Python code coverage for Lib/dummy_threading.py

#	count	content
1	n/a	"""Faux ``threading`` version using ``dummy_thread`` instead of ``thread``.
2	n/a
3	n/a	The module ``_dummy_threading`` is added to ``sys.modules`` in order
4	n/a	to not have ``threading`` considered imported. Had ``threading`` been
5	n/a	directly imported it would have made all subsequent imports succeed
6	n/a	regardless of whether ``_thread`` was available which is not desired.
7	n/a
8	n/a	"""
9	n/a	from sys import modules as sys_modules
10	n/a
11	n/a	import _dummy_thread
12	n/a
13	n/a	# Declaring now so as to not have to nest ``try``s to get proper clean-up.
14	n/a	holding_thread = False
15	n/a	holding_threading = False
16	n/a	holding__threading_local = False
17	n/a
18	n/a	try:
19	n/a	# Could have checked if ``_thread`` was not in sys.modules and gone
20	n/a	# a different route, but decided to mirror technique used with
21	n/a	# ``threading`` below.
22	n/a	if '_thread' in sys_modules:
23	n/a	held_thread = sys_modules['_thread']
24	n/a	holding_thread = True
25	n/a	# Must have some module named ``_thread`` that implements its API
26	n/a	# in order to initially import ``threading``.
27	n/a	sys_modules['_thread'] = sys_modules['_dummy_thread']
28	n/a
29	n/a	if 'threading' in sys_modules:
30	n/a	# If ``threading`` is already imported, might as well prevent
31	n/a	# trying to import it more than needed by saving it if it is
32	n/a	# already imported before deleting it.
33	n/a	held_threading = sys_modules['threading']
34	n/a	holding_threading = True
35	n/a	del sys_modules['threading']
36	n/a
37	n/a	if '_threading_local' in sys_modules:
38	n/a	# If ``_threading_local`` is already imported, might as well prevent
39	n/a	# trying to import it more than needed by saving it if it is
40	n/a	# already imported before deleting it.
41	n/a	held__threading_local = sys_modules['_threading_local']
42	n/a	holding__threading_local = True
43	n/a	del sys_modules['_threading_local']
44	n/a
45	n/a	import threading
46	n/a	# Need a copy of the code kept somewhere...
47	n/a	sys_modules['_dummy_threading'] = sys_modules['threading']
48	n/a	del sys_modules['threading']
49	n/a	sys_modules['_dummy__threading_local'] = sys_modules['_threading_local']
50	n/a	del sys_modules['_threading_local']
51	n/a	from _dummy_threading import *
52	n/a	from _dummy_threading import __all__
53	n/a
54	n/a	finally:
55	n/a	# Put back ``threading`` if we overwrote earlier
56	n/a
57	n/a	if holding_threading:
58	n/a	sys_modules['threading'] = held_threading
59	n/a	del held_threading
60	n/a	del holding_threading
61	n/a
62	n/a	# Put back ``_threading_local`` if we overwrote earlier
63	n/a
64	n/a	if holding__threading_local:
65	n/a	sys_modules['_threading_local'] = held__threading_local
66	n/a	del held__threading_local
67	n/a	del holding__threading_local
68	n/a
69	n/a	# Put back ``thread`` if we overwrote, else del the entry we made
70	n/a	if holding_thread:
71	n/a	sys_modules['_thread'] = held_thread
72	n/a	del held_thread
73	n/a	else:
74	n/a	del sys_modules['_thread']
75	n/a	del holding_thread
76	n/a
77	n/a	del _dummy_thread
78	n/a	del sys_modules