[elephant-devel] strange bug related to psets

[Ian Eslick]

Ok, I'll look into this when I can.  May be a few days or so.  Pester  
me if you don't hear back from me next week sometime.

Thanks,
Ian

On May 10, 2008, at 1:13 PM, Ryszard Szopa wrote:

> On Sat, May 10, 2008 at 4:25 PM, Ian Eslick <eslick at media.mit.edu>  
> wrote:
>> This happens in your application, or only in the tests?
>
> Until now I have spotted it only in my unit tests.
>
>> Can you give me the
>> exact sequence and state you use to reproduce? Do you have a fresh  
>> lisp &
>> fresh DB?  Does it still show up if you close the store, open a  
>> fresh one,
>> and try again?  There is likely to be some state somewhere and  
>> identifying
>> the environmental dependencies should help us localize where that is.
>
> My unit test works like this.
>
> 1. Remove all the files in the directory "test/store"
> 2. Open a bdb store located in "test/store" using `with-store'
> 3. Create a bunch of persistent objects (they have psets as slot- 
> values).
> 4. Run some tests (this is the test for a query facility, so I query
> the db and see if I get the right objects back).
> 5. Close the store.
>
> The first time I run the test, everything is OK. The problem arises at
> point 4 during the second and subsequent runs (this may mean that it
> doesn't matter whether the store is fresh, but only whether the lisp
> image is fresh).
>
> Note that at the time the persistent classes are defined, there's a
> different store open (located in the directory "store"), and in point
> 2 I use with-store to open the test store.
>
> As I said, if between point 2 and 3 I call a few times (make-pset),
> the error doesn't occur.
>
> I put quite a lot of effort into isolating the exact code that causes
> the error, unsuccessfully.
>
> Cheers,
>
>    -- Richard
>
> -- 
> http://szopa.tasak.gda.pl/
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