--- loncom/lonnet/perl/lonnet.pm	2001/01/05 20:06:07	1.86
+++ loncom/lonnet/perl/lonnet.pm	2001/01/05 20:45:09	1.87
@@ -82,6 +82,8 @@
 # 10/30,10/31,
 # 11/2,11/14,11/15,11/16,11/20,11/21,11/22,11/25,11/27,
 # 12/02,12/12,12/13,12/14,12/28,12/29 Gerd Kortemeyer
+# 05/01/01 Guy Albertelli
+# 05/01 Gerd Kortemeyer
 
 package Apache::lonnet;
 
@@ -289,9 +291,11 @@ sub delenv {
      unless ($fh=Apache::File->new(">$ENV{'user.environment'}")) {
 	return 'error';
      }
+     flock($fh,'LOCK_EX');
      map {
 	 unless ($_=~/^$delthis/) { print $fh $_; }
      } @oldenv;
+     $fh->close();
     }
     return 'ok';
 }