mirror of
https://github.com/apache/cloudstack.git
synced 2025-10-26 08:42:29 +01:00
dd721a832a
Use higher precision timestamp rather than file timestamp to find out the order of lock requester
98 lines
2.5 KiB
Bash
98 lines
2.5 KiB
Bash
#!/bin/bash
|
|
# Licensed to the Apache Software Foundation (ASF) under one
|
|
# or more contributor license agreements. See the NOTICE file
|
|
# distributed with this work for additional information
|
|
# regarding copyright ownership. The ASF licenses this file
|
|
# to you under the Apache License, Version 2.0 (the
|
|
# "License"); you may not use this file except in compliance
|
|
# with the License. You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing,
|
|
# software distributed under the License is distributed on an
|
|
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
|
|
# KIND, either express or implied. See the License for the
|
|
# specific language governing permissions and limitations
|
|
# under the License.
|
|
|
|
# Only one lock is allowed: biglock
|
|
|
|
# getLockFile() parameters
|
|
# $1 lock filename
|
|
# $2 timeout seconds
|
|
getLockFile() {
|
|
__locked=0
|
|
__TS=`date +%s%N`
|
|
__LOCKFILE="/tmp/$__TS-$$-$1.lock"
|
|
if [ $2 ]
|
|
then
|
|
__TIMEOUT=$2
|
|
else
|
|
__TIMEOUT=30
|
|
fi
|
|
|
|
if [ -e $__LOCKFILE ]
|
|
then
|
|
logger -t cloud "Process $0 pid $$ want to get ECLUSIVE LOCK $1 RECURSIVELY!"
|
|
psline=`ps u $$`
|
|
logger -t cloud "Failed job detail: $psline"
|
|
echo 0
|
|
return
|
|
fi
|
|
|
|
psline=`ps u $$`
|
|
echo $psline > $__LOCKFILE
|
|
if [ ! -e $__LOCKFILE ]
|
|
then
|
|
return
|
|
fi
|
|
|
|
for i in `seq 1 $(($__TIMEOUT * 10))`
|
|
do
|
|
currlock=`ls /tmp/*-$1.lock | head -n1`
|
|
if [ $currlock -ef $__LOCKFILE ]
|
|
then
|
|
__locked=1
|
|
break
|
|
fi
|
|
sleep 0.1
|
|
if [ $((i % 10)) -eq 0 ]
|
|
then
|
|
logger -t cloud "Process $0 pid $$ waiting for the lock $1 for another 1 second"
|
|
fi
|
|
done
|
|
if [ $__locked -ne 1 ]
|
|
then
|
|
logger -t cloud "fail to acquire the lock $1 for process $0 pid $$ after $__TIMEOUT seconds time out!"
|
|
cmd=`cat $currlock`
|
|
logger -t cloud "waiting for command: $cmd"
|
|
psline=`ps u $$`
|
|
logger -t cloud "Failed job detail: $psline"
|
|
rm $__LOCKFILE
|
|
fi
|
|
echo $__locked
|
|
}
|
|
|
|
# releaseLockFile() parameters
|
|
# $1 lock filename
|
|
# $2 locked(1) or not(0)
|
|
releaseLockFile() {
|
|
__LOCKFILE="/tmp/*-$$-$1.lock"
|
|
__locked=$2
|
|
if [ "$__locked" == "1" ]
|
|
then
|
|
rm $__LOCKFILE
|
|
fi
|
|
}
|
|
|
|
# releaseLockFile() parameters
|
|
# $1 exit value
|
|
# $2 lock filename
|
|
# $3 locked(1) or not(0)
|
|
unlock_exit() {
|
|
releaseLockFile $2 $3
|
|
exit $1
|
|
}
|
|
|