From 1cb43fbcde455575e69d2b8a5e6acdc1230f0a05 Mon Sep 17 00:00:00 2001
From: Jan Huwald <jh@sotun.de>
Date: Mon, 27 Jan 2014 23:47:51 +0100
Subject: change lock mode during update operation to exclusive

Change shared table lock to exclusive lock when updating the table.

This fixes a race condition the could cause loss of data under
parallel update operations.

diff --git a/p2ptbl b/p2ptbl
index 341cecd..fee7690 100755
--- a/p2ptbl
+++ b/p2ptbl
@@ -140,7 +140,7 @@ case "$1" in
 	filter "$tbl" "$@"
 	;;
     update)
-	lockTable -s "$2"
+	lockTable -x "$2"
 	update "$2" "$3" "$4" "$5"
 	;;
     merge)
@@ -155,4 +155,4 @@ case "$1" in
     *) 
 	printArgs
 	;;
-esac
\ No newline at end of file
+esac
-- 
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