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""" Tests for L{twisted.python.threadable}. """ from __future__ import division, absolute_import import sys, pickle try: import threading except ImportError: threadingSkip = "Platform lacks thread support" else: threadingSkip = None from twisted.python.compat import _PY3 from twisted.trial import unittest from twisted.python import threadable class TestObject: synchronized = ['aMethod'] x = -1 y = 1 def aMethod(self): for i in range(10): self.x, self.y = self.y, self.x self.z = self.x + self.y assert self.z == 0, "z == %d, not 0 as expected" % (self.z,) threadable.synchronize(TestObject) class SynchronizationTests(unittest.SynchronousTestCase): def setUp(self): """ Reduce the CPython check interval so that thread switches happen much more often, hopefully exercising more possible race conditions. Also, delay actual test startup until the reactor has been started. """ if _PY3: if getattr(sys, 'getswitchinterval', None) is not None: self.addCleanup(sys.setswitchinterval, sys.getswitchinterval()) sys.setswitchinterval(0.0000001) else: if getattr(sys, 'getcheckinterval', None) is not None: self.addCleanup(sys.setcheckinterval, sys.getcheckinterval()) sys.setcheckinterval(7) def test_synchronizedName(self): """ The name of a synchronized method is inaffected by the synchronization decorator. """ self.assertEqual("aMethod", TestObject.aMethod.__name__) def test_isInIOThread(self): """ L{threadable.isInIOThread} returns C{True} if and only if it is called in the same thread as L{threadable.registerAsIOThread}. """ threadable.registerAsIOThread() foreignResult = [] t = threading.Thread( target=lambda: foreignResult.append(threadable.isInIOThread())) t.start() t.join() self.assertFalse( foreignResult[0], "Non-IO thread reported as IO thread") self.assertTrue( threadable.isInIOThread(), "IO thread reported as not IO thread") def testThreadedSynchronization(self): o = TestObject() errors = [] def callMethodLots(): try: for i in range(1000): o.aMethod() except AssertionError as e: errors.append(str(e)) threads = [] for x in range(5): t = threading.Thread(target=callMethodLots) threads.append(t) t.start() for t in threads: t.join() if errors: raise unittest.FailTest(errors) if threadingSkip is not None: testThreadedSynchronization.skip = threadingSkip test_isInIOThread.skip = threadingSkip def testUnthreadedSynchronization(self): o = TestObject() for i in range(1000): o.aMethod() class SerializationTests(unittest.SynchronousTestCase): def testPickling(self): lock = threadable.XLock() lockType = type(lock) lockPickle = pickle.dumps(lock) newLock = pickle.loads(lockPickle) self.assertIsInstance(newLock, lockType) if threadingSkip is not None: testPickling.skip = threadingSkip def testUnpickling(self): lockPickle = b'ctwisted.python.threadable\nunpickle_lock\np0\n(tp1\nRp2\n.' lock = pickle.loads(lockPickle) newPickle = pickle.dumps(lock, 2) pickle.loads(newPickle)