mirror of
https://github.com/apache/cloudstack.git
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92 lines
2.3 KiB
Bash
92 lines
2.3 KiB
Bash
#!/bin/bash
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# Copyright (C) 2011 Citrix Systems, Inc. All rights reserved
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#
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# This software is licensed under the GNU General Public License v3 or later.
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#
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# It is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# Only one lock is allowed: biglock
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# getLockFile() parameters
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# $1 lock filename
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# $2 timeout seconds
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getLockFile() {
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__locked=0
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__LOCKFILE="/tmp/$1-$$.lock"
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if [ $2 ]
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then
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__TIMEOUT=$2
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else
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__TIMEOUT=30
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fi
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if [ -e $__LOCKFILE ]
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then
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logger -t cloud "Process $0 pid $$ want to get ECLUSIVE LOCK $1 RECURSIVELY!"
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psline=`ps u $$`
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logger -t cloud "Failed job detail: $psline"
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echo 0
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return
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fi
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psline=`ps u $$`
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echo $psline > $__LOCKFILE
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for i in `seq 1 $(($__TIMEOUT * 10))`
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do
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currlock=`ls -tr /tmp/$1-*.lock | head -n1`
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if [ $currlock -ef $__LOCKFILE ]
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then
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__locked=1
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break
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fi
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sleep 0.1
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if [ $((i % 10)) -eq 0 ]
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then
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logger -t cloud "Process $0 pid $$ waiting for the lock $1 for another 1 second"
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fi
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done
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if [ $__locked -ne 1 ]
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then
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logger -t cloud "fail to acquire the lock $1 for process $0 pid $$ after $__TIMEOUT seconds time out!"
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cmd=`cat $currlock`
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logger -t cloud "waiting for command: $cmd"
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psline=`ps u $$`
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logger -t cloud "Failed job detail: $psline"
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rm $__LOCKFILE
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fi
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echo $__locked
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}
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# releaseLockFile() parameters
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# $1 lock filename
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# $2 locked(1) or not(0)
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releaseLockFile() {
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__LOCKFILE="/tmp/$1-$$.lock"
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__locked=$2
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if [ "$__locked" == "1" ]
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then
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rm $__LOCKFILE
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fi
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}
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# releaseLockFile() parameters
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# $1 exit value
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# $2 lock filename
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# $3 locked(1) or not(0)
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unlock_exit() {
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releaseLockFile $2 $3
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exit $1
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}
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