(* Title: HOL/Tools/Sledgehammer/async_manager.ML
Author: Fabian Immler, TU Muenchen
Author: Makarius
Author: Jasmin Blanchette, TU Muenchen
Central manager for asynchronous diagnosis tool threads.
Proof General legacy!
*)
signature ASYNC_MANAGER =
sig
val break_into_chunks : string -> string list
val thread : string -> Time.time -> Time.time -> string * string -> (unit -> bool * string) ->
unit
val kill_threads : string -> string -> unit
val has_running_threads : string -> bool
val running_threads : string -> string -> unit
val thread_messages : string -> string -> int option -> unit
end;
structure Async_Manager : ASYNC_MANAGER =
struct
fun make_thread interrupts body =
Thread.fork
(fn () =>
Runtime.debugging NONE body () handle exn =>
if Exn.is_interrupt exn then ()
else writeln ("## INTERNAL ERROR ##\n" ^ Runtime.exn_message exn),
Simple_Thread.attributes interrupts);
val message_store_limit = 20
val message_display_limit = 10
fun implode_message (workers, work) =
space_implode " " (Try.serial_commas "and" workers) ^ work
structure Thread_Heap = Heap
(
type elem = Time.time * Thread.thread
fun ord ((a, _), (b, _)) = Time.compare (a, b)
)
fun lookup_thread xs = AList.lookup Thread.equal xs
fun delete_thread xs = AList.delete Thread.equal xs
fun update_thread xs = AList.update Thread.equal xs
type state =
{manager: Thread.thread option,
timeout_heap: Thread_Heap.T,
active:
(Thread.thread
* (string * Time.time * Time.time * (string * string))) list,
canceling: (Thread.thread * (string * Time.time * (string * string))) list,
messages: (bool * (string * (string * string))) list,
store: (string * (string * string)) list}
fun make_state manager timeout_heap active canceling messages store : state =
{manager = manager, timeout_heap = timeout_heap, active = active,
canceling = canceling, messages = messages, store = store}
val global_state = Synchronized.var "async_manager" (make_state NONE Thread_Heap.empty [] [] [] [])
fun unregister (urgent, message) thread =
Synchronized.change global_state
(fn state as {manager, timeout_heap, active, canceling, messages, store} =>
(case lookup_thread active thread of
SOME (tool, _, _, desc as (worker, its_desc)) =>
let
val active' = delete_thread thread active
val now = Time.now ()
val canceling' = (thread, (tool, now, desc)) :: canceling
val message' =
(worker, its_desc ^ (if message = "" then "" else "\n" ^ message))
val messages' = (urgent, (tool, message')) :: messages
val store' = (tool, message') ::
(if length store <= message_store_limit then store
else #1 (chop message_store_limit store))
in make_state manager timeout_heap active' canceling' messages' store' end
| NONE => state))
val min_wait_time = seconds 0.3
val max_wait_time = seconds 10.0
fun replace_all bef aft =
let
fun aux seen "" = String.implode (rev seen)
| aux seen s =
if String.isPrefix bef s then
aux seen "" ^ aft ^ aux [] (unprefix bef s)
else
aux (String.sub (s, 0) :: seen) (String.extract (s, 1, NONE))
in aux [] end
(* This is a workaround for Proof General's off-by-a-few sendback display bug, whereby "pr" in
"proof" is not highlighted. *)
val break_into_chunks = space_explode "\000" o replace_all "\n\n" "\000"
fun print_new_messages () =
Synchronized.change_result global_state
(fn {manager, timeout_heap, active, canceling, messages, store} =>
messages
|> List.partition
(fn (urgent, _) =>
(null active andalso null canceling) orelse urgent)
||> (fn postponed_messages =>
make_state manager timeout_heap active canceling
postponed_messages store))
|> map (fn (_, (tool, (worker, work))) => ((tool, work), worker))
|> AList.group (op =)
|> List.app (fn ((_, ""), _) => ()
| ((tool, work), workers) =>
tool ^ ": " ^
implode_message (workers |> sort_distinct string_ord, work)
|> break_into_chunks
|> List.app writeln)
fun check_thread_manager () = Synchronized.change global_state
(fn state as {manager, timeout_heap, active, canceling, messages, store} =>
if (case manager of SOME thread => Thread.isActive thread | NONE => false) then state
else let val manager = SOME (make_thread false (fn () =>
let
fun time_limit timeout_heap =
(case try Thread_Heap.min timeout_heap of
NONE => Time.+ (Time.now (), max_wait_time)
| SOME (time, _) => time)
(*action: find threads whose timeout is reached, and interrupt canceling threads*)
fun action {manager, timeout_heap, active, canceling, messages, store} =
let val (timeout_threads, timeout_heap') =
Thread_Heap.upto (Time.now (), Thread.self ()) timeout_heap
in
if null timeout_threads andalso null canceling then
NONE
else
let
val _ = List.app (Simple_Thread.interrupt_unsynchronized o #1) canceling
val canceling' = filter (Thread.isActive o #1) canceling
val state' = make_state manager timeout_heap' active canceling' messages store
in SOME (map #2 timeout_threads, state') end
end
in
while Synchronized.change_result global_state
(fn state as {timeout_heap, active, canceling, messages, store, ...} =>
if null active andalso null canceling andalso null messages
then (false, make_state NONE timeout_heap active canceling messages store)
else (true, state))
do
(Synchronized.timed_access global_state
(SOME o time_limit o #timeout_heap) action
|> these
|> List.app (unregister (false, "Timed out."));
print_new_messages ();
(* give threads some time to respond to interrupt *)
OS.Process.sleep min_wait_time)
end))
in make_state manager timeout_heap active canceling messages store end)
fun register tool birth_time death_time desc thread =
(Synchronized.change global_state
(fn {manager, timeout_heap, active, canceling, messages, store} =>
let
val timeout_heap' = Thread_Heap.insert (death_time, thread) timeout_heap
val active' = update_thread (thread, (tool, birth_time, death_time, desc)) active
val state' = make_state manager timeout_heap' active' canceling messages store
in state' end);
check_thread_manager ())
fun thread tool birth_time death_time desc f =
(make_thread true
(fn () =>
let
val self = Thread.self ()
val _ = register tool birth_time death_time desc self
in unregister (f ()) self end);
())
fun kill_threads tool das_wort_worker = Synchronized.change global_state
(fn {manager, timeout_heap, active, canceling, messages, store} =>
let
val killing =
map_filter (fn (th, (tool', _, _, desc)) =>
if tool' = tool then SOME (th, (tool', Time.now (), desc))
else NONE) active
val state' = make_state manager timeout_heap [] (killing @ canceling) messages store
val _ =
if null killing then ()
else writeln ("Interrupted active " ^ das_wort_worker ^ "s.")
in state' end)
fun str_of_time time = string_of_int (Time.toSeconds time) ^ " s"
fun has_running_threads tool =
exists (fn (_, (tool', _, _, _)) => tool' = tool) (#active (Synchronized.value global_state))
fun running_threads tool das_wort_worker =
let
val {active, canceling, ...} = Synchronized.value global_state
val now = Time.now ()
fun running_info (_, (tool', birth_time, death_time, desc)) =
if tool' = tool then
SOME ("Running: " ^ str_of_time (Time.- (now, birth_time)) ^ " -- " ^
str_of_time (Time.- (death_time, now)) ^ " to live:\n" ^ op ^ desc)
else
NONE
fun canceling_info (_, (tool', death_time, desc)) =
if tool' = tool then
SOME ("Trying to interrupt " ^ das_wort_worker ^ " since " ^
str_of_time (Time.- (now, death_time)) ^ ":\n" ^ op ^ desc)
else
NONE
val running =
case map_filter running_info active of
[] => ["No " ^ das_wort_worker ^ "s running."]
| ss => "Running " ^ das_wort_worker ^ "s" :: ss
val interrupting =
case map_filter canceling_info canceling of
[] => []
| ss => "Interrupting " ^ das_wort_worker ^ "s" :: ss
in writeln (space_implode "\n\n" (running @ interrupting)) end
fun thread_messages tool das_wort_worker opt_limit =
let
val limit = the_default message_display_limit opt_limit
val tool_store = Synchronized.value global_state
|> #store |> filter (curry (op =) tool o fst)
val header =
"Recent " ^ das_wort_worker ^ " messages" ^
(if length tool_store <= limit then ":"
else " (" ^ string_of_int limit ^ " displayed):")
val ss = tool_store |> chop limit |> #1 |> map (op ^ o snd)
in List.app writeln (header :: maps break_into_chunks ss) end
end;