X-Git-Url: http://gb7djk.dxcluster.net/gitweb/gitweb.cgi?a=blobdiff_plain;f=perl%2Fcluster.pl;h=5e4dd4d9efcc92880361e07a55bba4298c78a249;hb=a3fd9341b7ce57dcc058b82cfba3f40f15631241;hp=fa793f22365ebd6dc66fd8044026d81e57088f68;hpb=5d197c9f7aa2ea796d86aa5473f93956b24cf1b7;p=spider.git

diff --git a/perl/cluster.pl b/perl/cluster.pl
index fa793f22..5e4dd4d9 100755
--- a/perl/cluster.pl
+++ b/perl/cluster.pl
@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/perl -w
 #
 # This is the DX cluster 'daemon'. It sits in the middle of its little
 # web of client routines sucking and blowing data where it may.
@@ -21,8 +21,19 @@ BEGIN {
 	unshift @INC, "$root/perl";	# this IS the right way round!
 	unshift @INC, "$root/local";
 
-#	require Exporter;
-#	$Exporter::Verbose = 1;
+	# try to create and lock a lockfile (this isn't atomic but 
+	# should do for now
+	$lockfn = "$root/perl/cluster.lock";       # lock file name
+	if (-e $lockfn) {
+		open(CLLOCK, "$lockfn") or die "Can't open Lockfile ($lockfn) $!";
+		my $pid = <CLLOCK>;
+		chomp $pid;
+		die "Lockfile ($lockfn) and process $pid exist, another cluster running?" if kill 0, $pid;
+		close CLLOCK;
+	}
+	open(CLLOCK, ">$lockfn") or die "Can't open Lockfile ($lockfn) $!";
+	print CLLOCK "$$\n";
+	close CLLOCK;
 }
 
 use Msg;
@@ -45,6 +56,7 @@ use Bands;
 use Geomag;
 use CmdAlias;
 use Local;
+use Fcntl ':flock'; 
 
 use Carp;
 
@@ -52,9 +64,10 @@ package main;
 
 @inqueue = ();					# the main input queue, an array of hashes
 $systime = 0;					# the time now (in seconds)
-$version = "1.17";				# the version no of the software
+$version = "1.23";				# the version no of the software
 $starttime = 0;                 # the starting time of the cluster   
- 
+$lockfn = "cluster.lock";       # lock file name
+      
 # handle disconnections
 sub disconnect
 {
@@ -153,6 +166,7 @@ sub cease
 		disconnect($dxchan) unless $dxchan == $DXProt::me;
 	}
 	Log('cluster', "DXSpider V$version stopped");
+	unlink $lockfn;
 	exit(0);
 }
 
@@ -278,14 +292,12 @@ print "reading cron jobs ...\n";
 DXCron->init();
 
 # starting local stuff
-print "doing local initialisation ...\n"
+print "doing local initialisation ...\n";
 eval {
 	Local::init();
 };
 dbg('local', "Local::init error $@") if $@;
 
-
-
 # print various flags
 #print "useful info - \$^D: $^D \$^W: $^W \$^S: $^S \$^P: $^P\n";