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82 lines
2.6 KiB
Python
82 lines
2.6 KiB
Python
"""
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Backports of fixes for joblib dependencies
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"""
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import os
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import time
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import ctypes
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import sys
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from distutils.version import LooseVersion
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try:
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import numpy as np
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def make_memmap(filename, dtype='uint8', mode='r+', offset=0,
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shape=None, order='C'):
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"""Backport of numpy memmap offset fix.
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See https://github.com/numpy/numpy/pull/8443 for more details.
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The numpy fix will be available in numpy 1.13.
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"""
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mm = np.memmap(filename, dtype=dtype, mode=mode, offset=offset,
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shape=shape, order=order)
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if LooseVersion(np.__version__) < '1.13':
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mm.offset = offset
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return mm
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except ImportError:
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def make_memmap(filename, dtype='uint8', mode='r+', offset=0,
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shape=None, order='C'):
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raise NotImplementedError(
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"'joblib.backports.make_memmap' should not be used "
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'if numpy is not installed.')
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if os.name == 'nt':
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# https://github.com/joblib/joblib/issues/540
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access_denied_errors = (5, 13)
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try:
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from os import replace
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except ImportError:
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# Python 2.7
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def replace(src, dst):
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if not isinstance(src, unicode): # noqa
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src = unicode(src, sys.getfilesystemencoding()) # noqa
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if not isinstance(dst, unicode): # noqa
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dst = unicode(dst, sys.getfilesystemencoding()) # noqa
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movefile_replace_existing = 0x1
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return_value = ctypes.windll.kernel32.MoveFileExW(
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src, dst, movefile_replace_existing)
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if return_value == 0:
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raise ctypes.WinError()
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def concurrency_safe_rename(src, dst):
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"""Renames ``src`` into ``dst`` overwriting ``dst`` if it exists.
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On Windows os.replace (or for Python 2.7 its implementation
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through MoveFileExW) can yield permission errors if executed by
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two different processes.
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"""
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max_sleep_time = 1
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total_sleep_time = 0
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sleep_time = 0.001
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while total_sleep_time < max_sleep_time:
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try:
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replace(src, dst)
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break
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except Exception as exc:
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if getattr(exc, 'winerror', None) in access_denied_errors:
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time.sleep(sleep_time)
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total_sleep_time += sleep_time
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sleep_time *= 2
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else:
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raise
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else:
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raise
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else:
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try:
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from os import replace as concurrency_safe_rename
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except ImportError:
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from os import rename as concurrency_safe_rename # noqa
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