def test_mmap_closing(self):
"""
Tests that the mmap reference is closed/removed when there aren't any
HDU data references left.
"""
if not _File._mmap_available:
pytest.xfail('not expected to work on platforms without mmap '
'support')
with fits.open(self.data('test0.fits'), memmap=True) as hdul:
assert hdul._file._mmap is None
hdul[1].data
assert hdul._file._mmap is not None
del hdul[1].data
# Should be no more references to data in the file so close the
# mmap
assert hdul._file._mmap is None
hdul[1].data
hdul[2].data
del hdul[1].data
# hdul[2].data is still references so keep the mmap open
assert hdul._file._mmap is not None
del hdul[2].data
assert hdul._file._mmap is None
assert hdul._file._mmap is None
with fits.open(self.data('test0.fits'), memmap=True) as hdul:
hdul[1].data
# When the only reference to the data is on the hdu object, and the
# hdulist it belongs to has been closed, the mmap should be closed as
# well
assert hdul._file._mmap is None
with fits.open(self.data('test0.fits'), memmap=True) as hdul:
data = hdul[1].data
# also make a copy
data_copy = data.copy()
# The HDUList is closed; in fact, get rid of it completely
del hdul
# The data array should still work though...
assert np.all(data == data_copy)
def test_mmap_closing(self):
"""
Tests that the mmap reference is closed/removed when there aren't any
HDU data references left.
"""
if not _File._mmap_available:
pytest.xfail('not expected to work on platforms without mmap '
'support')
with fits.open(self.data('test0.fits'), memmap=True) as hdul:
assert hdul._file._mmap is None
hdul[1].data
assert hdul._file._mmap is not None
del hdul[1].data
# Should be no more references to data in the file so close the
# mmap
assert hdul._file._mmap is None
hdul[1].data
hdul[2].data
del hdul[1].data
# hdul[2].data is still references so keep the mmap open
assert hdul._file._mmap is not None
del hdul[2].data
assert hdul._file._mmap is None
assert hdul._file._mmap is None
with fits.open(self.data('test0.fits'), memmap=True) as hdul:
hdul[1].data
# When the only reference to the data is on the hdu object, and the
# hdulist it belongs to has been closed, the mmap should be closed as
# well
assert hdul._file._mmap is None
with fits.open(self.data('test0.fits'), memmap=True) as hdul:
data = hdul[1].data
# also make a copy
data_copy = data.copy()
# The HDUList is closed; in fact, get rid of it completely
del hdul
# The data array should still work though...
assert np.all(data == data_copy)