src/Pure/System/isabelle_process.ML
author wenzelm
Mon, 25 Oct 2010 21:23:09 +0200
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child 40134 8baded087d34
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(*  Title:      Pure/System/isabelle_process.ML
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    Author:     Makarius
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Isabelle process wrapper, based on private fifos for maximum
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robustness and performance.
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Startup phases:
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  . raw Posix process startup with uncontrolled output on stdout/stderr
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  . stdout \002: ML running
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  .. stdin/stdout/stderr freely available (raw ML loop)
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  .. protocol thread initialization
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  ... switch to in_fifo/out_fifo channels (rendezvous via open)
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  ... out_fifo INIT(pid): channels ready
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  ... out_fifo STATUS(keywords)
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  ... out_fifo READY: main loop ready
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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 add_command: string -> (string list -> unit) -> unit
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  val command: string -> string list -> unit
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  val crashes: exn list Unsynchronized.ref
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  val init: string -> 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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(* commands *)
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local
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val global_commands = Unsynchronized.ref (Symtab.empty: (string list -> unit) Symtab.table);
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in
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fun add_command name cmd = CRITICAL (fn () =>
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  Unsynchronized.change global_commands (fn cmds =>
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   (if not (Symtab.defined cmds name) then ()
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    else warning ("Redefining Isabelle process command " ^ quote name);
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    Symtab.update (name, cmd) cmds)));
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fun command name args =
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  (case Symtab.lookup (! global_commands) name of
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    NONE => error ("Undefined Isabelle process command " ^ quote name)
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  | SOME cmd => cmd args);
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end;
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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 raw_props body =
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      let
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        val robust_props = map (pairself YXML.escape_controls) raw_props;
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        val header = YXML.string_of (XML.Elem ((ch, robust_props), []));
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      in TextIO.output (out_stream, chunk header ^ chunk body) (*atomic output!*) end;
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in
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fun standard_message out_stream with_serial ch body =
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  message out_stream ch
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    ((if with_serial then cons (Markup.serialN, serial_string ()) else I)
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      (Position.properties_of (Position.thread_data ()))) body;
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fun init_message out_stream =
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  message out_stream "A" [] (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 20); try TextIO.flushOut stream; loop ());
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  in loop end;
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in
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fun setup_channels in_fifo out_fifo =
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  let
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    (*rendezvous*)
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    val in_stream = TextIO.openIn in_fifo;
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    val out_stream = TextIO.openOut out_fifo;
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    val _ = Simple_Thread.fork false (auto_flush out_stream);
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    val _ = Simple_Thread.fork false (auto_flush TextIO.stdOut);
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    val _ = Simple_Thread.fork false (auto_flush TextIO.stdErr);
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  in
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    Output.Private_Hooks.status_fn := standard_message out_stream false "B";
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    Output.Private_Hooks.report_fn := standard_message out_stream false "C";
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    Output.Private_Hooks.writeln_fn := standard_message out_stream true "D";
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    Output.Private_Hooks.tracing_fn := standard_message out_stream true "E";
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    Output.Private_Hooks.warning_fn := standard_message out_stream true "F";
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    Output.Private_Hooks.error_fn := standard_message out_stream true "G";
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    Output.Private_Hooks.urgent_message_fn := ! Output.Private_Hooks.writeln_fn;
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    Output.Private_Hooks.prompt_fn := ignore;
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    (in_stream, out_stream)
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  end;
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end;
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(* protocol loop -- uninterruptible *)
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val crashes = Unsynchronized.ref ([]: exn list);
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local
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fun recover crash =
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  (CRITICAL (fn () => Unsynchronized.change crashes (cons crash));
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    warning "Recovering from Isabelle process crash -- see also Isabelle_Process.crashes");
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fun read_chunk stream len =
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  let
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    val n =
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      (case Int.fromString len of
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        SOME n => n
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      | NONE => error ("Isabelle process: malformed chunk header " ^ quote len));
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    val chunk = TextIO.inputN (stream, n);
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    val m = size chunk;
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  in
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    if m = n then chunk
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    else error ("Isabelle process: bad chunk (" ^ string_of_int m ^ " vs. " ^ string_of_int n ^ ")")
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  end;
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fun read_command stream =
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  (case TextIO.inputLine stream of
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    NONE => raise Runtime.TERMINATE
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  | SOME line => map (read_chunk stream) (space_explode "," line));
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fun run_command name args =
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  Runtime.debugging (command name) args
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    handle exn =>
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      error ("Isabelle process command failure: " ^ name ^ "\n" ^ ML_Compiler.exn_message exn);
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in
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fun loop stream =
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  let val continue =
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    (case read_command stream of
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      [] => (Output.error_msg "Isabelle process: no input"; true)
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    | name :: args => (run_command name args; true))
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    handle Runtime.TERMINATE => false
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      | exn => (Output.error_msg (ML_Compiler.exn_message exn) handle crash => recover crash; true);
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  in if continue then loop stream else () end;
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end;
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(* init *)
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fun init in_fifo out_fifo = ignore (Simple_Thread.fork false (fn () =>
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  let
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    val _ = OS.Process.sleep (Time.fromMilliseconds 500);  (*yield to raw ML toplevel*)
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    val _ = Output.raw_stdout Symbol.STX;
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    val _ = quick_and_dirty := true;  (* FIXME !? *)
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    val _ = Context.set_thread_data NONE;
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    val _ = Unsynchronized.change print_mode
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      (fold (update op =) [isabelle_processN, Keyword.keyword_statusN, Pretty.symbolicN]);
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    val (in_stream, out_stream) = setup_channels in_fifo out_fifo;
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    val _ = init_message out_stream;
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    val _ = Keyword.status ();
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    val _ = Output.status (Markup.markup Markup.ready "process ready");
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  in loop in_stream end));
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end;
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