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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 """
      4 Implementation of thread-local storage, for Python versions that don't
      5 have thread local storage natively.
      6 """
      7 
      8 try:
      9     import threading
     10 except ImportError:
     11     # No threads, so "thread local" means process-global
     12     class local(object):
     13         pass
     14 else:
     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