Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_poll.py @ 78069:a8aa77458e12 3.2

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Add c_size_t and c_ssize_t to the ctypes summary table.
author Antoine Pitrou <solipsis@pitrou.net>
date Thu, 12 Jul 2012 20:31:50 +0200
parents d4e7470bd660
children 974ace29ee2d 520adfab957e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # Test case for the os.poll() function
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2
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3 import os, select, random, unittest
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4 from test.support import TESTFN, run_unittest
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5
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6 try:
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7 select.poll
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8 except AttributeError:
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9 raise unittest.SkipTest("select.poll not defined -- skipping test_poll")
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10
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11
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12 def find_ready_matching(ready, flag):
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13 match = []
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14 for fd, mode in ready:
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15 if mode & flag:
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16 match.append(fd)
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17 return match
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18
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19 class PollTests(unittest.TestCase):
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20
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21 def test_poll1(self):
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22 # Basic functional test of poll object
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23 # Create a bunch of pipe and test that poll works with them.
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24
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25 p = select.poll()
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26
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27 NUM_PIPES = 12
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28 MSG = b" This is a test."
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29 MSG_LEN = len(MSG)
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30 readers = []
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31 writers = []
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32 r2w = {}
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33 w2r = {}
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34
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35 for i in range(NUM_PIPES):
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36 rd, wr = os.pipe()
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37 p.register(rd)
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38 p.modify(rd, select.POLLIN)
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39 p.register(wr, select.POLLOUT)
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40 readers.append(rd)
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41 writers.append(wr)
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42 r2w[rd] = wr
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43 w2r[wr] = rd
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44
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45 bufs = []
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46
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47 while writers:
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48 ready = p.poll()
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49 ready_writers = find_ready_matching(ready, select.POLLOUT)
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50 if not ready_writers:
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51 raise RuntimeError("no pipes ready for writing")
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52 wr = random.choice(ready_writers)
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53 os.write(wr, MSG)
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54
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55 ready = p.poll()
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56 ready_readers = find_ready_matching(ready, select.POLLIN)
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57 if not ready_readers:
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58 raise RuntimeError("no pipes ready for reading")
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59 rd = random.choice(ready_readers)
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60 buf = os.read(rd, MSG_LEN)
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61 self.assertEqual(len(buf), MSG_LEN)
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62 bufs.append(buf)
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63 os.close(r2w[rd]) ; os.close( rd )
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64 p.unregister( r2w[rd] )
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65 p.unregister( rd )
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66 writers.remove(r2w[rd])
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67
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68 self.assertEqual(bufs, [MSG] * NUM_PIPES)
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69
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70 def poll_unit_tests(self):
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71 # returns NVAL for invalid file descriptor
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72 FD = 42
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73 try:
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74 os.close(FD)
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75 except OSError:
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76 pass
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77 p = select.poll()
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78 p.register(FD)
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79 r = p.poll()
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80 self.assertEqual(r[0], (FD, select.POLLNVAL))
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81
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82 f = open(TESTFN, 'w')
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83 fd = f.fileno()
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84 p = select.poll()
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85 p.register(f)
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86 r = p.poll()
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87 self.assertEqual(r[0][0], fd)
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88 f.close()
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89 r = p.poll()
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90 self.assertEqual(r[0], (fd, select.POLLNVAL))
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91 os.unlink(TESTFN)
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92
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93 # type error for invalid arguments
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94 p = select.poll()
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95 self.assertRaises(TypeError, p.register, p)
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96 self.assertRaises(TypeError, p.unregister, p)
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97
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98 # can't unregister non-existent object
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99 p = select.poll()
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100 self.assertRaises(KeyError, p.unregister, 3)
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101
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102 # Test error cases
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103 pollster = select.poll()
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104 class Nope:
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105 pass
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106
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107 class Almost:
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108 def fileno(self):
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109 return 'fileno'
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110
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111 self.assertRaises(TypeError, pollster.register, Nope(), 0)
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112 self.assertRaises(TypeError, pollster.register, Almost(), 0)
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113
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114 # Another test case for poll(). This is copied from the test case for
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115 # select(), modified to use poll() instead.
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116
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117 def test_poll2(self):
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118 cmd = 'for i in 0 1 2 3 4 5 6 7 8 9; do echo testing...; sleep 1; done'
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119 p = os.popen(cmd, 'r')
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120 pollster = select.poll()
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121 pollster.register( p, select.POLLIN )
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122 for tout in (0, 1000, 2000, 4000, 8000, 16000) + (-1,)*10:
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123 fdlist = pollster.poll(tout)
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124 if (fdlist == []):
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125 continue
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126 fd, flags = fdlist[0]
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127 if flags & select.POLLHUP:
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128 line = p.readline()
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129 if line != "":
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130 self.fail('error: pipe seems to be closed, but still returns data')
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131 continue
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132
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133 elif flags & select.POLLIN:
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134 line = p.readline()
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135 if not line:
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136 break
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137 continue
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138 else:
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139 self.fail('Unexpected return value from select.poll: %s' % fdlist)
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140 p.close()
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141
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142 def test_poll3(self):
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143 # test int overflow
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144 pollster = select.poll()
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145 pollster.register(1)
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146
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147 self.assertRaises(OverflowError, pollster.poll, 1 << 64)
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148
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149 x = 2 + 3
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150 if x != 5:
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151 self.fail('Overflow must have occurred')
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152
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153 def test_main():
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154 run_unittest(PollTests)
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155
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156 if __name__ == '__main__':
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157 test_main()