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Previously, dns_dispatch_gettcp() could pick a TCP connection created by
different thread - this breaks our contractual promise to DNS dispatch
by using the TCP connection on a different thread than it was created.
Add .tid member to the dns_dispatch_t struct and skip the dispatches
from other threads when looking up a TCP dispatch that we can reuse in
dns_request.
NOTE: This is going to be properly refactored, but this change could be
also backported to 9.18 for better stability and thread-affinity.
(cherry picked from commit
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| bind9 | ||
| dns | ||
| irs | ||
| isc | ||
| isccc | ||
| isccfg | ||
| ns | ||
| .gitignore | ||
| Makefile.am | ||