79 lines
2.7 KiB
Python
79 lines
2.7 KiB
Python
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"""
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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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from distutils.version import LooseVersion
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from os.path import basename
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from multiprocessing import util
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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', unlink_on_gc_collect=False):
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"""Custom memmap constructor compatible with numpy.memmap.
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This function:
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- is a backport the numpy memmap offset fix (See
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https://github.com/numpy/numpy/pull/8443 for more details.
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The numpy fix is available starting numpy 1.13)
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- adds ``unlink_on_gc_collect``, which specifies explicitly whether
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the process re-constructing the memmap owns a reference to the
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underlying file. If set to True, it adds a finalizer to the
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newly-created memmap that sends a maybe_unlink request for the
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memmaped file to resource_tracker.
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"""
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util.debug(
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"[MEMMAP READ] creating a memmap (shape {}, filename {}, "
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"pid {})".format(shape, basename(filename), os.getpid())
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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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if unlink_on_gc_collect:
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from ._memmapping_reducer import add_maybe_unlink_finalizer
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add_maybe_unlink_finalizer(mm)
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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', unlink_on_gc_collect=False):
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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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from os import replace
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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 can yield permission errors if executed by two
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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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from os import replace as concurrency_safe_rename # noqa
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