+++ /dev/null
-"""Faux ``threading`` version using ``dummy_thread`` instead of ``thread``.\r
-\r
-The module ``_dummy_threading`` is added to ``sys.modules`` in order\r
-to not have ``threading`` considered imported. Had ``threading`` been\r
-directly imported it would have made all subsequent imports succeed\r
-regardless of whether ``thread`` was available which is not desired.\r
-\r
-"""\r
-from sys import modules as sys_modules\r
-\r
-import dummy_thread\r
-\r
-# Declaring now so as to not have to nest ``try``s to get proper clean-up.\r
-holding_thread = False\r
-holding_threading = False\r
-holding__threading_local = False\r
-\r
-try:\r
- # Could have checked if ``thread`` was not in sys.modules and gone\r
- # a different route, but decided to mirror technique used with\r
- # ``threading`` below.\r
- if 'thread' in sys_modules:\r
- held_thread = sys_modules['thread']\r
- holding_thread = True\r
- # Must have some module named ``thread`` that implements its API\r
- # in order to initially import ``threading``.\r
- sys_modules['thread'] = sys_modules['dummy_thread']\r
-\r
- if 'threading' in sys_modules:\r
- # If ``threading`` is already imported, might as well prevent\r
- # trying to import it more than needed by saving it if it is\r
- # already imported before deleting it.\r
- held_threading = sys_modules['threading']\r
- holding_threading = True\r
- del sys_modules['threading']\r
-\r
- if '_threading_local' in sys_modules:\r
- # If ``_threading_local`` is already imported, might as well prevent\r
- # trying to import it more than needed by saving it if it is\r
- # already imported before deleting it.\r
- held__threading_local = sys_modules['_threading_local']\r
- holding__threading_local = True\r
- del sys_modules['_threading_local']\r
-\r
- import threading\r
- # Need a copy of the code kept somewhere...\r
- sys_modules['_dummy_threading'] = sys_modules['threading']\r
- del sys_modules['threading']\r
- sys_modules['_dummy__threading_local'] = sys_modules['_threading_local']\r
- del sys_modules['_threading_local']\r
- from _dummy_threading import *\r
- from _dummy_threading import __all__\r
-\r
-finally:\r
- # Put back ``threading`` if we overwrote earlier\r
-\r
- if holding_threading:\r
- sys_modules['threading'] = held_threading\r
- del held_threading\r
- del holding_threading\r
-\r
- # Put back ``_threading_local`` if we overwrote earlier\r
-\r
- if holding__threading_local:\r
- sys_modules['_threading_local'] = held__threading_local\r
- del held__threading_local\r
- del holding__threading_local\r
-\r
- # Put back ``thread`` if we overwrote, else del the entry we made\r
- if holding_thread:\r
- sys_modules['thread'] = held_thread\r
- del held_thread\r
- else:\r
- del sys_modules['thread']\r
- del holding_thread\r
-\r
- del dummy_thread\r
- del sys_modules\r