zcloud 漫画家（zc.lockfile 1.0.0）

时间2025-07-13 20:03:04分类IT科技浏览4114

导读：zc.lockfile 1.0.0 Basic inter-process locks...

zc.lockfile 1.0.0

Basic inter-process locks

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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.

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, well 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 "Cant lock file" Cant lock file >>> for record in handler.records: ... print record.levelname, record.getMessage() ERROR Error locking file lock; pid=UNKNOWN

To release the lock, use its 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 weve released the lock, we can created it again:

>>> lock = zc.lockfile.LockFile(lock) >>> lock.close()

Change History

1.0.0 (2008-10-18)

Fixed a small bug in error logging.

1.0.0b1 (2007-07-18)

Initial release

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File Type Py Version Uploaded on Size # downloads

zc.lockfile-1.0.0.tar.gz

(md5)

>>> import zc.lockfile >>> lock = zc.lockfile.LockFile(lock) >>> import zope.testing.loggingsupport >>> handler = zope.testing.loggingsupport.InstalledHandler(zc.lockfile) >>> try: ... zc.lockfile.LockFile(lock) ... except zc.lockfile.LockError: ... print "Cant lock file" Cant lock file >>> for record in handler.records: ... print record.levelname, record.getMessage() ERROR Error locking file lock; pid=UNKNOWN >>> lock.close() >>> import os >>> os.path.exists(lock) True >>> lock = zc.lockfile.LockFile(lock) >>> lock.close()

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