Curl keeps an internal DNS cache that's global. I'm guessing you need
to register mutex callbacks (see CURLSHOPT_LOCKFUNC and
CURLSHOPT_UNLOCKFUNC).

If you use SSL/TLS and OpenSSL, don't forget to call
CRYPTO_set_id_callback and CRYPTO_set_locking_callback.

-Costa
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Received on 2010-08-27