src/Pure/System/isabelle_process.ML
author wenzelm
Mon, 20 Feb 2012 15:36:48 +0100
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child 46774 38f113b052b1
permissions -rw-r--r--
clarified initial process startup errors: recover image load failure message (cf. 2cb7e34f6096) and suppress accidental output from raw ML toplevel;
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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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  . stderr \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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  ... rendezvous on system channel
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  ... message INIT(pid): channels ready
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  ... message RAW(keywords)
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  ... message RAW(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 is_active: unit -> bool
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  val protocol_command: string -> (string list -> unit) -> unit
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  val crashes: exn list Synchronized.var
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  val init_fifos: string -> string -> unit
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  val init_socket: 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 mode *)
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val isabelle_processN = "isabelle_process";
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fun is_active () = Print_Mode.print_mode_active isabelle_processN;
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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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(* protocol commands *)
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local
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val commands =
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  Synchronized.var "Isabelle_Process.commands" (Symtab.empty: (string list -> unit) Symtab.table);
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in
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fun protocol_command name cmd =
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  Synchronized.change 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 run_command name args =
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  (case Symtab.lookup (Synchronized.value commands) name of
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    NONE => error ("Undefined Isabelle process command " ^ quote name)
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  | SOME cmd =>
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      (Runtime.debugging cmd args handle exn =>
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        error ("Isabelle process protocol failure: " ^ name ^ "\n" ^ ML_Compiler.exn_message exn)));
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end;
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(* message channels *)
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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 do_flush mbox ch raw_props body =
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  let
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    val robust_props = map (pairself YXML.embed_controls) raw_props;
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    val header = YXML.string_of (XML.Elem ((ch, robust_props), []));
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  in Mailbox.send mbox (chunk header @ chunk body, do_flush) end;
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fun standard_message mbox opt_serial ch body =
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  if body = "" then ()
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  else
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    message false mbox ch
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      ((case opt_serial of SOME i => cons (Isabelle_Markup.serialN, string_of_int i) | _ => I)
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        (Position.properties_of (Position.thread_data ()))) body;
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fun message_output mbox channel =
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  let
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    fun flush () = ignore (try System_Channel.flush channel);
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    fun loop receive =
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      (case receive mbox of
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        SOME (msg, do_flush) =>
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         (List.app (fn s => System_Channel.output channel s) msg;
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          if do_flush then flush () else ();
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          loop (Mailbox.receive_timeout (seconds 0.02)))
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      | NONE => (flush (); loop (SOME o Mailbox.receive)));
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  in fn () => loop (SOME o Mailbox.receive) end;
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in
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fun setup_channels channel =
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  let
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    val _ = TextIO.StreamIO.setBufferMode (TextIO.getOutstream TextIO.stdOut, IO.LINE_BUF);
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    val _ = TextIO.StreamIO.setBufferMode (TextIO.getOutstream TextIO.stdErr, IO.LINE_BUF);
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    val mbox = Mailbox.create () : (string list * bool) Mailbox.T;
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    val _ = Simple_Thread.fork false (message_output mbox channel);
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  in
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    Output.Private_Hooks.status_fn := standard_message mbox NONE "B";
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    Output.Private_Hooks.report_fn := standard_message mbox NONE "C";
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    Output.Private_Hooks.writeln_fn := (fn s => standard_message mbox (SOME (serial ())) "D" s);
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    Output.Private_Hooks.tracing_fn := (fn s => standard_message mbox (SOME (serial ())) "E" s);
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    Output.Private_Hooks.warning_fn := (fn s => standard_message mbox (SOME (serial ())) "F" s);
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    Output.Private_Hooks.error_fn := (fn (i, s) => standard_message mbox (SOME i) "G" s);
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    Output.Private_Hooks.raw_message_fn := message true mbox "H";
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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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    message true mbox "A" [] (Session.welcome ())
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  end;
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end;
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(* protocol loop -- uninterruptible *)
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val crashes = Synchronized.var "Isabelle_Process.crashes" ([]: exn list);
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local
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fun recover crash =
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  (Synchronized.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 channel 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 = System_Channel.inputN channel 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 channel =
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  (case System_Channel.input_line channel of
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    NONE => raise Runtime.TERMINATE
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  | SOME line => map (read_chunk channel) (space_explode "," line));
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in
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fun loop channel =
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  let val continue =
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    (case read_command channel 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 channel else () end;
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end;
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(* init *)
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fun init rendezvous = ignore (Simple_Thread.fork false (fn () =>
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  let
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    val _ = OS.Process.sleep (seconds 0.5);  (*yield to raw ML toplevel*)
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    val _ = Output.physical_stderr Symbol.STX;
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    val _ = quick_and_dirty := true;
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    val _ = Goal.parallel_proofs := 0;
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    val _ =
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      if Multithreading.max_threads_value () < 2
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      then Multithreading.max_threads := 2 else ();
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    val _ = Context.set_thread_data NONE;
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    val _ =
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      Unsynchronized.change print_mode
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        (fn mode =>
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          (mode @ [Syntax_Trans.no_bracketsN, Syntax_Trans.no_type_bracketsN])
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          |> fold (update op =)
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            [Symbol.xsymbolsN, isabelle_processN, Keyword.keyword_statusN, Pretty.symbolicN]);
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    val channel = rendezvous ();
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    val _ = setup_channels channel;
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    val _ = Keyword.status ();
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    val _ = Thy_Info.status ();
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    val _ = Output.raw_message Isabelle_Markup.ready "";
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  in loop channel end));
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fun init_fifos fifo1 fifo2 = init (fn () => System_Channel.fifo_rendezvous fifo1 fifo2);
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fun init_socket name = init (fn () => System_Channel.socket_rendezvous name);
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end;
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