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import mmap
from joblib.backports import make_memmap, concurrency_safe_rename
from joblib.test.common import with_numpy
from joblib.testing import parametrize
from joblib import Parallel, delayed
@with_numpy
def test_memmap(tmpdir):
fname = tmpdir.join('test.mmap').strpath
size = 5 * mmap.ALLOCATIONGRANULARITY
offset = mmap.ALLOCATIONGRANULARITY + 1
memmap_obj = make_memmap(fname, shape=size, mode='w+', offset=offset)
assert memmap_obj.offset == offset
@parametrize('dst_content', [None, 'dst content'])
@parametrize('backend', [None, 'threading'])
def test_concurrency_safe_rename(tmpdir, dst_content, backend):
src_paths = [tmpdir.join('src_%d' % i) for i in range(4)]
for src_path in src_paths:
src_path.write('src content')
dst_path = tmpdir.join('dst')
if dst_content is not None:
dst_path.write(dst_content)
Parallel(n_jobs=4, backend=backend)(
delayed(concurrency_safe_rename)(src_path.strpath, dst_path.strpath)
for src_path in src_paths
)
assert dst_path.exists()
assert dst_path.read() == 'src content'
for src_path in src_paths:
assert not src_path.exists()
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