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|
set -e
. common.locked_mkdir.sh
set +e
LOCK1="${LOCKBASE}/lock_waiters"
# Multiple waiters - one should win
max=1
n=0
[ -d "${LOCK1}" ]
assert_not 0 $? "$0:$LINENO: Lock dir should not exist"
until [ "${n}" -eq "${max}" ]; do
[ -d "${LOCK1}" ]
assert_not 0 $? "$0:$LINENO: Lock dir should not exist"
echo "$0:$LINENO: Parent pid $$ has lock ${n}"
time=$(date +%s)
locked_mkdir 0 ${LOCK1} $$
assert 0 $? "$0:$LINENO: Lock should succeed"
assert_pid "$0:$LINENO" "${LOCK1}" "$$"
nowtime=$(date +%s)
elapsed=$((${nowtime} - ${time}))
[ "${elapsed}" -le 3 ]
assert 0 $? "$0:$LINENO: Lock shouldn't sleep elapsed=${elapsed} ${n}"
# Background waiters
(
mypid=$(sh -c 'echo $PPID')
time=$(date +%s)
locked_mkdir 5 "${LOCK1}" "${mypid}"
got_lock=$?
echo "$0:$LINENO: Pid ${mypid} got_lock=${got_lock} ${n}"
nowtime=$(date +%s)
elapsed=$((${nowtime} - ${time}))
[ "${elapsed}" -le 7 ]
assert 0 $? "$0:$LINENO: Lock slept too long elapsed=${elapsed} ${n}"
if [ "${got_lock}" -eq 0 ]; then
assert_pid "$0:$LINENO" "${LOCK1}" "${mypid}" "${n}"
fi
if [ "${got_lock}" -eq 0 ]; then
# Wait a bit to not allow other waiters to win
sleep 7
fi
exit ${got_lock}
) &
pid_unlock1=$!
(
mypid=$(sh -c 'echo $PPID')
time=$(date +%s)
locked_mkdir 5 "${LOCK1}" "${mypid}"
got_lock=$?
echo "$0:$LINENO: Pid ${mypid} got_lock=${got_lock} ${n}"
nowtime=$(date +%s)
elapsed=$((${nowtime} - ${time}))
[ "${elapsed}" -le 7 ]
assert 0 $? "$0:$LINENO: Lock slept too long elapsed=${elapsed} ${n}"
if [ "${got_lock}" -eq 0 ]; then
assert_pid "$0:$LINENO" "${LOCK1}" "${mypid}" "${n}"
fi
if [ "${got_lock}" -eq 0 ]; then
# Wait a bit to not allow other waiters to win
sleep 7
fi
exit ${got_lock}
) &
pid_unlock2=$!
(
mypid=$(sh -c 'echo $PPID')
time=$(date +%s)
locked_mkdir 5 "${LOCK1}" "${mypid}"
got_lock=$?
echo "$0:$LINENO: Pid ${mypid} got_lock=${got_lock} ${n}"
nowtime=$(date +%s)
elapsed=$((${nowtime} - ${time}))
[ "${elapsed}" -le 7 ]
assert 0 $? "$0:$LINENO: Lock slept too long elapsed=${elapsed} ${n}"
if [ "${got_lock}" -eq 0 ]; then
assert_pid "$0:$LINENO" "${LOCK1}" "${mypid}" "${n}"
fi
if [ "${got_lock}" -eq 0 ]; then
# Wait a bit to not allow other waiters to win
sleep 7
fi
exit ${got_lock}
) &
pid_unlock3=$!
(
mypid=$(sh -c 'echo $PPID')
time=$(date +%s)
locked_mkdir 5 "${LOCK1}" "${mypid}"
got_lock=$?
echo "$0:$LINENO: Pid ${mypid} got_lock=${got_lock} ${n}"
nowtime=$(date +%s)
elapsed=$((${nowtime} - ${time}))
[ "${elapsed}" -le 7 ]
assert 0 $? "$0:$LINENO: Lock slept too long elapsed=${elapsed} ${n}"
if [ "${got_lock}" -eq 0 ]; then
assert_pid "$0:$LINENO" "${LOCK1}" "${mypid}" "${n}"
fi
if [ "${got_lock}" -eq 0 ]; then
# Wait a bit to not allow other waiters to win
sleep 7
fi
exit ${got_lock}
) &
pid_unlock4=$!
# Drop the lock for a child to pickup
sleep 2
echo "$0:$LINENO: Parent pid $$ dropping lock ${n}"
rmdir "${LOCK1}"
assert 0 $? "$0:$LINENO: rmdir should succeed ${n}"
# XXX: Not sleeping should serialize and all should pass
# Wait for each to finish its wait task
sleep 6
# Now a child should own the lock but only *1* should own it. Failed
# waiters return 75 (EX_TEMPFAIL). Any other non-zero is fatal.
_wait "${pid_unlock1}"
status_unlock1=$?
_wait "${pid_unlock2}"
status_unlock2=$?
_wait "${pid_unlock3}"
status_unlock3=$?
_wait "${pid_unlock4}"
status_unlock4=$?
nowtime=$(date +%s)
assert $((75 * 3)) $((status_unlock1 + status_unlock2 + status_unlock3 + \
status_unlock4)) "$0:$LINENO: 3 waiters should timeout on lock and 1 should win ${n}"
[ -d "${LOCK1}" ]
assert 0 $? "$0:$LINENO: Lock dir should exist ${n}"
# Make sure the one who thinks it won actually did win in the end
[ "${status_unlock1}" -eq 0 ] && assert_pid "$0:$LINENO" "${LOCK1}" "${pid_unlock1}"
[ "${status_unlock2}" -eq 0 ] && assert_pid "$0:$LINENO" "${LOCK1}" "${pid_unlock2}"
[ "${status_unlock3}" -eq 0 ] && assert_pid "$0:$LINENO" "${LOCK1}" "${pid_unlock3}"
[ "${status_unlock4}" -eq 0 ] && assert_pid "$0:$LINENO" "${LOCK1}" "${pid_unlock4}"
elapsed=$((${nowtime} - ${time}))
# This is hard to properly test due to the extra sleeps in the children
[ "${elapsed}" -le 20 ]
assert 0 $? "$0:$LINENO: Children locks took too long elapsed=${elapsed} ${n}"
# Should be able to take the lock immediately now without removing the
# dir since children are all dead.
[ -d "${LOCK1}" ]
assert 0 $? "$0:$LINENO: Lock dir should exist ${n}"
time=$(date +%s)
locked_mkdir 2 ${LOCK1} $$
assert 0 $? "$0:$LINENO: Unlocked dir should succeed to lock ${n}"
[ -d "${LOCK1}" ]
assert 0 $? "$0:$LINENO: Lock dir should exist ${n}"
assert_pid "$0:$LINENO" "${LOCK1}" "$$"
nowtime=$(date +%s)
elapsed=$((${nowtime} - ${time}))
[ "${elapsed}" -lt 4 ]
assert 0 $? "$0:$LINENO: Unlocked dir should not wait to lock ${n}"
rmdir "${LOCK1}"
assert 0 $? "$0:$LINENO: rmdir should succeed ${n}"
n=$((n + 1))
done
rm -rf "${LOCKBASE}"
|
