src/HOL/Tools/ATP/watcher.ML
author paulson
Mon Sep 19 18:30:22 2005 +0200 (2005-09-19)
changeset 17488 67376a311a2b
parent 17484 f6a225f97f0a
child 17502 8836793df947
permissions -rw-r--r--
further simplification of the Isabelle-ATP linkup
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(*  Title:      Watcher.ML
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    ID:         $Id$
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    Author:     Claire Quigley
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    Copyright   2004  University of Cambridge
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 *)
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 (***************************************************************************)
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 (*  The watcher process starts a resolution process when it receives a     *)
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(*  message from Isabelle                                                  *)
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(*  Signals Isabelle, puts output of child into pipe to Isabelle,          *)
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(*  and removes dead processes.  Also possible to kill all the resolution  *)
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(*  processes currently running.                                           *)
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(*  Hardwired version of where to pick up the tptp files for the moment    *)
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(***************************************************************************)
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signature WATCHER =
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sig
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(*****************************************************************************************)
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(*  Send request to Watcher for multiple spasses to be called for filenames in arg       *)
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(*  callResProvers (outstreamtoWatcher, prover name,prover-command, (settings,file) list             *)
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(*****************************************************************************************)
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val callResProvers :
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    TextIO.outstream * (string*string*string*string*string) list 
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    -> unit
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(************************************************************************)
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(* Send message to watcher to kill currently running resolution provers *)
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(************************************************************************)
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val callSlayer : TextIO.outstream -> unit
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(**********************************************************)
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(* Start a watcher and set up signal handlers             *)
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(**********************************************************)
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val createWatcher : 
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    thm * (ResClause.clause * thm) Array.array -> 
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    TextIO.instream * TextIO.outstream * Posix.Process.pid
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(**********************************************************)
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(* Kill watcher process                                   *)
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(**********************************************************)
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val killWatcher : Posix.Process.pid -> unit
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val killWatcher' : int -> unit
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end
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structure Watcher: WATCHER =
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struct
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open Recon_Transfer
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val goals_being_watched = ref 0;
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(*****************************************)
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(*  The result of calling createWatcher  *)
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(*****************************************)
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datatype proc = PROC of {
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        pid : Posix.Process.pid,
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        instr : TextIO.instream,
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        outstr : TextIO.outstream
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      };
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(*****************************************)
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(*  The result of calling executeToList  *)
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(*****************************************)
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datatype cmdproc = CMDPROC of {
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        prover: string,             (* Name of the resolution prover used, e.g. Vampire, SPASS *)
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        cmd:  string,              (* The file containing the goal for res prover to prove *)     
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        goalstring: string,         (* string representation of subgoal*) 
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        proc_handle : (TextIO.instream,TextIO.outstream) Unix.proc,
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        instr : TextIO.instream,   (*  Input stream to child process *)
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        outstr : TextIO.outstream  (*  Output stream from child process *)
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      };
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type signal = Posix.Signal.signal
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datatype exit_status = datatype Posix.Process.exit_status
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val fromStatus = Posix.Process.fromStatus
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fun reap(pid, instr, outstr) =
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  let val u = TextIO.closeIn instr;
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      val u = TextIO.closeOut outstr;
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      val (_, status) = Posix.Process.waitpid(Posix.Process.W_CHILD pid, [])
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  in
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	  status
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  end
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fun fdReader (name : string, fd : Posix.IO.file_desc) =
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	  Posix.IO.mkTextReader {initBlkMode = true,name = name,fd = fd };
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fun fdWriter (name, fd) =
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          Posix.IO.mkTextWriter {
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	      appendMode = false,
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              initBlkMode = true,
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              name = name,  
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              chunkSize=4096,
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              fd = fd};
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fun openOutFD (name, fd) =
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	  TextIO.mkOutstream (
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	    TextIO.StreamIO.mkOutstream (
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	      fdWriter (name, fd), IO.BLOCK_BUF));
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fun openInFD (name, fd) =
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	  TextIO.mkInstream (
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	    TextIO.StreamIO.mkInstream (
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	      fdReader (name, fd), ""));
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fun killChild child_handle = Unix.reap child_handle 
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fun childInfo (PROC{pid,instr,outstr }) = (pid,(instr,outstr));
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fun cmdstreamsOf (CMDPROC{instr,outstr,...}) = (instr, outstr);
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fun cmdInStream (CMDPROC{instr,outstr,...}) = instr;
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fun cmdchildInfo (CMDPROC{prover,cmd,proc_handle,goalstring,instr,outstr}) = 
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  (prover,(cmd, (instr,outstr)));
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fun cmdchildHandle (CMDPROC{prover,cmd,goalstring,proc_handle,instr,outstr})  = 
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  proc_handle;
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fun cmdProver (CMDPROC{prover,cmd,goalstring,proc_handle,instr,outstr})  =
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  prover;
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fun cmdGoal (CMDPROC{prover,cmd,goalstring,proc_handle,instr,outstr})  =
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  goalstring;
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(********************************************************************************)
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(*    gets individual args from instream and concatenates them into a list      *)
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(********************************************************************************)
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fun getArgs (fromParentStr, toParentStr, ys) =  
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  let val thisLine = TextIO.input fromParentStr
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  in ys@[thisLine] end
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(********************************************************************************)
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(*  Send request to Watcher for a vampire to be called for filename in arg      *)
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(********************************************************************************)
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fun callResProver (toWatcherStr,  arg) = 
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      (TextIO.output (toWatcherStr, arg^"\n"); 
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       TextIO.flushOut toWatcherStr)
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(*****************************************************************************************)
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(*  Send request to Watcher for multiple provers to be called for filenames in arg       *)
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(*  need to do the dfg stuff in the watcher, not here! send over the clasimp and stuff files too*)
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(*****************************************************************************************)
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(*Uses the $-character to separate items sent to watcher*)
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fun callResProvers (toWatcherStr,  []) = 
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      (TextIO.output (toWatcherStr, "End of calls\n");  TextIO.flushOut toWatcherStr)
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|   callResProvers (toWatcherStr,
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                    (prover,goalstring, proverCmd,settings, 
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                     probfile)  ::  args) =
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      let val _ = File.write (File.tmp_path (Path.basic "tog_comms"))
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                             (prover^goalstring^proverCmd^settings^
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                              probfile)
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      in TextIO.output (toWatcherStr,    
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            (prover^"$"^goalstring^"$"^proverCmd^"$"^
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             settings^"$"^probfile^"\n"));
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         goals_being_watched := (!goals_being_watched) + 1;
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	 TextIO.flushOut toWatcherStr;
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	 callResProvers (toWatcherStr,args)
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      end   
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(**************************************************************)
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(* Send message to watcher to kill currently running vampires *)
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(**************************************************************)
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fun callSlayer toWatcherStr = (TextIO.output (toWatcherStr, "Kill vampires\n"); 
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                            TextIO.flushOut toWatcherStr)
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(**************************************************************)
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(* Remove \n token from a vampire goal filename and extract   *)
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(* prover, proverCmd, settings and file from input string     *)
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(**************************************************************)
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fun separateFields str =
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  let val _ = File.append (File.tmp_path (Path.basic "sep_field"))
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                          ("In separateFields, str is: " ^ str ^ "\n\n") 
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      val [prover,goalstring,proverCmd,settingstr,probfile] = 
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          String.tokens (fn c => c = #"$") str
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      val settings = String.tokens (fn c => c = #"%") settingstr
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      val _ = File.append (File.tmp_path (Path.basic "sep_comms"))                                                                                
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                  ("Sep comms are: "^ str ^"**"^
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                   prover^" goalstr:  "^goalstring^
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                   "\n provercmd: "^proverCmd^
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                   "\n prob  "^probfile^"\n\n")
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  in
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     (prover,goalstring, proverCmd, settings, probfile)
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  end
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val remove_newlines = String.translate (fn c => if c = #"\n" then "" else str c);
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fun getCmd cmdStr = 
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  let val cmdStr' = remove_newlines cmdStr
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  in
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      File.write (File.tmp_path (Path.basic"sepfields_call")) 
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		 ("about to call separateFields with " ^ cmdStr');
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      separateFields cmdStr'
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  end;
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(**************************************************************)
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(* Get commands from Isabelle                                 *)
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(**************************************************************)
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fun getCmds (toParentStr,fromParentStr, cmdList) = 
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  let val thisLine = TextIO.inputLine fromParentStr 
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      val _ = File.append (File.tmp_path (Path.basic "parent_comms")) thisLine
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  in
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     if thisLine = "End of calls\n" then cmdList
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     else if thisLine = "Kill children\n"
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     then 
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	 (   TextIO.output (toParentStr,thisLine ); 
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	     TextIO.flushOut toParentStr;
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	   (("","","Kill children",[],"")::cmdList)
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	  )
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     else let val thisCmd = getCmd thisLine 
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	       (*********************************************************)
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	       (* thisCmd = (prover,proverCmd, settings, file)*)
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	       (* i.e. put back into tuple format                       *)
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	       (*********************************************************)
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	   in
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	     (*TextIO.output (toParentStr, thisCmd); 
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	       TextIO.flushOut toParentStr;*)
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	       getCmds (toParentStr, fromParentStr, thisCmd::cmdList)
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	   end
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  end
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(**************************************************************)
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(*  Get Io-descriptor for polling of an input stream          *)
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(**************************************************************)
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fun getInIoDesc someInstr = 
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    let val (rd, buf) = TextIO.StreamIO.getReader(TextIO.getInstream someInstr)
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        val _ = TextIO.output (TextIO.stdOut, buf)
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        val ioDesc = 
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	    case rd
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	      of TextPrimIO.RD{ioDesc = SOME iod, ...} =>SOME iod
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	       | _ => NONE
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     in (* since getting the reader will have terminated the stream, we need
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	 * to build a new stream. *)
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	TextIO.setInstream(someInstr, TextIO.StreamIO.mkInstream(rd, buf));
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	ioDesc
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    end
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(*************************************)
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(*  Set up a Watcher Process         *)
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(*************************************)
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fun getProofCmd (a,c,d,e,f) = d
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fun prems_string_of th =
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  Meson.concat_with_and (map (Sign.string_of_term (sign_of_thm th)) (prems_of th))
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fun setupWatcher (thm,clause_arr) = 
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  let
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    (** pipes for communication between parent and watcher **)
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    val p1 = Posix.IO.pipe ()
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    val p2 = Posix.IO.pipe ()
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    fun closep () = 
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	 (Posix.IO.close (#outfd p1); 
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	  Posix.IO.close (#infd p1);
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	  Posix.IO.close (#outfd p2); 
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	  Posix.IO.close (#infd p2))
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    (***********************************************************)
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    (****** fork a watcher process and get it set up and going *)
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    (***********************************************************)
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    fun startWatcher procList =
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     (case  Posix.Process.fork() (***************************************)
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      of SOME pid =>  pid           (* parent - i.e. main Isabelle process *)
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				    (***************************************)
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				      (*************************)
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       | NONE => let                  (* child - i.e. watcher  *)
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	   val oldchildin = #infd p1  (*************************)
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	   val fromParent = Posix.FileSys.wordToFD 0w0
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	   val oldchildout = #outfd p2
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	   val toParent = Posix.FileSys.wordToFD 0w1
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	   val fromParentIOD = Posix.FileSys.fdToIOD fromParent
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	   val fromParentStr = openInFD ("_exec_in_parent", fromParent)
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	   val toParentStr = openOutFD ("_exec_out_parent", toParent)
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	   val _ = debug ("subgoals forked to startWatcher: "^ prems_string_of thm);
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	   fun killChildren [] = ()
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	|      killChildren  (child_handle::children) =
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	         (killChild child_handle; killChildren children)
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	 (*************************************************************)
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	 (* take an instream and poll its underlying reader for input *)
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	 (*************************************************************)
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	 fun pollParentInput () = 
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	   let val pd = OS.IO.pollDesc fromParentIOD
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	   in 
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	     if isSome pd then 
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		 let val pd' = OS.IO.pollIn (valOf pd)
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		     val pdl = OS.IO.poll ([pd'], SOME (Time.fromMilliseconds 2000)) 
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		     val _ = File.append (File.tmp_path (Path.basic "parent_poll")) 
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		       ("In parent_poll\n")	
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		 in
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		    if null pdl 
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		    then
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		       NONE
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		    else if (OS.IO.isIn (hd pdl)) 
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			 then SOME (getCmds (toParentStr, fromParentStr, []))
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			 else NONE
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		 end
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	       else NONE
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	   end
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	  fun pollChildInput fromStr = 
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	   let val _ = File.append (File.tmp_path (Path.basic "child_poll")) 
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			 ("In child_poll\n")
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	       val iod = getInIoDesc fromStr
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	   in 
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	     if isSome iod 
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	     then 
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	       let val pd = OS.IO.pollDesc (valOf iod)
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	       in 
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	       if isSome pd then 
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		   let val pd' = OS.IO.pollIn (valOf pd)
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		       val pdl = OS.IO.poll ([pd'], SOME (Time.fromMilliseconds 2000)) 
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		   in
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		      if null pdl 
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		      then
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			(File.append (File.tmp_path (Path.basic"child_poll_res")) "Null pdl\n"; 
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			 NONE)
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		      else if OS.IO.isIn (hd pdl)
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		      then
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			   let val inval =  (TextIO.inputLine fromStr)
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			       val _ = File.append (File.tmp_path (Path.basic "child_poll_res")) (inval^"\n")
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			   in SOME inval end
paulson@17306
   352
		      else
paulson@17306
   353
                        (File.append (File.tmp_path (Path.basic"child_poll_res")) "Null pdl \n";
paulson@17306
   354
                         NONE)
paulson@17306
   355
		   end
paulson@17306
   356
		 else NONE
paulson@17306
   357
		 end
paulson@17306
   358
	     else NONE
paulson@17234
   359
	end
quigley@15642
   360
quigley@15642
   361
paulson@17234
   362
	(****************************************************************************)
paulson@17234
   363
	(* Check all vampire processes currently running for output                 *)
paulson@17234
   364
	(****************************************************************************) 
paulson@17234
   365
						   (*********************************)
paulson@17234
   366
	 fun checkChildren ([], toParentStr) = []  (*** no children to check ********)
paulson@17234
   367
						   (*********************************)
paulson@17234
   368
	 |   checkChildren ((childProc::otherChildren), toParentStr) = 
paulson@17234
   369
	       let val _ = File.append (File.tmp_path (Path.basic "child_check")) 
paulson@17305
   370
			      ("In check child, length of queue:"^
paulson@17484
   371
			       string_of_int (length (childProc::otherChildren)))
paulson@17234
   372
		   val (childInput,childOutput) =  cmdstreamsOf childProc
paulson@17234
   373
		   val child_handle= cmdchildHandle childProc
paulson@17234
   374
		   (* childCmd is the .dfg file that the problem is in *)
paulson@17234
   375
		   val childCmd = fst(snd (cmdchildInfo childProc))
paulson@17484
   376
		   val _ = File.append (File.tmp_path (Path.basic "child_check")) 
paulson@17484
   377
			      ("\nchildCmd = " ^ childCmd)
paulson@17234
   378
		   (* now get the number of the subgoal from the filename *)
paulson@17305
   379
		   val path_parts = String.tokens(fn c => c = #"/") childCmd
paulson@17305
   380
		   val digits = String.translate 
paulson@17305
   381
		                  (fn c => if Char.isDigit c then str c else "")
paulson@17305
   382
		                  (List.last path_parts);
paulson@17484
   383
		   val sg_num =
paulson@17484
   384
		     (case Int.fromString digits of SOME n => n
paulson@17484
   385
                        | NONE => (File.append (File.tmp_path (Path.basic "child_check")) 
paulson@17484
   386
                                   "\nWatcher could not read subgoal nunber!!";
paulson@17484
   387
                                   raise ERROR));
paulson@17234
   388
		   val childIncoming = pollChildInput childInput
paulson@17484
   389
		   val _ = File.append (File.tmp_path (Path.basic "child_check")) 
paulson@17484
   390
			         "\nfinished polling child"
paulson@17234
   391
		   val parentID = Posix.ProcEnv.getppid()
paulson@17234
   392
		   val prover = cmdProver childProc
paulson@17484
   393
		   val prems_string = prems_string_of thm
paulson@17234
   394
		   val goalstring = cmdGoal childProc							
paulson@17484
   395
		   val _ =  File.append (File.tmp_path (Path.basic "child_check")) 
paulson@17484
   396
		             ("\nsubgoals forked to checkChildren: " ^ 
paulson@17484
   397
		              space_implode "\n" [prems_string,prover,goalstring])
paulson@17234
   398
	       in 
paulson@17306
   399
		 if isSome childIncoming
paulson@17234
   400
		 then 
paulson@17306
   401
		   (* check here for prover label on child*)
paulson@17484
   402
		   let val _ = File.append (File.tmp_path (Path.basic "child_check")) 
paulson@17484
   403
			         "\nInput available from childIncoming" 
paulson@17306
   404
		       val childDone = (case prover of
paulson@17488
   405
			   "vampire" => AtpCommunication.checkVampProofFound(childInput, toParentStr, parentID,goalstring, childCmd, clause_arr)  
paulson@17488
   406
			    | "E" => AtpCommunication.checkEProofFound(childInput, toParentStr, parentID,goalstring, childCmd, clause_arr)             
paulson@17484
   407
			  |"spass" => AtpCommunication.checkSpassProofFound(childInput, toParentStr, parentID,goalstring, childCmd, thm, sg_num,clause_arr)  )
paulson@17306
   408
		    in
paulson@17484
   409
		     if childDone
paulson@17306
   410
		     then (* child has found a proof and transferred it *)
paulson@17306
   411
			(* Remove this child and go on to check others*)
paulson@17306
   412
			(**********************************************)
paulson@17306
   413
			(Unix.reap child_handle;
paulson@17306
   414
			 checkChildren(otherChildren, toParentStr))
paulson@17306
   415
		     else 
paulson@17306
   416
			(**********************************************)
paulson@17306
   417
			(* Keep this child and go on to check others  *)
paulson@17306
   418
			(**********************************************)
paulson@17306
   419
		       (childProc::(checkChildren (otherChildren, toParentStr)))
paulson@17306
   420
		  end
paulson@17306
   421
		else
paulson@17484
   422
		  (File.append (File.tmp_path (Path.basic "child_check"))
paulson@17484
   423
		               "No child output";
paulson@17306
   424
		   childProc::(checkChildren (otherChildren, toParentStr)))
paulson@17234
   425
	       end
quigley@15642
   426
paulson@17234
   427
	
paulson@17234
   428
     (********************************************************************)                  
paulson@17234
   429
     (* call resolution processes                                        *)
paulson@17234
   430
     (* settings should be a list of strings                             *)
paulson@17234
   431
     (* e.g. ["-t 300", "-m 100000"]         (TextIO.input instr)^                            *)
paulson@17234
   432
     (* takes list of (string, string, string list, string)list proclist *)
paulson@17234
   433
     (********************************************************************)
quigley@15642
   434
quigley@16039
   435
paulson@16061
   436
(*** add subgoal id num to this *)
paulson@17234
   437
	fun execCmds  [] procList = procList
paulson@17422
   438
	|   execCmds  ((prover, goalstring,proverCmd,settings,file)::cmds) procList  =
paulson@17317
   439
	      let val _ = File.write (File.tmp_path (Path.basic "exec_child"))  
paulson@17317
   440
	                    (space_implode "\n" 
paulson@17317
   441
	                      (["About to execute command for goal:",
paulson@17317
   442
	                        goalstring, proverCmd] @ settings @
paulson@17317
   443
	                       [file, Date.toString(Date.fromTimeLocal(Time.now()))]))
paulson@17317
   444
	          val childhandle:(TextIO.instream,TextIO.outstream) Unix.proc  = 
paulson@17234
   445
		       (Unix.execute(proverCmd, (settings@[file])))
paulson@17234
   446
		  val (instr, outstr) = Unix.streamsOf childhandle
paulson@17234
   447
		  
paulson@17234
   448
		  val newProcList = (CMDPROC{
paulson@17234
   449
				       prover = prover,
paulson@17234
   450
				       cmd = file,
paulson@17234
   451
				       goalstring = goalstring,
paulson@17234
   452
				       proc_handle = childhandle,
paulson@17234
   453
				       instr = instr,
paulson@17234
   454
				       outstr = outstr }) :: procList
paulson@17234
   455
     
paulson@17234
   456
		  val _ = File.append (File.tmp_path (Path.basic "exec_child")) 
paulson@17317
   457
			    ("\nFinished at " ^
paulson@17317
   458
			     Date.toString(Date.fromTimeLocal(Time.now())))
paulson@17234
   459
	      in
paulson@17234
   460
		Posix.Process.sleep (Time.fromSeconds 1); 
paulson@17234
   461
		execCmds cmds newProcList
paulson@17234
   462
	      end
quigley@15642
   463
quigley@16039
   464
paulson@17234
   465
     (****************************************)                  
paulson@17234
   466
     (* call resolution processes remotely   *)
paulson@17234
   467
     (* settings should be a list of strings *)
paulson@17317
   468
     (* e.g. ["-t300", "-m100000"]         *)
paulson@17234
   469
     (****************************************)
paulson@16061
   470
paulson@17234
   471
      (*  fun execRemoteCmds  [] procList = procList
paulson@17422
   472
	|   execRemoteCmds ((prover, goalstring,proverCmd ,settings,file)::cmds) procList  =  
paulson@17422
   473
	      let val  newProcList =  mySshExecuteToList ("/usr/bin/ssh",([prover,goalstring,"-t", "shep"]@[proverCmd]@settings@[file]), procList)
paulson@17422
   474
		  in
paulson@17422
   475
		       execRemoteCmds  cmds newProcList
paulson@17422
   476
		  end
quigley@16039
   477
*)
quigley@15642
   478
paulson@17234
   479
     (**********************************************)                  
paulson@17234
   480
     (* Watcher Loop                               *)
paulson@17234
   481
     (**********************************************)
paulson@17306
   482
         val iterations_left = ref 1000;  (*200 seconds, 5 iterations per sec*)
paulson@16061
   483
paulson@17234
   484
	 fun keepWatching (toParentStr, fromParentStr,procList) = 
paulson@17317
   485
	   let fun loop procList =  
paulson@17234
   486
		let val _ = Posix.Process.sleep (Time.fromMilliseconds 200)
paulson@17234
   487
		    val cmdsFromIsa = pollParentInput ()
paulson@17306
   488
		    fun killchildHandler ()  = 
paulson@17306
   489
			  (TextIO.output(toParentStr, "Timeout: Killing proof processes!\n");
paulson@17234
   490
			   TextIO.flushOut toParentStr;
paulson@17317
   491
			   killChildren (map cmdchildHandle procList);
paulson@17234
   492
			   ())
paulson@17234
   493
		in 
paulson@17234
   494
		   (*Signal.signal (Posix.Signal.usr2, Signal.SIG_HANDLE killchildHandler);*)
paulson@17306
   495
		   iterations_left := !iterations_left - 1;
paulson@17306
   496
		   if !iterations_left = 0 then killchildHandler ()
paulson@17306
   497
		   else if isSome cmdsFromIsa
paulson@17234
   498
		   then (*  deal with input from Isabelle *)
paulson@17306
   499
		     if getProofCmd(hd(valOf cmdsFromIsa)) = "Kill children" 
paulson@17234
   500
		     then 
paulson@17234
   501
		       let val child_handles = map cmdchildHandle procList 
paulson@17234
   502
		       in
paulson@17234
   503
			  killChildren child_handles;
paulson@17234
   504
			  (*Posix.Process.kill(Posix.Process.K_PROC (Posix.ProcEnv.getppid()), Posix.Signal.usr2);*)    
paulson@17306
   505
			  loop []
paulson@17234
   506
		       end
paulson@17234
   507
		     else
paulson@17306
   508
		       if length procList < 5     (********************)
paulson@17234
   509
		       then                        (* Execute locally  *)
paulson@17234
   510
			 let 
paulson@17234
   511
			   val newProcList = execCmds (valOf cmdsFromIsa) procList
paulson@17234
   512
			   val parentID = Posix.ProcEnv.getppid()
paulson@17484
   513
			      val _ = File.append (File.tmp_path (Path.basic "prekeep_watch"))
paulson@17484
   514
			      "Just execed a child\n"
paulson@17484
   515
			   val newProcList' = checkChildren (newProcList, toParentStr) 
paulson@17234
   516
			 in
paulson@17484
   517
			   File.append (File.tmp_path (Path.basic "keep_watch")) 
paulson@17484
   518
			       "Off to keep watching...\n";
paulson@17306
   519
			   loop newProcList'
paulson@17234
   520
			 end
paulson@17234
   521
		       else  (* Execute remotely              *)
paulson@17234
   522
			     (* (actually not remote for now )*)
paulson@17234
   523
			 let 
paulson@17234
   524
			   val newProcList = execCmds (valOf cmdsFromIsa) procList
paulson@17234
   525
			   val parentID = Posix.ProcEnv.getppid()
paulson@17234
   526
			   val newProcList' =checkChildren (newProcList, toParentStr) 
paulson@17234
   527
			 in
paulson@17306
   528
			   loop newProcList'
paulson@17234
   529
			 end
paulson@17234
   530
		   else (* No new input from Isabelle *)
paulson@17317
   531
		     let val newProcList = checkChildren (procList, toParentStr)
paulson@17234
   532
		     in
paulson@17484
   533
		      (File.append (File.tmp_path (Path.basic "keep_watch")) "Off to keep watching...2\n ");
paulson@17306
   534
		       loop newProcList
paulson@17234
   535
		     end
paulson@17234
   536
		 end
paulson@17234
   537
	   in  
paulson@17306
   538
	       loop procList
paulson@17234
   539
	   end
paulson@17234
   540
	   
quigley@15642
   541
paulson@17234
   542
	   in
paulson@17234
   543
	    (***************************)
paulson@17234
   544
	    (*** Sort out pipes ********)
paulson@17234
   545
	    (***************************)
quigley@15642
   546
paulson@17234
   547
	     Posix.IO.close (#outfd p1);
paulson@17234
   548
	     Posix.IO.close (#infd p2);
paulson@17234
   549
	     Posix.IO.dup2{old = oldchildin, new = fromParent};
paulson@17234
   550
	     Posix.IO.close oldchildin;
paulson@17234
   551
	     Posix.IO.dup2{old = oldchildout, new = toParent};
paulson@17234
   552
	     Posix.IO.close oldchildout;
paulson@17234
   553
paulson@17234
   554
	     (***************************)
paulson@17234
   555
	     (* start the watcher loop  *)
paulson@17234
   556
	     (***************************)
paulson@17234
   557
	     keepWatching (toParentStr, fromParentStr, procList);
paulson@17234
   558
	     (****************************************************************************)
paulson@17234
   559
(* fake return value - actually want the watcher to loop until killed *)
paulson@17234
   560
	     (****************************************************************************)
paulson@17234
   561
	     Posix.Process.wordToPid 0w0
paulson@17234
   562
	   end);
paulson@17234
   563
     (* end case *)
quigley@15642
   564
quigley@15642
   565
paulson@16061
   566
    val _ = TextIO.flushOut TextIO.stdOut
quigley@15642
   567
paulson@16061
   568
    (*******************************)
paulson@16061
   569
    (***  set watcher going ********)
paulson@16061
   570
    (*******************************)
quigley@15642
   571
paulson@16061
   572
    val procList = []
paulson@17317
   573
    val pid = startWatcher procList
paulson@16061
   574
    (**************************************************)
paulson@16061
   575
    (* communication streams to watcher               *)
paulson@16061
   576
    (**************************************************)
quigley@15642
   577
paulson@16061
   578
    val instr = openInFD ("_exec_in", #infd p2)
paulson@16061
   579
    val outstr = openOutFD ("_exec_out", #outfd p1)
paulson@16061
   580
    
paulson@16061
   581
    in
paulson@16061
   582
     (*******************************)
paulson@16061
   583
     (* close the child-side fds    *)
paulson@16061
   584
     (*******************************)
paulson@16061
   585
      Posix.IO.close (#outfd p2);
paulson@16061
   586
      Posix.IO.close (#infd p1);
paulson@16061
   587
      (* set the fds close on exec *)
paulson@16061
   588
      Posix.IO.setfd (#infd p2, Posix.IO.FD.flags [Posix.IO.FD.cloexec]);
paulson@16061
   589
      Posix.IO.setfd (#outfd p1, Posix.IO.FD.flags [Posix.IO.FD.cloexec]);
paulson@16061
   590
       
paulson@16061
   591
     (*******************************)
paulson@16061
   592
     (* return value                *)
paulson@16061
   593
     (*******************************)
paulson@16061
   594
      PROC{pid = pid,
paulson@16061
   595
	instr = instr,
paulson@16061
   596
	outstr = outstr
paulson@16061
   597
      }
paulson@16061
   598
   end;
quigley@15642
   599
quigley@15642
   600
quigley@15642
   601
quigley@15642
   602
(**********************************************************)
quigley@15642
   603
(* Start a watcher and set up signal handlers             *)
quigley@15642
   604
(**********************************************************)
quigley@16039
   605
paulson@17484
   606
fun killWatcher pid = Posix.Process.kill(Posix.Process.K_PROC pid, Posix.Signal.kill);
quigley@16039
   607
paulson@17488
   608
val killWatcher' = killWatcher o ResLib.pidOfInt;
paulson@17488
   609
quigley@16039
   610
fun reapWatcher(pid, instr, outstr) =
paulson@17484
   611
  (TextIO.closeIn instr; TextIO.closeOut outstr;
paulson@17484
   612
   Posix.Process.waitpid(Posix.Process.W_CHILD pid, []); ())
quigley@15642
   613
paulson@17484
   614
fun createWatcher (thm, clause_arr) =
paulson@17484
   615
 let val (childpid,(childin,childout)) = childInfo (setupWatcher(thm,clause_arr))
paulson@17435
   616
     fun decr_watched() =
paulson@17435
   617
	  (goals_being_watched := (!goals_being_watched) - 1;
paulson@17435
   618
	   if !goals_being_watched = 0
paulson@17435
   619
	   then 
paulson@17435
   620
	     (File.append (File.tmp_path (Path.basic "reap_found"))
paulson@17435
   621
	       ("Reaping a watcher, childpid = "^
paulson@17435
   622
		LargeWord.toString (Posix.Process.pidToWord childpid)^"\n");
paulson@17484
   623
	      killWatcher childpid; reapWatcher (childpid,childin, childout))
paulson@17435
   624
	    else ())
paulson@17484
   625
     val _ = debug ("subgoals forked to createWatcher: "^ prems_string_of thm);
paulson@17484
   626
     fun proofHandler n = 
paulson@17484
   627
       let val outcome = TextIO.inputLine childin
paulson@17484
   628
	   val goalstring = TextIO.inputLine childin
paulson@17484
   629
	   val _ = debug ("In signal handler. outcome = \"" ^ outcome ^ 
paulson@17484
   630
		        "\"\ngoalstring = " ^ goalstring ^
paulson@17484
   631
		        "\ngoals_being_watched: "^ string_of_int (!goals_being_watched))
paulson@17216
   632
       in (* if a proof has been found and sent back as a reconstruction proof *)
paulson@17484
   633
	 if String.isPrefix "[" outcome
paulson@17216
   634
	 then (Pretty.writeln(Pretty.str ( (concat[(oct_char "360"), (oct_char "377")])));
paulson@17484
   635
	       Recon_Transfer.apply_res_thm outcome goalstring;
paulson@17216
   636
	       Pretty.writeln(Pretty.str  (oct_char "361"));
paulson@17435
   637
	       decr_watched())
paulson@17484
   638
	 (* if there's no proof, but a message from the signalling process*)
paulson@17484
   639
	 else if String.isPrefix "Invalid" outcome
paulson@17435
   640
	 then (Pretty.writeln(Pretty.str ( (concat[(oct_char "360"), (oct_char "377")])));
paulson@17484
   641
	       Pretty.writeln(Pretty.str ((Recon_Transfer.restore_linebreaks goalstring) 
paulson@17484
   642
	       ^ "is not provable"));
paulson@17484
   643
	       Pretty.writeln(Pretty.str  (oct_char "361"));
paulson@17484
   644
	       decr_watched())
paulson@17484
   645
	 else if String.isPrefix "Failure" outcome
paulson@17484
   646
	 then (Pretty.writeln(Pretty.str ( (concat[(oct_char "360"), (oct_char "377")])));
paulson@17484
   647
	       Pretty.writeln(Pretty.str ((Recon_Transfer.restore_linebreaks goalstring) 
paulson@17484
   648
	       ^ "proof attempt failed"));
paulson@17216
   649
	       Pretty.writeln(Pretty.str  (oct_char "361"));
paulson@17435
   650
	       decr_watched()) 
paulson@17216
   651
	(* print out a list of rules used from clasimpset*)
paulson@17484
   652
	 else if String.isPrefix "Success" outcome
paulson@17435
   653
	 then (Pretty.writeln(Pretty.str ( (concat[(oct_char "360"), (oct_char "377")])));
paulson@17484
   654
	       Pretty.writeln(Pretty.str (goalstring^outcome));
paulson@17216
   655
	       Pretty.writeln(Pretty.str  (oct_char "361"));
paulson@17435
   656
	       decr_watched())
paulson@17216
   657
	  (* if proof translation failed *)
paulson@17484
   658
	 else if String.isPrefix "Translation failed" outcome
paulson@17435
   659
	 then (Pretty.writeln(Pretty.str ( (concat[(oct_char "360"), (oct_char "377")])));
paulson@17484
   660
	       Pretty.writeln(Pretty.str (goalstring^(Recon_Transfer.restore_linebreaks outcome)));
paulson@17216
   661
	       Pretty.writeln(Pretty.str  (oct_char "361"));
paulson@17435
   662
	       decr_watched())
paulson@17484
   663
	 else  
paulson@17435
   664
	      (Pretty.writeln(Pretty.str ( (concat[(oct_char "360"), (oct_char "377")])));
paulson@17484
   665
	       Pretty.writeln(Pretty.str ("System error in proof handler"));
paulson@17231
   666
	       Pretty.writeln(Pretty.str  (oct_char "361"));
paulson@17435
   667
	       decr_watched())
paulson@17484
   668
       end
paulson@17484
   669
 in IsaSignal.signal (IsaSignal.usr2, IsaSignal.SIG_HANDLE proofHandler);
paulson@17216
   670
    (childin, childout, childpid)
paulson@17216
   671
  end
quigley@15642
   672
quigley@15642
   673
end (* structure Watcher *)