> Does this patch fix Multi-threading problems on OSX 10.6 even if c-ares is
> being used?

This will probably not fix your problems unless you were compiling
libcurl with --disable-ipv6.

As I've integrated libcurl into a multi-threaded program, I've found
I've had to do a couple things to ensure thread safety:
  * when I create a curl object in a thread (e.g. multi handle, easy
handle), I only use it and destroy it in that thread
  * Add locking callbacks so that the DNS hostcache is thread safe:

    curl_share_setopt(g_sh, CURLSHOPT_SHARE, CURL_LOCK_DATA_DNS);
    curl_share_setopt(g_sh, CURLSHOPT_LOCKFUNC, sh_lock);
    curl_share_setopt(g_sh, CURLSHOPT_UNLOCKFUNC, sh_unlock);

  * Use CRYPTO_set_locking_callback to register a lock callback with
OpenSSL so OpenSSL is thread safe.

What sort of problems are you running into?

-Costa
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Received on 2009-11-08