added no_interrupts;
moved dummy thread structures to dummy_thread.ML;

--- a/src/Pure/ML-Systems/multithreading.ML	Sun Sep 07 17:46:39 2008 +0200
+++ b/src/Pure/ML-Systems/multithreading.ML	Sun Sep 07 17:46:40 2008 +0200
@@ -2,7 +2,7 @@
     ID:         $Id$
     Author:     Makarius
 
-Default implementation of multithreading interface -- mostly dummies.
+Dummy implementation of multithreading setup.
 *)
 
 signature BASIC_MULTITHREADING =
@@ -19,6 +19,7 @@
   val available: bool
   val max_threads: int ref
   val max_threads_value: unit -> int
+  val no_interrupts: Thread.threadAttribute list
   val self_critical: unit -> bool
   val serial: unit -> int
 end;
@@ -35,6 +36,8 @@
 val max_threads = ref (1: int);
 fun max_threads_value () = Int.max (! max_threads, 1);
 
+val no_interrupts = [];
+
 
 (* critical section *)
 
@@ -53,80 +56,3 @@
 structure BasicMultithreading: BASIC_MULTITHREADING = Multithreading;
 open BasicMultithreading;
 
-
-
-(** dummy thread structures (cf. polyml/basis/Thread.sml) **)
-
-exception Thread of string;
-
-local fun fail _ = raise Thread "No multithreading support on this ML platform" in
-
-structure Mutex =
-struct
-  type mutex = unit;
-  fun mutex _ = fail ();
-  fun lock _ = fail ();
-  fun unlock _ = fail ();
-  fun trylock _ = fail ();
-end;
-
-structure ConditionVar =
-struct
-  type conditionVar = unit;
-  fun conditionVar _ = fail ();
-  fun wait _ = fail ();
-  fun waitUntil _ = fail ();
-  fun signal _ = fail ();
-  fun broadcast _ = fail ();
-end;
-
-structure Thread =
-struct
-  type thread = unit;
-
-  datatype threadAttribute = EnableBroadcastInterrupt of bool | InterruptState of interruptState
-    and interruptState = InterruptDefer | InterruptSynch | InterruptAsynch | InterruptAsynchOnce;
-
-  fun fork _ = fail ();
-  fun exit _ = fail ();
-  fun isActive _ = fail ();
-
-  fun equal _ = fail ();
-  fun self _ = fail ();
-
-  fun interrupt _ = fail ();
-  fun broadcastInterrupt _ = fail ();
-  fun testInterrupt _ = fail ();
-
-  fun kill _ = fail ();
-
-  fun setAttributes _ = fail ();
-  fun getAttributes _ = fail ();
-
-  fun numProcessors _ = fail ();
-
-
-(* thread data *)
-
-local
-
-val data = ref ([]: Universal.universal ref list);
-
-fun find_data tag =
-  let
-    fun find (r :: rs) = if Universal.tagIs tag (! r) then SOME r else find rs
-      | find [] = NONE;
-  in find (! data) end;
-
-in
-
-fun getLocal tag = Option.map (Universal.tagProject tag o !) (find_data tag);
-
-fun setLocal (tag, x) =
-  (case find_data tag of
-    SOME r => r := Universal.tagInject tag x
-  | NONE => data := ref (Universal.tagInject tag x) :: ! data);
-
-end;
-end;
-end;