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Viewing changes to breezy/tests/test_lock.py

  • Committer: John Arbash Meinel
  • Date: 2006-04-25 15:05:42 UTC
  • mfrom: (1185.85.85 bzr-encoding)
  • mto: This revision was merged to the branch mainline in revision 1752.
  • Revision ID: john@arbash-meinel.com-20060425150542-c7b518dca9928691
[merge] the old bzr-encoding changes, reparenting them on bzr.dev

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breezy/tests/test_lock.py
1
 
# Copyright (C) 2009, 2011 Canonical Ltd
2
 
#
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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.
7
 
#
8
 
# This program is distributed in the hope that it will be useful,
9
 
# but WITHOUT ANY WARRANTY; without even the implied warranty of
10
 
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11
 
# GNU General Public License for more details.
12
 
#
13
 
# You should have received a copy of the GNU General Public License
14
 
# along with this program; if not, write to the Free Software
15
 
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
16
 
 
17
 
"""Tests for OS Locks."""
18
 
 
19
 
 
20
 
from .. 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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from .scenarios import load_tests_apply_scenarios
27
 
 
28
 
 
29
 
load_tests = load_tests_apply_scenarios
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31
 
 
32
 
class TestOSLock(tests.TestCaseInTempDir):
33
 
 
34
 
    scenarios = [(
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        name, {
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            'write_lock': write_lock,
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            'read_lock': read_lock})
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        for name, write_lock, read_lock in lock._lock_classes]
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40
 
    read_lock = None
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    write_lock = None
42
 
 
43
 
    def setUp(self):
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        super(TestOSLock, self).setUp()
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        self.build_tree(['a-lock-file'])
46
 
 
47
 
    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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51
 
    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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96
 
    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:
100
 
                # With -Dlock, fcntl locks are properly exclusive
101
 
                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
105
 
                debug.debug_flags.remove('strict_locks')
106
 
                try:
107
 
                    r_lock = self.read_lock('a-lock-file')
108
 
                except errors.LockContention:
109
 
                    self.fail('Unexpected success. fcntl write locks'
110
 
                              ' do not usually block read locks')
111
 
                else:
112
 
                    r_lock.unlock()
113
 
                    self.knownFailure('fcntl write locks don\'t'
114
 
                                      ' block read locks without -Dlock')
115
 
            else:
116
 
                self.assertRaises(errors.LockContention,
117
 
                                  self.read_lock, 'a-lock-file')
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        finally:
119
 
            w_lock.unlock()
120
 
 
121
 
    def test_temporary_write_lock(self):
122
 
        r_lock = self.read_lock('a-lock-file')
123
 
        try:
124
 
            status, w_lock = r_lock.temporary_write_lock()
125
 
            self.assertTrue(status)
126
 
            # This should block another write lock
127
 
            try:
128
 
                self.assertRaises(errors.LockContention,
129
 
                                  self.write_lock, 'a-lock-file')
130
 
            finally:
131
 
                r_lock = w_lock.restore_read_lock()
132
 
            # We should be able to take a read lock now
133
 
            r_lock2 = self.read_lock('a-lock-file')
134
 
            r_lock2.unlock()
135
 
        finally:
136
 
            r_lock.unlock()
137
 
 
138
 
    def test_temporary_write_lock_fails(self):
139
 
        r_lock = self.read_lock('a-lock-file')
140
 
        try:
141
 
            r_lock2 = self.read_lock('a-lock-file')
142
 
            try:
143
 
                status, w_lock = r_lock.temporary_write_lock()
144
 
                self.assertFalse(status)
145
 
                # Taking out the lock requires unlocking and locking again, so
146
 
                # we have to replace the original object
147
 
                r_lock = w_lock
148
 
            finally:
149
 
                r_lock2.unlock()
150
 
            # We should be able to take a read lock now
151
 
            r_lock2 = self.read_lock('a-lock-file')
152
 
            r_lock2.unlock()
153
 
        finally:
154
 
            r_lock.unlock()