t.p.l.FilesystemLock : class documentation

Part of twisted.python.lockfile View Source View In Hierarchy

Known subclasses: twisted.internet.defer.DeferredFilesystemLock

A mutex.

This relies on the filesystem property that creating a symlink is an atomic operation and that it will fail if the symlink already exists. Deleting the symlink will release the lock.

Instance Variables	name	The name of the file associated with this lock.
	clean	Indicates whether this lock was released cleanly by its last owner. Only meaningful after `lock` has been called and returns True.
	locked	Indicates whether the lock is currently held by this object.

Method	__init__	Undocumented
Method	lock	Acquire this lock.
Method	unlock	Release this lock.

def __init__(self, name): (source)

overridden in twisted.internet.defer.DeferredFilesystemLock

Undocumented

def lock(self): (source)

Acquire this lock.

Returns	True if the lock is acquired, false otherwise. (type: `bool` )
Raises	Any exception os.symlink() may raise, other than EEXIST.

def unlock(self): (source)

Release this lock.

This deletes the directory with the given name.

Raises Any exception os.readlink() may raise, or ValueError if the lock is not owned by this process.

API Documentation for Twisted, generated by pydoctor at 2011-10-27 16:17:34.