Hi Allen,
On Dec 19, 2009, at 1:33 PM, allen wrote:
> Hi Quincey,
>
> I am currently using 1.8.2.
>
> One other clue, this only happens when I utilize one particular piece of code
> (a third party lib). If I skip it then the link is followed fine later (I
> access it in multiple places). So I think the link and the permissions are
> okay but how this third party code opens the link initially tends to make it
> inaccessible later on. So my guess is that this particular piece of code
> pooches something. I have not started looking at it yet. (Probably will be
> able to as my hard drive on that machine died Friday night).
>
> Some random thoughts if the file was initially opened as RDONLY with that
> link accessed. If opening the file again as RDWR would that force the access
> to that link to fail?
Yes, that would cause the second access to fail.
> If there a way to see what groups are currently open?
You can use the H5Fget_obj_count/H5Fget_obj_ids routines to investigate
this.
Quincey
> Cheers,
>
> Allen
>
>
> Allen Sanderson
> SCI Institute
> University of Utah
> www.sci.utah.edu
>
>
>
> On Dec 18, 2009, at 10:22 PM, Quincey Koziol wrote:
>
>> Hi Allen,
>>
>> On Dec 18, 2009, at 7:07 PM, Allen Sanderson wrote:
>>
>>> One followup could this problem be related to perhaps already having the
>>> one link open ??? and then trying to open it again???
>>
>> Hmm, are you using the latest release (1.8.4)?
>>
>> Quincey
>>
>>>
>>>
>>> Cheers,
>>>
>>> Allen
>>>
>>>
>>>
>>>
>>> On Dec 18, 2009, at 6:02 PM, Allen Sanderson wrote:
>>>
>>>> I have a file with two external links that at are both at the top level:
>>>>
>>>> HDF5 "DATA.h5" {
>>>> GROUP "/" {
>>>> EXTERNAL_LINK "Mesh" {
>>>> TARGETFILE "Mesh.h5"
>>>> TARGETPATH "/Mesh"
>>>> GROUP "/Mesh" {
>>>> }
>>>> }
>>>> EXTERNAL_LINK "Step#0" {
>>>> TARGETFILE "step_0.h5"
>>>> TARGETPATH "/Step#0"
>>>> GROUP "/Step#0" {
>>>> }
>>>> }
>>>> }
>>>> }
>>>>
>>>> When I open the main file, DATA.h5 as RDONLY I am able to traverse both
>>>> links as one would expect.
>>>>
>>>> However, when I open the main file, DATA.h5 as RDWR the group "/Mesh"
>>>> succeeds but the "Step#0" fails. Both links are created in the exact same
>>>> manner.
>>>>
>>>> if( H5Lcreate_external(MESH_NAME, "/Mesh",
>>>> file_id, "Mesh",
>>>> H5P_DEFAULT, H5P_DEFAULT) < 0 ) {
>>>> }
>>>>
>>>> So I am at a loss as to why the access is different. I tried to follow
>>>> through and understand more on the Property list that is set to teh
>>>> default. ie this var:
>>>> hid_t lapl_id IN: Link access property list identifier.
>>>>
>>>> but I did not get far. Should I be setting something here????
>>>>
>>>>
>>>> Cheers,
>>>>
>>>> Allen
>>>>
>>>>
>>>> Allen Sanderson
>>>> SCI Institute
>>>> University of Utah
>>>> www.sci.utah.edu
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Hdf-forum is for HDF software users discussion.
>>>> [email protected]
>>>> http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
>>>
>>> _______________________________________________
>>> Hdf-forum is for HDF software users discussion.
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>>
>> _______________________________________________
>> Hdf-forum is for HDF software users discussion.
>> [email protected]
>> http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
>
> _______________________________________________
> Hdf-forum is for HDF software users discussion.
> [email protected]
> http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
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