> As I know, it requires one thread to be launched to execute this
> callback function, doesn't it ?

All of the callbacks can run on the same thread.

> is it expensive?
libcurl is free ;-)

> Why I would like to know more about it is cuz my application's
> threads would send requests very extensively

It sounds like you might want to look at the curl_multi_* interface.
This will probably give as good performance as multi-threading, and
is a lot easier to implement.

Check the docs/examples for curl_multi_init(), curl_multi_add_handle(),
curl_multi_perform(), and curl_multi_cleanup().

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Received on 2003-09-11