framework/threads.py

   1 #
   2 # Copyright (c) 2010 Intel Corporation
   3 #
   4 # Permission is hereby granted, free of charge, to any person obtaining a
   5 # copy of this software and associated documentation files (the "Software"),
   6 # to deal in the Software without restriction, including without limitation
   7 # the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8 # and/or sell copies of the Software, and to permit persons to whom the
   9 # Software is furnished to do so, subject to the following conditions:
  10 #
  11 # The above copyright notice and this permission notice (including the next
  12 # paragraph) shall be included in all copies or substantial portions of the
  13 # Software.
  14 #
  15 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18 # THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20 # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21 # IN THE SOFTWARE.
  22 #
  23
  24 from threadpool import ThreadPool, WorkRequest
  25 from patterns import Singleton
  26 from threading import RLock
  27 from weakref import WeakKeyDictionary
  28
  29 def synchronized_self(function):
  30         '''
  31                 A decorator function for providing multithreaded, synchronized access
  32                 amongst one or more functions within a class instance.
  33         '''
  34         def wrapper(self, *args, **kwargs):
  35                 synchronized_self.locks.setdefault(self, RLock()).acquire()
  36                 try:
  37                         return function(self, *args, **kwargs)
  38                 finally:
  39                         synchronized_self.locks[self].release()
  40         return wrapper
  41
  42 synchronized_self.locks = WeakKeyDictionary() # track the locks for each instance
  43
  44 class ConcurrentTestPool(Singleton):
  45         @synchronized_self
  46         def init(self):
  47                 self.pool = ThreadPool(2)
  48
  49         @synchronized_self
  50         def put(self, callable_, args = None, kwds = None):
  51                 self.pool.putRequest(
  52                         WorkRequest(
  53                                 callable_, args = args, kwds = kwds
  54                         )
  55                 )
  56
  57         def join(self):
  58                 self.pool.wait()