Mercurial > repos > shellac > sam_consensus_v3

annotate env/lib/python3.9/site-packages/virtualenv/util/lock.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
parents
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0
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1 """holds locking functionality that works across processes"""
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2 from __future__ import absolute_import, unicode_literals
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3
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4 import logging
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5 import os
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6 from abc import ABCMeta, abstractmethod
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7 from contextlib import contextmanager
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8 from threading import Lock, RLock
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9
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10 from filelock import FileLock, Timeout
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11 from six import add_metaclass
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12
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13 from virtualenv.util.path import Path
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14
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15
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16 class _CountedFileLock(FileLock):
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17 def __init__(self, lock_file):
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18 parent = os.path.dirname(lock_file)
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19 if not os.path.isdir(parent):
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20 try:
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21 os.makedirs(parent)
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22 except OSError:
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23 pass
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24 super(_CountedFileLock, self).__init__(lock_file)
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25 self.count = 0
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26 self.thread_safe = RLock()
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27
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28 def acquire(self, timeout=None, poll_intervall=0.05):
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29 with self.thread_safe:
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30 if self.count == 0:
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31 super(_CountedFileLock, self).acquire(timeout=timeout, poll_intervall=poll_intervall)
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32 self.count += 1
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33
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34 def release(self, force=False):
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35 with self.thread_safe:
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36 if self.count == 1:
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37 super(_CountedFileLock, self).release(force=force)
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38 self.count = max(self.count - 1, 0)
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39
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40
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41 _lock_store = {}
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42 _store_lock = Lock()
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43
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44
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45 @add_metaclass(ABCMeta)
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46 class PathLockBase(object):
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47 def __init__(self, folder):
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48 path = Path(folder)
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49 self.path = path.resolve() if path.exists() else path
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50
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51 def __repr__(self):
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52 return "{}({})".format(self.__class__.__name__, self.path)
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53
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54 def __div__(self, other):
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55 return type(self)(self.path / other)
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56
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57 def __truediv__(self, other):
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58 return self.__div__(other)
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59
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60 @abstractmethod
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61 def __enter__(self):
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62 raise NotImplementedError
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63
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64 @abstractmethod
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65 def __exit__(self, exc_type, exc_val, exc_tb):
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66 raise NotImplementedError
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67
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68 @abstractmethod
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69 @contextmanager
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70 def lock_for_key(self, name, no_block=False):
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71 raise NotImplementedError
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72
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73 @abstractmethod
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74 @contextmanager
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75 def non_reentrant_lock_for_key(name):
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76 raise NotImplementedError
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77
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78
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79 class ReentrantFileLock(PathLockBase):
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80 def __init__(self, folder):
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81 super(ReentrantFileLock, self).__init__(folder)
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82 self._lock = None
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83
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84 def _create_lock(self, name=""):
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85 lock_file = str(self.path / "{}.lock".format(name))
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86 with _store_lock:
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87 if lock_file not in _lock_store:
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88 _lock_store[lock_file] = _CountedFileLock(lock_file)
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89 return _lock_store[lock_file]
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90
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91 @staticmethod
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92 def _del_lock(lock):
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93 with _store_lock:
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94 if lock is not None:
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95 with lock.thread_safe:
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96 if lock.count == 0:
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97 _lock_store.pop(lock.lock_file, None)
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98
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99 def __del__(self):
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100 self._del_lock(self._lock)
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101
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102 def __enter__(self):
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103 self._lock = self._create_lock()
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104 self._lock_file(self._lock)
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105
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106 def __exit__(self, exc_type, exc_val, exc_tb):
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107 self._release(self._lock)
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108
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109 def _lock_file(self, lock, no_block=False):
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110 # multiple processes might be trying to get a first lock... so we cannot check if this directory exist without
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111 # a lock, but that lock might then become expensive, and it's not clear where that lock should live.
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112 # Instead here we just ignore if we fail to create the directory.
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113 try:
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114 os.makedirs(str(self.path))
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115 except OSError:
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116 pass
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117 try:
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118 lock.acquire(0.0001)
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119 except Timeout:
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120 if no_block:
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121 raise
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122 logging.debug("lock file %s present, will block until released", lock.lock_file)
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123 lock.release() # release the acquire try from above
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124 lock.acquire()
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125
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126 @staticmethod
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127 def _release(lock):
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128 lock.release()
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129
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130 @contextmanager
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131 def lock_for_key(self, name, no_block=False):
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132 lock = self._create_lock(name)
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133 try:
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134 try:
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135 self._lock_file(lock, no_block)
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136 yield
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137 finally:
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138 self._release(lock)
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139 finally:
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140 self._del_lock(lock)
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141
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142 @contextmanager
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143 def non_reentrant_lock_for_key(self, name):
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144 with _CountedFileLock(str(self.path / "{}.lock".format(name))):
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145 yield
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146
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147
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148 class NoOpFileLock(PathLockBase):
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149 def __enter__(self):
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150 raise NotImplementedError
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151
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152 def __exit__(self, exc_type, exc_val, exc_tb):
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153 raise NotImplementedError
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154
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155 @contextmanager
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156 def lock_for_key(self, name, no_block=False):
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157 yield
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158
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159 @contextmanager
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160 def non_reentrant_lock_for_key(self, name):
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161 yield
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162
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163
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164 __all__ = (
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165 "NoOpFileLock",
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166 "ReentrantFileLock",
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167 "Timeout",
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168 )