Easy Reuse across Multiple Multi Handles

Situation:
We have several threads each with their own multi handles working with
libevent. Recently we thought it'd be nice to start reusing easy handles,
as the cost of creating a new one is expensive compared to curl_easy_reset.
However something interesting happened, our connection reuse plummeted.

After curl_multi_socket_action is called we check if any requests are
complete. All easy handles paired with CURLMSG_DONE are returned to a pool
of easies to be reused. Upon being returned to the pool, if the pool is
full we do curl_easy_cleanup, otherwise curl_easy_reset. Any handle that is
reset can be used by any multi handle.

Question:
After curl_multi_info_read says a request is complete, does the easy handle
still hold the connection? Then using the easy in a different multi would
cause the connection to be closed?

Setup:
We are running libcurl 7.67 w/ c-ares 1.15.0 on Debian 9.

As always thanks for the awesome tool and taking the time to answer these
questions.
Damon

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Received on 2020-07-10