Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_threaded_import.py @ 58925:eecf1bef052d 2.6

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Merged revisions 78207 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r78207 | ezio.melotti | 2010-02-17 01:26:09 +0200 (Wed, 17 Feb 2010) | 1 line #7930: fix stripid ........
author Ezio Melotti <ezio.melotti@gmail.com>
date Tue, 16 Feb 2010 23:29:44 +0000
parents 0bf9e3099c57
children e6009b9cd908 4cdf21a0dbbc
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1 # This is a variant of the very old (early 90's) file
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2 # Demo/threads/bug.py. It simply provokes a number of threads into
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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
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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 thread
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9 from test.test_support import verbose, TestSkipped, TestFailed
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10
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11 critical_section = thread.allocate_lock()
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12 done = thread.allocate_lock()
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13
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14 def task():
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15 global N, critical_section, done
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16 import random
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17 x = random.randrange(1, 3)
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18 critical_section.acquire()
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19 N -= 1
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20 # Must release critical_section before releasing done, else the main
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21 # thread can exit and set critical_section to None as part of global
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22 # teardown; then critical_section.release() raises AttributeError.
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23 finished = N == 0
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24 critical_section.release()
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25 if finished:
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26 done.release()
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27
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28 def test_import_hangers():
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29 import sys
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30 if verbose:
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31 print "testing import hangers ...",
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32
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33 import test.threaded_import_hangers
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34 try:
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35 if test.threaded_import_hangers.errors:
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36 raise TestFailed(test.threaded_import_hangers.errors)
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37 elif verbose:
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38 print "OK."
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39 finally:
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40 # In case this test is run again, make sure the helper module
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41 # gets loaded from scratch again.
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42 del sys.modules['test.threaded_import_hangers']
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43
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44 # Tricky: When regrtest imports this module, the thread running regrtest
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45 # grabs the import lock and won't let go of it until this module returns.
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46 # All other threads attempting an import hang for the duration. Since
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47 # this test spawns threads that do little *but* import, we can't do that
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48 # successfully until after this module finishes importing and regrtest
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49 # regains control. To make this work, a special case was added to
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50 # regrtest to invoke a module's "test_main" function (if any) after
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51 # importing it.
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52
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53 def test_main(): # magic name! see above
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54 global N, done
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55
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56 import imp
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57 if imp.lock_held():
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58 # This triggers on, e.g., from test import autotest.
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59 raise TestSkipped("can't run when import lock is held")
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60
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61 done.acquire()
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62 for N in (20, 50) * 3:
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63 if verbose:
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64 print "Trying", N, "threads ...",
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65 for i in range(N):
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66 thread.start_new_thread(task, ())
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67 done.acquire()
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68 if verbose:
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69 print "OK."
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70 done.release()
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71
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72 test_import_hangers()
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73
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74 if __name__ == "__main__":
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75 test_main()