As per #738, there are usecases where the DNS TXT record strings should
not be concatenated like RFC 7208 indicates. We cannot break ABI with
those using the new API, so we need to support retrieving the
concatenated version as well as a new API to retrieve the individual
strings which will be used by `ares_parse_text_reply_ext()` to restore
the old behavior prior to c-ares 1.20.
Fixes Issue: #738
Fix By: Brad House (@bradh352)
c-ares does not have any concept of thread-safety. It has always been 100% up to the implementor to ensure they never call c-ares from more than one thread at a time. This patch adds basic thread-safety support, which can be disabled at compile time if not desired. It uses a single recursive mutex per channel, which should be extremely quick when uncontested so overhead should be minimal.
Fixes Bug: #610
Also sets the stage to implement #611
Fix By: Brad House (@bradh352)
Brad House
Gregor Jasny