Thanks Quincy,
Over the holidays I did some checking and I think it is a case of too
many objects opened and not properly closed that is leading to the
failure. The HDF5 calls were part of a larger API which I decided to
scrap because trying to follow it was too difficult and use a simpler
API. The simpler API worked as expected so I was able to make
everything work for writing - unfortunately the API needs to be used
for reading. And has some other issues with the external links. But I
think I know what needs to fixed there.
Cheers,
Allen
On Jan 4, 2010, at 7:40 AM, Quincey Koziol wrote:
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
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