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annotate roundup/backends/portalocker.py @ 1459:7e0bbefb2a72

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reversing the "make it nicer" checkin
author Richard Jones <richard@users.sourceforge.net>
date Thu, 20 Feb 2003 22:56:49 +0000
parents 1159963f769c
children eeb167fb8faf
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 1.5 2003-02-20 22:56:49 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 import os
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44
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45 if os.name == 'nt':
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46 import win32con
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47 import win32file
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48 import pywintypes
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49 LOCK_EX = win32con.LOCKFILE_EXCLUSIVE_LOCK
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50 LOCK_SH = 0 # the default
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51 LOCK_NB = win32con.LOCKFILE_FAIL_IMMEDIATELY
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52 # is there any reason not to reuse the following structure?
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53 __overlapped = pywintypes.OVERLAPPED()
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54 elif os.name == 'posix':
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55 import fcntl
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56 LOCK_EX = fcntl.LOCK_EX
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57 LOCK_SH = fcntl.LOCK_SH
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58 LOCK_NB = fcntl.LOCK_NB
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59 else:
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60 raise RuntimeError("PortaLocker only defined for nt and posix platforms")
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61
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62 if os.name == 'nt':
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63 def lock(file, flags):
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64 hfile = win32file._get_osfhandle(file.fileno())
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65 # LockFileEx is not supported on all Win32 platforms (Win95, Win98, WinME).
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66 # If it's not supported, win32file will raise an exception.
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67 # Try LockFileEx first, as it has more functionality and handles
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68 # blocking locks more efficiently.
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69 try:
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70 win32file.LockFileEx(hfile, flags, 0, 0xffff0000, __overlapped)
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71 except win32file.error, e:
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72 import winerror
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73 # Propagate upwards all exceptions other than not-implemented.
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74 if e[0] != winerror.ERROR_CALL_NOT_IMPLEMENTED:
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75 raise e
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76
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77 # LockFileEx is not supported. Use LockFile.
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78 # LockFile does not support shared locking -- always exclusive.
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79 # Care: the low/high length params are reversed compared to LockFileEx.
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80 if not flags & LOCK_EX:
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81 import warnings
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82 warnings.warn("PortaLocker does not support shared locking on Win9x", RuntimeWarning)
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83 # LockFile only supports immediate-fail locking.
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84 if flags & LOCK_NB:
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85 win32file.LockFile(hfile, 0, 0, 0xffff0000, 0)
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86 else:
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87 # Emulate a blocking lock with a polling loop.
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88 import time
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89 while 1:
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90 # Attempt a lock.
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91 try:
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92 win32file.LockFile(hfile, 0, 0, 0xffff0000, 0)
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93 break
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94 except win32file.error, e:
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95 # Propagate upwards all exceptions other than lock violation.
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96 if e[0] != winerror.ERROR_LOCK_VIOLATION:
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97 raise e
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98 # Sleep and poll again.
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99 time.sleep(0.1)
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100 # TODO: should this return the result of the lock?
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101
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102 def unlock(file):
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103 hfile = win32file._get_osfhandle(file.fileno())
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104 # UnlockFileEx is not supported on all Win32 platforms (Win95, Win98, WinME).
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105 # If it's not supported, win32file will raise an api_error exception.
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106 try:
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107 win32file.UnlockFileEx(hfile, 0, 0xffff0000, __overlapped)
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108 except win32file.error, e:
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109 import winerror
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110 # Propagate upwards all exceptions other than not-implemented.
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111 if e[0] != winerror.ERROR_CALL_NOT_IMPLEMENTED:
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112 raise e
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113
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114 # UnlockFileEx is not supported. Use UnlockFile.
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115 # Care: the low/high length params are reversed compared to UnLockFileEx.
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116 win32file.UnlockFile(hfile, 0, 0, 0xffff0000, 0)
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117
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118 elif os.name =='posix':
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119 def lock(file, flags):
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120 fcntl.flock(file.fileno(), flags)
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121 # TODO: should this return the result of the lock?
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122
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123 def unlock(file):
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124 fcntl.flock(file.fileno(), fcntl.LOCK_UN)
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125
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126 if __name__ == '__main__':
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127 from time import time, strftime, localtime
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128 import sys
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129 import portalocker
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130
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131 log = open('log.txt', "a+")
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132 portalocker.lock(log, portalocker.LOCK_EX)
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133
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134 timestamp = strftime("%m/%d/%Y %H:%M:%S\n", localtime(time()))
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135 log.write( timestamp )
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136
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137 print "Wrote lines. Hit enter to release lock."
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138 dummy = sys.stdin.readline()
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139
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140 log.close()
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141
Roundup Issue Tracker: http://roundup-tracker.org/