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annotate roundup/backends/portalocker.py @ 4680:b6b600ff61e2

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win32: Replace win32file._get_osfhandle with function from msvcrt module
author anatoly techtonik <techtonik@gmail.com>
date Tue, 27 Nov 2012 14:17:05 +0300
parents d269f5f04f7a
children 6c74a8bff423
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # portalocker.py - Cross-platform (posix/nt) API for flock-style file locking.
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2 # Requires python 1.5.2 or better.
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3
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4 """Cross-platform (posix/nt) API for flock-style file locking.
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5
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6 Synopsis::
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7
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8 import portalocker
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9 file = open("somefile", "r+")
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10 portalocker.lock(file, portalocker.LOCK_EX)
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11 file.seek(12)
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12 file.write("foo")
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13 file.close()
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14
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15 If you know what you're doing, you may choose to::
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16
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17 portalocker.unlock(file)
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18
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19 before closing the file, but why?
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20
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21 Methods::
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22
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23 lock( file, flags )
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24 unlock( file )
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25
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26 Constants::
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27
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28 LOCK_EX
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29 LOCK_SH
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30 LOCK_NB
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31
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32 I learned the win32 technique for locking files from sample code
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33 provided by John Nielsen <nielsenjf@my-deja.com> in the documentation
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34 that accompanies the win32 modules.
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35
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36 :Author: Jonathan Feinberg <jdf@pobox.com>
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37 :Version: Id: portalocker.py,v 1.3 2001/05/29 18:47:55 Administrator Exp
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38 **un-cvsified by richard so the version doesn't change**
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39 """
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40 __docformat__ = 'restructuredtext'
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41
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42 import os
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43
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44 if os.name == 'nt':
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45 import win32file
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46 import pywintypes
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47 import msvcrt
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48 LOCK_SH = 0 # the default
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49 LOCK_NB = 0x1 # LOCKFILE_FAIL_IMMEDIATELY
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50 LOCK_EX = 0x2 # LOCKFILE_EXCLUSIVE_LOCK
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51 # is there any reason not to reuse the following structure?
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52 __overlapped = pywintypes.OVERLAPPED()
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53 elif os.name == 'posix':
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54 import fcntl
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55 LOCK_SH = fcntl.LOCK_SH # shared lock
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56 LOCK_NB = fcntl.LOCK_NB # non-blocking
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57 LOCK_EX = fcntl.LOCK_EX
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58 else:
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59 raise RuntimeError("PortaLocker only defined for nt and posix platforms")
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60
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61 if os.name == 'nt':
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62 # eugh, we want 0xffff0000 here, but python 2.3 won't let us :(
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63 FFFF0000 = -65536
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64 def lock(file, flags):
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65 hfile = msvcrt.get_osfhandle(file.fileno())
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66 # LockFileEx is not supported on all Win32 platforms (Win95, Win98,
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67 # WinME).
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68 # If it's not supported, win32file will raise an exception.
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69 # Try LockFileEx first, as it has more functionality and handles
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70 # blocking locks more efficiently.
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71 try:
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72 win32file.LockFileEx(hfile, flags, 0, FFFF0000, __overlapped)
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73 except win32file.error, e:
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74 import winerror
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75 # Propagate upwards all exceptions other than not-implemented.
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76 if e[0] != winerror.ERROR_CALL_NOT_IMPLEMENTED:
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77 raise e
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78
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79 # LockFileEx is not supported. Use LockFile.
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80 # LockFile does not support shared locking -- always exclusive.
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81 # Care: the low/high length params are reversed compared to
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82 # LockFileEx.
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83 if not flags & LOCK_EX:
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84 import warnings
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85 warnings.warn("PortaLocker does not support shared "
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86 "locking on Win9x", RuntimeWarning)
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87 # LockFile only supports immediate-fail locking.
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88 if flags & LOCK_NB:
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89 win32file.LockFile(hfile, 0, 0, FFFF0000, 0)
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90 else:
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91 # Emulate a blocking lock with a polling loop.
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92 import time
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93 while 1:
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94 # Attempt a lock.
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95 try:
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96 win32file.LockFile(hfile, 0, 0, FFFF0000, 0)
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97 break
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98 except win32file.error, e:
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99 # Propagate upwards all exceptions other than lock
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100 # violation.
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101 if e[0] != winerror.ERROR_LOCK_VIOLATION:
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102 raise e
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103 # Sleep and poll again.
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104 time.sleep(0.1)
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105 # TODO: should this return the result of the lock?
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106
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107 def unlock(file):
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108 hfile = msvcrt.get_osfhandle(file.fileno())
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109 # UnlockFileEx is not supported on all Win32 platforms (Win95, Win98,
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110 # WinME).
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111 # If it's not supported, win32file will raise an api_error exception.
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112 try:
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113 win32file.UnlockFileEx(hfile, 0, FFFF0000, __overlapped)
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114 except win32file.error, e:
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115 import winerror
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116 # Propagate upwards all exceptions other than not-implemented.
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117 if e[0] != winerror.ERROR_CALL_NOT_IMPLEMENTED:
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118 raise e
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119
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120 # UnlockFileEx is not supported. Use UnlockFile.
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121 # Care: the low/high length params are reversed compared to
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122 # UnLockFileEx.
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123 win32file.UnlockFile(hfile, 0, 0, FFFF0000, 0)
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124
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125 elif os.name =='posix':
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126 def lock(file, flags):
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127 fcntl.flock(file.fileno(), flags)
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128 # TODO: should this return the result of the lock?
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129
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130 def unlock(file):
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131 fcntl.flock(file.fileno(), fcntl.LOCK_UN)
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133 if __name__ == '__main__':
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134 from time import time, strftime, localtime
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135 import sys
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136
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137 log = open('log.txt', "a+")
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138 lock(log, LOCK_EX)
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139
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140 timestamp = strftime("%m/%d/%Y %H:%M:%S\n", localtime(time()))
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141 log.write( timestamp )
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142
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143 print "Wrote lines. Hit enter to release lock."
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144 dummy = sys.stdin.readline()
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145
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146 log.close()
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147
Roundup Issue Tracker: http://roundup-tracker.org/