[gnutls-devel] GnuTLS | Support post-handshake reauthentication in the Guile bindings (!1026)

[Development of GNU's TLS library]

Tim Rühsen started a new discussion on guile/src/core.c: https://gitlab.com/gnutls/gnutls/merge_requests/1026#note_180530266

>    const fill_port_data_t *args = (fill_port_data_t *) data;
>  
>    c_port = args->c_port;
> -  result = gnutls_record_recv (args->c_session,
> -                               c_port->read_buf, c_port->read_buf_size);
> +
> +  do
> +    result = gnutls_record_recv (args->c_session,
> +				 c_port->read_buf, c_port->read_buf_size);
> +  while (result == GNUTLS_E_AGAIN || result == GNUTLS_E_INTERRUPTED);

This may be very CPU intensive when e.g. when socket readability isn't given. To not waste CPU / energy (and prevent possible DOS attacks), the thread could release CPU in case of GNUTLS_E_AGAIN. The POSIX function is sched_yield(), an alternative is a short sleep (which has it's caveats, e.g. unwantedly limiting bandwidth).

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