PG Bug reporting form <noreply@postgresql.org> writes:
> I found that the get_descriptors() function called in ECPGdeallocate_desc
> sometimes can return null.
> The following debugging code inserted into the ECPGallocate_desc:
> ...
> shows on a failure:
> TlsGetValue() returned null on iteration 209, error: 0, descriptor_key: 28,
> initial descriptor_key: 0.
> or
> TlsGetValue() returned null on iteration: 369, error: 0, descriptor_key: 28,
> initial descriptor_key: 0
Hm. I'm supposing that 0 isn't likely to be the correct TLS index,
and what this is showing us is that we got here before anyone had
done descriptor_key_init.
I'll bet that the correct fix is
static void
set_descriptors(struct descriptor *value)
{
+ pthread_once(&descriptor_once, descriptor_key_init);
pthread_setspecific(descriptor_key, value);
}
and that you could probably reproduce this on non-Windows, too,
if you tried hard (sticking a delay in get_descriptors might do it).
regards, tom lane