wenzelm@30174
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(* Title: Pure/System/isabelle_process.ML
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wenzelm@25528
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Author: Makarius
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wenzelm@25528
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wenzelm@38691
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Isabelle process wrapper, based on private fifos for maximum
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wenzelm@38691
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robustness and performance.
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wenzelm@39797
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wenzelm@39797
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Startup phases:
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wenzelm@39797
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. raw Posix process startup with uncontrolled output on stdout/stderr
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wenzelm@39797
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. stdout \002: ML running
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wenzelm@39797
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.. stdin/stdout/stderr freely available (raw ML loop)
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wenzelm@39797
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.. protocol thread initialization
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wenzelm@39797
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... switch to in_fifo/out_fifo channels (rendezvous via open)
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wenzelm@39797
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... out_fifo INIT(pid): channels ready
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wenzelm@39797
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... out_fifo STATUS(keywords)
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wenzelm@39797
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... out_fifo READY: main loop ready
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wenzelm@25528
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*)
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wenzelm@25528
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wenzelm@25528
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signature ISABELLE_PROCESS =
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wenzelm@25528
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sig
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wenzelm@43772
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val is_active: unit -> bool
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wenzelm@38568
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val add_command: string -> (string list -> unit) -> unit
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wenzelm@38568
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val command: string -> string list -> unit
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wenzelm@38568
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val crashes: exn list Unsynchronized.ref
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wenzelm@38551
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val init: string -> string -> unit
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end;
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wenzelm@25528
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wenzelm@31800
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structure Isabelle_Process: ISABELLE_PROCESS =
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wenzelm@25528
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struct
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wenzelm@25528
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wenzelm@43772
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(* print mode *)
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wenzelm@25554
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wenzelm@25748
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val isabelle_processN = "isabelle_process";
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wenzelm@25748
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wenzelm@43772
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fun is_active () = Print_Mode.print_mode_active isabelle_processN;
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wenzelm@43772
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wenzelm@26550
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val _ = Output.add_mode isabelle_processN Output.default_output Output.default_escape;
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wenzelm@28036
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val _ = Markup.add_mode isabelle_processN YXML.output_markup;
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wenzelm@25841
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wenzelm@25841
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wenzelm@38568
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(* commands *)
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wenzelm@38568
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wenzelm@38568
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local
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wenzelm@38568
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wenzelm@38568
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val global_commands = Unsynchronized.ref (Symtab.empty: (string list -> unit) Symtab.table);
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wenzelm@38568
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in
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wenzelm@38568
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fun add_command name cmd = CRITICAL (fn () =>
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wenzelm@38568
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Unsynchronized.change global_commands (fn cmds =>
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wenzelm@38568
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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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wenzelm@38568
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wenzelm@38568
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fun command name args =
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wenzelm@38568
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(case Symtab.lookup (! global_commands) name of
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wenzelm@38568
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NONE => error ("Undefined Isabelle process command " ^ quote name)
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wenzelm@38568
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| SOME cmd => cmd args);
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wenzelm@38568
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end;
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wenzelm@38568
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wenzelm@40394
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(* message channels *)
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wenzelm@25841
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wenzelm@25841
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local
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wenzelm@25810
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wenzelm@40394
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fun chunk s = [string_of_int (size s), "\n", s];
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wenzelm@26574
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wenzelm@34102
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fun message _ _ _ "" = ()
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wenzelm@40394
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| message mbox ch raw_props body =
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wenzelm@34102
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let
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wenzelm@38691
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val robust_props = map (pairself YXML.escape_controls) raw_props;
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wenzelm@38691
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val header = YXML.string_of (XML.Elem ((ch, robust_props), []));
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wenzelm@40394
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in Mailbox.send mbox (chunk header @ chunk body) end;
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wenzelm@25554
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wenzelm@40394
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fun standard_message mbox with_serial ch body =
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wenzelm@40394
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message mbox ch
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wenzelm@39778
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((if with_serial then cons (Markup.serialN, serial_string ()) else I)
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wenzelm@39778
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(Position.properties_of (Position.thread_data ()))) body;
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wenzelm@25554
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wenzelm@40394
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fun message_output mbox out_stream =
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wenzelm@28188
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let
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wenzelm@40394
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fun loop receive =
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wenzelm@40394
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(case receive mbox of
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wenzelm@40394
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SOME msg =>
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wenzelm@40394
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(List.app (fn s => TextIO.output (out_stream, s)) msg;
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wenzelm@40553
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loop (Mailbox.receive_timeout (seconds 0.02)))
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wenzelm@40394
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| NONE => (try TextIO.flushOut out_stream; loop (SOME o Mailbox.receive)));
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in fn () => loop (SOME o Mailbox.receive) end;
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wenzelm@28188
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in
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fun setup_channels in_fifo out_fifo =
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wenzelm@28189
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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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wenzelm@39799
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wenzelm@40394
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val _ = TextIO.StreamIO.setBufferMode (TextIO.getOutstream TextIO.stdOut, IO.LINE_BUF);
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wenzelm@40394
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val _ = TextIO.StreamIO.setBufferMode (TextIO.getOutstream TextIO.stdErr, IO.LINE_BUF);
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wenzelm@40394
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wenzelm@40394
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val mbox = Mailbox.create () : string list Mailbox.T;
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wenzelm@40394
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val _ = Simple_Thread.fork false (message_output mbox out_stream);
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wenzelm@28044
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in
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Output.Private_Hooks.status_fn := standard_message mbox false "B";
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Output.Private_Hooks.report_fn := standard_message mbox false "C";
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Output.Private_Hooks.writeln_fn := standard_message mbox true "D";
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Output.Private_Hooks.tracing_fn := standard_message mbox true "E";
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Output.Private_Hooks.warning_fn := standard_message mbox true "F";
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Output.Private_Hooks.error_fn := standard_message mbox true "G";
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wenzelm@40393
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Output.Private_Hooks.urgent_message_fn := ! Output.Private_Hooks.writeln_fn;
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wenzelm@40393
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Output.Private_Hooks.prompt_fn := ignore;
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wenzelm@40394
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message mbox "A" [] (Session.welcome ());
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wenzelm@40394
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in_stream
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end;
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wenzelm@28188
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end;
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wenzelm@25841
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wenzelm@39511
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(* protocol loop -- uninterruptible *)
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wenzelm@38568
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wenzelm@38568
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val crashes = Unsynchronized.ref ([]: exn list);
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local
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wenzelm@38568
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wenzelm@38568
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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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wenzelm@38568
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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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wenzelm@38568
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val chunk = TextIO.inputN (stream, n);
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wenzelm@38568
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val m = size chunk;
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wenzelm@38568
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in
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wenzelm@38568
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if m = n then chunk
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wenzelm@38568
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else error ("Isabelle process: bad chunk (" ^ string_of_int m ^ " vs. " ^ string_of_int n ^ ")")
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wenzelm@38568
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end;
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wenzelm@38568
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wenzelm@38568
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fun read_command stream =
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wenzelm@38568
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(case TextIO.inputLine stream of
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NONE => raise Runtime.TERMINATE
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wenzelm@38568
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| SOME line => map (read_chunk stream) (space_explode "," line));
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wenzelm@38568
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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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wenzelm@38568
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fun loop stream =
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wenzelm@38568
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let val continue =
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wenzelm@38568
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(case read_command stream of
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wenzelm@38568
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[] => (Output.error_msg "Isabelle process: no input"; true)
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wenzelm@38568
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| name :: args => (run_command name args; true))
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handle Runtime.TERMINATE => false
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wenzelm@38568
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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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wenzelm@38568
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end;
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wenzelm@38568
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wenzelm@38568
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wenzelm@25554
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(* init *)
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wenzelm@25554
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wenzelm@39797
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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 (seconds 0.5); (*yield to raw ML toplevel*)
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wenzelm@40026
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val _ = Output.raw_stdout Symbol.STX;
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wenzelm@39797
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wenzelm@40767
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val _ = quick_and_dirty := true;
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wenzelm@40764
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val _ = Goal.parallel_proofs := 0;
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wenzelm@39797
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val _ = Context.set_thread_data NONE;
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wenzelm@44546
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val _ =
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wenzelm@44546
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Unsynchronized.change print_mode
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wenzelm@44546
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(fold (update op =)
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wenzelm@44546
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[Symbol.xsymbolsN, isabelle_processN, Keyword.keyword_statusN, Pretty.symbolicN]);
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wenzelm@39797
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wenzelm@40394
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val in_stream = setup_channels in_fifo out_fifo;
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wenzelm@38551
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val _ = Keyword.status ();
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wenzelm@44548
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val _ = Thy_Info.status ();
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wenzelm@39916
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val _ = Output.status (Markup.markup Markup.ready "process ready");
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wenzelm@39797
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in loop in_stream end));
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wenzelm@25528
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end;
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