/usr/lib/python2.7/dist-packages/sardana/sardanalock.py is in python-sardana 1.6.1-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 | #!/usr/bin/env python
##############################################################################
##
## This file is part of Sardana
##
## http://www.sardana-controls.org/
##
## Copyright 2011 CELLS / ALBA Synchrotron, Bellaterra, Spain
##
## Sardana is free software: you can redistribute it and/or modify
## it under the terms of the GNU Lesser General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## Sardana is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU Lesser General Public License for more details.
##
## You should have received a copy of the GNU Lesser General Public License
## along with Sardana. If not, see <http://www.gnu.org/licenses/>.
##
##############################################################################
"""This module is part of the Python Sardana libray. It defines a *slow* lock
class that provides additional debugging information"""
from __future__ import absolute_import
__all__ = ["SardanaLock"]
__docformat__ = 'restructuredtext'
import logging
import threading
_VERBOSE = True
def SardanaLock(verbose=None, name=None, lock=None):
if verbose is None:
verbose = _VERBOSE
if verbose:
return _SardanaLock(name=name, lock=lock)
if lock is None:
return threading.Lock()
return lock
class _SardanaLock(object):
"""A sardana lock"""
def __init__(self, name=None, lock=None, level=logging.DEBUG):
name = name or self.__class__.__name__
self.__name = name
self.__logger = logging.getLogger(name=name)
self.__level = level
if lock is None:
lock = threading.Lock()
self.__block = lock
self.__owner = None
def __repr__(self):
owner = self.__owner
if owner is not None:
owner = owner.name
return "<%s owner=%r>" % (self.__name, owner)
def owner_name(self):
owner = self.__owner
if owner is not None:
return owner.name
def _note(self, msg, *args):
self.__logger.log(self.__level, msg, *args)
def acquire(self, blocking=1):
if __debug__:
self._note("[START] acquire(%s) [owner=%s]", blocking,
self.owner_name())
rc = self.__block.acquire(blocking)
me = threading.current_thread()
if rc:
self.__owner = me
state = "success"
else:
state = "failure"
if __debug__:
self._note("[ END ] acquire(%s) %s [owner=%s]", blocking, state,
self.owner_name())
return rc
__enter__ = acquire
def release(self):
if __debug__:
self._note("[START] release() [owner=%s]", self.owner_name())
self.__block.release()
self.__owner = None
if __debug__:
self._note("[ END ] release() [owner=%s]", self.owner_name())
def __exit__(self, t, v, tb):
self.release()
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