src/Pure/RAW/multithreading.ML

--- a/src/Pure/RAW/multithreading.ML	Thu Mar 03 17:03:09 2016 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,191 +0,0 @@
-(*  Title:      Pure/RAW/multithreading.ML
-    Author:     Makarius
-
-Multithreading in Poly/ML (cf. polyml/basis/Thread.sml).
-*)
-
-signature BASIC_MULTITHREADING =
-sig
-  val interruptible: ('a -> 'b) -> 'a -> 'b
-  val uninterruptible: ((('c -> 'd) -> 'c -> 'd) -> 'a -> 'b) -> 'a -> 'b
-end;
-
-signature MULTITHREADING =
-sig
-  include BASIC_MULTITHREADING
-  val no_interrupts: Thread.threadAttribute list
-  val public_interrupts: Thread.threadAttribute list
-  val private_interrupts: Thread.threadAttribute list
-  val sync_interrupts: Thread.threadAttribute list -> Thread.threadAttribute list
-  val interrupted: unit -> unit  (*exception Interrupt*)
-  val with_attributes: Thread.threadAttribute list -> (Thread.threadAttribute list -> 'a) -> 'a
-  val max_threads_value: unit -> int
-  val max_threads_update: int -> unit
-  val max_threads_setmp: int -> ('a -> 'b) -> 'a -> 'b
-  val enabled: unit -> bool
-  val sync_wait: Thread.threadAttribute list option -> Time.time option ->
-    ConditionVar.conditionVar -> Mutex.mutex -> bool Exn.result
-  val trace: int ref
-  val tracing: int -> (unit -> string) -> unit
-  val tracing_time: bool -> Time.time -> (unit -> string) -> unit
-  val real_time: ('a -> unit) -> 'a -> Time.time
-  val synchronized: string -> Mutex.mutex -> (unit -> 'a) -> 'a
-  val serial: unit -> int
-end;
-
-structure Multithreading: MULTITHREADING =
-struct
-
-(* thread attributes *)
-
-val no_interrupts =
-  [Thread.EnableBroadcastInterrupt false, Thread.InterruptState Thread.InterruptDefer];
-
-val test_interrupts =
-  [Thread.EnableBroadcastInterrupt false, Thread.InterruptState Thread.InterruptSynch];
-
-val public_interrupts =
-  [Thread.EnableBroadcastInterrupt true, Thread.InterruptState Thread.InterruptAsynchOnce];
-
-val private_interrupts =
-  [Thread.EnableBroadcastInterrupt false, Thread.InterruptState Thread.InterruptAsynchOnce];
-
-val sync_interrupts = map
-  (fn x as Thread.InterruptState Thread.InterruptDefer => x
-    | Thread.InterruptState _ => Thread.InterruptState Thread.InterruptSynch
-    | x => x);
-
-val safe_interrupts = map
-  (fn Thread.InterruptState Thread.InterruptAsynch =>
-      Thread.InterruptState Thread.InterruptAsynchOnce
-    | x => x);
-
-fun interrupted () =
-  let
-    val orig_atts = safe_interrupts (Thread.getAttributes ());
-    val _ = Thread.setAttributes test_interrupts;
-    val test = Exn.capture Thread.testInterrupt ();
-    val _ = Thread.setAttributes orig_atts;
-  in Exn.release test end;
-
-fun with_attributes new_atts e =
-  let
-    val orig_atts = safe_interrupts (Thread.getAttributes ());
-    val result = Exn.capture (fn () =>
-      (Thread.setAttributes (safe_interrupts new_atts); e orig_atts)) ();
-    val _ = Thread.setAttributes orig_atts;
-  in Exn.release result end;
-
-
-(* portable wrappers *)
-
-fun interruptible f x = with_attributes public_interrupts (fn _ => f x);
-
-fun uninterruptible f x =
-  with_attributes no_interrupts (fn atts =>
-    f (fn g => fn y => with_attributes atts (fn _ => g y)) x);
-
-
-(* options *)
-
-fun max_threads_result m =
-  if m > 0 then m else Int.min (Int.max (Thread.numProcessors (), 1), 8);
-
-val max_threads = ref 1;
-
-fun max_threads_value () = ! max_threads;
-
-fun max_threads_update m = max_threads := max_threads_result m;
-
-fun max_threads_setmp m f x =
-  uninterruptible (fn restore_attributes => fn () =>
-    let
-      val max_threads_orig = ! max_threads;
-      val _ = max_threads_update m;
-      val result = Exn.capture (restore_attributes f) x;
-      val _ = max_threads := max_threads_orig;
-    in Exn.release result end) ();
-
-fun enabled () = max_threads_value () > 1;
-
-
-(* synchronous wait *)
-
-fun sync_wait opt_atts time cond lock =
-  with_attributes
-    (sync_interrupts (case opt_atts of SOME atts => atts | NONE => Thread.getAttributes ()))
-    (fn _ =>
-      (case time of
-        SOME t => Exn.Res (ConditionVar.waitUntil (cond, lock, t))
-      | NONE => (ConditionVar.wait (cond, lock); Exn.Res true))
-      handle exn => Exn.Exn exn);
-
-
-(* tracing *)
-
-val trace = ref 0;
-
-fun tracing level msg =
-  if level > ! trace then ()
-  else uninterruptible (fn _ => fn () =>
-    (TextIO.output (TextIO.stdErr, (">>> " ^ msg () ^ "\n")); TextIO.flushOut TextIO.stdErr)
-      handle _ (*sic*) => ()) ();
-
-fun tracing_time detailed time =
-  tracing
-   (if not detailed then 5
-    else if Time.>= (time, seconds 1.0) then 1
-    else if Time.>= (time, seconds 0.1) then 2
-    else if Time.>= (time, seconds 0.01) then 3
-    else if Time.>= (time, seconds 0.001) then 4 else 5);
-
-fun real_time f x =
-  let
-    val timer = Timer.startRealTimer ();
-    val () = f x;
-    val time = Timer.checkRealTimer timer;
-  in time end;
-
-
-(* synchronized evaluation *)
-
-fun synchronized name lock e =
-  Exn.release (uninterruptible (fn restore_attributes => fn () =>
-    let
-      val immediate =
-        if Mutex.trylock lock then true
-        else
-          let
-            val _ = tracing 5 (fn () => name ^ ": locking ...");
-            val time = real_time Mutex.lock lock;
-            val _ = tracing_time true time (fn () => name ^ ": locked after " ^ Time.toString time);
-          in false end;
-      val result = Exn.capture (restore_attributes e) ();
-      val _ = if immediate then () else tracing 5 (fn () => name ^ ": unlocking ...");
-      val _ = Mutex.unlock lock;
-    in result end) ());
-
-
-(* serial numbers *)
-
-local
-
-val serial_lock = Mutex.mutex ();
-val serial_count = ref 0;
-
-in
-
-val serial = uninterruptible (fn _ => fn () =>
-  let
-    val _ = Mutex.lock serial_lock;
-    val _ = serial_count := ! serial_count + 1;
-    val res = ! serial_count;
-    val _ = Mutex.unlock serial_lock;
-  in res end);
-
-end;
-
-end;
-
-structure Basic_Multithreading: BASIC_MULTITHREADING = Multithreading;
-open Basic_Multithreading;