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Name: zc.lockfile
Version: 1.0.0
Summary: Basic inter-process locks
Home-page: http://www.python.org/pypi/zc.lockfile
Author: Jim Fulton
Author-email: jim@zope.com
License: ZPL 2.1
Description: *************************
Basic inter-process locks
*************************
The zc.lockfile package provides a basic portable implementation of
interprocess locks using lock files. The purpose if not specifically
to lock files, but to simply provide locks with an implementation
based on file-locking primitives. Of course, these locks could be
used to mediate access to *other* files. For example, the ZODB file
storage implementation uses file locks to mediate access to
file-storage database files. The database files and lock file files
are separate files.
.. contents::
Detailed Documentation
**********************
Lock file support
=================
The ZODB lock_file module provides support for creating file system
locks. These are locks that are implemented with lock files and
OS-provided locking facilities. To create a lock, instantiate a
LockFile object with a file name:
>>> import zc.lockfile
>>> lock = zc.lockfile.LockFile('lock')
If we try to lock the same name, we'll get a lock error:
>>> import zope.testing.loggingsupport
>>> handler = zope.testing.loggingsupport.InstalledHandler('zc.lockfile')
>>> try:
... zc.lockfile.LockFile('lock')
... except zc.lockfile.LockError:
... print "Can't lock file"
Can't lock file
>>> for record in handler.records:
... print record.levelname, record.getMessage()
ERROR Error locking file lock; pid=UNKNOWN
To release the lock, use it's close method:
>>> lock.close()
The lock file is not removed. It is left behind:
>>> import os
>>> os.path.exists('lock')
True
Of course, now that we've released the lock, we can created it again:
>>> lock = zc.lockfile.LockFile('lock')
>>> lock.close()
.. Cleanup
>>> import os
>>> os.remove('lock')
Change History
***************
1.0.0 (2008-10-18)
====================
- Fixed a small bug in error logging.
1.0.0b1 (2007-07-18)
====================
Initial release
Download
**********************
Keywords: lock
Platform: UNKNOWN
Classifier: Programming Language :: Python
Classifier: Development Status :: 4 - Beta
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: Zope Public License
Classifier: Operating System :: POSIX
Classifier: Operating System :: Microsoft :: Windows
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