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bzrlib/tests/test_lock.py
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# Copyright (C) 2009 Canonical Ltd
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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,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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# GNU 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 02110-1301 USA
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"""Tests for OS Locks."""
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from bzrlib import (
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    debug,
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    errors,
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    lock,
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    tests,
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    )
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def load_tests(standard_tests, module, loader):
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    """Parameterize tests for all versions of groupcompress."""
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    scenarios = []
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    for name, write_lock, read_lock in lock._lock_classes:
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        scenarios.append((name, {'write_lock': write_lock,
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                                 'read_lock': read_lock}))
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    suite = loader.suiteClass()
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    result = tests.multiply_tests(standard_tests, scenarios, suite)
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    return result
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class TestOSLock(tests.TestCaseInTempDir):
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    # Set by load_tests
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    read_lock = None
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    write_lock = None
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    def setUp(self):
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        super(TestOSLock, self).setUp()
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        self.build_tree(['a-lock-file'])
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    def test_create_read_lock(self):
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        r_lock = self.read_lock('a-lock-file')
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        r_lock.unlock()
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    def test_create_write_lock(self):
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        w_lock = self.write_lock('a-lock-file')
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        w_lock.unlock()
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    def test_read_locks_share(self):
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        r_lock = self.read_lock('a-lock-file')
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        try:
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            lock2 = self.read_lock('a-lock-file')
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            lock2.unlock()
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        finally:
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            r_lock.unlock()
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    def test_write_locks_are_exclusive(self):
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        w_lock = self.write_lock('a-lock-file')
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        try:
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            self.assertRaises(errors.LockContention,
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                              self.write_lock, 'a-lock-file')
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        finally:
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            w_lock.unlock()
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    def test_read_locks_block_write_locks(self):
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        r_lock = self.read_lock('a-lock-file')
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        try:
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            if lock.have_fcntl and self.write_lock is lock._fcntl_WriteLock:
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                # With -Dlock, fcntl locks are properly exclusive
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                debug.debug_flags.add('strict_locks')
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                self.assertRaises(errors.LockContention,
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                                  self.write_lock, 'a-lock-file')
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                # But not without it
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                debug.debug_flags.remove('strict_locks')
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                try:
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                    w_lock = self.write_lock('a-lock-file')
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                except errors.LockContention:
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                    self.fail('Unexpected success. fcntl read locks'
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                              ' do not usually block write locks')
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                else:
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                    w_lock.unlock()
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                    self.knownFailure('fcntl read locks don\'t'
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                                      ' block write locks without -Dlock')
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            else:
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                self.assertRaises(errors.LockContention,
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                                  self.write_lock, 'a-lock-file')
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        finally:
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            r_lock.unlock()
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    def test_write_locks_block_read_lock(self):
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        w_lock = self.write_lock('a-lock-file')
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        try:
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            if lock.have_fcntl and self.read_lock is lock._fcntl_ReadLock:
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                # With -Dlock, fcntl locks are properly exclusive
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                debug.debug_flags.add('strict_locks')
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                self.assertRaises(errors.LockContention,
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                                  self.read_lock, 'a-lock-file')
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                # But not without it
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                debug.debug_flags.remove('strict_locks')
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                try:
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                    r_lock = self.read_lock('a-lock-file')
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                except errors.LockContention:
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                    self.fail('Unexpected success. fcntl write locks'
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                              ' do not usually block read locks')
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                else:
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                    r_lock.unlock()
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                    self.knownFailure('fcntl write locks don\'t'
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                                      ' block read locks without -Dlock')
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            else:
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                self.assertRaises(errors.LockContention,
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                                  self.read_lock, 'a-lock-file')
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        finally:
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            w_lock.unlock()
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    def test_temporary_write_lock(self):
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        r_lock = self.read_lock('a-lock-file')
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        try:
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            status, w_lock = r_lock.temporary_write_lock()
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            self.assertTrue(status)
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            # This should block another write lock
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            try:
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                self.assertRaises(errors.LockContention,
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                                  self.write_lock, 'a-lock-file')
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            finally:
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                r_lock = w_lock.restore_read_lock()
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            # We should be able to take a read lock now
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            r_lock2 = self.read_lock('a-lock-file')
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            r_lock2.unlock()
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        finally:
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            r_lock.unlock()
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    def test_temporary_write_lock_fails(self):
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        r_lock = self.read_lock('a-lock-file')
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        try:
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            r_lock2 = self.read_lock('a-lock-file')
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            try:
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                status, w_lock = r_lock.temporary_write_lock()
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                self.assertFalse(status)
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                # Taking out the lock requires unlocking and locking again, so
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                # we have to replace the original object
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                r_lock = w_lock
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            finally:
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                r_lock2.unlock()
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            # We should be able to take a read lock now
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            r_lock2 = self.read_lock('a-lock-file')
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            r_lock2.unlock()
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        finally:
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            r_lock.unlock()