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annotate roundup/backends/locking.py @ 1719:eeb167fb8faf

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*** empty log message ***
author Richard Jones <richard@users.sourceforge.net>
date Thu, 03 Jul 2003 23:46:34 +0000
parents 7e0bbefb2a72
children fc52d57c6c3e
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1 #! /usr/bin/env python
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2 # Copyright (c) 2002 ekit.com Inc (http://www.ekit-inc.com/)
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3 #
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4 # Permission is hereby granted, free of charge, to any person obtaining a copy
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5 # of this software and associated documentation files (the "Software"), to deal
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6 # in the Software without restriction, including without limitation the rights
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7 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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8 # copies of the Software, and to permit persons to whom the Software is
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9 # furnished to do so, subject to the following conditions:
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10 #
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11 # The above copyright notice and this permission notice shall be included in
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12 # all copies or substantial portions of the Software.
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13 #
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14 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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15 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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16 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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17 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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18 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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19 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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20 # SOFTWARE.
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21
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22 # $Id: locking.py,v 1.7 2003-07-03 23:43:46 richard Exp $
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24 '''This module provides a generic interface to acquire and release
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25 exclusive access to a file.
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26
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27 It should work on Unix and Windows.
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28 '''
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29
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30 import portalocker
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31
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32 def acquire_lock(path, block=1):
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33 '''Acquire a lock for the given path
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34 '''
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35 import portalocker
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36 file = open(path, 'w')
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37 if block:
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38 portalocker.lock(file, portalocker.LOCK_EX)
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39 else:
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40 portalocker.lock(file, portalocker.LOCK_EX|portalocker.LOCK_NB)
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41 return file
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42
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43 def release_lock(file):
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44 '''Release our lock on the given path
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45 '''
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46 portalocker.unlock(file)
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