Re: [Libevent-users] bufferevent_base_set and threads

[Azat Khuzhin <azat@xxxxxxxxxxxx>]

On Mon, Aug 12, 2019 at 02:04:00PM -0700, Scott Dorr wrote:
> As an addendum to that question:  if I have an SSL connection with a bufferevent, and I bufferevent_disable / bufferevent_free, can another thread bufferevent_openssl_socket_new() using the original fd to create a new bufferevent for that thread … without killing the underlying connection?

In general if you do not use BEV_OPT_CLOSE_ON_FREE this *may work*,
*may* because SSL_* functions will be called twice (i.e.
SSL_clear()/SSL_do_handshake()), but even taking this into account, I
wouldn't recommend going this way, since this:
- can be broken in future
- may not work always, and will introduce hard to debug issues

> I don’t mind a disable/base_set/enable if that’ll work with a bufferevent originally created via bufferevent_openssl_socket_new(), and that would be the easiest thing for me to do here, but if that doesn’t work, is the above (disable/free … other thread creates an explicitly new bufferevent) doable without killing the established connection underneath?


> > On Aug 12, 2019, at 1:03 PM, Scott Dorr <j.scott.dorr@xxxxxxxxx> wrote:
> > 
> > So, not possible for bufferevent_openssl_socket_new()?

Right now - no, but it is pretty easy to archive.

But you can check this debug tree:
  https://github.com/azat/libevent bufferevent_base_set
(this should work, but should be verified/covered)

Regards,
Azat.
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