation |
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of runtime resources may be distorted either if workers yield CPU |
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time (e.g. via system sleep or wait operations), or if non-worker |
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threads contend for significant runtime resources independently. |
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There is a limited number of replacement worker threads that get |
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activated in certain explicit wait conditions. |
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* Future tasks are organized in groups, which are block-structured. |
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When forking a new new task, the default is to open an individual |
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subgroup, unless some common group is specified explicitly. |
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Failure of one group member causes peer and subgroup members to be |
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interrupted eventually. Interrupted tasks that lack regular |
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result information, will pick up parallel exceptions from the |
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cumulative group context (as Par_Exn). |
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* Future task groups may be canceled: present and future group |
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members will be interrupted eventually. |
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* Promised "passive" futures are fulfilled by external means. There |
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is no associated evaluation task, but other futures can depend on |
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them via regular join operations. |
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*) |
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signature FUTURE = |
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sig |
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type task = Task_Queue.task |
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type group = Task_Queue.group |
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val new_group: group option -> group |
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val worker_task: unit -> task option |
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val worker_group: unit -> group option |
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val the_worker_group: unit -> group |
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val worker_subgroup: unit -> group |
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type 'a future |
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val task_of: 'a future -> task |
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val peek: 'a future -> 'a Exn.result option |
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val is_finished: 'a future -> bool |
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val ML_statistics: bool Unsynchronized.ref |
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val interruptible_task: ('a -> 'b) -> 'a -> 'b |
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val cancel_group: group -> unit |
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val cancel: 'a future -> unit |
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val error_message: Position.T -> (serial * string) * string option -> unit |
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val identify_result: Position.T -> 'a Exn.result -> 'a Exn.result |
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type params = {name: string, group: group option, deps: task list, pri: int, interrupts: bool} |
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val default_params: params |
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val forks: params -> (unit -> 'a) list -> 'a future list |
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val fork: (unit -> 'a) -> 'a future |
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val join_results: 'a future list -> 'a Exn.result list |
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val join_result: 'a future -> 'a Exn.result |
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val joins: 'a future list -> 'a list |
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val join: 'a future -> 'a |
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val join_tasks: task list -> unit |
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val task_context: string -> group -> ('a -> 'b) -> 'a -> 'b |
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val value_result: 'a Exn.result -> 'a future |
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val value: 'a -> 'a future |
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val cond_forks: params -> (unit -> 'a) list -> 'a future list |
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val map: ('a -> 'b) -> 'a future -> 'b future |
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val promise_group: group -> (unit -> unit) -> 'a future |
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val promise: (unit -> unit) -> 'a future |
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val fulfill_result: 'a future -> 'a Exn.result -> unit |
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val fulfill: 'a future -> 'a -> unit |
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val group_snapshot: group -> task list |
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val terminate: group -> unit |
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val shutdown: unit -> unit |
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end; |
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structure Future: FUTURE = |
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struct |
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(** future values **) |
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type task = Task_Queue.task; |
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type group = Task_Queue.group; |
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val new_group = Task_Queue.new_group; |
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(* identifiers *) |
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local |
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val tag = Universal.tag () : task option Universal.tag; |
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in |
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fun worker_task () = the_default NONE (Thread.getLocal tag); |
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fun setmp_worker_task task f x = setmp_thread_data tag (worker_task ()) (SOME task) f x; |
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end; |
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val worker_group = Option.map Task_Queue.group_of_task o worker_task; |
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fun the_worker_group () = |
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(case worker_group () of |
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SOME group => group |
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| NONE => raise Fail "Missing worker thread context"); |
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fun worker_subgroup () = new_group (worker_group ()); |
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fun worker_joining e = |
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(case worker_task () of |
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NONE => e () |
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| SOME task => Task_Queue.joining task e); |
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fun worker_waiting deps e = |
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(case worker_task () of |
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NONE => e () |
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| SOME task => Task_Queue.waiting task deps e); |
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(* datatype future *) |
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type 'a result = 'a Exn.result Single_Assignment.var; |
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datatype 'a future = Future of |
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{promised: bool, |
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task: task, |
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result: 'a result}; |
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fun task_of (Future {task, ...}) = task; |
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fun result_of (Future {result, ...}) = result; |
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fun peek x = Single_Assignment.peek (result_of x); |
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fun is_finished x = is_some (peek x); |
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(** scheduling **) |
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(* synchronization *) |
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val scheduler_event = ConditionVar.conditionVar (); |
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val work_available = ConditionVar.conditionVar (); |
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val work_finished = ConditionVar.conditionVar (); |
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local |
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val lock = Mutex.mutex (); |
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in |
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fun SYNCHRONIZED name = Simple_Thread.synchronized name lock; |
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fun wait cond = (*requires SYNCHRONIZED*) |
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Multithreading.sync_wait NONE NONE cond lock; |
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fun wait_timeout timeout cond = (*requires SYNCHRONIZED*) |
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Multithreading.sync_wait NONE (SOME (Time.+ (Time.now (), timeout))) cond lock; |
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fun signal cond = (*requires SYNCHRONIZED*) |
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ConditionVar.signal cond; |
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fun broadcast cond = (*requires SYNCHRONIZED*) |
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ConditionVar.broadcast cond; |
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end; |
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(* global state *) |
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val queue = Unsynchronized.ref Task_Queue.empty; |
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val next = Unsynchronized.ref 0; |
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val scheduler = Unsynchronized.ref (NONE: Thread.thread option); |
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val canceled = Unsynchronized.ref ([]: group list); |
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val do_shutdown = Unsynchronized.ref false; |
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val max_workers = Unsynchronized.ref 0; |
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val max_active = Unsynchronized.ref 0; |
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val worker_trend = Unsynchronized.ref 0; |
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val status_ticks = Unsynchronized.ref 0; |
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val last_round = Unsynchronized.ref Time.zeroTime; |
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val next_round = seconds 0.05; |
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datatype worker_state = Working | Waiting | Sleeping; |
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val workers = Unsynchronized.ref ([]: (Thread.thread * worker_state Unsynchronized.ref) list); |
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fun count_workers state = (*requires SYNCHRONIZED*) |
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fold (fn (_, state_ref) => fn i => if ! state_ref = state then i + 1 else i) (! workers) 0; |
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(* status *) |
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val ML_statistics = Unsynchronized.ref false; |
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fun report_status () = (*requires SYNCHRONIZED*) |
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if ! ML_statistics then |
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let |
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val {ready, pending, running, passive} = Task_Queue.status (! queue); |
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val total = length (! workers); |
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val active = count_workers Working; |
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val waiting = count_workers Waiting; |
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val stats = |
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[("now", Markup.print_real (Time.toReal (Time.now ()))), |
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("tasks_ready", Markup.print_int ready), |
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("tasks_pending", Markup.print_int pending), |
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("tasks_running", Markup.print_int running), |
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("tasks_passive", Markup.print_int passive), |
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("workers_total", Markup.print_int total), |
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("workers_active", Markup.print_int active), |
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("workers_waiting", Markup.print_int waiting)] @ |
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ML_Statistics.get (); |
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in Output.try_protocol_message (Markup.ML_statistics :: stats) [] end |
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else (); |
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(* cancellation primitives *) |
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fun cancel_now group = (*requires SYNCHRONIZED*) |
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let |
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simplified Future.cancel/cancel_group (again) -- running threads only;
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parents:
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diff
changeset
|
221 |
val running = Task_Queue.cancel (! queue) group; |
49894
69bfd86cc711
more robust cancel_now: avoid shooting yourself in the foot;
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parents:
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diff
changeset
|
222 |
val _ = running |> List.app (fn thread => |
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parents:
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changeset
|
223 |
if Simple_Thread.is_self thread then () |
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parents:
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changeset
|
224 |
else Simple_Thread.interrupt_unsynchronized thread); |
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simplified Future.cancel/cancel_group (again) -- running threads only;
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parents:
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diff
changeset
|
225 |
in running end; |
44341
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purely functional task_queue.ML -- moved actual interrupt_unsynchronized to future.ML;
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parents:
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diff
changeset
|
226 |
|
a93d25fb14fc
purely functional task_queue.ML -- moved actual interrupt_unsynchronized to future.ML;
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parents:
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changeset
|
227 |
fun cancel_all () = (*requires SYNCHRONIZED*) |
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changeset
|
228 |
let |
a93d25fb14fc
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parents:
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changeset
|
229 |
val (groups, threads) = Task_Queue.cancel_all (! queue); |
a93d25fb14fc
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parents:
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changeset
|
230 |
val _ = List.app Simple_Thread.interrupt_unsynchronized threads; |
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parents:
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diff
changeset
|
231 |
in groups end; |
34279
02936e77a07c
tasks of canceled groups are considered "ready" -- enables to purge the queue from tasks depending on unfinished promises (also improves general reactivity);
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parents:
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diff
changeset
|
232 |
|
02936e77a07c
tasks of canceled groups are considered "ready" -- enables to purge the queue from tasks depending on unfinished promises (also improves general reactivity);
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parents:
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diff
changeset
|
233 |
fun cancel_later group = (*requires SYNCHRONIZED*) |
32738 | 234 |
(Unsynchronized.change canceled (insert Task_Queue.eq_group group); |
235 |
broadcast scheduler_event); |
|
29341
6bb007a0f9f2
more reactive scheduler: reduced loop timeout, propagate broadcast interrupt via TaskQueue.cancel_all;
wenzelm
parents:
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diff
changeset
|
236 |
|
44301 | 237 |
fun interruptible_task f x = |
238 |
(if Multithreading.available then |
|
239 |
Multithreading.with_attributes |
|
240 |
(if is_some (worker_task ()) |
|
241 |
then Multithreading.private_interrupts |
|
242 |
else Multithreading.public_interrupts) |
|
243 |
(fn _ => f x) |
|
244 |
else interruptible f x) |
|
245 |
before Multithreading.interrupted (); |
|
246 |
||
247 |
||
44110 | 248 |
(* worker threads *) |
249 |
||
250 |
fun worker_exec (task, jobs) = |
|
28167 | 251 |
let |
41683
73dde8006820
maintain Task_Queue.group within Task_Queue.task;
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changeset
|
252 |
val group = Task_Queue.group_of_task task; |
32102 | 253 |
val valid = not (Task_Queue.is_canceled group); |
41670 | 254 |
val ok = |
255 |
Task_Queue.running task (fn () => |
|
41683
73dde8006820
maintain Task_Queue.group within Task_Queue.task;
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parents:
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diff
changeset
|
256 |
setmp_worker_task task (fn () => |
41670 | 257 |
fold (fn job => fn ok => job valid andalso ok) jobs true) ()); |
50975 | 258 |
val _ = |
259 |
if ! Multithreading.trace >= 2 then |
|
56333
38f1422ef473
support bulk messages consisting of small string segments, which are more healthy to the Poly/ML RTS and might prevent spurious GC crashes such as MTGCProcessMarkPointers::ScanAddressesInObject;
wenzelm
parents:
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diff
changeset
|
260 |
Output.try_protocol_message (Markup.task_statistics :: Task_Queue.task_statistics task) [] |
50975 | 261 |
else (); |
32246 | 262 |
val _ = SYNCHRONIZED "finish" (fn () => |
32219
9a2566d1fdbd
more specific conditions: scheduler_event, work_available, work_finished -- considereably reduces overhead with many threads;
wenzelm
parents:
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diff
changeset
|
263 |
let |
32738 | 264 |
val maximal = Unsynchronized.change_result queue (Task_Queue.finish task); |
44295
e43f0ea90c9a
more focused use of Multithreading.interrupted: retain interrupts within task group boundary, without loss of information;
wenzelm
parents:
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diff
changeset
|
265 |
val test = Exn.capture Multithreading.interrupted (); |
32219
9a2566d1fdbd
more specific conditions: scheduler_event, work_available, work_finished -- considereably reduces overhead with many threads;
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parents:
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diff
changeset
|
266 |
val _ = |
44295
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more focused use of Multithreading.interrupted: retain interrupts within task group boundary, without loss of information;
wenzelm
parents:
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diff
changeset
|
267 |
if ok andalso not (Exn.is_interrupt_exn test) then () |
44299
061599cb6eb0
refined Future.cancel: explicit future allows to join actual cancellation;
wenzelm
parents:
44298
diff
changeset
|
268 |
else if null (cancel_now group) then () |
34279
02936e77a07c
tasks of canceled groups are considered "ready" -- enables to purge the queue from tasks depending on unfinished promises (also improves general reactivity);
wenzelm
parents:
34277
diff
changeset
|
269 |
else cancel_later group; |
32219
9a2566d1fdbd
more specific conditions: scheduler_event, work_available, work_finished -- considereably reduces overhead with many threads;
wenzelm
parents:
32186
diff
changeset
|
270 |
val _ = broadcast work_finished; |
33413
cb409680dda8
avoid broadcast work_available, use daisy-chained signal instead;
wenzelm
parents:
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diff
changeset
|
271 |
val _ = if maximal then () else signal work_available; |
32219
9a2566d1fdbd
more specific conditions: scheduler_event, work_available, work_finished -- considereably reduces overhead with many threads;
wenzelm
parents:
32186
diff
changeset
|
272 |
in () end); |
28167 | 273 |
in () end; |
274 |
||
33410
e351f4c1f18c
worker activity: distinguish between waiting (formerly active) and sleeping;
wenzelm
parents:
33409
diff
changeset
|
275 |
fun worker_wait active cond = (*requires SYNCHRONIZED*) |
52558
271663ddf289
allow worker guest threads, which participate actively in future joins, but are outside thread accounting;
wenzelm
parents:
51990
diff
changeset
|
276 |
(case AList.lookup Thread.equal (! workers) (Thread.self ()) of |
271663ddf289
allow worker guest threads, which participate actively in future joins, but are outside thread accounting;
wenzelm
parents:
51990
diff
changeset
|
277 |
SOME state => |
271663ddf289
allow worker guest threads, which participate actively in future joins, but are outside thread accounting;
wenzelm
parents:
51990
diff
changeset
|
278 |
(state := (if active then Waiting else Sleeping); |
271663ddf289
allow worker guest threads, which participate actively in future joins, but are outside thread accounting;
wenzelm
parents:
51990
diff
changeset
|
279 |
wait cond; |
271663ddf289
allow worker guest threads, which participate actively in future joins, but are outside thread accounting;
wenzelm
parents:
51990
diff
changeset
|
280 |
state := Working) |
271663ddf289
allow worker guest threads, which participate actively in future joins, but are outside thread accounting;
wenzelm
parents:
51990
diff
changeset
|
281 |
| NONE => ignore (wait cond)); |
28162 | 282 |
|
33415
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
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parents:
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diff
changeset
|
283 |
fun worker_next () = (*requires SYNCHRONIZED*) |
33406
1ddcb8472bd2
slightly leaner and more direct control of worker activity etc.;
wenzelm
parents:
33061
diff
changeset
|
284 |
if length (! workers) > ! max_workers then |
1ddcb8472bd2
slightly leaner and more direct control of worker activity etc.;
wenzelm
parents:
33061
diff
changeset
|
285 |
(Unsynchronized.change workers (AList.delete Thread.equal (Thread.self ())); |
33415
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
286 |
signal work_available; |
28167 | 287 |
NONE) |
33410
e351f4c1f18c
worker activity: distinguish between waiting (formerly active) and sleeping;
wenzelm
parents:
33409
diff
changeset
|
288 |
else if count_workers Working > ! max_active then |
33415
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
289 |
(worker_wait false work_available; worker_next ()) |
28166
43087721a66e
moved task, thread_data, group, queue to task_queue.ML;
wenzelm
parents:
28163
diff
changeset
|
290 |
else |
32738 | 291 |
(case Unsynchronized.change_result queue (Task_Queue.dequeue (Thread.self ())) of |
33415
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
292 |
NONE => (worker_wait false work_available; worker_next ()) |
33413
cb409680dda8
avoid broadcast work_available, use daisy-chained signal instead;
wenzelm
parents:
33411
diff
changeset
|
293 |
| some => (signal work_available; some)); |
28156 | 294 |
|
28167 | 295 |
fun worker_loop name = |
33415
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
296 |
(case SYNCHRONIZED name (fn () => worker_next ()) of |
29119 | 297 |
NONE => () |
44295
e43f0ea90c9a
more focused use of Multithreading.interrupted: retain interrupts within task group boundary, without loss of information;
wenzelm
parents:
44294
diff
changeset
|
298 |
| SOME work => (worker_exec work; worker_loop name)); |
28156 | 299 |
|
33407
1427333220bc
worker_next: ensure that work_available is passed on before sleeping (was occasionally lost when worker configuration changed, causing scheduler deadlock);
wenzelm
parents:
33406
diff
changeset
|
300 |
fun worker_start name = (*requires SYNCHRONIZED*) |
37216
3165bc303f66
modernized some structure names, keeping a few legacy aliases;
wenzelm
parents:
37182
diff
changeset
|
301 |
Unsynchronized.change workers (cons (Simple_Thread.fork false (fn () => worker_loop name), |
33410
e351f4c1f18c
worker activity: distinguish between waiting (formerly active) and sleeping;
wenzelm
parents:
33409
diff
changeset
|
302 |
Unsynchronized.ref Working)); |
28156 | 303 |
|
304 |
||
305 |
(* scheduler *) |
|
306 |
||
28206
bcd48c6897d4
eliminated requests, use global state variables uniformly;
wenzelm
parents:
28203
diff
changeset
|
307 |
fun scheduler_next () = (*requires SYNCHRONIZED*) |
28156 | 308 |
let |
33407
1427333220bc
worker_next: ensure that work_available is passed on before sleeping (was occasionally lost when worker configuration changed, causing scheduler deadlock);
wenzelm
parents:
33406
diff
changeset
|
309 |
val now = Time.now (); |
1427333220bc
worker_next: ensure that work_available is passed on before sleeping (was occasionally lost when worker configuration changed, causing scheduler deadlock);
wenzelm
parents:
33406
diff
changeset
|
310 |
val tick = Time.<= (Time.+ (! last_round, next_round), now); |
1427333220bc
worker_next: ensure that work_available is passed on before sleeping (was occasionally lost when worker configuration changed, causing scheduler deadlock);
wenzelm
parents:
33406
diff
changeset
|
311 |
val _ = if tick then last_round := now else (); |
1427333220bc
worker_next: ensure that work_available is passed on before sleeping (was occasionally lost when worker configuration changed, causing scheduler deadlock);
wenzelm
parents:
33406
diff
changeset
|
312 |
|
33415
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
313 |
|
50280 | 314 |
(* runtime status *) |
33415
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
315 |
|
32226 | 316 |
val _ = |
51046 | 317 |
if tick then Unsynchronized.change status_ticks (fn i => i + 1) else (); |
33407
1427333220bc
worker_next: ensure that work_available is passed on before sleeping (was occasionally lost when worker configuration changed, causing scheduler deadlock);
wenzelm
parents:
33406
diff
changeset
|
318 |
val _ = |
51046 | 319 |
if tick andalso ! status_ticks mod (if ! Multithreading.trace >= 1 then 2 else 10) = 0 |
320 |
then report_status () else (); |
|
32053 | 321 |
|
28191 | 322 |
val _ = |
32219
9a2566d1fdbd
more specific conditions: scheduler_event, work_available, work_finished -- considereably reduces overhead with many threads;
wenzelm
parents:
32186
diff
changeset
|
323 |
if forall (Thread.isActive o #1) (! workers) then () |
32095 | 324 |
else |
33409 | 325 |
let |
37682 | 326 |
val (alive, dead) = List.partition (Thread.isActive o #1) (! workers); |
33409 | 327 |
val _ = workers := alive; |
328 |
in |
|
329 |
Multithreading.tracing 0 (fn () => |
|
51279 | 330 |
"SCHEDULER: disposed " ^ string_of_int (length dead) ^ " dead worker threads") |
33409 | 331 |
end; |
28191 | 332 |
|
33415
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
333 |
|
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
334 |
(* worker pool adjustments *) |
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
335 |
|
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
336 |
val max_active0 = ! max_active; |
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
337 |
val max_workers0 = ! max_workers; |
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
338 |
|
28206
bcd48c6897d4
eliminated requests, use global state variables uniformly;
wenzelm
parents:
28203
diff
changeset
|
339 |
val m = if ! do_shutdown then 0 else Multithreading.max_threads_value (); |
33406
1ddcb8472bd2
slightly leaner and more direct control of worker activity etc.;
wenzelm
parents:
33061
diff
changeset
|
340 |
val _ = max_active := m; |
1ddcb8472bd2
slightly leaner and more direct control of worker activity etc.;
wenzelm
parents:
33061
diff
changeset
|
341 |
|
33411
a07558eb5029
worker_next: treat wait for work_available as Sleeping, not Waiting;
wenzelm
parents:
33410
diff
changeset
|
342 |
val mm = |
a07558eb5029
worker_next: treat wait for work_available as Sleeping, not Waiting;
wenzelm
parents:
33410
diff
changeset
|
343 |
if ! do_shutdown then 0 |
33413
cb409680dda8
avoid broadcast work_available, use daisy-chained signal instead;
wenzelm
parents:
33411
diff
changeset
|
344 |
else Int.min (Int.max (count_workers Working + 2 * count_workers Waiting, m), 4 * m); |
33411
a07558eb5029
worker_next: treat wait for work_available as Sleeping, not Waiting;
wenzelm
parents:
33410
diff
changeset
|
345 |
val _ = |
a07558eb5029
worker_next: treat wait for work_available as Sleeping, not Waiting;
wenzelm
parents:
33410
diff
changeset
|
346 |
if tick andalso mm > ! max_workers then |
a07558eb5029
worker_next: treat wait for work_available as Sleeping, not Waiting;
wenzelm
parents:
33410
diff
changeset
|
347 |
Unsynchronized.change worker_trend (fn w => if w < 0 then 0 else w + 1) |
a07558eb5029
worker_next: treat wait for work_available as Sleeping, not Waiting;
wenzelm
parents:
33410
diff
changeset
|
348 |
else if tick andalso mm < ! max_workers then |
a07558eb5029
worker_next: treat wait for work_available as Sleeping, not Waiting;
wenzelm
parents:
33410
diff
changeset
|
349 |
Unsynchronized.change worker_trend (fn w => if w > 0 then 0 else w - 1) |
a07558eb5029
worker_next: treat wait for work_available as Sleeping, not Waiting;
wenzelm
parents:
33410
diff
changeset
|
350 |
else (); |
a07558eb5029
worker_next: treat wait for work_available as Sleeping, not Waiting;
wenzelm
parents:
33410
diff
changeset
|
351 |
val _ = |
33415
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
352 |
if mm = 0 orelse ! worker_trend > 50 orelse ! worker_trend < ~50 then |
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
353 |
max_workers := mm |
44173
aaaa13e297dc
immediate fork of initial workers -- avoid 5 ticks (250ms) for adaptive scheme (a07558eb5029);
wenzelm
parents:
44115
diff
changeset
|
354 |
else if ! worker_trend > 5 andalso ! max_workers < 2 * m orelse ! max_workers = 0 then |
33415
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
355 |
max_workers := Int.min (mm, 2 * m) |
33411
a07558eb5029
worker_next: treat wait for work_available as Sleeping, not Waiting;
wenzelm
parents:
33410
diff
changeset
|
356 |
else (); |
33406
1ddcb8472bd2
slightly leaner and more direct control of worker activity etc.;
wenzelm
parents:
33061
diff
changeset
|
357 |
|
33407
1427333220bc
worker_next: ensure that work_available is passed on before sleeping (was occasionally lost when worker configuration changed, causing scheduler deadlock);
wenzelm
parents:
33406
diff
changeset
|
358 |
val missing = ! max_workers - length (! workers); |
28203 | 359 |
val _ = |
33407
1427333220bc
worker_next: ensure that work_available is passed on before sleeping (was occasionally lost when worker configuration changed, causing scheduler deadlock);
wenzelm
parents:
33406
diff
changeset
|
360 |
if missing > 0 then |
33415
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
361 |
funpow missing (fn () => |
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
362 |
ignore (worker_start ("worker " ^ string_of_int (Unsynchronized.inc next)))) () |
28203 | 363 |
else (); |
28206
bcd48c6897d4
eliminated requests, use global state variables uniformly;
wenzelm
parents:
28203
diff
changeset
|
364 |
|
33415
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
365 |
val _ = |
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
366 |
if ! max_active = max_active0 andalso ! max_workers = max_workers0 then () |
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
367 |
else signal work_available; |
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
368 |
|
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
369 |
|
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
370 |
(* canceled groups *) |
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
371 |
|
32225
d5d6f47fb018
cancel: improved reactivity due to more careful broadcasting;
wenzelm
parents:
32224
diff
changeset
|
372 |
val _ = |
d5d6f47fb018
cancel: improved reactivity due to more careful broadcasting;
wenzelm
parents:
32224
diff
changeset
|
373 |
if null (! canceled) then () |
32293 | 374 |
else |
375 |
(Multithreading.tracing 1 (fn () => |
|
376 |
string_of_int (length (! canceled)) ^ " canceled groups"); |
|
44299
061599cb6eb0
refined Future.cancel: explicit future allows to join actual cancellation;
wenzelm
parents:
44298
diff
changeset
|
377 |
Unsynchronized.change canceled (filter_out (null o cancel_now)); |
51281
c05f7e1dd602
signal work_available should be sufficient to initiate daisy-chained workers, and lead to separate broadcast work_finished eventually -- NB: broadcasting all worker threads tends to burn parallel CPU cycles;
wenzelm
parents:
51280
diff
changeset
|
378 |
signal work_available); |
28206
bcd48c6897d4
eliminated requests, use global state variables uniformly;
wenzelm
parents:
28203
diff
changeset
|
379 |
|
33415
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
380 |
|
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
381 |
(* delay loop *) |
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
382 |
|
32295
400cc493d466
renamed Multithreading.regular_interrupts to Multithreading.public_interrupts;
wenzelm
parents:
32293
diff
changeset
|
383 |
val _ = Exn.release (wait_timeout next_round scheduler_event); |
28167 | 384 |
|
33415
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
385 |
|
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
386 |
(* shutdown *) |
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
387 |
|
34277
7325a5e3587f
added Future.promise/fulfill -- promised futures that are fulfilled by external means;
wenzelm
parents:
33416
diff
changeset
|
388 |
val _ = if Task_Queue.all_passive (! queue) then do_shutdown := true else (); |
32219
9a2566d1fdbd
more specific conditions: scheduler_event, work_available, work_finished -- considereably reduces overhead with many threads;
wenzelm
parents:
32186
diff
changeset
|
389 |
val continue = not (! do_shutdown andalso null (! workers)); |
50429
f8cd5e53653b
final report_status within SYNCHRONIZED part of scheduler loop: required for sanity of data;
wenzelm
parents:
50280
diff
changeset
|
390 |
val _ = if continue then () else (report_status (); scheduler := NONE); |
33415
352fe8e9162d
worker_next: plain signalling via work_available only, not scheduler_event;
wenzelm
parents:
33413
diff
changeset
|
391 |
|
32219
9a2566d1fdbd
more specific conditions: scheduler_event, work_available, work_finished -- considereably reduces overhead with many threads;
wenzelm
parents:
32186
diff
changeset
|
392 |
val _ = broadcast scheduler_event; |
32295
400cc493d466
renamed Multithreading.regular_interrupts to Multithreading.public_interrupts;
wenzelm
parents:
32293
diff
changeset
|
393 |
in continue end |
39232
69c6d3e87660
more abstract treatment of interrupts in structure Exn -- hardly ever need to mention Interrupt literally;
wenzelm
parents:
38236
diff
changeset
|
394 |
handle exn => |
69c6d3e87660
more abstract treatment of interrupts in structure Exn -- hardly ever need to mention Interrupt literally;
wenzelm
parents:
38236
diff
changeset
|
395 |
if Exn.is_interrupt exn then |
51279 | 396 |
(Multithreading.tracing 1 (fn () => "SCHEDULER: Interrupt"); |
44341
a93d25fb14fc
purely functional task_queue.ML -- moved actual interrupt_unsynchronized to future.ML;
wenzelm
parents:
44330
diff
changeset
|
397 |
List.app cancel_later (cancel_all ()); |
51281
c05f7e1dd602
signal work_available should be sufficient to initiate daisy-chained workers, and lead to separate broadcast work_finished eventually -- NB: broadcasting all worker threads tends to burn parallel CPU cycles;
wenzelm
parents:
51280
diff
changeset
|
398 |
signal work_available; true) |
39232
69c6d3e87660
more abstract treatment of interrupts in structure Exn -- hardly ever need to mention Interrupt literally;
wenzelm
parents:
38236
diff
changeset
|
399 |
else reraise exn; |
32295
400cc493d466
renamed Multithreading.regular_interrupts to Multithreading.public_interrupts;
wenzelm
parents:
32293
diff
changeset
|
400 |
|
28206
bcd48c6897d4
eliminated requests, use global state variables uniformly;
wenzelm
parents:
28203
diff
changeset
|
401 |
fun scheduler_loop () = |
44173
aaaa13e297dc
immediate fork of initial workers -- avoid 5 ticks (250ms) for adaptive scheme (a07558eb5029);
wenzelm
parents:
44115
diff
changeset
|
402 |
(while |
33416
13d00799fe49
scheduler: clarified interrupt attributes and handling;
wenzelm
parents:
33415
diff
changeset
|
403 |
Multithreading.with_attributes |
13d00799fe49
scheduler: clarified interrupt attributes and handling;
wenzelm
parents:
33415
diff
changeset
|
404 |
(Multithreading.sync_interrupts Multithreading.public_interrupts) |
13d00799fe49
scheduler: clarified interrupt attributes and handling;
wenzelm
parents:
33415
diff
changeset
|
405 |
(fn _ => SYNCHRONIZED "scheduler" (fn () => scheduler_next ())) |
50429
f8cd5e53653b
final report_status within SYNCHRONIZED part of scheduler loop: required for sanity of data;
wenzelm
parents:
50280
diff
changeset
|
406 |
do (); last_round := Time.zeroTime); |
28156 | 407 |
|
28203 | 408 |
fun scheduler_active () = (*requires SYNCHRONIZED*) |
409 |
(case ! scheduler of NONE => false | SOME thread => Thread.isActive thread); |
|
410 |
||
32228
7622c03141b0
scheduler: shutdown spontaneously (after some delay) if queue is empty;
wenzelm
parents:
32227
diff
changeset
|
411 |
fun scheduler_check () = (*requires SYNCHRONIZED*) |
7622c03141b0
scheduler: shutdown spontaneously (after some delay) if queue is empty;
wenzelm
parents:
32227
diff
changeset
|
412 |
(do_shutdown := false; |
32248
0241916a5f06
more precise treatment of scheduler_event: continous pulse (50ms) instead of flooding, which was burning many CPU cycles in spare threads;
wenzelm
parents:
32247
diff
changeset
|
413 |
if scheduler_active () then () |
37216
3165bc303f66
modernized some structure names, keeping a few legacy aliases;
wenzelm
parents:
37182
diff
changeset
|
414 |
else scheduler := SOME (Simple_Thread.fork false scheduler_loop)); |
28156 | 415 |
|
44301 | 416 |
|
417 |
||
418 |
(** futures **) |
|
419 |
||
420 |
(* cancel *) |
|
421 |
||
49906 | 422 |
fun cancel_group_unsynchronized group = (*requires SYNCHRONIZED*) |
44299
061599cb6eb0
refined Future.cancel: explicit future allows to join actual cancellation;
wenzelm
parents:
44298
diff
changeset
|
423 |
let |
47421
9624408d8827
always signal after cancel_group: passive tasks may have become active;
wenzelm
parents:
47404
diff
changeset
|
424 |
val _ = if null (cancel_now group) then () else cancel_later group; |
9624408d8827
always signal after cancel_group: passive tasks may have become active;
wenzelm
parents:
47404
diff
changeset
|
425 |
val _ = signal work_available; |
9624408d8827
always signal after cancel_group: passive tasks may have become active;
wenzelm
parents:
47404
diff
changeset
|
426 |
val _ = scheduler_check (); |
49906 | 427 |
in () end; |
428 |
||
429 |
fun cancel_group group = |
|
430 |
SYNCHRONIZED "cancel_group" (fn () => cancel_group_unsynchronized group); |
|
44299
061599cb6eb0
refined Future.cancel: explicit future allows to join actual cancellation;
wenzelm
parents:
44298
diff
changeset
|
431 |
|
44301 | 432 |
fun cancel x = cancel_group (Task_Queue.group_of_task (task_of x)); |
29366 | 433 |
|
28156 | 434 |
|
50914
fe4714886d92
identify future results more carefully, to avoid odd duplication of error messages, notably from forked goals;
wenzelm
parents:
50911
diff
changeset
|
435 |
(* results *) |
fe4714886d92
identify future results more carefully, to avoid odd duplication of error messages, notably from forked goals;
wenzelm
parents:
50911
diff
changeset
|
436 |
|
56333
38f1422ef473
support bulk messages consisting of small string segments, which are more healthy to the Poly/ML RTS and might prevent spurious GC crashes such as MTGCProcessMarkPointers::ScanAddressesInObject;
wenzelm
parents:
54671
diff
changeset
|
437 |
fun error_message pos ((serial, msg), exec_id) = |
50916
fd902b616b48
proper runtime position (cf. fe4714886d92 and Toplevel.error_msg) -- to make error messages actually appear in the document;
wenzelm
parents:
50914
diff
changeset
|
438 |
Position.setmp_thread_data pos (fn () => |
50931
a7484a7b6c8a
clarified Future.error_msg: slightly more robust id check, actually suppress displaced messages;
wenzelm
parents:
50916
diff
changeset
|
439 |
let val id = Position.get_id pos in |
a7484a7b6c8a
clarified Future.error_msg: slightly more robust id check, actually suppress displaced messages;
wenzelm
parents:
50916
diff
changeset
|
440 |
if is_none id orelse is_none exec_id orelse id = exec_id |
54387 | 441 |
then Output.error_message' (serial, msg) else () |
50931
a7484a7b6c8a
clarified Future.error_msg: slightly more robust id check, actually suppress displaced messages;
wenzelm
parents:
50916
diff
changeset
|
442 |
end) (); |
44110 | 443 |
|
50914
fe4714886d92
identify future results more carefully, to avoid odd duplication of error messages, notably from forked goals;
wenzelm
parents:
50911
diff
changeset
|
444 |
fun identify_result pos res = |
fe4714886d92
identify future results more carefully, to avoid odd duplication of error messages, notably from forked goals;
wenzelm
parents:
50911
diff
changeset
|
445 |
(case res of |
fe4714886d92
identify future results more carefully, to avoid odd duplication of error messages, notably from forked goals;
wenzelm
parents:
50911
diff
changeset
|
446 |
Exn.Exn exn => |
fe4714886d92
identify future results more carefully, to avoid odd duplication of error messages, notably from forked goals;
wenzelm
parents:
50911
diff
changeset
|
447 |
let val exec_id = |
fe4714886d92
identify future results more carefully, to avoid odd duplication of error messages, notably from forked goals;
wenzelm
parents:
50911
diff
changeset
|
448 |
(case Position.get_id pos of |
fe4714886d92
identify future results more carefully, to avoid odd duplication of error messages, notably from forked goals;
wenzelm
parents:
50911
diff
changeset
|
449 |
NONE => [] |
fe4714886d92
identify future results more carefully, to avoid odd duplication of error messages, notably from forked goals;
wenzelm
parents:
50911
diff
changeset
|
450 |
| SOME id => [(Markup.exec_idN, id)]) |
fe4714886d92
identify future results more carefully, to avoid odd duplication of error messages, notably from forked goals;
wenzelm
parents:
50911
diff
changeset
|
451 |
in Exn.Exn (Par_Exn.identify exec_id exn) end |
fe4714886d92
identify future results more carefully, to avoid odd duplication of error messages, notably from forked goals;
wenzelm
parents:
50911
diff
changeset
|
452 |
| _ => res); |
fe4714886d92
identify future results more carefully, to avoid odd duplication of error messages, notably from forked goals;
wenzelm
parents:
50911
diff
changeset
|
453 |
|
fe4714886d92
identify future results more carefully, to avoid odd duplication of error messages, notably from forked goals;
wenzelm
parents:
50911
diff
changeset
|
454 |
fun assign_result group result res = |
44110 | 455 |
let |
456 |
val _ = Single_Assignment.assign result res |
|
457 |
handle exn as Fail _ => |
|
458 |
(case Single_Assignment.peek result of |
|
459 |
SOME (Exn.Exn e) => reraise (if Exn.is_interrupt e then e else exn) |
|
460 |
| _ => reraise exn); |
|
461 |
val ok = |
|
462 |
(case the (Single_Assignment.peek result) of |
|
44111
2d16c693d536
synchronized cancel and flushing of Multithreading.interrupted state, to ensure that interrupts stay within task boundaries;
wenzelm
parents:
44110
diff
changeset
|
463 |
Exn.Exn exn => |
2d16c693d536
synchronized cancel and flushing of Multithreading.interrupted state, to ensure that interrupts stay within task boundaries;
wenzelm
parents:
44110
diff
changeset
|
464 |
(SYNCHRONIZED "cancel" (fn () => Task_Queue.cancel_group group exn); false) |
44110 | 465 |
| Exn.Res _ => true); |
466 |
in ok end; |
|
467 |
||
50914
fe4714886d92
identify future results more carefully, to avoid odd duplication of error messages, notably from forked goals;
wenzelm
parents:
50911
diff
changeset
|
468 |
|
fe4714886d92
identify future results more carefully, to avoid odd duplication of error messages, notably from forked goals;
wenzelm
parents:
50911
diff
changeset
|
469 |
(* future jobs *) |
fe4714886d92
identify future results more carefully, to avoid odd duplication of error messages, notably from forked goals;
wenzelm
parents:
50911
diff
changeset
|
470 |
|
54649
99b9249b3e05
more official task context via Task_Queue.enroll, which is required to participate in group cancellation (e.g. to terminate command exec);
wenzelm
parents:
54637
diff
changeset
|
471 |
fun future_job group atts (e: unit -> 'a) = |
44110 | 472 |
let |
473 |
val result = Single_Assignment.var "future" : 'a result; |
|
474 |
val pos = Position.thread_data (); |
|
475 |
fun job ok = |
|
476 |
let |
|
477 |
val res = |
|
478 |
if ok then |
|
479 |
Exn.capture (fn () => |
|
54649
99b9249b3e05
more official task context via Task_Queue.enroll, which is required to participate in group cancellation (e.g. to terminate command exec);
wenzelm
parents:
54637
diff
changeset
|
480 |
Multithreading.with_attributes atts (fn _ => Position.setmp_thread_data pos e ())) () |
44110 | 481 |
else Exn.interrupt_exn; |
50914
fe4714886d92
identify future results more carefully, to avoid odd duplication of error messages, notably from forked goals;
wenzelm
parents:
50911
diff
changeset
|
482 |
in assign_result group result (identify_result pos res) end; |
44110 | 483 |
in (result, job) end; |
484 |
||
485 |
||
29366 | 486 |
(* fork *) |
487 |
||
44427 | 488 |
type params = {name: string, group: group option, deps: task list, pri: int, interrupts: bool}; |
489 |
val default_params: params = {name = "", group = NONE, deps = [], pri = 0, interrupts = true}; |
|
44113 | 490 |
|
44427 | 491 |
fun forks ({name, group, deps, pri, interrupts}: params) es = |
41674 | 492 |
if null es then [] |
493 |
else |
|
494 |
let |
|
495 |
val grp = |
|
496 |
(case group of |
|
497 |
NONE => worker_subgroup () |
|
498 |
| SOME grp => grp); |
|
41708 | 499 |
fun enqueue e queue = |
41674 | 500 |
let |
54649
99b9249b3e05
more official task context via Task_Queue.enroll, which is required to participate in group cancellation (e.g. to terminate command exec);
wenzelm
parents:
54637
diff
changeset
|
501 |
val atts = |
99b9249b3e05
more official task context via Task_Queue.enroll, which is required to participate in group cancellation (e.g. to terminate command exec);
wenzelm
parents:
54637
diff
changeset
|
502 |
if interrupts |
99b9249b3e05
more official task context via Task_Queue.enroll, which is required to participate in group cancellation (e.g. to terminate command exec);
wenzelm
parents:
54637
diff
changeset
|
503 |
then Multithreading.private_interrupts |
99b9249b3e05
more official task context via Task_Queue.enroll, which is required to participate in group cancellation (e.g. to terminate command exec);
wenzelm
parents:
54637
diff
changeset
|
504 |
else Multithreading.no_interrupts; |
99b9249b3e05
more official task context via Task_Queue.enroll, which is required to participate in group cancellation (e.g. to terminate command exec);
wenzelm
parents:
54637
diff
changeset
|
505 |
val (result, job) = future_job grp atts e; |
41708 | 506 |
val (task, queue') = Task_Queue.enqueue name grp deps pri job queue; |
41683
73dde8006820
maintain Task_Queue.group within Task_Queue.task;
wenzelm
parents:
41681
diff
changeset
|
507 |
val future = Future {promised = false, task = task, result = result}; |
41708 | 508 |
in (future, queue') end; |
41674 | 509 |
in |
510 |
SYNCHRONIZED "enqueue" (fn () => |
|
511 |
let |
|
41708 | 512 |
val (futures, queue') = fold_map enqueue es (! queue); |
513 |
val _ = queue := queue'; |
|
514 |
val minimal = forall (not o Task_Queue.known_task queue') deps; |
|
41674 | 515 |
val _ = if minimal then signal work_available else (); |
516 |
val _ = scheduler_check (); |
|
517 |
in futures end) |
|
518 |
end; |
|
28162 | 519 |
|
50983 | 520 |
fun fork e = |
521 |
(singleton o forks) {name = "fork", group = NONE, deps = [], pri = 0, interrupts = true} e; |
|
28186 | 522 |
|
523 |
||
29366 | 524 |
(* join *) |
525 |
||
32099 | 526 |
fun get_result x = |
527 |
(case peek x of |
|
37852
a902f158b4fc
eliminated old-style sys_error/SYS_ERROR in favour of exception Fail -- after careful checking that there is no overlap with existing handling of that;
wenzelm
parents:
37690
diff
changeset
|
528 |
NONE => Exn.Exn (Fail "Unfinished future") |
39232
69c6d3e87660
more abstract treatment of interrupts in structure Exn -- hardly ever need to mention Interrupt literally;
wenzelm
parents:
38236
diff
changeset
|
529 |
| SOME res => |
69c6d3e87660
more abstract treatment of interrupts in structure Exn -- hardly ever need to mention Interrupt literally;
wenzelm
parents:
38236
diff
changeset
|
530 |
if Exn.is_interrupt_exn res then |
44247 | 531 |
(case Task_Queue.group_status (Task_Queue.group_of_task (task_of x)) of |
53190
5d92649a310e
simplified Goal.forked_proofs: status is determined via group instead of dummy future (see also Pure/PIDE/execution.ML);
wenzelm
parents:
53189
diff
changeset
|
532 |
[] => res |
5d92649a310e
simplified Goal.forked_proofs: status is determined via group instead of dummy future (see also Pure/PIDE/execution.ML);
wenzelm
parents:
53189
diff
changeset
|
533 |
| exns => Exn.Exn (Par_Exn.make exns)) |
39232
69c6d3e87660
more abstract treatment of interrupts in structure Exn -- hardly ever need to mention Interrupt literally;
wenzelm
parents:
38236
diff
changeset
|
534 |
else res); |
28186 | 535 |
|
49935
d1ecb3554b25
clarified Future.map (again): finished value is mapped in-place, which saves task structures and changes error behaviour slightly (tolerance against canceled group of old value etc.);
wenzelm
parents:
49910
diff
changeset
|
536 |
local |
d1ecb3554b25
clarified Future.map (again): finished value is mapped in-place, which saves task structures and changes error behaviour slightly (tolerance against canceled group of old value etc.);
wenzelm
parents:
49910
diff
changeset
|
537 |
|
32095 | 538 |
fun join_next deps = (*requires SYNCHRONIZED*) |
41695
afdbec23b92b
eliminated slightly odd abstract type Task_Queue.deps;
wenzelm
parents:
41683
diff
changeset
|
539 |
if null deps then NONE |
32224 | 540 |
else |
41681
b5d7b15166bf
Future.join_results: discontinued post-hoc recording of dynamic dependencies;
wenzelm
parents:
41680
diff
changeset
|
541 |
(case Unsynchronized.change_result queue (Task_Queue.dequeue_deps (Thread.self ()) deps) of |
41695
afdbec23b92b
eliminated slightly odd abstract type Task_Queue.deps;
wenzelm
parents:
41683
diff
changeset
|
542 |
(NONE, []) => NONE |
afdbec23b92b
eliminated slightly odd abstract type Task_Queue.deps;
wenzelm
parents:
41683
diff
changeset
|
543 |
| (NONE, deps') => |
afdbec23b92b
eliminated slightly odd abstract type Task_Queue.deps;
wenzelm
parents:
41683
diff
changeset
|
544 |
(worker_waiting deps' (fn () => worker_wait true work_finished); join_next deps') |
32224 | 545 |
| (SOME work, deps') => SOME (work, deps')); |
32095 | 546 |
|
32814
81897d30b97f
added Task_Queue.depend (again) -- light-weight version for transitive graph;
wenzelm
parents:
32738
diff
changeset
|
547 |
fun execute_work NONE = () |
44110 | 548 |
| execute_work (SOME (work, deps')) = |
549 |
(worker_joining (fn () => worker_exec work); join_work deps') |
|
32814
81897d30b97f
added Task_Queue.depend (again) -- light-weight version for transitive graph;
wenzelm
parents:
32738
diff
changeset
|
550 |
and join_work deps = |
43538
de5c79682b56
more robust join_results: join_work needs to be uninterruptible, otherwise the task being dequeued by join_next might be never executed/finished!
wenzelm
parents:
42128
diff
changeset
|
551 |
Multithreading.with_attributes Multithreading.no_interrupts |
de5c79682b56
more robust join_results: join_work needs to be uninterruptible, otherwise the task being dequeued by join_next might be never executed/finished!
wenzelm
parents:
42128
diff
changeset
|
552 |
(fn _ => execute_work (SYNCHRONIZED "join" (fn () => join_next deps))); |
32814
81897d30b97f
added Task_Queue.depend (again) -- light-weight version for transitive graph;
wenzelm
parents:
32738
diff
changeset
|
553 |
|
29551
95e469919c3e
join_results: when dependencies are resulved (but not finished yet),
wenzelm
parents:
29431
diff
changeset
|
554 |
in |
95e469919c3e
join_results: when dependencies are resulved (but not finished yet),
wenzelm
parents:
29431
diff
changeset
|
555 |
|
29366 | 556 |
fun join_results xs = |
41679 | 557 |
let |
558 |
val _ = |
|
559 |
if forall is_finished xs then () |
|
560 |
else if Multithreading.self_critical () then |
|
52603 | 561 |
raise Fail "Cannot join future values within critical section" |
41695
afdbec23b92b
eliminated slightly odd abstract type Task_Queue.deps;
wenzelm
parents:
41683
diff
changeset
|
562 |
else if is_some (worker_task ()) then join_work (map task_of xs) |
41681
b5d7b15166bf
Future.join_results: discontinued post-hoc recording of dynamic dependencies;
wenzelm
parents:
41680
diff
changeset
|
563 |
else List.app (ignore o Single_Assignment.await o result_of) xs; |
41679 | 564 |
in map get_result xs end; |
28186 | 565 |
|
29551
95e469919c3e
join_results: when dependencies are resulved (but not finished yet),
wenzelm
parents:
29431
diff
changeset
|
566 |
end; |
95e469919c3e
join_results: when dependencies are resulved (but not finished yet),
wenzelm
parents:
29431
diff
changeset
|
567 |
|
28647
8068cdc84e7e
join_results: allow CRITICAL join of finished futures;
wenzelm
parents:
28645
diff
changeset
|
568 |
fun join_result x = singleton join_results x; |
44330 | 569 |
fun joins xs = Par_Exn.release_all (join_results xs); |
28647
8068cdc84e7e
join_results: allow CRITICAL join of finished futures;
wenzelm
parents:
28645
diff
changeset
|
570 |
fun join x = Exn.release (join_result x); |
28156 | 571 |
|
54369 | 572 |
fun join_tasks tasks = |
573 |
if null tasks then () |
|
574 |
else |
|
575 |
(singleton o forks) |
|
576 |
{name = "join_tasks", group = SOME (new_group NONE), |
|
577 |
deps = tasks, pri = 0, interrupts = false} I |
|
578 |
|> join; |
|
579 |
||
29366 | 580 |
|
54649
99b9249b3e05
more official task context via Task_Queue.enroll, which is required to participate in group cancellation (e.g. to terminate command exec);
wenzelm
parents:
54637
diff
changeset
|
581 |
(* task context for running thread *) |
99b9249b3e05
more official task context via Task_Queue.enroll, which is required to participate in group cancellation (e.g. to terminate command exec);
wenzelm
parents:
54637
diff
changeset
|
582 |
|
99b9249b3e05
more official task context via Task_Queue.enroll, which is required to participate in group cancellation (e.g. to terminate command exec);
wenzelm
parents:
54637
diff
changeset
|
583 |
fun task_context name group f x = |
99b9249b3e05
more official task context via Task_Queue.enroll, which is required to participate in group cancellation (e.g. to terminate command exec);
wenzelm
parents:
54637
diff
changeset
|
584 |
Multithreading.with_attributes Multithreading.no_interrupts (fn orig_atts => |
99b9249b3e05
more official task context via Task_Queue.enroll, which is required to participate in group cancellation (e.g. to terminate command exec);
wenzelm
parents:
54637
diff
changeset
|
585 |
let |
99b9249b3e05
more official task context via Task_Queue.enroll, which is required to participate in group cancellation (e.g. to terminate command exec);
wenzelm
parents:
54637
diff
changeset
|
586 |
val (result, job) = future_job group orig_atts (fn () => f x); |
99b9249b3e05
more official task context via Task_Queue.enroll, which is required to participate in group cancellation (e.g. to terminate command exec);
wenzelm
parents:
54637
diff
changeset
|
587 |
val task = |
99b9249b3e05
more official task context via Task_Queue.enroll, which is required to participate in group cancellation (e.g. to terminate command exec);
wenzelm
parents:
54637
diff
changeset
|
588 |
SYNCHRONIZED "enroll" (fn () => |
99b9249b3e05
more official task context via Task_Queue.enroll, which is required to participate in group cancellation (e.g. to terminate command exec);
wenzelm
parents:
54637
diff
changeset
|
589 |
Unsynchronized.change_result queue (Task_Queue.enroll (Thread.self ()) name group)); |
99b9249b3e05
more official task context via Task_Queue.enroll, which is required to participate in group cancellation (e.g. to terminate command exec);
wenzelm
parents:
54637
diff
changeset
|
590 |
val _ = worker_exec (task, [job]); |
99b9249b3e05
more official task context via Task_Queue.enroll, which is required to participate in group cancellation (e.g. to terminate command exec);
wenzelm
parents:
54637
diff
changeset
|
591 |
in |
99b9249b3e05
more official task context via Task_Queue.enroll, which is required to participate in group cancellation (e.g. to terminate command exec);
wenzelm
parents:
54637
diff
changeset
|
592 |
(case Single_Assignment.peek result of |
99b9249b3e05
more official task context via Task_Queue.enroll, which is required to participate in group cancellation (e.g. to terminate command exec);
wenzelm
parents:
54637
diff
changeset
|
593 |
NONE => raise Fail "Missing task context result" |
99b9249b3e05
more official task context via Task_Queue.enroll, which is required to participate in group cancellation (e.g. to terminate command exec);
wenzelm
parents:
54637
diff
changeset
|
594 |
| SOME res => Exn.release res) |
99b9249b3e05
more official task context via Task_Queue.enroll, which is required to participate in group cancellation (e.g. to terminate command exec);
wenzelm
parents:
54637
diff
changeset
|
595 |
end); |
99b9249b3e05
more official task context via Task_Queue.enroll, which is required to participate in group cancellation (e.g. to terminate command exec);
wenzelm
parents:
54637
diff
changeset
|
596 |
|
99b9249b3e05
more official task context via Task_Queue.enroll, which is required to participate in group cancellation (e.g. to terminate command exec);
wenzelm
parents:
54637
diff
changeset
|
597 |
|
51325
bcd6b1aa4db5
more uniform Future.map: always internalize failure;
wenzelm
parents:
51283
diff
changeset
|
598 |
(* fast-path operations -- bypass task queue if possible *) |
34277
7325a5e3587f
added Future.promise/fulfill -- promised futures that are fulfilled by external means;
wenzelm
parents:
33416
diff
changeset
|
599 |
|
44294
a0ddd5760444
clarified Future.cond_forks: more uniform handling of exceptional situations;
wenzelm
parents:
44268
diff
changeset
|
600 |
fun value_result (res: 'a Exn.result) = |
34277
7325a5e3587f
added Future.promise/fulfill -- promised futures that are fulfilled by external means;
wenzelm
parents:
33416
diff
changeset
|
601 |
let |
45136
2afb928c71ca
static dummy_task (again) to avoid a few extra allocations;
wenzelm
parents:
44427
diff
changeset
|
602 |
val task = Task_Queue.dummy_task; |
41683
73dde8006820
maintain Task_Queue.group within Task_Queue.task;
wenzelm
parents:
41681
diff
changeset
|
603 |
val group = Task_Queue.group_of_task task; |
35016 | 604 |
val result = Single_Assignment.var "value" : 'a result; |
50914
fe4714886d92
identify future results more carefully, to avoid odd duplication of error messages, notably from forked goals;
wenzelm
parents:
50911
diff
changeset
|
605 |
val _ = assign_result group result (identify_result (Position.thread_data ()) res); |
41683
73dde8006820
maintain Task_Queue.group within Task_Queue.task;
wenzelm
parents:
41681
diff
changeset
|
606 |
in Future {promised = false, task = task, result = result} end; |
29366 | 607 |
|
44294
a0ddd5760444
clarified Future.cond_forks: more uniform handling of exceptional situations;
wenzelm
parents:
44268
diff
changeset
|
608 |
fun value x = value_result (Exn.Res x); |
a0ddd5760444
clarified Future.cond_forks: more uniform handling of exceptional situations;
wenzelm
parents:
44268
diff
changeset
|
609 |
|
44330 | 610 |
fun cond_forks args es = |
611 |
if Multithreading.enabled () then forks args es |
|
612 |
else map (fn e => value_result (Exn.interruptible_capture e ())) es; |
|
613 |
||
29384
a3c7e9ae9b71
more robust propagation of errors through bulk jobs;
wenzelm
parents:
29366
diff
changeset
|
614 |
fun map_future f x = |
51325
bcd6b1aa4db5
more uniform Future.map: always internalize failure;
wenzelm
parents:
51283
diff
changeset
|
615 |
if is_finished x then value_result (Exn.interruptible_capture (f o join) x) |
49935
d1ecb3554b25
clarified Future.map (again): finished value is mapped in-place, which saves task structures and changes error behaviour slightly (tolerance against canceled group of old value etc.);
wenzelm
parents:
49910
diff
changeset
|
616 |
else |
d1ecb3554b25
clarified Future.map (again): finished value is mapped in-place, which saves task structures and changes error behaviour slightly (tolerance against canceled group of old value etc.);
wenzelm
parents:
49910
diff
changeset
|
617 |
let |
d1ecb3554b25
clarified Future.map (again): finished value is mapped in-place, which saves task structures and changes error behaviour slightly (tolerance against canceled group of old value etc.);
wenzelm
parents:
49910
diff
changeset
|
618 |
val task = task_of x; |
d1ecb3554b25
clarified Future.map (again): finished value is mapped in-place, which saves task structures and changes error behaviour slightly (tolerance against canceled group of old value etc.);
wenzelm
parents:
49910
diff
changeset
|
619 |
val group = Task_Queue.group_of_task task; |
54649
99b9249b3e05
more official task context via Task_Queue.enroll, which is required to participate in group cancellation (e.g. to terminate command exec);
wenzelm
parents:
54637
diff
changeset
|
620 |
val (result, job) = |
99b9249b3e05
more official task context via Task_Queue.enroll, which is required to participate in group cancellation (e.g. to terminate command exec);
wenzelm
parents:
54637
diff
changeset
|
621 |
future_job group Multithreading.private_interrupts (fn () => f (join x)); |
29384
a3c7e9ae9b71
more robust propagation of errors through bulk jobs;
wenzelm
parents:
29366
diff
changeset
|
622 |
|
49935
d1ecb3554b25
clarified Future.map (again): finished value is mapped in-place, which saves task structures and changes error behaviour slightly (tolerance against canceled group of old value etc.);
wenzelm
parents:
49910
diff
changeset
|
623 |
val extended = SYNCHRONIZED "extend" (fn () => |
d1ecb3554b25
clarified Future.map (again): finished value is mapped in-place, which saves task structures and changes error behaviour slightly (tolerance against canceled group of old value etc.);
wenzelm
parents:
49910
diff
changeset
|
624 |
(case Task_Queue.extend task job (! queue) of |
d1ecb3554b25
clarified Future.map (again): finished value is mapped in-place, which saves task structures and changes error behaviour slightly (tolerance against canceled group of old value etc.);
wenzelm
parents:
49910
diff
changeset
|
625 |
SOME queue' => (queue := queue'; true) |
d1ecb3554b25
clarified Future.map (again): finished value is mapped in-place, which saves task structures and changes error behaviour slightly (tolerance against canceled group of old value etc.);
wenzelm
parents:
49910
diff
changeset
|
626 |
| NONE => false)); |
d1ecb3554b25
clarified Future.map (again): finished value is mapped in-place, which saves task structures and changes error behaviour slightly (tolerance against canceled group of old value etc.);
wenzelm
parents:
49910
diff
changeset
|
627 |
in |
d1ecb3554b25
clarified Future.map (again): finished value is mapped in-place, which saves task structures and changes error behaviour slightly (tolerance against canceled group of old value etc.);
wenzelm
parents:
49910
diff
changeset
|
628 |
if extended then Future {promised = false, task = task, result = result} |
d1ecb3554b25
clarified Future.map (again): finished value is mapped in-place, which saves task structures and changes error behaviour slightly (tolerance against canceled group of old value etc.);
wenzelm
parents:
49910
diff
changeset
|
629 |
else |
d1ecb3554b25
clarified Future.map (again): finished value is mapped in-place, which saves task structures and changes error behaviour slightly (tolerance against canceled group of old value etc.);
wenzelm
parents:
49910
diff
changeset
|
630 |
(singleton o cond_forks) |
d1ecb3554b25
clarified Future.map (again): finished value is mapped in-place, which saves task structures and changes error behaviour slightly (tolerance against canceled group of old value etc.);
wenzelm
parents:
49910
diff
changeset
|
631 |
{name = "map_future", group = SOME group, deps = [task], |
d1ecb3554b25
clarified Future.map (again): finished value is mapped in-place, which saves task structures and changes error behaviour slightly (tolerance against canceled group of old value etc.);
wenzelm
parents:
49910
diff
changeset
|
632 |
pri = Task_Queue.pri_of_task task, interrupts = true} |
d1ecb3554b25
clarified Future.map (again): finished value is mapped in-place, which saves task structures and changes error behaviour slightly (tolerance against canceled group of old value etc.);
wenzelm
parents:
49910
diff
changeset
|
633 |
(fn () => f (join x)) |
d1ecb3554b25
clarified Future.map (again): finished value is mapped in-place, which saves task structures and changes error behaviour slightly (tolerance against canceled group of old value etc.);
wenzelm
parents:
49910
diff
changeset
|
634 |
end; |
28979
3ce619d8d432
fork/map: no inheritance of group (structure is nested, not parallel);
wenzelm
parents:
28972
diff
changeset
|
635 |
|
28191 | 636 |
|
34277
7325a5e3587f
added Future.promise/fulfill -- promised futures that are fulfilled by external means;
wenzelm
parents:
33416
diff
changeset
|
637 |
(* promised futures -- fulfilled by external means *) |
7325a5e3587f
added Future.promise/fulfill -- promised futures that are fulfilled by external means;
wenzelm
parents:
33416
diff
changeset
|
638 |
|
44298
b8f8488704e2
Future.promise: explicit abort operation (like uninterruptible future job);
wenzelm
parents:
44295
diff
changeset
|
639 |
fun promise_group group abort : 'a future = |
34277
7325a5e3587f
added Future.promise/fulfill -- promised futures that are fulfilled by external means;
wenzelm
parents:
33416
diff
changeset
|
640 |
let |
35016 | 641 |
val result = Single_Assignment.var "promise" : 'a result; |
44298
b8f8488704e2
Future.promise: explicit abort operation (like uninterruptible future job);
wenzelm
parents:
44295
diff
changeset
|
642 |
fun assign () = assign_result group result Exn.interrupt_exn |
39243
307e3d07d19f
Future.promise: more robust treatment of concurrent abort vs. fulfill (amending 047c96f41455);
wenzelm
parents:
39232
diff
changeset
|
643 |
handle Fail _ => true |
307e3d07d19f
Future.promise: more robust treatment of concurrent abort vs. fulfill (amending 047c96f41455);
wenzelm
parents:
39232
diff
changeset
|
644 |
| exn => |
44298
b8f8488704e2
Future.promise: explicit abort operation (like uninterruptible future job);
wenzelm
parents:
44295
diff
changeset
|
645 |
if Exn.is_interrupt exn |
b8f8488704e2
Future.promise: explicit abort operation (like uninterruptible future job);
wenzelm
parents:
44295
diff
changeset
|
646 |
then raise Fail "Concurrent attempt to fulfill promise" |
39243
307e3d07d19f
Future.promise: more robust treatment of concurrent abort vs. fulfill (amending 047c96f41455);
wenzelm
parents:
39232
diff
changeset
|
647 |
else reraise exn; |
44298
b8f8488704e2
Future.promise: explicit abort operation (like uninterruptible future job);
wenzelm
parents:
44295
diff
changeset
|
648 |
fun job () = |
b8f8488704e2
Future.promise: explicit abort operation (like uninterruptible future job);
wenzelm
parents:
44295
diff
changeset
|
649 |
Multithreading.with_attributes Multithreading.no_interrupts |
47423
8a179a0493e3
more robust Future.fulfill wrt. duplicate assignment and interrupt;
wenzelm
parents:
47421
diff
changeset
|
650 |
(fn _ => Exn.release (Exn.capture assign () before abort ())); |
37854
047c96f41455
back to more strict dependencies, even for canceled groups (reverting parts of 02936e77a07c);
wenzelm
parents:
37852
diff
changeset
|
651 |
val task = SYNCHRONIZED "enqueue_passive" (fn () => |
44298
b8f8488704e2
Future.promise: explicit abort operation (like uninterruptible future job);
wenzelm
parents:
44295
diff
changeset
|
652 |
Unsynchronized.change_result queue (Task_Queue.enqueue_passive group job)); |
41683
73dde8006820
maintain Task_Queue.group within Task_Queue.task;
wenzelm
parents:
41681
diff
changeset
|
653 |
in Future {promised = true, task = task, result = result} end; |
34277
7325a5e3587f
added Future.promise/fulfill -- promised futures that are fulfilled by external means;
wenzelm
parents:
33416
diff
changeset
|
654 |
|
44298
b8f8488704e2
Future.promise: explicit abort operation (like uninterruptible future job);
wenzelm
parents:
44295
diff
changeset
|
655 |
fun promise abort = promise_group (worker_subgroup ()) abort; |
34277
7325a5e3587f
added Future.promise/fulfill -- promised futures that are fulfilled by external means;
wenzelm
parents:
33416
diff
changeset
|
656 |
|
41683
73dde8006820
maintain Task_Queue.group within Task_Queue.task;
wenzelm
parents:
41681
diff
changeset
|
657 |
fun fulfill_result (Future {promised, task, result}) res = |
39243
307e3d07d19f
Future.promise: more robust treatment of concurrent abort vs. fulfill (amending 047c96f41455);
wenzelm
parents:
39232
diff
changeset
|
658 |
if not promised then raise Fail "Not a promised future" |
307e3d07d19f
Future.promise: more robust treatment of concurrent abort vs. fulfill (amending 047c96f41455);
wenzelm
parents:
39232
diff
changeset
|
659 |
else |
307e3d07d19f
Future.promise: more robust treatment of concurrent abort vs. fulfill (amending 047c96f41455);
wenzelm
parents:
39232
diff
changeset
|
660 |
let |
41683
73dde8006820
maintain Task_Queue.group within Task_Queue.task;
wenzelm
parents:
41681
diff
changeset
|
661 |
val group = Task_Queue.group_of_task task; |
50914
fe4714886d92
identify future results more carefully, to avoid odd duplication of error messages, notably from forked goals;
wenzelm
parents:
50911
diff
changeset
|
662 |
val pos = Position.thread_data (); |
fe4714886d92
identify future results more carefully, to avoid odd duplication of error messages, notably from forked goals;
wenzelm
parents:
50911
diff
changeset
|
663 |
fun job ok = |
fe4714886d92
identify future results more carefully, to avoid odd duplication of error messages, notably from forked goals;
wenzelm
parents:
50911
diff
changeset
|
664 |
assign_result group result (if ok then identify_result pos res else Exn.interrupt_exn); |
39243
307e3d07d19f
Future.promise: more robust treatment of concurrent abort vs. fulfill (amending 047c96f41455);
wenzelm
parents:
39232
diff
changeset
|
665 |
val _ = |
307e3d07d19f
Future.promise: more robust treatment of concurrent abort vs. fulfill (amending 047c96f41455);
wenzelm
parents:
39232
diff
changeset
|
666 |
Multithreading.with_attributes Multithreading.no_interrupts (fn _ => |
307e3d07d19f
Future.promise: more robust treatment of concurrent abort vs. fulfill (amending 047c96f41455);
wenzelm
parents:
39232
diff
changeset
|
667 |
let |
47423
8a179a0493e3
more robust Future.fulfill wrt. duplicate assignment and interrupt;
wenzelm
parents:
47421
diff
changeset
|
668 |
val passive_job = |
39243
307e3d07d19f
Future.promise: more robust treatment of concurrent abort vs. fulfill (amending 047c96f41455);
wenzelm
parents:
39232
diff
changeset
|
669 |
SYNCHRONIZED "fulfill_result" (fn () => |
307e3d07d19f
Future.promise: more robust treatment of concurrent abort vs. fulfill (amending 047c96f41455);
wenzelm
parents:
39232
diff
changeset
|
670 |
Unsynchronized.change_result queue |
307e3d07d19f
Future.promise: more robust treatment of concurrent abort vs. fulfill (amending 047c96f41455);
wenzelm
parents:
39232
diff
changeset
|
671 |
(Task_Queue.dequeue_passive (Thread.self ()) task)); |
47423
8a179a0493e3
more robust Future.fulfill wrt. duplicate assignment and interrupt;
wenzelm
parents:
47421
diff
changeset
|
672 |
in |
8a179a0493e3
more robust Future.fulfill wrt. duplicate assignment and interrupt;
wenzelm
parents:
47421
diff
changeset
|
673 |
(case passive_job of |
8a179a0493e3
more robust Future.fulfill wrt. duplicate assignment and interrupt;
wenzelm
parents:
47421
diff
changeset
|
674 |
SOME true => worker_exec (task, [job]) |
8a179a0493e3
more robust Future.fulfill wrt. duplicate assignment and interrupt;
wenzelm
parents:
47421
diff
changeset
|
675 |
| SOME false => () |
8a179a0493e3
more robust Future.fulfill wrt. duplicate assignment and interrupt;
wenzelm
parents:
47421
diff
changeset
|
676 |
| NONE => ignore (job (not (Task_Queue.is_canceled group)))) |
8a179a0493e3
more robust Future.fulfill wrt. duplicate assignment and interrupt;
wenzelm
parents:
47421
diff
changeset
|
677 |
end); |
41681
b5d7b15166bf
Future.join_results: discontinued post-hoc recording of dynamic dependencies;
wenzelm
parents:
41680
diff
changeset
|
678 |
val _ = |
41695
afdbec23b92b
eliminated slightly odd abstract type Task_Queue.deps;
wenzelm
parents:
41683
diff
changeset
|
679 |
if is_some (Single_Assignment.peek result) then () |
afdbec23b92b
eliminated slightly odd abstract type Task_Queue.deps;
wenzelm
parents:
41683
diff
changeset
|
680 |
else worker_waiting [task] (fn () => ignore (Single_Assignment.await result)); |
39243
307e3d07d19f
Future.promise: more robust treatment of concurrent abort vs. fulfill (amending 047c96f41455);
wenzelm
parents:
39232
diff
changeset
|
681 |
in () end; |
34277
7325a5e3587f
added Future.promise/fulfill -- promised futures that are fulfilled by external means;
wenzelm
parents:
33416
diff
changeset
|
682 |
|
43761
e72ba84ae58f
tuned signature -- corresponding to Scala version;
wenzelm
parents:
43665
diff
changeset
|
683 |
fun fulfill x res = fulfill_result x (Exn.Res res); |
34277
7325a5e3587f
added Future.promise/fulfill -- promised futures that are fulfilled by external means;
wenzelm
parents:
33416
diff
changeset
|
684 |
|
7325a5e3587f
added Future.promise/fulfill -- promised futures that are fulfilled by external means;
wenzelm
parents:
33416
diff
changeset
|
685 |
|
54369 | 686 |
(* group snapshot *) |
687 |
||
688 |
fun group_snapshot group = |
|
689 |
SYNCHRONIZED "group_snapshot" (fn () => |
|
690 |
Task_Queue.group_tasks (! queue) group); |
|
691 |
||
692 |
||
49906 | 693 |
(* terminate *) |
694 |
||
695 |
fun terminate group = |
|
54369 | 696 |
SYNCHRONIZED "terminate" (fn () => |
697 |
let val _ = cancel_group_unsynchronized group; |
|
698 |
in Task_Queue.group_tasks (! queue) group end) |
|
699 |
|> join_tasks; |
|
49906 | 700 |
|
701 |
||
32228
7622c03141b0
scheduler: shutdown spontaneously (after some delay) if queue is empty;
wenzelm
parents:
32227
diff
changeset
|
702 |
(* shutdown *) |
29366 | 703 |
|
28203 | 704 |
fun shutdown () = |
51283
fefd07697979
disallow shutdown from worker, which would lead to deadlock since the scheduler cannot terminate;
wenzelm
parents:
51281
diff
changeset
|
705 |
if not Multithreading.available then () |
fefd07697979
disallow shutdown from worker, which would lead to deadlock since the scheduler cannot terminate;
wenzelm
parents:
51281
diff
changeset
|
706 |
else if is_some (worker_task ()) then |
fefd07697979
disallow shutdown from worker, which would lead to deadlock since the scheduler cannot terminate;
wenzelm
parents:
51281
diff
changeset
|
707 |
raise Fail "Cannot shutdown while running as worker thread" |
fefd07697979
disallow shutdown from worker, which would lead to deadlock since the scheduler cannot terminate;
wenzelm
parents:
51281
diff
changeset
|
708 |
else |
28276 | 709 |
SYNCHRONIZED "shutdown" (fn () => |
51279 | 710 |
while scheduler_active () do |
711 |
(Multithreading.tracing 1 (fn () => "SHUTDOWN: wait"); |
|
51283
fefd07697979
disallow shutdown from worker, which would lead to deadlock since the scheduler cannot terminate;
wenzelm
parents:
51281
diff
changeset
|
712 |
wait scheduler_event)); |
28203 | 713 |
|
29366 | 714 |
|
715 |
(*final declarations of this structure!*) |
|
716 |
val map = map_future; |
|
717 |
||
28156 | 718 |
end; |
28972 | 719 |
|
720 |
type 'a future = 'a Future.future; |
|
721 |