author | bulwahn |
Fri, 03 Dec 2010 08:40:47 +0100 | |
changeset 40905 | 647142607448 |
parent 40301 | bf39a257b3d3 |
permissions | -rw-r--r-- |
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(* Title: HOL/Tools/async_manager.ML |
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Author: Fabian Immler, TU Muenchen |
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Author: Makarius |
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Author: Jasmin Blanchette, TU Muenchen |
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Central manager for asynchronous diagnosis tool threads. |
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*) |
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signature ASYNC_MANAGER = |
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sig |
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val break_into_chunks : string list -> string list |
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val launch : |
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string -> Time.time -> Time.time -> string -> (unit -> string) -> unit |
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val kill_threads : string -> string -> unit |
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val running_threads : string -> string -> unit |
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val thread_messages : string -> string -> int option -> unit |
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end; |
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structure Async_Manager : ASYNC_MANAGER = |
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struct |
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(** preferences **) |
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val message_store_limit = 20; |
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val message_display_limit = 5; |
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(** thread management **) |
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(* data structures over threads *) |
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structure Thread_Heap = Heap |
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( |
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type elem = Time.time * Thread.thread; |
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fun ord ((a, _), (b, _)) = Time.compare (a, b); |
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); |
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fun lookup_thread xs = AList.lookup Thread.equal xs; |
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fun delete_thread xs = AList.delete Thread.equal xs; |
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fun update_thread xs = AList.update Thread.equal xs; |
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(* state of thread manager *) |
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type state = |
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{manager: Thread.thread option, |
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timeout_heap: Thread_Heap.T, |
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active: (Thread.thread * (string * Time.time * Time.time * string)) list, |
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canceling: (Thread.thread * (string * Time.time * string)) list, |
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messages: (string * string) list, |
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store: (string * string) list} |
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fun make_state manager timeout_heap active canceling messages store : state = |
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{manager = manager, timeout_heap = timeout_heap, active = active, |
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canceling = canceling, messages = messages, store = store} |
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val global_state = Synchronized.var "async_manager" |
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(make_state NONE Thread_Heap.empty [] [] [] []); |
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(* unregister thread *) |
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fun unregister message thread = |
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Synchronized.change global_state |
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(fn state as {manager, timeout_heap, active, canceling, messages, store} => |
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(case lookup_thread active thread of |
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SOME (tool, _, _, desc) => |
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let |
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val active' = delete_thread thread active; |
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val now = Time.now () |
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val canceling' = (thread, (tool, now, desc)) :: canceling |
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val message' = desc ^ "\n" ^ message |
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val messages' = (tool, message') :: messages; |
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val store' = (tool, message') :: |
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(if length store <= message_store_limit then store |
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else #1 (chop message_store_limit store)); |
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in make_state manager timeout_heap active' canceling' messages' store' end |
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| NONE => state)); |
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(* main manager thread -- only one may exist *) |
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val min_wait_time = seconds 0.3; |
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val max_wait_time = seconds 10.0; |
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fun replace_all bef aft = |
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let |
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fun aux seen "" = String.implode (rev seen) |
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| aux seen s = |
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if String.isPrefix bef s then |
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aux seen "" ^ aft ^ aux [] (unprefix bef s) |
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else |
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aux (String.sub (s, 0) :: seen) (String.extract (s, 1, NONE)) |
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in aux [] end |
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(* This is a workaround for Proof General's off-by-a-few sendback display bug, |
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whereby "pr" in "proof" is not highlighted. *) |
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val break_into_chunks = maps (space_explode "\000" o replace_all "\n\n" "\000") |
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fun print_new_messages () = |
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case Synchronized.change_result global_state |
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(fn {manager, timeout_heap, active, canceling, messages, store} => |
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(messages, make_state manager timeout_heap active canceling [] |
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store)) of |
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[] => () |
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| msgs as (tool, _) :: _ => |
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let val ss = break_into_chunks (map snd msgs) in |
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List.app Output.urgent_message (tool ^ ": " ^ hd ss :: tl ss) |
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end |
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fun check_thread_manager () = Synchronized.change global_state |
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(fn state as {manager, timeout_heap, active, canceling, messages, store} => |
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if (case manager of SOME thread => Thread.isActive thread | NONE => false) then state |
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else let val manager = SOME (Toplevel.thread false (fn () => |
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let |
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fun time_limit timeout_heap = |
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(case try Thread_Heap.min timeout_heap of |
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NONE => Time.+ (Time.now (), max_wait_time) |
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| SOME (time, _) => time); |
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(*action: find threads whose timeout is reached, and interrupt canceling threads*) |
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fun action {manager, timeout_heap, active, canceling, messages, store} = |
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let val (timeout_threads, timeout_heap') = |
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Thread_Heap.upto (Time.now (), Thread.self ()) timeout_heap; |
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in |
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if null timeout_threads andalso null canceling then |
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NONE |
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128 |
else |
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129 |
let |
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val _ = List.app (Simple_Thread.interrupt o #1) canceling |
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val canceling' = filter (Thread.isActive o #1) canceling |
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val state' = make_state manager timeout_heap' active canceling' messages store; |
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in SOME (map #2 timeout_threads, state') end |
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134 |
end; |
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135 |
in |
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136 |
while Synchronized.change_result global_state |
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137 |
(fn state as {timeout_heap, active, canceling, messages, store, ...} => |
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138 |
if null active andalso null canceling andalso null messages |
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139 |
then (false, make_state NONE timeout_heap active canceling messages store) |
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140 |
else (true, state)) |
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|
141 |
do |
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|
142 |
(Synchronized.timed_access global_state (SOME o time_limit o #timeout_heap) action |
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143 |
|> these |
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|> List.app (unregister "Timed out.\n"); |
37585 | 145 |
print_new_messages (); |
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146 |
(*give threads some time to respond to interrupt*) |
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147 |
OS.Process.sleep min_wait_time) |
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148 |
end)) |
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149 |
in make_state manager timeout_heap active canceling messages store end) |
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150 |
|
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|
151 |
|
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152 |
(* register thread *) |
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153 |
|
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154 |
fun register tool birth_time death_time desc thread = |
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(Synchronized.change global_state |
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|
156 |
(fn {manager, timeout_heap, active, canceling, messages, store} => |
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157 |
let |
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|
158 |
val timeout_heap' = Thread_Heap.insert (death_time, thread) timeout_heap; |
37585 | 159 |
val active' = update_thread (thread, (tool, birth_time, death_time, desc)) active; |
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160 |
val state' = make_state manager timeout_heap' active' canceling messages store; |
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161 |
in state' end); |
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162 |
check_thread_manager ()) |
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163 |
|
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|
164 |
|
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|
165 |
fun launch tool birth_time death_time desc f = |
37584 | 166 |
(Toplevel.thread true |
167 |
(fn () => |
|
168 |
let |
|
169 |
val self = Thread.self () |
|
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170 |
val _ = register tool birth_time death_time desc self |
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val message = f () |
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172 |
in unregister message self end); |
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()) |
174 |
||
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175 |
|
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176 |
(** user commands **) |
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|
177 |
|
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178 |
(* kill threads *) |
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179 |
|
37585 | 180 |
fun kill_threads tool workers = Synchronized.change global_state |
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181 |
(fn {manager, timeout_heap, active, canceling, messages, store} => |
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|
182 |
let |
37585 | 183 |
val killing = |
184 |
map_filter (fn (th, (tool', _, _, desc)) => |
|
185 |
if tool' = tool then SOME (th, (tool', Time.now (), desc)) |
|
186 |
else NONE) active |
|
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187 |
val state' = make_state manager timeout_heap [] (killing @ canceling) messages store; |
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188 |
val _ = if null killing then () else Output.urgent_message ("Killed active " ^ workers ^ ".") |
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|
189 |
in state' end); |
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|
190 |
|
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|
191 |
|
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192 |
(* running threads *) |
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|
193 |
|
37585 | 194 |
fun seconds time = string_of_int (Time.toSeconds time) ^ " s" |
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195 |
|
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fun running_threads tool workers = |
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197 |
let |
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|
198 |
val {active, canceling, ...} = Synchronized.value global_state; |
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|
199 |
|
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|
200 |
val now = Time.now (); |
37585 | 201 |
fun running_info (_, (tool', birth_time, death_time, desc)) = |
202 |
if tool' = tool then |
|
203 |
SOME ("Running: " ^ seconds (Time.- (now, birth_time)) ^ " -- " ^ |
|
204 |
seconds (Time.- (death_time, now)) ^ " to live:\n" ^ desc) |
|
205 |
else |
|
206 |
NONE |
|
207 |
fun canceling_info (_, (tool', death_time, desc)) = |
|
208 |
if tool' = tool then |
|
209 |
SOME ("Trying to interrupt thread since " ^ |
|
210 |
seconds (Time.- (now, death_time)) ^ ":\n" ^ desc) |
|
211 |
else |
|
212 |
NONE |
|
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|
213 |
val running = |
37585 | 214 |
case map_filter running_info active of |
215 |
[] => ["No " ^ workers ^ " running."] |
|
216 |
| ss => "Running " ^ workers ^ ":" :: ss |
|
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|
217 |
val interrupting = |
37585 | 218 |
case map_filter canceling_info canceling of |
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219 |
[] => [] |
37585 | 220 |
| ss => "Trying to interrupt the following " ^ workers ^ ":" :: ss |
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221 |
in Output.urgent_message (space_implode "\n\n" (running @ interrupting)) end |
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222 |
|
37585 | 223 |
fun thread_messages tool worker opt_limit = |
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|
224 |
let |
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|
225 |
val limit = the_default message_display_limit opt_limit; |
37585 | 226 |
val tool_store = Synchronized.value global_state |
227 |
|> #store |> filter (curry (op =) tool o fst) |
|
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|
228 |
val header = |
37585 | 229 |
"Recent " ^ worker ^ " messages" ^ |
230 |
(if length tool_store <= limit then ":" |
|
231 |
else " (" ^ string_of_int limit ^ " displayed):"); |
|
39369 | 232 |
in |
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|
233 |
List.app Output.urgent_message (header :: break_into_chunks |
39369 | 234 |
(map snd (#1 (chop limit tool_store)))) |
235 |
end |
|
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|
236 |
|
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|
237 |
end; |