--- loncom/lonsql	2000/07/02 04:01:56	1.3
+++ loncom/lonsql	2000/07/25 16:06:57	1.4
@@ -1,5 +1,6 @@
 #!/usr/bin/perl
 # lonsql-based on the preforker:harsha jagasia:date:5/10/00
+# 7/25 Gerd Kortemeyer
 
 use IO::Socket;
 use Symbol;
@@ -27,6 +28,17 @@ while ($configline=<CONFIG>) {
 }
 close(CONFIG);
 
+# --------------------------------------------- Check if other instance running
+
+my $pidfile="$perlvar{'lonDaemons'}/logs/lonsql.pid";
+
+if (-e $pidfile) {
+   my $lfh=IO::File->new("$pidfile");
+   my $pide=<$lfh>;
+   chomp($pide);
+   if (kill 0 => $pide) { die "already running"; }
+}
+
 # ------------------------------------------------------------- Read hosts file
 $PREFORK=4; # number of children to maintain, at least four spare