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#!/bin/bash
# Copyright (c) International Business Machines Corp., 2008
# Author: Matt Helsley <matthltc@us.ibm.com>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
#
# This bash script tests freezer code by starting a long subshell process.
# The subshell process sleeps and then freezes the control group it is a
# part of. We then thaw the subshell process. We expect the unthawed subshell
# process to need cleanup afterwards (allows us to test successful thawing).
#
. "${CGROUPS_TESTROOT}/libcgroup_freezer"
SETS_DEFAULTS="${TCID=freeze_self_thaw.sh} ${TST_COUNT=1} ${TST_TOTAL=1}"
declare -r TCID
declare -r TST_COUNT
declare -r TST_TOTAL
export TCID TST_COUNT TST_TOTAL
# We replace the normal sample process with a process which sleeps, issues
# the freeze command, and then sleeps some more. Little does it know that it
# will be freezing the cgroup it's been assigned to.
function sleep_freeze_self_sleep()
{
( export sample_proc=$! ; \
add_sample_proc_to_cgroup ; \
tst_resm TINFO " $sample_proc freezing itself" ; \
"${CG_FILE_WRITE}" "${FREEZE}" > freezer.state ; \
tst_resm TINFO " $sample_proc thawed successfully" ; \
exec sleep $sample_sleep ) &
local rc=$?
export sample_proc=$!
return $rc
}
running_cgroup_test
mount_freezer && {
make_sample_cgroup && {
assert_cgroup_freezer_state "THAWED" \
"ERROR: cgroup freezer started in non-THAWED state" && {
sleep_freeze_self_sleep && {
while /bin/true ; do
trap 'break' ERR
tst_resm TINFO " Waiting for $sample_proc to freeze itself"
# WAIT until FROZEN (see FREEZE self above)
wait_until_frozen
assert_sample_proc_is_frozen
# THAW
issue_thaw_cmd
wait_until_thawed
assert_sample_proc_exists
assert_sample_proc_not_frozen
result=$FINISHED
break
done
trap '' ERR
cleanup_cgroup_test
tst_resm TINFO " Cleaning up $0"
# We need to stop the sample process.
kill_sample_proc ; }
# no inverse op needed for assert
}
rm_sample_cgroup ; }
umount_freezer ; }
# Failsafe cleanup
cleanup_freezer || /bin/true
exit $result
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