root / test / ganeti.locking_unittest.py @ 84152b96
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#!/usr/bin/python
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#
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# Copyright (C) 2006, 2007 Google Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 0.0510-1301, USA.
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"""Script for unittesting the locking module"""
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import os |
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import unittest |
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import time |
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import Queue |
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from ganeti import locking |
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from ganeti import errors |
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from threading import Thread |
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class TestSharedLock(unittest.TestCase): |
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"""SharedLock tests"""
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def setUp(self): |
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self.sl = locking.SharedLock()
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# helper threads use the 'done' queue to tell the master they finished.
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self.done = Queue.Queue(0) |
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def testSequenceAndOwnership(self): |
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self.assert_(not self.sl._is_owned()) |
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self.sl.acquire(shared=1) |
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self.assert_(self.sl._is_owned()) |
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self.assert_(self.sl._is_owned(shared=1)) |
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self.assert_(not self.sl._is_owned(shared=0)) |
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self.sl.release()
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self.assert_(not self.sl._is_owned()) |
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self.sl.acquire()
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self.assert_(self.sl._is_owned()) |
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self.assert_(not self.sl._is_owned(shared=1)) |
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self.assert_(self.sl._is_owned(shared=0)) |
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self.sl.release()
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self.assert_(not self.sl._is_owned()) |
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self.sl.acquire(shared=1) |
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self.assert_(self.sl._is_owned()) |
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self.assert_(self.sl._is_owned(shared=1)) |
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self.assert_(not self.sl._is_owned(shared=0)) |
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self.sl.release()
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self.assert_(not self.sl._is_owned()) |
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def testBooleanValue(self): |
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# semaphores are supposed to return a true value on a successful acquire
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self.assert_(self.sl.acquire(shared=1)) |
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self.sl.release()
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self.assert_(self.sl.acquire()) |
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self.sl.release()
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def testDoubleLockingStoE(self): |
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self.sl.acquire(shared=1) |
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self.assertRaises(AssertionError, self.sl.acquire) |
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def testDoubleLockingEtoS(self): |
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self.sl.acquire()
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self.assertRaises(AssertionError, self.sl.acquire, shared=1) |
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def testDoubleLockingStoS(self): |
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self.sl.acquire(shared=1) |
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self.assertRaises(AssertionError, self.sl.acquire, shared=1) |
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def testDoubleLockingEtoE(self): |
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self.sl.acquire()
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self.assertRaises(AssertionError, self.sl.acquire) |
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# helper functions: called in a separate thread they acquire the lock, send
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# their identifier on the done queue, then release it.
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def _doItSharer(self): |
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try:
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self.sl.acquire(shared=1) |
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self.done.put('SHR') |
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self.sl.release()
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except errors.LockError:
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self.done.put('ERR') |
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def _doItExclusive(self): |
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try:
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self.sl.acquire()
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self.done.put('EXC') |
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self.sl.release()
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except errors.LockError:
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self.done.put('ERR') |
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def _doItDelete(self): |
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try:
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self.sl.delete()
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self.done.put('DEL') |
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except errors.LockError:
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self.done.put('ERR') |
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def testSharersCanCoexist(self): |
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self.sl.acquire(shared=1) |
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Thread(target=self._doItSharer).start()
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self.assert_(self.done.get(True, 1)) |
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self.sl.release()
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def testExclusiveBlocksExclusive(self): |
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self.sl.acquire()
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Thread(target=self._doItExclusive).start()
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# give it a bit of time to check that it's not actually doing anything
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self.assertRaises(Queue.Empty, self.done.get, True, 0.2) |
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self.sl.release()
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self.assert_(self.done.get(True, 1)) |
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def testExclusiveBlocksDelete(self): |
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self.sl.acquire()
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Thread(target=self._doItDelete).start()
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# give it a bit of time to check that it's not actually doing anything
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self.assertRaises(Queue.Empty, self.done.get, True, 0.2) |
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self.sl.release()
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self.assert_(self.done.get(True, 1)) |
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def testExclusiveBlocksSharer(self): |
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self.sl.acquire()
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Thread(target=self._doItSharer).start()
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time.sleep(0.05)
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self.assertRaises(Queue.Empty, self.done.get, True, 0.2) |
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self.sl.release()
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self.assert_(self.done.get(True, 1)) |
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def testSharerBlocksExclusive(self): |
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self.sl.acquire(shared=1) |
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Thread(target=self._doItExclusive).start()
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time.sleep(0.05)
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self.assertRaises(Queue.Empty, self.done.get, True, 0.2) |
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self.sl.release()
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self.assert_(self.done.get(True, 1)) |
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def testSharerBlocksDelete(self): |
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self.sl.acquire(shared=1) |
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Thread(target=self._doItDelete).start()
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time.sleep(0.05)
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self.assertRaises(Queue.Empty, self.done.get, True, 0.2) |
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self.sl.release()
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self.assert_(self.done.get(True, 1)) |
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def testWaitingExclusiveBlocksSharer(self): |
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self.sl.acquire(shared=1) |
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# the lock is acquired in shared mode...
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Thread(target=self._doItExclusive).start()
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# ...but now an exclusive is waiting...
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time.sleep(0.05)
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Thread(target=self._doItSharer).start()
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# ...so the sharer should be blocked as well
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self.assertRaises(Queue.Empty, self.done.get, True, 0.2) |
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self.sl.release()
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# The exclusive passed before
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self.assertEqual(self.done.get(True, 1), 'EXC') |
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self.assertEqual(self.done.get(True, 1), 'SHR') |
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def testWaitingSharerBlocksExclusive(self): |
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self.sl.acquire()
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# the lock is acquired in exclusive mode...
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Thread(target=self._doItSharer).start()
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# ...but now a sharer is waiting...
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time.sleep(0.05)
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Thread(target=self._doItExclusive).start()
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# ...the exclusive is waiting too...
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self.assertRaises(Queue.Empty, self.done.get, True, 0.2) |
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self.sl.release()
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# The sharer passed before
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self.assertEqual(self.done.get(True, 1), 'SHR') |
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self.assertEqual(self.done.get(True, 1), 'EXC') |
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def testNoNonBlocking(self): |
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self.assertRaises(NotImplementedError, self.sl.acquire, blocking=0) |
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self.assertRaises(NotImplementedError, self.sl.delete, blocking=0) |
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self.sl.acquire()
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self.sl.delete(blocking=0) # Fine, because the lock is already acquired |
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def testDelete(self): |
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self.sl.delete()
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self.assertRaises(errors.LockError, self.sl.acquire) |
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self.assertRaises(errors.LockError, self.sl.acquire, shared=1) |
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self.assertRaises(errors.LockError, self.sl.delete) |
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def testNoDeleteIfSharer(self): |
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self.sl.acquire(shared=1) |
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self.assertRaises(AssertionError, self.sl.delete) |
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def testDeletePendingSharersExclusiveDelete(self): |
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self.sl.acquire()
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Thread(target=self._doItSharer).start()
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Thread(target=self._doItSharer).start()
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time.sleep(0.05)
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Thread(target=self._doItExclusive).start()
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Thread(target=self._doItDelete).start()
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time.sleep(0.05)
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self.sl.delete()
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# The two threads who were pending return both ERR
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self.assertEqual(self.done.get(True, 1), 'ERR') |
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self.assertEqual(self.done.get(True, 1), 'ERR') |
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self.assertEqual(self.done.get(True, 1), 'ERR') |
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self.assertEqual(self.done.get(True, 1), 'ERR') |
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def testDeletePendingDeleteExclusiveSharers(self): |
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self.sl.acquire()
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Thread(target=self._doItDelete).start()
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Thread(target=self._doItExclusive).start()
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time.sleep(0.05)
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Thread(target=self._doItSharer).start()
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Thread(target=self._doItSharer).start()
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time.sleep(0.05)
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self.sl.delete()
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# The two threads who were pending return both ERR
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self.assertEqual(self.done.get(True, 1), 'ERR') |
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self.assertEqual(self.done.get(True, 1), 'ERR') |
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self.assertEqual(self.done.get(True, 1), 'ERR') |
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self.assertEqual(self.done.get(True, 1), 'ERR') |
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if __name__ == '__main__': |
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unittest.main() |
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#suite = unittest.TestLoader().loadTestsFromTestCase(TestSharedLock)
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#unittest.TextTestRunner(verbosity=2).run(suite)
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