cpython/Lib/test/test_threaded_import.py
Victor Stinner 45df820591 Merged revisions 80552-80556,80564-80566,80568-80571 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

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  r80552 | victor.stinner | 2010-04-27 23:46:03 +0200 (mar., 27 avril 2010) | 3 lines

  Issue #7449, part 1: fix test_support.py for Python compiled without thread
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  r80553 | victor.stinner | 2010-04-27 23:47:01 +0200 (mar., 27 avril 2010) | 1 line

  Issue #7449, part 2: regrtest.py -j option requires thread support
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  r80554 | victor.stinner | 2010-04-27 23:51:26 +0200 (mar., 27 avril 2010) | 9 lines

  Issue #7449 part 3, test_doctest: import trace module in test_coverage()

  Import trace module fail if the threading module is missing. test_coverage() is
  only used if test_doctest.py is used with the -c option. This commit allows to
  execute the test suite without thread support.

  Move "import trace" in test_coverage() and use
  test_support.import_module('trace').
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  r80555 | victor.stinner | 2010-04-27 23:56:26 +0200 (mar., 27 avril 2010) | 6 lines

  Issue #7449, part 4: skip test_multiprocessing if thread support is disabled

  import threading after _multiprocessing to raise a more revelant error message:
  "No module named _multiprocessing". _multiprocessing is not compiled without
  thread support.
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  r80556 | victor.stinner | 2010-04-28 00:01:24 +0200 (mer., 28 avril 2010) | 8 lines

  Issue #7449, part 5: split Test.test_open() of ctypes/test/test_errno.py

   * Split Test.test_open() in 2 functions: test_open() and test_thread_open()
   * Skip test_open() and test_thread_open() if we are unable to find the C
     library
   * Skip test_thread_open() if thread support is disabled
   * Use unittest.skipUnless(os.name == "nt", ...) on test_GetLastError()
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  r80564 | victor.stinner | 2010-04-28 00:59:35 +0200 (mer., 28 avril 2010) | 4 lines

  Issue #7449, part 6: fix test_hashlib for missing threading module

  Move @test_support.reap_thread decorator from test_main() to test_threaded_hashing().
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  r80565 | victor.stinner | 2010-04-28 01:01:29 +0200 (mer., 28 avril 2010) | 6 lines

  Issue #7449, part 7: simplify threading detection in test_capi

   * Skip TestPendingCalls if threading module is missing
   * Test if threading module is present or not, instead of test the presence of
     _testcapi._test_thread_state
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  r80566 | victor.stinner | 2010-04-28 01:03:16 +0200 (mer., 28 avril 2010) | 4 lines

  Issue #7449, part 8: don't skip the whole test_asynchat if threading is missing

  TestFifo can be executed without the threading module
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  r80568 | victor.stinner | 2010-04-28 01:14:58 +0200 (mer., 28 avril 2010) | 6 lines

  Issue #7449, part 9: fix test_xmlrpclib for missing threading module

   * Skip testcases using threads if threading module is missing
   * Use "http://" instead of URL in ServerProxyTestCase if threading is missing
     because URL is not set in this case
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  r80569 | victor.stinner | 2010-04-28 01:33:58 +0200 (mer., 28 avril 2010) | 6 lines

  Partial revert of r80556 (Issue #7449, part 5, fix ctypes test)

  Rewrite r80556: the thread test have to be executed just after the test on
  libc_open() and so the test cannot be splitted in two functions (without
  duplicating code, and I don't want to duplicate code).
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  r80570 | victor.stinner | 2010-04-28 01:51:16 +0200 (mer., 28 avril 2010) | 8 lines

  Issue #7449, part 10: test_cmd imports trace module using test_support.import_module()

  Use test_support.import_module() instead of import to raise a SkipTest
  exception if the import fail. Import trace fails if the threading module is
  missing.

  See also part 3: test_doctest: import trace module in test_coverage().
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  r80571 | victor.stinner | 2010-04-28 01:55:59 +0200 (mer., 28 avril 2010) | 6 lines

  Issue #7449, last part (11): fix many tests if thread support is disabled

   * Use try/except ImportError or test_support.import_module() to import thread
     and threading modules
   * Add @unittest.skipUnless(threading, ...) to testcases using threads
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2010-04-28 22:31:17 +00:00

76 lines
2.5 KiB
Python

# This is a variant of the very old (early 90's) file
# Demo/threads/bug.py. It simply provokes a number of threads into
# trying to import the same module "at the same time".
# There are no pleasant failure modes -- most likely is that Python
# complains several times about module random having no attribute
# randrange, and then Python hangs.
import unittest
from test.support import verbose, TestFailed, import_module
thread = import_module('_thread')
critical_section = thread.allocate_lock()
done = thread.allocate_lock()
def task():
global N, critical_section, done
import random
x = random.randrange(1, 3)
critical_section.acquire()
N -= 1
# Must release critical_section before releasing done, else the main
# thread can exit and set critical_section to None as part of global
# teardown; then critical_section.release() raises AttributeError.
finished = N == 0
critical_section.release()
if finished:
done.release()
def test_import_hangers():
import sys
if verbose:
print("testing import hangers ...", end=' ')
import test.threaded_import_hangers
try:
if test.threaded_import_hangers.errors:
raise TestFailed(test.threaded_import_hangers.errors)
elif verbose:
print("OK.")
finally:
# In case this test is run again, make sure the helper module
# gets loaded from scratch again.
del sys.modules['test.threaded_import_hangers']
# Tricky: When regrtest imports this module, the thread running regrtest
# grabs the import lock and won't let go of it until this module returns.
# All other threads attempting an import hang for the duration. Since
# this test spawns threads that do little *but* import, we can't do that
# successfully until after this module finishes importing and regrtest
# regains control. To make this work, a special case was added to
# regrtest to invoke a module's "test_main" function (if any) after
# importing it.
def test_main(): # magic name! see above
global N, done
import imp
if imp.lock_held():
# This triggers on, e.g., from test import autotest.
raise unittest.SkipTest("can't run when import lock is held")
done.acquire()
for N in (20, 50) * 3:
if verbose:
print("Trying", N, "threads ...", end=' ')
for i in range(N):
thread.start_new_thread(task, ())
done.acquire()
if verbose:
print("OK.")
done.release()
test_import_hangers()
if __name__ == "__main__":
test_main()