(*  Title:      Pure/ML-Systems/polyml_common.ML

 Compatibility file for Poly/ML -- common part for 5.x.

 *)

 exception Interrupt = SML90.Interrupt;

 use "ML-Systems/exn.ML";

 use "ML-Systems/multithreading.ML";

 use "ML-Systems/time_limit.ML";

 use "ML-Systems/system_shell.ML";

 use "ML-Systems/ml_pretty.ML";

 use "ML-Systems/use_context.ML";

 (** ML system and platform related **)

 val forget_structure = PolyML.Compiler.forgetStructure;

 (* Compiler options *)

 val ml_system_fix_ints = false;

 PolyML.Compiler.printInAlphabeticalOrder := false;

 PolyML.Compiler.maxInlineSize := 80;

 (* old Poly/ML emulation *)

 local

   val orig_exit = exit;

 in

   open PolyML;

   val exit = orig_exit;

   fun quit () = exit 0;

 end;

 (* restore old-style character / string functions *)

 val ord = SML90.ord;

 val chr = SML90.chr;

 val explode = SML90.explode;

 val implode = SML90.implode;

 (* compiler-independent timing functions *)

 fun start_timing () =

   let

     val timer = Timer.startCPUTimer ();

     val time = Timer.checkCPUTimer timer;

   in (timer, time) end;

 fun end_timing (timer, {sys, usr}) =

   let

     open Time;  (*...for Time.toString, Time.+ and Time.- *)

     val {sys = sys2, usr = usr2} = Timer.checkCPUTimer timer;

     val user = usr2 - usr;

     val all = user + sys2 - sys;

     val message = "User " ^ toString user ^ "  All "^ toString all ^ " secs" handle Time => "";

   in {message = message, user = user, all = all} end;

 fun check_timer timer =

   let

     val {sys, usr} = Timer.checkCPUTimer timer;

     val gc = Timer.checkGCTime timer;    (* FIXME already included in usr? *)

   in (sys, usr, gc) end;

 (* prompts *)

 fun ml_prompts p1 p2 = (PolyML.Compiler.prompt1 := p1; PolyML.Compiler.prompt2 := p2);

 (* print depth *)

 local

   val depth = ref 10;

 in

   fun get_print_depth () = ! depth;

   fun print_depth n = (depth := n; PolyML.print_depth n);

 end;

 (** interrupts **)

 local

 val sig_int = 2;

 val default_handler = Signal.SIG_HANDLE (fn _ => Process.interruptConsoleProcesses ());

 val _ = Signal.signal (sig_int, default_handler);

 val _ = PolyML.onEntry (fn () => (Signal.signal (sig_int, default_handler); ()));

 fun change_signal new_handler f x =

   let

     (*RACE wrt. other signals!*)

     val old_handler = Signal.signal (sig_int, new_handler);

     val result = Exn.capture (f old_handler) x;

     val _ = Signal.signal (sig_int, old_handler);

   in Exn.release result end;

 in

 fun interruptible f = change_signal default_handler (fn _ => f);

 fun uninterruptible f =

   change_signal Signal.SIG_IGN

     (fn old_handler => f (fn g => change_signal old_handler (fn _ => g)));

 end;

 (** OS related **)

 (* current directory *)

 val cd = OS.FileSys.chDir;

 val pwd = OS.FileSys.getDir;

 fun process_id () =

   Word.fmt StringCvt.DEC (Word.fromLargeWord (Posix.Process.pidToWord (Posix.ProcEnv.getpid ())));

 (* getenv *)

 fun getenv var =

   (case OS.Process.getEnv var of

     NONE => ""

   | SOME txt => txt);

 (* profile execution *)

 fun profile 0 f x = f x

   | profile n f x =

       let

         val _ = RunCall.run_call1 RuntimeCalls.POLY_SYS_profiler n;

         val res = Exn.capture f x;

         val _ = RunCall.run_call1 RuntimeCalls.POLY_SYS_profiler 0;

       in Exn.release res end;