lock() {

	if ! mkdir "$1" &>/dev/null;  then
		while true; do
			sleep 2;
			if [[ ! -d "$1" ]]; then
				return
			fi
		done
	fi;

}

if [[ "$#" -eq "1" ]]; then
	lock $1
else
	echo "please supply one argument: the lock folder"
	exit 1
fi