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-rw-r--r--lib/mutex.sh54
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diff --git a/lib/mutex.sh b/lib/mutex.sh
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-# Functions for locking and unlocking mutex objects
-#
-# Copyright (C) 2014 Patrick "P. J." McDermott
-#
-# This file is part of the ProteanOS Development Kit.
-#
-# The ProteanOS Development Kit is free software: you can redistribute
-# it and/or modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation, either version 3 of the
-# License, or (at your option) any later version.
-#
-# The ProteanOS Development Kit 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 General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with the ProteanOS Development Kit. If not, see
-# <http://www.gnu.org/licenses/>.
-
-mutex_trylock()
-{
- local mutex="${1}"
-
- (set -C; printf '%d\n' "${$}" >"${mutex}") 2>/dev/null
-}
-
-mutex_timedlock()
-{
- local mutex="${1}"
- local timeout="${2}"
-
- while ! mutex_trylock "${mutex}"; do
- [ ${timeout} -eq 0 ] && return 1
- timeout=$(($timeout - 1))
- sleep 1
- done
-
- return 0
-}
-
-mutex_unlock()
-{
- local mutex="${1}"
-
- rm "${mutex}"
-}
-
-mutex_is_unlockable()
-{
- local mutex="${1}"
-
- [ "x$(cat "${mutex}" 2>/dev/null)" = "x${$}" ]
-}