annotate tests/test-lock.py @ 26386:146cccdb282b

test-lock.py: fix testing for forks The earlier test worked only because the held count went up to 2, so the first release brought it down to 1. Making a copy of the lock fixes that issue.
author Siddharth Agarwal <sid0@fb.com>
date Thu, 24 Sep 2015 22:00:51 -0700
parents fb1a424e8bff
children e16f80f89a29
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1 from __future__ import absolute_import
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2
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3 import copy
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4 import os
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5 import silenttestrunner
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6 import tempfile
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7 import types
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8 import unittest
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9
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10 from mercurial import (
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11 lock,
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12 scmutil,
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13 )
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14
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15 testlockname = 'testlock'
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16
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17 # work around http://bugs.python.org/issue1515
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18 if types.MethodType not in copy._deepcopy_dispatch:
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19 def _deepcopy_method(x, memo):
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20 return type(x)(x.im_func, copy.deepcopy(x.im_self, memo), x.im_class)
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21 copy._deepcopy_dispatch[types.MethodType] = _deepcopy_method
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22
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23 class lockwrapper(lock.lock):
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24 def __init__(self, pidoffset, *args, **kwargs):
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25 # lock.lock.__init__() calls lock(), so the pidoffset assignment needs
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26 # to be earlier
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27 self._pidoffset = pidoffset
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28 super(lockwrapper, self).__init__(*args, **kwargs)
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29 def _getpid(self):
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30 return os.getpid() + self._pidoffset
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31
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32 class teststate(object):
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33 def __init__(self, testcase, dir, pidoffset=0):
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34 self._testcase = testcase
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35 self._acquirecalled = False
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36 self._releasecalled = False
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37 self._postreleasecalled = False
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38 self.vfs = scmutil.vfs(dir, audit=False)
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39 self._pidoffset = pidoffset
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40
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41 def makelock(self, *args, **kwargs):
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42 l = lockwrapper(self._pidoffset, self.vfs, testlockname,
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43 releasefn=self.releasefn, acquirefn=self.acquirefn,
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44 *args, **kwargs)
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45 l.postrelease.append(self.postreleasefn)
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46 return l
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47
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48 def acquirefn(self):
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49 self._acquirecalled = True
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50
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51 def releasefn(self):
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52 self._releasecalled = True
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53
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54 def postreleasefn(self):
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55 self._postreleasecalled = True
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56
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57 def assertacquirecalled(self, called):
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58 self._testcase.assertEqual(
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59 self._acquirecalled, called,
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60 'expected acquire to be %s but was actually %s' % (
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61 self._tocalled(called),
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62 self._tocalled(self._acquirecalled),
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63 ))
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64
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65 def resetacquirefn(self):
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66 self._acquirecalled = False
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67
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68 def assertreleasecalled(self, called):
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69 self._testcase.assertEqual(
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70 self._releasecalled, called,
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71 'expected release to be %s but was actually %s' % (
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72 self._tocalled(called),
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73 self._tocalled(self._releasecalled),
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74 ))
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75
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76 def assertpostreleasecalled(self, called):
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77 self._testcase.assertEqual(
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78 self._postreleasecalled, called,
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79 'expected postrelease to be %s but was actually %s' % (
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80 self._tocalled(called),
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81 self._tocalled(self._postreleasecalled),
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82 ))
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83
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84 def assertlockexists(self, exists):
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85 actual = self.vfs.lexists(testlockname)
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86 self._testcase.assertEqual(
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87 actual, exists,
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88 'expected lock to %s but actually did %s' % (
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89 self._toexists(exists),
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90 self._toexists(actual),
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91 ))
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92
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93 def _tocalled(self, called):
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94 if called:
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95 return 'called'
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96 else:
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97 return 'not called'
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98
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99 def _toexists(self, exists):
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100 if exists:
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101 return 'exist'
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102 else:
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103 return 'not exist'
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104
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105 class testlock(unittest.TestCase):
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106 def testlock(self):
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107 state = teststate(self, tempfile.mkdtemp(dir=os.getcwd()))
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108 lock = state.makelock()
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109 state.assertacquirecalled(True)
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110 lock.release()
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111 state.assertreleasecalled(True)
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112 state.assertpostreleasecalled(True)
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113 state.assertlockexists(False)
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114
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115 def testrecursivelock(self):
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116 state = teststate(self, tempfile.mkdtemp(dir=os.getcwd()))
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117 lock = state.makelock()
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118 state.assertacquirecalled(True)
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119
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120 state.resetacquirefn()
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121 lock.lock()
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122 # recursive lock should not call acquirefn again
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123 state.assertacquirecalled(False)
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124
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125 lock.release() # brings lock refcount down from 2 to 1
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126 state.assertreleasecalled(False)
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127 state.assertpostreleasecalled(False)
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128 state.assertlockexists(True)
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129
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130 lock.release() # releases the lock
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131 state.assertreleasecalled(True)
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132 state.assertpostreleasecalled(True)
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133 state.assertlockexists(False)
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134
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135 def testlockfork(self):
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136 state = teststate(self, tempfile.mkdtemp(dir=os.getcwd()))
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137 lock = state.makelock()
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138 state.assertacquirecalled(True)
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139
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140 # fake a fork
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141 forklock = copy.deepcopy(lock)
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142 forklock._pidoffset = 1
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143 forklock.release()
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144 state.assertreleasecalled(False)
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145 state.assertpostreleasecalled(False)
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146 state.assertlockexists(True)
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147
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148 # release the actual lock
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149 lock.release()
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150 state.assertreleasecalled(True)
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151 state.assertpostreleasecalled(True)
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152 state.assertlockexists(False)
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153
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154 if __name__ == '__main__':
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155 silenttestrunner.main(__name__)