src/Pure/System/isabelle_process.ML
author wenzelm
Wed, 30 Dec 2009 22:56:46 +0100
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simplified init message -- removed redundant session property;
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(*  Title:      Pure/System/isabelle_process.ML
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    Author:     Makarius
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Isabelle process wrapper.
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General format of process output:
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  (1) message = "\002"  header chunk  body chunk
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  (2) chunk = size (ASCII digits)  \n  content (YXML)
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*)
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signature ISABELLE_PROCESS =
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sig
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  val isabelle_processN: string
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  val init: string -> unit
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end;
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structure Isabelle_Process: ISABELLE_PROCESS =
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struct
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(* print modes *)
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val isabelle_processN = "isabelle_process";
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val _ = Output.add_mode isabelle_processN Output.default_output Output.default_escape;
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val _ = Markup.add_mode isabelle_processN YXML.output_markup;
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(* message markup *)
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local
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fun chunk s = string_of_int (size s) ^ "\n" ^ s;
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fun message _ _ _ "" = ()
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  | message out_stream ch props body =
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      let
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        val header = YXML.string_of (XML.Elem (ch, map (pairself YXML.binary_text) props, []));
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        val msg = Symbol.STX ^ chunk header ^ chunk body;
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      in TextIO.output (out_stream, msg) (*atomic output*) end;
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in
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fun standard_message out_stream ch body =
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  message out_stream ch (Position.properties_of (Position.thread_data ())) body;
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fun init_message out_stream =
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  message out_stream "A" [(Markup.pidN, process_id ())] (Session.welcome ());
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end;
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(* channels *)
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local
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fun auto_flush stream =
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  let
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    val _ = TextIO.StreamIO.setBufferMode (TextIO.getOutstream stream, IO.BLOCK_BUF);
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    fun loop () =
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      (OS.Process.sleep (Time.fromMilliseconds 50); try TextIO.flushOut stream; loop ());
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  in loop end;
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in
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fun setup_channels out =
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  let
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    val path = File.platform_path (Path.explode out);
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    val out_stream = TextIO.openOut path;  (*fifo blocks until reader is ready*)
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    val _ = OS.FileSys.remove path;  (*prevent alien access, indicate writer is ready*)
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    val _ = SimpleThread.fork false (auto_flush out_stream);
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    val _ = SimpleThread.fork false (auto_flush TextIO.stdOut);
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    val _ = SimpleThread.fork false (auto_flush TextIO.stdErr);
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  in
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    Output.status_fn   := standard_message out_stream "B";
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    Output.writeln_fn  := standard_message out_stream "C";
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    Output.priority_fn := standard_message out_stream "D";
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    Output.tracing_fn  := standard_message out_stream "E";
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    Output.warning_fn  := standard_message out_stream "F";
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    Output.error_fn    := standard_message out_stream "G";
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    Output.debug_fn    := standard_message out_stream "H";
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    Output.prompt_fn   := ignore;
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    out_stream
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  end;
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end;
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(* init *)
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fun init out =
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 (Unsynchronized.change print_mode (update (op =) isabelle_processN);
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  setup_channels out |> init_message;
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  OuterKeyword.report ();
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  Output.status (Markup.markup Markup.ready "");
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  Isar.toplevel_loop {init = true, welcome = false, sync = true, secure = true});
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end;