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Text File  |  2005-10-18  |  1KB  |  44 lines
  1. import imp
  2. from test.test_support import TestFailed, TestSkipped
  3. try:
  4.     import thread
  5. except ImportError:
  6.     raise TestSkipped("test only valid when thread support is available")
  7.  
  8. def verify_lock_state(expected):
  9.     if imp.lock_held() != expected:
  10.         raise TestFailed("expected imp.lock_held() to be %r" % expected)
  11.  
  12. def testLock():
  13.     LOOPS = 50
  14.  
  15.     # The import lock may already be held, e.g. if the test suite is run
  16.     # via "import test.autotest".
  17.     lock_held_at_start = imp.lock_held()
  18.     verify_lock_state(lock_held_at_start)
  19.  
  20.     for i in range(LOOPS):
  21.         imp.acquire_lock()
  22.         verify_lock_state(True)
  23.  
  24.     for i in range(LOOPS):
  25.         imp.release_lock()
  26.  
  27.     # The original state should be restored now.
  28.     verify_lock_state(lock_held_at_start)
  29.  
  30.     if not lock_held_at_start:
  31.         try:
  32.             imp.release_lock()
  33.         except RuntimeError:
  34.             pass
  35.         else:
  36.             raise TestFailed("release_lock() without lock should raise "
  37.                              "RuntimeError")
  38.  
  39. def test_main():
  40.     testLock()
  41.  
  42. if __name__ == "__main__":
  43.     test_main()
  44.