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      1 import unittest
      2 import test.test_support
      3 
      4 mutex = test.test_support.import_module("mutex", deprecated=True)
      5 
      6 class MutexTest(unittest.TestCase):
      7 
      8     def test_lock_and_unlock(self):
      9 
     10         def called_by_mutex(some_data):
     11             self.assertEqual(some_data, "spam")
     12             self.assertTrue(m.test(), "mutex not held")
     13             # Nested locking
     14             m.lock(called_by_mutex2, "eggs")
     15 
     16         def called_by_mutex2(some_data):
     17             self.assertEqual(some_data, "eggs")
     18             self.assertTrue(m.test(), "mutex not held")
     19             self.assertTrue(ready_for_2,
     20                          "called_by_mutex2 called too soon")
     21 
     22         m = mutex.mutex()
     23         read_for_2 = False
     24         m.lock(called_by_mutex, "spam")
     25         ready_for_2 = True
     26         # unlock both locks
     27         m.unlock()
     28         m.unlock()
     29         self.assertFalse(m.test(), "mutex still held")
     30 
     31 def test_main():
     32     test.test_support.run_unittest(MutexTest)
     33 
     34 if __name__ == "__main__":
     35     test_main()
     36