add process registration (Cacti#5457)

* add process registration

* update

Author: xmacan

CHANGELOG

@@ -71,6 +71,7 @@ Cacti CHANGELOG
 -issue#5452: The default 'bulk_walk_size' is -1 which means a device will never find it's optimal bulk walk size
 -issue#5453: Templates without copyright, cleaning SNMP printer package
 -issue#5454: Cacti Orphan Graphs Selector missing column 'orphan' in SQL selector
+-issue#5457: Enable 'Re-Index All Device Schedule' causes a lot of reindex processes  
 -feature#5375: Add template for Fortinet firewall and Aruba Instant cluster
 -feature#5393: Add template for SNMP printer
 -feature#5418: Display device class before package import

cli/poller_reindex_hosts.php

@@ -152,6 +152,17 @@
 print 'WARNING: Do not interrupt this script.  Reindexing can take quite some time' . PHP_EOL;
 debug("There are '" . cacti_sizeof($data_queries) . "' data queries to run");
 
+
+/* silently end if the registered process is still running  */
+if (!$force) {
+        if (!register_process_start('reindex', 'master', 0, 86400)) {
+		print "FATAL: Detected an already running process.  Use --force to override" . PHP_EOL;
+                exit(0);
+        }
+}
+
+
+
 $i = 1;
 $total_start = microtime(true);
 if (cacti_sizeof($data_queries)) {
@@ -195,6 +206,9 @@
 
 		$i++;
 	}
+
+	unregister_process('reindex', 'master');
+
 }
 
 function display_version() {