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
|
# Copyright (C) 2005 Canonical Ltd
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
__all__ = ['needs_read_lock',
'needs_write_lock',
]
def needs_read_lock(unbound):
"""Decorate unbound to take out and release a read lock.
This decorator can be applied to methods of any class with lock_read() and
unlock() methods.
Typical usage:
class Branch(...):
@needs_read_lock
def branch_method(self, ...):
stuff
"""
def decorated(self, *args, **kwargs):
self.lock_read()
try:
return unbound(self, *args, **kwargs)
finally:
self.unlock()
decorated.__doc__ = unbound.__doc__
decorated.__name__ = unbound.__name__
return decorated
def needs_write_lock(unbound):
"""Decorate unbound to take out and release a write lock."""
def decorated(self, *args, **kwargs):
self.lock_write()
try:
return unbound(self, *args, **kwargs)
finally:
self.unlock()
decorated.__doc__ = unbound.__doc__
decorated.__name__ = unbound.__name__
return decorated
|