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#
# Copyright (c) 2005 XenSource Ltd.
# Copyright (c) 2007 Red Hat
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of version 2.1 of the GNU Lesser General Public
# License as published by the Free Software Foundation.
#
# 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
#
#
# Serialisation
#
LOCK_BASEDIR=/var/run/xen-hotplug
_setlockfd()
{
local i
for ((i = 0; i < ${#_lockdict}; i++))
do [ -z "${_lockdict[$i]}" -o "${_lockdict[$i]}" = "$1" ] && break
done
_lockdict[$i]="$1"
let _lockfd=200+i
}
claim_lock()
{
mkdir -p "$LOCK_BASEDIR"
_setlockfd $1
eval "exec $_lockfd>>$LOCK_BASEDIR/$1"
flock -x $_lockfd
}
release_lock()
{
_setlockfd $1
flock -u $_lockfd
}
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