--- loncom/auth/loncacc.pm	2000/12/26 19:50:25	1.13
+++ loncom/auth/loncacc.pm	2001/01/06 16:12:24	1.14
@@ -2,7 +2,7 @@
 # Cookie Based Access Handler for Construction Area
 # (lonacc: 5/21/99,5/22,5/29,5/31 Gerd Kortemeyer)
 # 6/15,16/11,22/11,
-# 01/06,01/11,6/1,9/25,9/28,11/22,12/25,12/26 Gerd Kortemeyer
+# 01/06,01/11,6/1,9/25,9/28,11/22,12/25,12/26,06/01 Gerd Kortemeyer
 
 package Apache::loncacc;
 
@@ -10,6 +10,7 @@ use strict;
 use Apache::Constants qw(:common :http :methods);
 use Apache::File;
 use CGI::Cookie();
+use Fcntl qw(:flock);
 
 sub handler {
     my $r = shift;
@@ -36,7 +37,9 @@ sub handler {
             my @profile;
 	    {
              my $idf=Apache::File->new("$lonidsdir/$handle.id");
+             flock($idf,LOCK_SH);
              @profile=<$idf>;
+             $idf->close();
 	    }
             my $envi;
             for ($envi=0;$envi<=$#profile;$envi++) {