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# no arg
Lock()
{
	for time in 0.3 0.7 1.1 1.7 2.3 3.1 4.1 0
	do
		if [ -e "$LOCK_FILE" ]; then
			sleep $time
		else
			touch "$LOCK_FILE"
			return 0
		fi
	done
	while :
	do
		if [ -e "$LOCK_FILE" ]; then
			sleep 5.3
		else
			touch "$LOCK_FILE"
			return 0
		fi
	done
}

# no arg
UnLock()
{
	rm "$LOCK_FILE"
}