A Tuesday 03 February 2009, afog...@princeton.com escrigué:
> Francesc Alted wrote:
> > At least each open node keeps a reference to the File object. So,
> > in order to remove the File object you must close the nodes that
> > reference to them. See the File.close() for an example on how to
> > do this. I don't know if I have addressed your issue, but if not,
> > please tell me.
>
> Well, let me start with a simple problem. If I open up a file, and
> then don't explicitly close it, when I quit Python I get a "Closing
> remaining open files:" and then a list of all the files. Part of the
> problem is these refcounts. If the only reference was the file
> object, I could be at least be assured that the file objects used in
> a more constrained scope (inside classes or functions) would be
> garbage collected, but that's definitely not the case.
>
> >>> import tables, sys, gc
> >>> gc.set_debug(gc.DEBUG_LEAK)
> >>> gc.collect()
>
> 0
>
> >>> fyle1 = tables.openFile("Foo.h5")
> >>> sys.getrefcount(fyle1)
>
> 6
>
> >>> del fyle1
> >>> gc.collect()
>
> 0
>
> >>> exit()
>
> Closing remaining open files: Foo.h5... done
>
> (I've changed the name of the file to the much smaller "Foo.h5"
> rather than the full path.)
>
> Something is keeping that file object open, and I don't understand
> what. It's obviously not just a reference cycle, because it's not
> showing up in the garbage.
Ah, I think I understand now what you are after. PyTables detects that
there are opened files because they are kept on a dictionary
(`_open_files`) in the `file` module. A function (`close_open_files`)
is registered through the `atexit` module, and if it detects entries in
the `_open_files` dictionary, it proceeds to close them before exiting.
So, if what you want is to avoid closing the file after a ``del
fileh``operation, it should be enough to "unregister" the file first.
Something like:
import tables
fyle1 = tables.openFile("Foo.h5")
del tables.file._open_files[fyle1]
del fyle1
would work.
Hope this helps,
--
Francesc Alted
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