HI,
This morning I was able to track down a bug with a file with external
links where the file was opened twice simultaneously. The first open
was read only. The second open was read write. However, if I create
the file with the exact same hierarchy but without links I do not see
the bug. I found this odd.
Here is the sequence
fp1 = open file read only
gp1 = open /group using fp1 (note /group is an eternal link)
fp2 = open file read/write
dp2 = open /group/dataset using fp2
the last open fails. I can understand the failure given the gp1 is
read only and dp2 which is under it is trying to perhaps do a write
which could cause some problems. So it fails.
However, if the file has the same hierarchy but without the link it
does not fail. I found this behavior strange as I would have expected
both to behave the same.
Obviously, one solution is not to open the file twice which is
certainly possible but also having both opens be read/write also
works. But I am more concerned with the inconsistency.
Cheers,
Allen
Allen Sanderson
SCI Institute
University of Utah
www.sci.utah.edu
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