src/Pure/ML-Systems/multithreading.ML
author wenzelm
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(*  Title:      Pure/ML-Systems/multithreading.ML
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    Author:     Makarius
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Dummy implementation of multithreading setup.
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*)
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signature BASIC_MULTITHREADING =
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sig
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  val NAMED_CRITICAL: string -> (unit -> 'a) -> 'a
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  val CRITICAL: (unit -> 'a) -> 'a
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end;
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signature MULTITHREADING =
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sig
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  include BASIC_MULTITHREADING
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  val trace: int ref
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  val tracing: int -> (unit -> string) -> unit
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  val available: bool
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  val max_threads: int ref
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  val max_threads_value: unit -> int
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  val enabled: unit -> bool
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  val no_interrupts: Thread.threadAttribute list
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  val regular_interrupts: Thread.threadAttribute list
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  val with_attributes: Thread.threadAttribute list ->
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    (Thread.threadAttribute list -> 'a -> 'b) -> 'a -> 'b
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  val self_critical: unit -> bool
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  val serial: unit -> int
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end;
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structure Multithreading: MULTITHREADING =
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struct
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(* options *)
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val trace = ref (0: int);
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fun tracing _ _ = ();
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val available = false;
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val max_threads = ref (1: int);
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fun max_threads_value () = 1: int;
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fun enabled () = false;
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val no_interrupts =
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  [Thread.EnableBroadcastInterrupt false, Thread.InterruptState Thread.InterruptDefer];
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val regular_interrupts =
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  [Thread.EnableBroadcastInterrupt true, Thread.InterruptState Thread.InterruptAsynchOnce];
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fun with_attributes _ f x = f [] x;
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(* critical section *)
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fun self_critical () = false;
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fun NAMED_CRITICAL _ e = e ();
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fun CRITICAL e = e ();
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(* serial numbers *)
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local val count = ref (0: int)
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in fun serial () = (count := ! count + 1; ! count) end;
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end;
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structure BasicMultithreading: BASIC_MULTITHREADING = Multithreading;
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open BasicMultithreading;