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1# (c) 2005 Ian Bicking and contributors; written for Paste (http://pythonpaste.org)
2# Licensed under the MIT license: http://www.opensource.org/licenses/mit-license.php
3"""
4Implementation of thread-local storage, for Python versions that don't
5have thread local storage natively.
6"""
7
8try:
9    import threading
10except ImportError:
11    # No threads, so "thread local" means process-global
12    class local(object):
13        pass
14else:
15    try:
16        local = threading.local
17    except AttributeError:
18        # Added in 2.4, but now we'll have to define it ourselves
19        import thread
20        class local(object):
21
22            def __init__(self):
23                self.__dict__['__objs'] = {}
24
25            def __getattr__(self, attr, g=thread.get_ident):
26                try:
27                    return self.__dict__['__objs'][g()][attr]
28                except KeyError:
29                    raise AttributeError(
30                        "No variable %s defined for the thread %s"
31                        % (attr, g()))
32
33            def __setattr__(self, attr, value, g=thread.get_ident):
34                self.__dict__['__objs'].setdefault(g(), {})[attr] = value
35
36            def __delattr__(self, attr, g=thread.get_ident):
37                try:
38                    del self.__dict__['__objs'][g()][attr]
39                except KeyError:
40                    raise AttributeError(
41                        "No variable %s defined for thread %s"
42                        % (attr, g()))
43
44