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annotate Lib/dummy_threading.py @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents 1163f55dad95
children 7fe3a8648ce2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 """Faux ``threading`` version using ``dummy_thread`` instead of ``thread``.
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2
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3 The module ``_dummy_threading`` is added to ``sys.modules`` in order
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4 to not have ``threading`` considered imported. Had ``threading`` been
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5 directly imported it would have made all subsequent imports succeed
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6 regardless of whether ``thread`` was available which is not desired.
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7
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8 """
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9 from sys import modules as sys_modules
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10
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11 import dummy_thread
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12
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13 # Declaring now so as to not have to nest ``try``s to get proper clean-up.
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14 holding_thread = False
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15 holding_threading = False
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16 holding__threading_local = False
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17
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18 try:
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19 # Could have checked if ``thread`` was not in sys.modules and gone
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20 # a different route, but decided to mirror technique used with
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21 # ``threading`` below.
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22 if 'thread' in sys_modules:
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23 held_thread = sys_modules['thread']
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24 holding_thread = True
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25 # Must have some module named ``thread`` that implements its API
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26 # in order to initially import ``threading``.
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27 sys_modules['thread'] = sys_modules['dummy_thread']
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28
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29 if 'threading' in sys_modules:
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30 # If ``threading`` is already imported, might as well prevent
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31 # trying to import it more than needed by saving it if it is
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32 # already imported before deleting it.
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33 held_threading = sys_modules['threading']
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34 holding_threading = True
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35 del sys_modules['threading']
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36
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37 if '_threading_local' in sys_modules:
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38 # If ``_threading_local`` is already imported, might as well prevent
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39 # trying to import it more than needed by saving it if it is
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40 # already imported before deleting it.
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41 held__threading_local = sys_modules['_threading_local']
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42 holding__threading_local = True
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43 del sys_modules['_threading_local']
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44
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45 import threading
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46 # Need a copy of the code kept somewhere...
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47 sys_modules['_dummy_threading'] = sys_modules['threading']
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48 del sys_modules['threading']
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49 sys_modules['_dummy__threading_local'] = sys_modules['_threading_local']
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50 del sys_modules['_threading_local']
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51 from _dummy_threading import *
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52 from _dummy_threading import __all__
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53
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54 finally:
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55 # Put back ``threading`` if we overwrote earlier
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56
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57 if holding_threading:
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58 sys_modules['threading'] = held_threading
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59 del held_threading
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60 del holding_threading
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61
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62 # Put back ``_threading_local`` if we overwrote earlier
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63
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64 if holding__threading_local:
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65 sys_modules['_threading_local'] = held__threading_local
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66 del held__threading_local
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67 del holding__threading_local
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68
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69 # Put back ``thread`` if we overwrote, else del the entry we made
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70 if holding_thread:
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71 sys_modules['thread'] = held_thread
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72 del held_thread
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73 else:
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74 del sys_modules['thread']
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75 del holding_thread
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76
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77 del dummy_thread
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78 del sys_modules