Mercurial > p > roundup > code
comparison roundup/backends/locking.py @ 691:3d8ce8e2dcee search_indexing-0-4-2-branch
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| author | Roche Compaan <rochecompaan@users.sourceforge.net> |
|---|---|
| date | Mon, 15 Apr 2002 23:25:16 +0000 |
| parents | |
| children | 54333751e98d 32e41ddf2edb |
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| 683:7f5b51ffe92d | 691:3d8ce8e2dcee |
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| 1 #! /usr/bin/env python | |
| 2 # Copyright (c) 2002 ekit.com Inc (http://www.ekit-inc.com/) | |
| 3 # | |
| 4 # Permission is hereby granted, free of charge, to any person obtaining a copy | |
| 5 # of this software and associated documentation files (the "Software"), to deal | |
| 6 # in the Software without restriction, including without limitation the rights | |
| 7 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
| 8 # copies of the Software, and to permit persons to whom the Software is | |
| 9 # furnished to do so, subject to the following conditions: | |
| 10 # | |
| 11 # The above copyright notice and this permission notice shall be included in | |
| 12 # all copies or substantial portions of the Software. | |
| 13 # | |
| 14 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| 15 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| 16 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
| 17 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
| 18 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
| 19 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
| 20 # SOFTWARE. | |
| 21 | |
| 22 # $Id: locking.py,v 1.1 2002-04-15 23:25:15 richard Exp $ | |
| 23 | |
| 24 '''This module provides a generic interface to acquire and release | |
| 25 exclusive access to a file. | |
| 26 | |
| 27 It should work on Unix and Windows. | |
| 28 ''' | |
| 29 | |
| 30 import portalocker | |
| 31 | |
| 32 def acquire_lock(path, block=1): | |
| 33 '''Acquire a lock for the given path | |
| 34 ''' | |
| 35 import portalocker | |
| 36 file = open(path, 'w') | |
| 37 if block: | |
| 38 portalocker.lock(file, portalocker.LOCK_EX) | |
| 39 else: | |
| 40 portalocker.lock(file, portalocker.LOCK_EX|portalocker.LOCK_NB) | |
| 41 return file | |
| 42 | |
| 43 def release_lock(file): | |
| 44 '''Release our lock on the given path | |
| 45 ''' | |
| 46 portalocker.unlock(file) | |
| 47 | |
| 48 # | |
| 49 # $Log: not supported by cvs2svn $ | |
| 50 # | |
| 51 # |