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annotate Lib/test/test_threaded_import.py @ 79675:c0a2294de787 2.7

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Issue #16199: Backport 2to3 typo fix from 3.2.
author Chris Jerdonek <chris.jerdonek@gmail.com>
date Thu, 11 Oct 2012 16:15:46 -0700
parents 3a0484200034
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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cc984ed26586 New test adapted from the ancient Demo/threads/bug.py.
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1 # This is a variant of the very old (early 90's) file
cc984ed26586 New test adapted from the ancient Demo/threads/bug.py.
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2 # Demo/threads/bug.py. It simply provokes a number of threads into
cc984ed26586 New test adapted from the ancient Demo/threads/bug.py.
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3 # trying to import the same module "at the same time".
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4 # There are no pleasant failure modes -- most likely is that Python
cc984ed26586 New test adapted from the ancient Demo/threads/bug.py.
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5 # complains several times about module random having no attribute
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6 # randrange, and then Python hangs.
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7
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8 import unittest
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9 from test.test_support import verbose, TestFailed, import_module
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10 thread = import_module('thread')
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11
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12 critical_section = thread.allocate_lock()
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13 done = thread.allocate_lock()
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14
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15 def task():
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16 global N, critical_section, done
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17 import random
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18 x = random.randrange(1, 3)
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19 critical_section.acquire()
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20 N -= 1
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21 # Must release critical_section before releasing done, else the main
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22 # thread can exit and set critical_section to None as part of global
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23 # teardown; then critical_section.release() raises AttributeError.
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24 finished = N == 0
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25 critical_section.release()
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26 if finished:
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27 done.release()
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28
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29 def test_import_hangers():
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30 import sys
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31 if verbose:
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32 print "testing import hangers ...",
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33
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34 import test.threaded_import_hangers
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35 try:
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36 if test.threaded_import_hangers.errors:
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37 raise TestFailed(test.threaded_import_hangers.errors)
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38 elif verbose:
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39 print "OK."
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40 finally:
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41 # In case this test is run again, make sure the helper module
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42 # gets loaded from scratch again.
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43 del sys.modules['test.threaded_import_hangers']
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44
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45 # Tricky: When regrtest imports this module, the thread running regrtest
46909f22170c Implementing an idea from Guido on the checkins list:
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46 # grabs the import lock and won't let go of it until this module returns.
46909f22170c Implementing an idea from Guido on the checkins list:
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47 # All other threads attempting an import hang for the duration. Since
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48 # this test spawns threads that do little *but* import, we can't do that
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49 # successfully until after this module finishes importing and regrtest
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50 # regains control. To make this work, a special case was added to
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51 # regrtest to invoke a module's "test_main" function (if any) after
46909f22170c Implementing an idea from Guido on the checkins list:
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52 # importing it.
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53
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54 def test_main(): # magic name! see above
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55 global N, done
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56
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57 import imp
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58 if imp.lock_held():
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59 # This triggers on, e.g., from test import autotest.
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60 raise unittest.SkipTest("can't run when import lock is held")
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61
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62 done.acquire()
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63 for N in (20, 50) * 3:
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64 if verbose:
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65 print "Trying", N, "threads ...",
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66 for i in range(N):
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67 thread.start_new_thread(task, ())
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68 done.acquire()
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69 if verbose:
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70 print "OK."
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71 done.release()
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72
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73 test_import_hangers()
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74
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75 if __name__ == "__main__":
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76 test_main()