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annotate roundup/backends/portalocker.py @ 4686:4e740f02e165

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Remove pywin32 installation dependency by porting portalocker.py to ctypes. portalocker.py lock/unlock functions now return result of operation, support for Windows 95/98/ME is removed.
author anatoly techtonik <techtonik@gmail.com>
date Wed, 28 Nov 2012 04:51:56 +0300
parents 6c74a8bff423
children d27de8f08c31
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
4686
4e740f02e165 Remove pywin32 installation dependency by porting portalocker.py to ctypes.
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1 #!/usr/bin/env python
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2 #
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3 # portalocker.py - Cross-platform (posix/nt) API for flock-style file locking.
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4 #
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5 # http://code.activestate.com/recipes/65203-portalocker-cross-platform-posixnt-api-for-flock-s/
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6 #
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7 """
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8 Cross-platform (posix/nt) API for flock-style file locking.
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9
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10 Synopsis::
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11
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12 import portalocker
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13 file = open("somefile", "r+")
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14 portalocker.lock(file, portalocker.LOCK_EX)
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15 file.seek(12)
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16 file.write("foo")
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17 file.close()
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18
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19 If you know what you're doing, you may choose to::
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20
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21 portalocker.unlock(file)
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22
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23 before closing the file, but why?
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24
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25 Methods::
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26
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27 lock( file, flags )
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28 unlock( file )
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29
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30 Constants::
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31
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32 LOCK_EX
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33 LOCK_SH
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34 LOCK_NB
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35
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36 I learned the win32 technique for locking files from sample code
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37 provided by John Nielsen <nielsenjf@my-deja.com> in the documentation
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38 that accompanies the win32 modules.
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39
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40 :Author: Jonathan Feinberg <jdf@pobox.com>
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41
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42 Roundup Changes
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43 ---------------
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44 2012-11-28 (anatoly techtonik)
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45 - Ported to ctypes
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46 - Dropped support for Win95, Win98 and WinME
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47 - Added return result
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48 """
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49
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50 __docformat__ = 'restructuredtext'
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51
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52 import os
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53
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54 if os.name == 'nt':
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55 import msvcrt
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56 from ctypes import *
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57 from ctypes.wintypes import BOOL, DWORD, HANDLE
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58
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59 LOCK_SH = 0 # the default
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60 LOCK_NB = 0x1 # LOCKFILE_FAIL_IMMEDIATELY
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61 LOCK_EX = 0x2 # LOCKFILE_EXCLUSIVE_LOCK
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62
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63 # --- the code is taken from pyserial project ---
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64 #
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65 # detect size of ULONG_PTR
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66 def is_64bit():
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67 return sizeof(c_ulong) != sizeof(c_void_p)
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68 if is_64bit():
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69 ULONG_PTR = c_int64
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70 else:
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71 ULONG_PTR = c_ulong
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72 PVOID = c_void_p
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73
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74 # --- Union inside Structure by stackoverflow:3480240 ---
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75 class _OFFSET(Structure):
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76 _fields_ = [
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77 ('Offset', DWORD),
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78 ('OffsetHigh', DWORD)]
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79
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80 class _OFFSET_UNION(Union):
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81 _anonymous_ = ['_offset']
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82 _fields_ = [
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83 ('_offset', _OFFSET),
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84 ('Pointer', PVOID)]
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85
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86 class OVERLAPPED(Structure):
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87 _anonymous_ = ['_offset_union']
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88 _fields_ = [
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89 ('Internal', ULONG_PTR),
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90 ('InternalHigh', ULONG_PTR),
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91 ('_offset_union', _OFFSET_UNION),
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92 ('hEvent', HANDLE)]
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93
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94 LPOVERLAPPED = POINTER(OVERLAPPED)
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95
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96 # --- Define function prototypes for extra safety ---
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97 LockFileEx = windll.kernel32.LockFileEx
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98 LockFileEx.restype = BOOL
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99 LockFileEx.argtypes = [HANDLE, DWORD, DWORD, DWORD, DWORD, LPOVERLAPPED]
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100 UnlockFileEx = windll.kernel32.UnlockFileEx
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101 UnlockFileEx.restype = BOOL
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102 UnlockFileEx.argtypes = [HANDLE, DWORD, DWORD, DWORD, LPOVERLAPPED]
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103
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104 elif os.name == 'posix':
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105 import fcntl
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106 LOCK_SH = fcntl.LOCK_SH # shared lock
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107 LOCK_NB = fcntl.LOCK_NB # non-blocking
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108 LOCK_EX = fcntl.LOCK_EX
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109 else:
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110 raise RuntimeError("PortaLocker only defined for nt and posix platforms")
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111
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112 if os.name == 'nt':
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113 def lock(file, flags):
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114 """ Return True on success, False otherwise """
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115 hfile = msvcrt.get_osfhandle(file.fileno())
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116 overlapped = OVERLAPPED()
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117 if LockFileEx(hfile, flags, 0, 0, 0xFFFF0000, byref(overlapped)):
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118 return True
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119 else:
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120 return False
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121
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122 def unlock(file):
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123 hfile = msvcrt.get_osfhandle(file.fileno())
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124 overlapped = OVERLAPPED()
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125 if UnlockFileEx(hfile, 0, 0, 0xFFFF0000, byref(overlapped)):
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126 return True
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127 else:
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128 return False
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129
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130 elif os.name =='posix':
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131 def lock(file, flags):
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132 if fcntl.flock(file.fileno(), flags) == 0:
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133 return True
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134 else:
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135 return False
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136
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137 def unlock(file):
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138 if fcntl.flock(file.fileno(), fcntl.LOCK_UN) == 0:
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139 return True
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140 else:
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141 return False
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143 if __name__ == '__main__':
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144 from time import time, strftime, localtime
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145 import sys
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146
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147 log = open('log.txt', "a+")
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148 lock(log, LOCK_EX)
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149
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150 timestamp = strftime("%m/%d/%Y %H:%M:%S\n", localtime(time()))
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151 log.write( timestamp )
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152
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153 print "Wrote lines. Hit enter to release lock."
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154 dummy = sys.stdin.readline()
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155
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156 log.close()
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157
Roundup Issue Tracker: http://roundup-tracker.org/