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Viewing changes to bzrlib/lockdir.py

  • Committer: Martin Pool
  • Date: 2006-02-21 07:03:59 UTC
  • mto: This revision was merged to the branch mainline in revision 1569.
  • Revision ID: mbp@sourcefrog.net-20060221070359-e334fefdbbc1a45b
LockDir should use Transport.rename when releasing locks too.

Add simple example of usage as a doctest.

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bzrlib/lockdir.py
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object per actual lock on disk.  This module does nothing to prevent aliasing
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and deadlocks will likely occur if the locks are aliased.
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In the future we may add a "freshen" method which can be called
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by a lock holder to check that their lock has not been broken, and to 
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update the timestamp within it.
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Example usage:
 
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>>> from bzrlib.transport.memory import MemoryTransport
 
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>>> # typically will be obtained from a BzrDir, Branch, etc
 
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>>> t = MemoryTransport()
 
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>>> l = LockDir(t, 'sample-lock')
 
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>>> l.wait_lock()
 
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>>> # do something here
 
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>>> l.unlock()
 
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"""
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import os
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        # rename before deleting, because we can't atomically remove the whole
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        # tree
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        tmpname = '%s.releasing.%s.tmp' % (self.path, rand_chars(20))
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        self.transport.move(self.path, tmpname)
 
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        self.transport.rename(self.path, tmpname)
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        self._lock_held = False
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        self.transport.delete(tmpname + self.INFO_NAME)
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        self.transport.rmdir(tmpname)