[openssl-dev] Adding async support

[Devchandra L Meetei]

On Wed, Oct 7, 2015 at 3:16 PM, Matt Caswell <matt at openssl.org> wrote:
<https://github.com/openssl/openssl/pull/433>

>
>
> libssl has been made async aware through the introduction of a new mode
> "SSL_MODE_ASYNC". The mode is set using a call to one of the existing
> functions SSL_CTX_set_mode() or SSL_set_mode(). Having set that mode
> calls to functions such as SSL_read/SSL_write etc, may now start
> returning an SSL_ERROR_WANT_ASYNC response (if an async capable engine
> is present). To resume you simply recall SSL_read/SSL_write in the same
> way as you would if you got an SSL_ERROR_WANT_READ or
> SSL_ERROR_WANT_WRITE. Similarly to above you must do this from the same
> thread as the original call.
>

Does this also mean that there will not be any libssl API change?

I have been developing async calls of TLS I/O using bio pair, for instance
for SSL_read, it is something like

> int evt_tls_read( evt_tls_t *tls, void (*cb)(evt_tls_t* t, char *buf, int
sz))

The cb will be called asynchronously whenever there is application data.

Will there be any such change? Such API's will make integrating OpenSSL
with other
async lib like libevent, libev and libuv etc.

Please forgive me if I am asking a dumb question without looking at code
changes done.

-- 
Warm Regards
--Dev
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