Mercurial > p > roundup > code

annotate roundup/backends/locking.py @ 1496:e6ac4e074acb

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
relaxed CVS importing (feature [SF#693277])
author Richard Jones <richard@users.sourceforge.net>
date Thu, 06 Mar 2003 07:33:29 +0000
parents 7e0bbefb2a72
children eeb167fb8faf
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
690
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
1 #! /usr/bin/env python
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
2 # Copyright (c) 2002 ekit.com Inc (http://www.ekit-inc.com/)
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
3 #
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
4 # Permission is hereby granted, free of charge, to any person obtaining a copy
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
5 # of this software and associated documentation files (the "Software"), to deal
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
6 # in the Software without restriction, including without limitation the rights
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
7 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
8 # copies of the Software, and to permit persons to whom the Software is
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
9 # furnished to do so, subject to the following conditions:
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
10 #
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
11 # The above copyright notice and this permission notice shall be included in
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
12 # all copies or substantial portions of the Software.
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
13 #
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
14 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
15 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
16 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
17 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
18 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
19 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
20 # SOFTWARE.
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
21
1459
7e0bbefb2a72 reversing the "make it nicer" checkin
Richard Jones <richard@users.sourceforge.net>
parents: 1430
diff changeset
22 # $Id: locking.py,v 1.6 2003-02-20 22:56:49 richard Exp $
690
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
23
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
24 '''This module provides a generic interface to acquire and release
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
25 exclusive access to a file.
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
26
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
27 It should work on Unix and Windows.
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
28 '''
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
29
1459
7e0bbefb2a72 reversing the "make it nicer" checkin
Richard Jones <richard@users.sourceforge.net>
parents: 1430
diff changeset
30 # portalocker has a 0xffff0000 constant, and I don't need to know about it
7e0bbefb2a72 reversing the "make it nicer" checkin
Richard Jones <richard@users.sourceforge.net>
parents: 1430
diff changeset
31 # being positive in 2.4+ :)
7e0bbefb2a72 reversing the "make it nicer" checkin
Richard Jones <richard@users.sourceforge.net>
parents: 1430
diff changeset
32 try:
7e0bbefb2a72 reversing the "make it nicer" checkin
Richard Jones <richard@users.sourceforge.net>
parents: 1430
diff changeset
33 x=FutureWarning
7e0bbefb2a72 reversing the "make it nicer" checkin
Richard Jones <richard@users.sourceforge.net>
parents: 1430
diff changeset
34 import warnings
7e0bbefb2a72 reversing the "make it nicer" checkin
Richard Jones <richard@users.sourceforge.net>
parents: 1430
diff changeset
35 warnings.filterwarnings("ignore",
7e0bbefb2a72 reversing the "make it nicer" checkin
Richard Jones <richard@users.sourceforge.net>
parents: 1430
diff changeset
36 r'hex/oct constants > sys\.maxint .*', FutureWarning,
7e0bbefb2a72 reversing the "make it nicer" checkin
Richard Jones <richard@users.sourceforge.net>
parents: 1430
diff changeset
37 'portalocker', 0)
7e0bbefb2a72 reversing the "make it nicer" checkin
Richard Jones <richard@users.sourceforge.net>
parents: 1430
diff changeset
38 del x
7e0bbefb2a72 reversing the "make it nicer" checkin
Richard Jones <richard@users.sourceforge.net>
parents: 1430
diff changeset
39 except:
7e0bbefb2a72 reversing the "make it nicer" checkin
Richard Jones <richard@users.sourceforge.net>
parents: 1430
diff changeset
40 pass
7e0bbefb2a72 reversing the "make it nicer" checkin
Richard Jones <richard@users.sourceforge.net>
parents: 1430
diff changeset
41
690
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
42 import portalocker
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
43
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
44 def acquire_lock(path, block=1):
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
45 '''Acquire a lock for the given path
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
46 '''
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
47 import portalocker
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
48 file = open(path, 'w')
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
49 if block:
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
50 portalocker.lock(file, portalocker.LOCK_EX)
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
51 else:
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
52 portalocker.lock(file, portalocker.LOCK_EX|portalocker.LOCK_NB)
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
53 return file
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
54
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
55 def release_lock(file):
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
56 '''Release our lock on the given path
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
57 '''
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
58 portalocker.unlock(file)
Roundup Issue Tracker: http://roundup-tracker.org/