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annotate roundup/backends/portalocker.py @ 3854:f4e8dc583256

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Restored subject parser regexp to the string it was before the... ...implementation of customization of it, i.e., the version from CVS revision 1.184 of mailgw.py. This makes 'testFollowupTitleMatchMultiRe' work again.
author Erik Forsberg <forsberg@users.sourceforge.net>
date Sat, 12 May 2007 16:14:54 +0000
parents c648bebf021e
children 13b3155869e0
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 # ID line added by richard for Roundup file tracking
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5 # $Id: portalocker.py,v 1.9 2006-09-09 05:42:45 richard Exp $
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6
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7 """Cross-platform (posix/nt) API for flock-style file locking.
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8
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9 Synopsis::
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10
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11 import portalocker
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12 file = open("somefile", "r+")
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13 portalocker.lock(file, portalocker.LOCK_EX)
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14 file.seek(12)
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15 file.write("foo")
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16 file.close()
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17
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18 If you know what you're doing, you may choose to::
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19
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20 portalocker.unlock(file)
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21
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22 before closing the file, but why?
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23
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24 Methods::
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25
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26 lock( file, flags )
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27 unlock( file )
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28
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29 Constants::
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30
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31 LOCK_EX
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32 LOCK_SH
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33 LOCK_NB
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34
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35 I learned the win32 technique for locking files from sample code
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36 provided by John Nielsen <nielsenjf@my-deja.com> in the documentation
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37 that accompanies the win32 modules.
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38
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39 :Author: Jonathan Feinberg <jdf@pobox.com>
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40 :Version: Id: portalocker.py,v 1.3 2001/05/29 18:47:55 Administrator Exp
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41 **un-cvsified by richard so the version doesn't change**
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42 """
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43 __docformat__ = 'restructuredtext'
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44
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45 import os
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46
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47 if os.name == 'nt':
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48 import win32con
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49 import win32file
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50 import pywintypes
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51 LOCK_EX = win32con.LOCKFILE_EXCLUSIVE_LOCK
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52 LOCK_SH = 0 # the default
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53 LOCK_NB = win32con.LOCKFILE_FAIL_IMMEDIATELY
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54 # is there any reason not to reuse the following structure?
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55 __overlapped = pywintypes.OVERLAPPED()
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56 elif os.name == 'posix':
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57 import fcntl
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58 LOCK_EX = fcntl.LOCK_EX
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59 LOCK_SH = fcntl.LOCK_SH
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60 LOCK_NB = fcntl.LOCK_NB
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61 else:
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62 raise RuntimeError("PortaLocker only defined for nt and posix platforms")
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63
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64 if os.name == 'nt':
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65 # eugh, we want 0xffff0000 here, but python 2.3 won't let us :(
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66 FFFF0000 = -65536
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67 def lock(file, flags):
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68 hfile = win32file._get_osfhandle(file.fileno())
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69 # LockFileEx is not supported on all Win32 platforms (Win95, Win98,
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70 # WinME).
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71 # If it's not supported, win32file will raise an exception.
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72 # Try LockFileEx first, as it has more functionality and handles
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73 # blocking locks more efficiently.
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74 try:
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75 win32file.LockFileEx(hfile, flags, 0, FFFF0000, __overlapped)
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76 except win32file.error, e:
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77 import winerror
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78 # Propagate upwards all exceptions other than not-implemented.
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79 if e[0] != winerror.ERROR_CALL_NOT_IMPLEMENTED:
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80 raise e
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81
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82 # LockFileEx is not supported. Use LockFile.
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83 # LockFile does not support shared locking -- always exclusive.
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84 # Care: the low/high length params are reversed compared to
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85 # LockFileEx.
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86 if not flags & LOCK_EX:
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87 import warnings
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88 warnings.warn("PortaLocker does not support shared "
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89 "locking on Win9x", RuntimeWarning)
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90 # LockFile only supports immediate-fail locking.
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91 if flags & LOCK_NB:
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92 win32file.LockFile(hfile, 0, 0, FFFF0000, 0)
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93 else:
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94 # Emulate a blocking lock with a polling loop.
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95 import time
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96 while 1:
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97 # Attempt a lock.
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98 try:
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99 win32file.LockFile(hfile, 0, 0, FFFF0000, 0)
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100 break
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101 except win32file.error, e:
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102 # Propagate upwards all exceptions other than lock
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103 # violation.
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104 if e[0] != winerror.ERROR_LOCK_VIOLATION:
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105 raise e
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106 # Sleep and poll again.
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107 time.sleep(0.1)
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108 # TODO: should this return the result of the lock?
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109
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110 def unlock(file):
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111 hfile = win32file._get_osfhandle(file.fileno())
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112 # UnlockFileEx is not supported on all Win32 platforms (Win95, Win98,
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113 # WinME).
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114 # If it's not supported, win32file will raise an api_error exception.
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115 try:
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116 win32file.UnlockFileEx(hfile, 0, FFFF0000, __overlapped)
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117 except win32file.error, e:
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118 import winerror
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119 # Propagate upwards all exceptions other than not-implemented.
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120 if e[0] != winerror.ERROR_CALL_NOT_IMPLEMENTED:
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121 raise e
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122
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123 # UnlockFileEx is not supported. Use UnlockFile.
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124 # Care: the low/high length params are reversed compared to
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125 # UnLockFileEx.
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126 win32file.UnlockFile(hfile, 0, 0, FFFF0000, 0)
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127
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128 elif os.name =='posix':
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129 def lock(file, flags):
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130 fcntl.flock(file.fileno(), flags)
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131 # TODO: should this return the result of the lock?
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132
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133 def unlock(file):
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134 fcntl.flock(file.fileno(), fcntl.LOCK_UN)
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135
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136 if __name__ == '__main__':
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137 from time import time, strftime, localtime
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138 import sys
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139 import portalocker
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140
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141 log = open('log.txt', "a+")
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142 portalocker.lock(log, portalocker.LOCK_EX)
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143
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144 timestamp = strftime("%m/%d/%Y %H:%M:%S\n", localtime(time()))
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145 log.write( timestamp )
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146
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147 print "Wrote lines. Hit enter to release lock."
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148 dummy = sys.stdin.readline()
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149
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150 log.close()
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151
Roundup Issue Tracker: http://roundup-tracker.org/