80 lines
2.5 KiB
Python
80 lines
2.5 KiB
Python
"""
|
|
Backports of fixes for joblib dependencies
|
|
"""
|
|
import os
|
|
import time
|
|
import ctypes
|
|
import sys
|
|
|
|
from distutils.version import LooseVersion
|
|
|
|
try:
|
|
import numpy as np
|
|
|
|
def make_memmap(filename, dtype='uint8', mode='r+', offset=0,
|
|
shape=None, order='C'):
|
|
"""Backport of numpy memmap offset fix.
|
|
|
|
See https://github.com/numpy/numpy/pull/8443 for more details.
|
|
|
|
The numpy fix will be available in numpy 1.13.
|
|
"""
|
|
mm = np.memmap(filename, dtype=dtype, mode=mode, offset=offset,
|
|
shape=shape, order=order)
|
|
if LooseVersion(np.__version__) < '1.13':
|
|
mm.offset = offset
|
|
return mm
|
|
except ImportError:
|
|
def make_memmap(filename, dtype='uint8', mode='r+', offset=0,
|
|
shape=None, order='C'):
|
|
raise NotImplementedError(
|
|
"'joblib.backports.make_memmap' should not be used "
|
|
'if numpy is not installed.')
|
|
|
|
|
|
if os.name == 'nt':
|
|
error_access_denied = 5
|
|
try:
|
|
from os import replace
|
|
except ImportError:
|
|
# Python 2.7
|
|
def replace(src, dst):
|
|
if not isinstance(src, unicode): # noqa
|
|
src = unicode(src, sys.getfilesystemencoding()) # noqa
|
|
if not isinstance(dst, unicode): # noqa
|
|
dst = unicode(dst, sys.getfilesystemencoding()) # noqa
|
|
|
|
movefile_replace_existing = 0x1
|
|
return_value = ctypes.windll.kernel32.MoveFileExW(
|
|
src, dst, movefile_replace_existing)
|
|
if return_value == 0:
|
|
raise ctypes.WinError()
|
|
|
|
def concurrency_safe_rename(src, dst):
|
|
"""Renames ``src`` into ``dst`` overwriting ``dst`` if it exists.
|
|
|
|
On Windows os.replace (or for Python 2.7 its implementation
|
|
through MoveFileExW) can yield permission errors if executed by
|
|
two different processes.
|
|
"""
|
|
max_sleep_time = 1
|
|
total_sleep_time = 0
|
|
sleep_time = 0.001
|
|
while total_sleep_time < max_sleep_time:
|
|
try:
|
|
replace(src, dst)
|
|
break
|
|
except Exception as exc:
|
|
if getattr(exc, 'winerror', None) == error_access_denied:
|
|
time.sleep(sleep_time)
|
|
total_sleep_time += sleep_time
|
|
sleep_time *= 2
|
|
else:
|
|
raise
|
|
else:
|
|
raise
|
|
else:
|
|
try:
|
|
from os import replace as concurrency_safe_rename
|
|
except ImportError:
|
|
from os import rename as concurrency_safe_rename # noqa
|