On 8 Nov 2009, at 17:47, Constantine Sapuntzakis wrote:

>> 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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Hi Costa,

I launch a lot of connections at the same time, each easy handle is
created and destroyed
in its own pthread and it works flawlessly until I increase the number
of connections to
about 20 or above and then curl_easy_perform starts returning error 7
on all new handles.

I have been configuring libcurl with:

./configure --enable-ares

Having read your emails should I also be setting --enable-thread and --
enable-nonblocking?

Regards,

Rob.

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Received on 2009-11-08