--- rat/lonuserstate.pm	2004/10/26 15:15:20	1.80
+++ rat/lonuserstate.pm	2005/07/14 21:30:24	1.94
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Construct and maintain state and binary representation of course for user
 #
-# $Id: lonuserstate.pm,v 1.80 2004/10/26 15:15:20 albertel Exp $
+# $Id: lonuserstate.pm,v 1.94 2005/07/14 21:30:24 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -32,9 +32,8 @@ package Apache::lonuserstate;
 # ------------------------------------------------- modules used by this module
 use strict;
 use Apache::Constants qw(:common :http);
-use Apache::File;
 use HTML::TokeParser;
-use Apache::lonnet();
+use Apache::lonnet;
 use Apache::loncommon();
 use GDBM_File;
 use Apache::lonmsg;
@@ -74,6 +73,7 @@ sub versiontrack {
 
 sub putinversion {
     my $uri=shift;
+    my $key=$env{'request.course.id'}.'_'.&Apache::lonnet::clutter($uri);
     if ($hash{'version_'.$uri}) {
 	my $version=$hash{'version_'.$uri};
 	if ($version eq 'mostrecent') { return $uri; }
@@ -82,6 +82,7 @@ sub putinversion {
 	             { return $uri; }
 	$uri=~s/\.(\w+)$/\.$version\.$1/;
     }
+    &Apache::lonnet::do_cache_new('courseresversion',$key,&Apache::lonnet::declutter($uri),600);
     return $uri;
 }
 
@@ -116,8 +117,8 @@ sub loadmap {
 
     unless (($fn=~/\.sequence$/) ||
             ($fn=~/\.page$/)) { 
-       $errtext.="Invalid map: $fn\n";
-       return OK; 
+	$errtext.="Invalid map: $fn\n";
+	return OK; 
     }
 
     my $instr=&Apache::lonnet::getfile($fn);
@@ -127,6 +128,7 @@ sub loadmap {
 # Successfully got file, parse it
 
         my $parser = HTML::TokeParser->new(\$instr);
+	#$parser->attr_encoded(1);
         my $token;
 
         my $linkpc=0;
@@ -139,7 +141,7 @@ sub loadmap {
 	    if ($token->[0] eq 'S') {
                 if ($token->[1] eq 'resource') {
 # -------------------------------------------------------------------- Resource
-
+                    if ($token->[2]->{'type'} eq 'zombie') { next; }
                     my $rid=$lpc.'.'.$token->[2]->{'id'};
 
                     $hash{'kind_'.$rid}='res';
@@ -150,10 +152,12 @@ sub loadmap {
 			    $hash{'version_'.$turi}=$1;
 			}
 		    }
-		    &Apache::lonnet::do_cache(\%Apache::lonnet::titlecache,
-		       &Apache::lonnet::encode_symb($uri,$token->[2]->{'id'},
-						    $turi),
-					      $token->[2]->{'title'},'title');
+		    my $title=$token->[2]->{'title'};
+		    $title=~s/\&colon\;/\:/gs;
+#		    my $symb=&Apache::lonnet::encode_symb($uri,
+#							  $token->[2]->{'id'},
+#							  $turi);
+#		    &Apache::lonnet::do_cache_new('title',$symb,$title);
                     unless ($ispage) {
                         $turi=~/\.(\w+)$/;
                         my $embstyle=&Apache::loncommon::fileembstyle($1);
@@ -185,8 +189,7 @@ sub loadmap {
                         $hash{'ids_'.$idsuri}=''.$rid;
                     }
                
-                    if
-	        ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard)$/) {
+                    if ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard)$/) {
 			$turi.='?register=1';
 		    }
 
@@ -298,87 +301,95 @@ sub loadmap {
 			}
                     }
                 } 
-
+		
             }
         }
 
     } else {
-        $errtext.='Map not loaded: The file does not exist. ';
+        $errtext.='Map not loaded: The file ('.$fn.') does not exist. ';
     }
 }
 
 # --------------------------------------------------------- Simplify expression
 
 sub simplify {
-   my $expression=shift;
+    my $expression=shift;
 # (8)=8
-   $expression=~s/\((\d+)\)/$1/g;
+    $expression=~s/\((\d+)\)/$1/g;
 # 8&8=8
-   $expression=~s/(\D)(\d+)\&\2(\D)/$1$2$3/g;
+    $expression=~s/(\D)(\d+)\&\2(\D)/$1$2$3/g;
 # 8|8=8
-   $expression=~s/(\D)(\d+)\|\2(\D)/$1$2$3/g;
+    $expression=~s/(\D)(\d+)\|\2(\D)/$1$2$3/g;
 # (5&3)&4=5&3&4
-   $expression=~s/\((\d+)((?:\&\d+)+)\)\&(\d+\D)/$1$2\&$3/g;
+    $expression=~s/\((\d+)((?:\&\d+)+)\)\&(\d+\D)/$1$2\&$3/g;
 # (((5&3)|(4&6)))=((5&3)|(4&6))
-   $expression=~
-       s/\((\(\(\d+(?:\&\d+)*\)(?:\|\(\d+(?:\&\d+)*\))+\))\)/$1/g;
+    $expression=~
+	s/\((\(\(\d+(?:\&\d+)*\)(?:\|\(\d+(?:\&\d+)*\))+\))\)/$1/g;
 # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
-   $expression=~
-       s/\((\(\d+(?:\&\d+)*\))((?:\|\(\d+(?:\&\d+)*\))+)\)\|(\(\d+(?:\&\d+)*\))/\($1$2\|$3\)/g;
-   return $expression;
+    $expression=~
+	s/\((\(\d+(?:\&\d+)*\))((?:\|\(\d+(?:\&\d+)*\))+)\)\|(\(\d+(?:\&\d+)*\))/\($1$2\|$3\)/g;
+    return $expression;
 }
 
 # -------------------------------------------------------- Build condition hash
 
 sub traceroute {
     my ($sofar,$rid,$beenhere,$encflag,$hdnflag)=@_;
-    $sofar=simplify($sofar);
+    my $newsofar=$sofar=simplify($sofar);
     unless ($beenhere=~/\&$rid\&/) {
-       $beenhere.=$rid.'&';  
-       my ($mapid,$resid)=split(/\./,$rid);
-       my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid});
-       my $encrypt=&Apache::lonnet::EXT('resource.0.hiddenresource',$symb);
-       if ($hdnflag || lc($encrypt) eq 'yes') { $hiddenurl{$rid}=1; }
-       my $encrypt=&Apache::lonnet::EXT('resource.0.encrypturl',$symb);
-       if ($encflag || lc($encrypt) eq 'yes') { $encurl{$rid}=1; }
-       if (($retfurl eq '') && ($hash{'src_'.$rid})
-	   && ($hash{'src_'.$rid}!~/\.sequence$/)) {
-           $retfurl=$hash{'src_'.$rid}.(($hash{'src_'.$rid}=~/\?/)?'&':'?').
-	       'symb='.$symb;
-       }
-       if (defined($hash{'conditions_'.$rid})) {
-	   $hash{'conditions_'.$rid}=simplify(
+	$beenhere.=$rid.'&';  
+	my ($mapid,$resid)=split(/\./,$rid);
+	my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid});
+	my $hidden=&Apache::lonnet::EXT('resource.0.hiddenresource',$symb);
+
+	if ($hdnflag || lc($hidden) eq 'yes') {
+	    $hiddenurl{$rid}=1;
+	}
+	if (!$hdnflag && lc($hidden) eq 'no') {
+	    delete($hiddenurl{$rid});
+	}
+
+	my $encrypt=&Apache::lonnet::EXT('resource.0.encrypturl',$symb);
+	if ($encflag || lc($encrypt) eq 'yes') { $encurl{$rid}=1; }
+	if (($retfurl eq '') && ($hash{'src_'.$rid})
+	    && ($hash{'src_'.$rid}!~/\.sequence$/)) {
+	    $retfurl=$hash{'src_'.$rid}.(($hash{'src_'.$rid}=~/\?/)?'&':'?').
+		'symb='.$symb;
+	}
+	if (defined($hash{'conditions_'.$rid})) {
+	    $hash{'conditions_'.$rid}=simplify(
            '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
-       } else {
-           $hash{'conditions_'.$rid}=$sofar;
-       }
-       if (defined($hash{'is_map_'.$rid})) {
-           if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
-	       &traceroute($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},'&',
-			   $encflag || $encurl{$rid},
-			   $hdnflag || $hiddenurl{$rid});
-               if (defined($hash{'map_finish_'.$hash{'src_'.$rid}})) {
-		   $sofar=
-                  $hash{'conditions_'.$hash{'map_finish_'.$hash{'src_'.$rid}}};
-               }
-           }
-       }
-       if (defined($hash{'to_'.$rid})) {
-          foreach (split(/\,/,$hash{'to_'.$rid})) {
+	} else {
+	    $hash{'conditions_'.$rid}=$sofar;
+	}
+	$newsofar=$hash{'conditions_'.$rid};
+	if (defined($hash{'is_map_'.$rid})) {
+	    if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
+		$sofar=$newsofar=
+		    &traceroute($sofar,
+				$hash{'map_start_'.$hash{'src_'.$rid}},'&',
+				$encflag || $encurl{$rid},
+				$hdnflag || $hiddenurl{$rid});
+	    }
+	}
+	if (defined($hash{'to_'.$rid})) {
+	    foreach (split(/\,/,$hash{'to_'.$rid})) {
 		my $further=$sofar;
                 if ($hash{'undercond_'.$_}) {
-		   if (defined($hash{'condid_'.$hash{'undercond_'.$_}})) {
-  		       $further=simplify('('.$further.')&('.
-                              $hash{'condid_'.$hash{'undercond_'.$_}}.')');
-		   } else {
-                       $errtext.='Undefined condition ID: '
-                                 .$hash{'undercond_'.$_}.'. ';
-                   }
+		    if (defined($hash{'condid_'.$hash{'undercond_'.$_}})) {
+			$further=simplify('('.$further.')&('.
+					  $hash{'condid_'.$hash{'undercond_'.$_}}.')');
+		    } else {
+			$errtext.='Undefined condition ID: '
+			    .$hash{'undercond_'.$_}.'. ';
+		    }
                 }
-                &traceroute($further,$hash{'goesto_'.$_},$beenhere,$encflag,$hdnflag);
-          }
-       }
+                $newsofar=&traceroute($further,$hash{'goesto_'.$_},$beenhere,
+				      $encflag,$hdnflag);
+	    }
+	}
     }
+    return $newsofar;
 }
 
 # ------------------------------ Cascading conditions, quick access, parameters
@@ -390,74 +401,74 @@ sub accinit {
     my $condcounter=0;
     $acchash{'acc.cond.'.$short.'.0'}=0;
     foreach (keys %hash) {
-       if ($_=~/^conditions/) {
-	  my $expr=$hash{$_};
-         foreach ($expr=~m/(\(\(\d+(?:\&\d+)+\)(?:\|\(\d+(?:\&\d+)+\))+\))/g) {
-             my $sub=$_;
-             my $orig=$_;
-      $sub=~/\(\((\d+\&(:?\d+\&)*)(?:\d+\&*)+\)(?:\|\(\1(?:\d+\&*)+\))+\)/;
-             my $factor=$1;
-             $sub=~s/$factor//g;
-             $sub=~s/^\(/\($factor\(/;
-	     $sub.=')';
-             $sub=simplify($sub);
-             $orig=~s/(\W)/\\$1/g;
- 	     $expr=~s/$orig/$sub/;
-	  }
-          $hash{$_}=$expr;
-          unless (defined($captured{$expr})) {
-	      $condcounter++;
-              $captured{$expr}=$condcounter;
-              $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
-          } 
-       } elsif ($_=~/^param_(\d+)\.(\d+)/) {
-          my $prefix=&Apache::lonnet::declutter($hash{'map_id_'.$1}).
-      '___'.$2.'___'.&Apache::lonnet::declutter($hash{'src_'.$1.'.'.$2});
-          foreach (split(/\&/,$hash{$_})) {
-	     my ($typename,$value)=split(/\=/,$_);
-             my ($type,$name)=split(/\:/,$typename);
-             $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name)}=
-                                   &Apache::lonnet::unescape($value);
-	     $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name).'.type'}=
-                                   &Apache::lonnet::unescape($type);
-          }
-       }
+	if ($_=~/^conditions/) {
+	    my $expr=$hash{$_};
+	    foreach ($expr=~m/(\(\(\d+(?:\&\d+)+\)(?:\|\(\d+(?:\&\d+)+\))+\))/g) {
+		my $sub=$_;
+		my $orig=$_;
+		$sub=~/\(\((\d+\&(:?\d+\&)*)(?:\d+\&*)+\)(?:\|\(\1(?:\d+\&*)+\))+\)/;
+		my $factor=$1;
+		$sub=~s/$factor//g;
+		$sub=~s/^\(/\($factor\(/;
+		$sub.=')';
+		$sub=simplify($sub);
+		$orig=~s/(\W)/\\$1/g;
+		$expr=~s/$orig/$sub/;
+	    }
+	    $hash{$_}=$expr;
+	    unless (defined($captured{$expr})) {
+		$condcounter++;
+		$captured{$expr}=$condcounter;
+		$acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
+	    } 
+	} elsif ($_=~/^param_(\d+)\.(\d+)/) {
+	    my $prefix=&Apache::lonnet::encode_symb($hash{'map_id_'.$1},$2,
+						    $hash{'src_'.$1.'.'.$2});
+	    foreach (split(/\&/,$hash{$_})) {
+		my ($typename,$value)=split(/\=/,$_);
+		my ($type,$name)=split(/\:/,$typename);
+		$parmhash{$prefix.'.'.&Apache::lonnet::unescape($name)}=
+		    &Apache::lonnet::unescape($value);
+		$parmhash{$prefix.'.'.&Apache::lonnet::unescape($name).'.type'}=
+		    &Apache::lonnet::unescape($type);
+	    }
+	}
     }
     foreach (keys %hash) {
 	if ($_=~/^ids/) {
-	  foreach (split(/\,/,$hash{$_})) {
-	    my $resid=$_;
-            my $uri=$hash{'src_'.$resid};
-            $uri=~s/^\/adm\/wrapper//;
-            $uri=&Apache::lonnet::declutter($uri);
-            my @uriparts=split(/\//,$uri);
-            my $urifile=$uriparts[$#uriparts];
-            $#uriparts--;
-            my $uripath=join('/',@uriparts);
-           if ($uripath) {
-            my $uricond='0';
-            if (defined($hash{'conditions_'.$resid})) {
- 		$uricond=$captured{$hash{'conditions_'.$resid}};
-            }
-            if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
-                if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
-                   /(\&\Q$urifile\E\:[^\&]*)/) {
-		    my $replace=$1;
-                    my $regexp=$replace;
-                    #$regexp=~s/\|/\\\|/g;
-                    $acchash{'acc.res.'.$short.'.'.$uripath}
-                     =~s/\Q$regexp\E/$replace\|$uricond/;
-                } else {
-		   $acchash{'acc.res.'.$short.'.'.$uripath}.=
-                     $urifile.':'.$uricond.'&';
-	        }
-            } else {
-                $acchash{'acc.res.'.$short.'.'.$uripath}=
-                 '&'.$urifile.':'.$uricond.'&';
-            }
-           } 
-         }
-      }
+	    foreach (split(/\,/,$hash{$_})) {
+		my $resid=$_;
+		my $uri=$hash{'src_'.$resid};
+		$uri=~s/^\/adm\/wrapper//;
+		$uri=&Apache::lonnet::declutter($uri);
+		my @uriparts=split(/\//,$uri);
+		my $urifile=$uriparts[$#uriparts];
+		$#uriparts--;
+		my $uripath=join('/',@uriparts);
+		if ($uripath) {
+		    my $uricond='0';
+		    if (defined($hash{'conditions_'.$resid})) {
+			$uricond=$captured{$hash{'conditions_'.$resid}};
+		    }
+		    if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
+			if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
+			    /(\&\Q$urifile\E\:[^\&]*)/) {
+			    my $replace=$1;
+			    my $regexp=$replace;
+			    #$regexp=~s/\|/\\\|/g;
+			    $acchash{'acc.res.'.$short.'.'.$uripath}
+			    =~s/\Q$regexp\E/$replace\|$uricond/;
+			} else {
+			    $acchash{'acc.res.'.$short.'.'.$uripath}.=
+				$urifile.':'.$uricond.'&';
+			}
+		    } else {
+			$acchash{'acc.res.'.$short.'.'.$uripath}=
+			    '&'.$urifile.':'.$uricond.'&';
+		    }
+		} 
+	    }
+	}
     }
     $acchash{'acc.res.'.$short.'.'}='&:0&';
     my $courseuri=$uri;
@@ -502,11 +513,10 @@ sub hiddenurls {
 		$hash{'randomout_'.$currentrids[$k]}=1;
                 my ($mapid,$resid)=split(/\./,$currentrids[$k]);
                 $randomoutentry.='&'.
-                 &Apache::lonnet::symbclean(
-		    &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
-                    '___'.$resid.'___'.
-		    &Apache::lonnet::declutter($hash{'src_'.$currentrids[$k]})
-                 ).'&';
+		    &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
+						 $resid,
+						 $hash{'src_'.$currentrids[$k]}
+						 ).'&';
             }
         }
     }
@@ -515,11 +525,8 @@ sub hiddenurls {
 	$hash{'randomout_'.$rid}=1;
 	my ($mapid,$resid)=split(/\./,$rid);
 	$randomoutentry.='&'.
-	    &Apache::lonnet::symbclean(
-		         &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
-				       '___'.$resid.'___'.
-		    &Apache::lonnet::declutter($hash{'src_'.$rid})
-				       ).'&';
+	    &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,
+					 $hash{'src_'.$rid}).'&';
     }
 # --------------------------------------- append randomout entry to environment
     if ($randomoutentry) {
@@ -530,94 +537,121 @@ sub hiddenurls {
 # ---------------------------------------------------- Read map and all submaps
 
 sub readmap {
-   my $short=shift;
-   $short=~s/^\///;
-   my %cenv=&Apache::lonnet::coursedescription($short);
-   my $fn=$cenv{'fn'};
-   my $uri;
-   $short=~s/\//\_/g;
-   unless ($uri=$cenv{'url'}) { 
-      &Apache::lonnet::logthis("<font color=blue>WARNING: ".
-                       "Could not load course $short.</font>"); 
-      return 'No course data available.';
-   }
-   @cond=('true:normal');
-   unlink($fn.'.db');
-   unlink($fn.'_symb.db');
-   unlink($fn.'.state');
-   unlink($fn.'parms.db');
-   undef %randompick;
-   undef %hiddenurl;
-   undef %encurl;
-   $retfurl='';
-   if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) &&
-       (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) {
-    %hash=();
-    %parmhash=();
-    $errtext='';
-    $pc=0;
-    &processversionfile(%cenv);
-    my $furi=&Apache::lonnet::clutter($uri);
-    $hash{'src_0.0'}=&versiontrack($furi);
-    $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
-    $hash{'ids_'.$furi}='0.0';
-    $hash{'is_map_0.0'}=1;
-    loadmap($uri);
-    if (defined($hash{'map_start_'.$uri})) {
-	&Apache::lonnet::appenv("request.course.id"  => $short,
-				"request.course.fn"  => $fn,
-				"request.course.uri" => $uri);
-        &traceroute('0',$hash{'map_start_'.$uri},'&');
-        &accinit($uri,$short,$fn);
-        &hiddenurls();
-    }
+    my $short=shift;
+    $short=~s/^\///;
+    my %cenv=&Apache::lonnet::coursedescription($short);
+    my $fn=$cenv{'fn'};
+    my $uri;
+    $short=~s/\//\_/g;
+    unless ($uri=$cenv{'url'}) { 
+	&Apache::lonnet::logthis("<font color=blue>WARNING: ".
+				 "Could not load course $short.</font>"); 
+	return 'No course data available.';
+    }
+    @cond=('true:normal');
+    #unlink($fn.'.db');
+    #unlink($fn.'_symb.db');
+    unlink($fn.'.state');
+    unlink($fn.'parms.db');
+    undef %randompick;
+    undef %hiddenurl;
+    undef %encurl;
+    $retfurl='';
+    if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) &&
+	(tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) {
+	%hash=();
+	%parmhash=();
+	$errtext='';
+	$pc=0;
+	&processversionfile(%cenv);
+	my $furi=&Apache::lonnet::clutter($uri);
+	$hash{'src_0.0'}=&versiontrack($furi);
+	$hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
+	$hash{'ids_'.$furi}='0.0';
+	$hash{'is_map_0.0'}=1;
+	loadmap($uri);
+	if (defined($hash{'map_start_'.$uri})) {
+	    &Apache::lonnet::appenv("request.course.id"  => $short,
+				    "request.course.fn"  => $fn,
+				    "request.course.uri" => $uri);
+	    &traceroute('0',$hash{'map_start_'.$uri},'&');
+	    &accinit($uri,$short,$fn);
+	    &hiddenurls();
+	}
 # ------------------------------------------------------- Put versions into src
-    foreach (keys %hash) {
-	if ($_=~/^src\_/) {
-	    $hash{$_}=&putinversion($hash{$_});
+	foreach (keys %hash) {
+	    if ($_=~/^src\_/) {
+		$hash{$_}=&putinversion($hash{$_});
+	    }
 	}
-    }
 # ---------------------------------------------------------------- Encrypt URLs
-    foreach (keys %encurl) {
-	$hash{'src_'.$_}=&Apache::lonenc::encrypted($hash{'src_'.$_});
-    }
+	foreach (keys %encurl) {
+#	    $hash{'src_'.$_}=&Apache::lonenc::encrypted($hash{'src_'.$_});
+	    $hash{'encrypted_'.$_}=1;
+	}
 # ----------------------------------------------- Close hashes to finally store
 # --------------------------------- Routine must pass this point, no early outs
-    unless ((untie(%hash)) && (untie(%parmhash))) {
-      &Apache::lonnet::logthis("<font color=blue>WARNING: ".
-                       "Could not untie coursemap $fn for $uri.</font>"); 
-    }
+	$hash{'first_url'}=$retfurl;
+	unless ((untie(%hash)) && (untie(%parmhash))) {
+	    &Apache::lonnet::logthis("<font color=blue>WARNING: ".
+				     "Could not untie coursemap $fn for $uri.</font>"); 
+	}
 # ---------------------------------------------------- Store away initial state
-    {
-     my $cfh;
-     if ($cfh=Apache::File->new(">$fn.state")) {
-        print $cfh join("\n",@cond);
-     } else {
-      &Apache::lonnet::logthis("<font color=blue>WARNING: ".
-                       "Could not write statemap $fn for $uri.</font>"); 
-     }
-    }  
-   } else {
-      &Apache::lonnet::logthis("<font color=blue>WARNING: ".
-                       "Could not tie coursemap $fn for $uri.</font>"); 
-   }
-   &Apache::lonmsg::author_res_msg($ENV{'request.course.uri'},$errtext);
+	{
+	    my $cfh;
+	    if (open($cfh,">$fn.state")) {
+		print $cfh join("\n",@cond);
+	    } else {
+		&Apache::lonnet::logthis("<font color=blue>WARNING: ".
+					 "Could not write statemap $fn for $uri.</font>"); 
+	    }
+	}  
+    } else {
+	# if we are here it is likely because we are already trying to 
+	# initialize the course in another child, busy wait trying to 
+	# tie the hashes for the next 90 seconds, if we succeed forward 
+	# them on to navmaps, if we fail, throw up the Could not init 
+	# course screen
+	untie(%hash);
+	untie(%parmhash);
+	&Apache::lonnet::logthis("<font color=blue>WARNING: ".
+				 "Could not tie coursemap $fn for $uri.</font>"); 
+	my $i=0;
+	while($i<90) {
+	    $i++;
+	    sleep(1);
+	    if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640))) {
+		if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_READER(),0640)) {
+		    $retfurl='/adm/navmaps';
+		    &Apache::lonnet::appenv("request.course.id"  => $short,
+					    "request.course.fn"  => $fn,
+					    "request.course.uri" => $uri);
+		    untie(%hash);
+		    untie(%parmhash);
+		    last;
+		}
+	    }
+	    untie(%hash);
+	    untie(%parmhash);
+	}
+    }
+    &Apache::lonmsg::author_res_msg($env{'request.course.uri'},$errtext);
 # ------------------------------------------------- Check for critical messages
 
-    my @what=&Apache::lonnet::dump('critical',$ENV{'user.domain'},
-                                              $ENV{'user.name'});
+    my @what=&Apache::lonnet::dump('critical',$env{'user.domain'},
+				   $env{'user.name'});
     if ($what[0]) {
 	if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
 	    $retfurl='/adm/email?critical=display';
         }
     }
-   return ($retfurl,$errtext);
+    return ($retfurl,$errtext);
 }
 
 # ------------------------------------------------------- Evaluate state string
 
 sub evalstate {
-    my $fn=$ENV{'request.course.fn'}.'.state';
+    my $fn=$env{'request.course.fn'}.'.state';
     my $state='';
     if (-e $fn) {
 	my @conditions=();
@@ -649,7 +683,7 @@ sub evalstate {
 	    }
 	}
     }
-    &Apache::lonnet::appenv('user.state.'.$ENV{'request.course.id'} => $state);
+    &Apache::lonnet::appenv('user.state.'.$env{'request.course.id'} => $state);
     return $state;
 }