[Caml-list] memory mapped files with bigarray on windows

["Bauer, Christoph" <bauerchristoph@siemens.com>]

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Dear All,

my program maps  several blocks of a file into memory with Bigarray.Array1.map_file for writing.
Finally the file handle is closed with Unix.close.

On local files system everything works as expected. But if the file is on a network drive,
the resulting file is after the close still  locked [1] and it contains just zeros.

My workaround is, to call  Gc.full_major() before the close. Then all remaining bigarrays are
finalized (the finalizer calls caml_ba_unmap_file(), see bigarray_stubs.c).

Calling Gc.full_major () is somewhat dissatisfying. But I’m not sure how it could be solved more cleanly.
I would expect that Unix.close should unmap all remaining views of the file. But Unix.close knows nothing
about the bigarray mapping.

Maybe a special Bigarray.unmap is the solution.

Does anyone has a better idea?

Thanks,
Christoph Bauer

[1] You can’t delete it in the windows explorer.



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