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# (c) 2005 Ian Bicking and contributors; written for Paste (http://pythonpaste.org)
# Licensed under the MIT license: http://www.opensource.org/licenses/mit-license.php
"""
Implementation of thread-local storage, for Python versions that don't
have thread local storage natively.
"""

try:
    import threading
except ImportError:
    # No threads, so "thread local" means process-global
    class local(object):
        pass
else:
    try:
        local = threading.local
    except AttributeError:
        # Added in 2.4, but now we'll have to define it ourselves
        import thread
        class local(object):

            def __init__(self):
                self.__dict__['__objs'] = {}

            def __getattr__(self, attr, g=thread.get_ident):
                try:
                    return self.__dict__['__objs'][g()][attr]
                except KeyError:
                    raise AttributeError(
                        "No variable %s defined for the thread %s"
                        % (attr, g()))

            def __setattr__(self, attr, value, g=thread.get_ident):
                self.__dict__['__objs'].setdefault(g(), {})[attr] = value

            def __delattr__(self, attr, g=thread.get_ident):
                try:
                    del self.__dict__['__objs'][g()][attr]
                except KeyError:
                    raise AttributeError(
                        "No variable %s defined for thread %s"
                        % (attr, g()))