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Viewing changes to bzrlib/lock.py

  • Committer: Andrew Bennetts
  • Date: 2010-10-08 08:15:14 UTC
  • mto: This revision was merged to the branch mainline in revision 5498.
  • Revision ID: andrew.bennetts@canonical.com-20101008081514-dviqzrdfwyzsqbz2
Split NEWS into per-release doc/en/release-notes/bzr-*.txt

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bzrlib/lock.py
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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"""Locking using OS file locks or file existence.
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Note: This method of locking is generally deprecated in favour of LockDir, but
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unlock() method.
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"""
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from __future__ import absolute_import
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import contextlib
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import errno
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import os
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import sys
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    osutils,
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    trace,
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    )
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from bzrlib.hooks import Hooks
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from bzrlib.i18n import gettext
 
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from bzrlib.hooks import HookPoint, Hooks
 
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class LockHooks(Hooks):
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    def __init__(self):
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        Hooks.__init__(self, "bzrlib.lock", "Lock.hooks")
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        self.add_hook('lock_acquired',
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            "Called with a bzrlib.lock.LockResult when a physical lock is "
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            "acquired.", (1, 8))
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        self.add_hook('lock_released',
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            "Called with a bzrlib.lock.LockResult when a physical lock is "
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            "released.", (1, 8))
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        self.add_hook('lock_broken',
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            "Called with a bzrlib.lock.LockResult when a physical lock is "
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            "broken.", (1, 15))
 
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        Hooks.__init__(self)
 
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        self.create_hook(HookPoint('lock_acquired',
 
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            "Called with a bzrlib.lock.LockResult when a physical lock is "
 
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            "acquired.", (1, 8), None))
 
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        self.create_hook(HookPoint('lock_released',
 
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            "Called with a bzrlib.lock.LockResult when a physical lock is "
 
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            "released.", (1, 8), None))
 
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        self.create_hook(HookPoint('lock_broken',
 
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            "Called with a bzrlib.lock.LockResult when a physical lock is "
 
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            "broken.", (1, 15), None))
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class Lock(object):
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            self.f.close()
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            self.f = None
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    def __del__(self):
 
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        if self.f:
 
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            from warnings import warn
 
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            warn("lock on %r not released" % self.f)
 
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            self.unlock()
 
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    def unlock(self):
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        raise NotImplementedError()
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    locked the same way), and -Drelock is set, then this will trace.note a
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    message about it.
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    """
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    _prev_lock = None
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    def _note_lock(self, lock_type):
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                type_name = 'read'
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            else:
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                type_name = 'write'
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            trace.note(gettext('{0!r} was {1} locked again'), self, type_name)
 
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            trace.note('%r was %s locked again', self, type_name)
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        self._prev_lock = lock_type
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@contextlib.contextmanager
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def write_locked(lockable):
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    lockable.lock_write()
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    try:
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        yield lockable
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    finally:
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        lockable.unlock()