I'm merging the latest updates from MITK master into my local branch and
seeing an mbilog thread safety issue that I had encountered before, but was
able to work around by always making sure to register a backend at the
beginning of main before any threads are spawned:
mbilog::RegisterBackend(new mbilog::BackendCout());
Now, however, with the latest MITK changes I see that some mbilog output is
written before main even runs (lines like "In AutoLoadModulesFromPath at
... Auto-loading module ...") so this block of code in
mbilog::DistributeToBackends generates a "dummy backend":
static mbilog::BackendCout* dummyBackend = NULL;
if(backends.empty() && (dummyBackend == NULL))
{
dummyBackend = new mbilog::BackendCout();
dummyBackend->SetFull(false);
RegisterBackend(dummyBackend);
}
Then the first mbilog output that I write is comes at the beginning of an
OMP parallelized for loop and more than one (usually) hits the next block
of code in the same mbilog::RegisterBackend method:
else if((backends.size()>1) && (dummyBackend != NULL))
{
//if there was added another backend remove the dummy backend and
delete it
UnregisterBackend(dummyBackend);
delete dummyBackend;
dummyBackend = NULL;
}
Since there is no protection anywhere on dummyBackend I get glibc double
free errors. (backends should also be protected)
I know it's a bit old, but these bug squashing slides indicate that logging
in MITK is thread safe:
http://www.mitk.org/BugSquashingSeminars?action=AttachFile&do=view&target=logging.pdf
Have things changed? I could put in another workaround for this problem,
but I'd rather resolve it properly this time.
Thanks for the help!
Taylor
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