]>
git.ipfire.org Git - people/stevee/network.git/blob - functions.lock
2 ###############################################################################
4 # IPFire.org - A linux based firewall #
5 # Copyright (C) 2012 Michael Tremer & Christian Schmidt #
7 # This program is free software: you can redistribute it and/or modify #
8 # it under the terms of the GNU General Public License as published by #
9 # the Free Software Foundation, either version 3 of the License, or #
10 # (at your option) any later version. #
12 # This program is distributed in the hope that it will be useful, #
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of #
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
15 # GNU General Public License for more details. #
17 # You should have received a copy of the GNU General Public License #
18 # along with this program. If not, see <http://www.gnu.org/licenses/>. #
20 ###############################################################################
22 function lock_acquire
() {
26 # timeout value in seconds
28 timeout
=$
(( ${timeout} * 10 ))
30 log DEBUG
"Acquiring lock '${lockfile}'."
33 while [ ${timeout} -gt 0 ]; do
34 if [ ! -e "${lockfile}" ]; then
39 timeout
=$
(( ${timeout} - 1 ))
43 assert
${free} "Could not acquire lock '${lockfile}'."
45 # Write out pid to the lockfile and make sure that
46 # nobody else can access it.
47 echo "$$" > ${lockfile}
51 function lock_release
() {
54 log DEBUG
"Releasing lock '${lockfile}'."
56 # Remove the lockfile (okay if it does not exist).