[openssl-users] Openssl asynchronous operation in real network

[Ananthu Unnikrishnan]

Hi Matt,

        Thanks a lot for the reply.

       After calling ASYNC_pause_job() from the engine, control will
transfer to the place where we start the ASYNC_start_job right? So how can
we write the code to put a trigger on fd in the same thread? If I am wrong
please correct me. Also if u can suggest where resume operation should be
done, it would be helpful.

On Thu, Jan 10, 2019 at 10:11 PM Matt Caswell <matt at openssl.org> wrote:

>
>
> On 10/01/2019 09:39, Ananthu Unnikrishnan wrote:
> > Hi all,
> >
> >         We are not able to access the waitctx address from the job
> address using
> > ASYNC_get_wait_ctx(job) from a thread which starts in the bind section
> of the
> > dynamic engine. The job address is the same as that we got
> > using ASYNC_get_current_job.  Can anyone help on this?
>
> It's very unclear from the your various emails what you are trying to
> achieve
> and the problem that you are experiencing.
>
> From the above it sounds like you are starting threads from inside your
> dynamic
> engine? ASYNC_JOBs are always local to a thread. When a job is started it
> is
> associated with the current thread. So ASYNC_get_current_job() returns the
> job
> associated with the current thread. Similarly if you pause a job,
> ASYNC_pause_job() must be called from that same thread. Finally if you
> restart a
> paused job it must also be restarted on the same thread.
>
> If you are starting new threads from within your engine then extreme care
> must
> be taken to obey the above rules - otherwise you are likely to get strange
> results.
>
> Matt
>
>
> >
> >
> >
> > On Tue, Jan 8, 2019 at 11:26 AM Ananthu Unnikrishnan <
> ananthuu741 at gmail.com
> > <mailto:ananthuu741 at gmail.com>> wrote:
> >
> >     Can anyone please help on this? If u need any additional information
> please
> >     let me know.
> >
> >     On Mon, Jan 7, 2019 at 6:25 PM Ananthu Unnikrishnan <
> ananthuu741 at gmail.com
> >     <mailto:ananthuu741 at gmail.com>> wrote:
> >
> >         Hi all,
> >
> >         Adding more details to the previous mail. We have edited the
> OpenSSL
> >         code for implementing the polling for changed fd's as in OpenSSL
> speed
> >         command. Attached the code snippet of the same along with this
> mail.
> >         Mentioned below some observations which found doubtful:
> >
> >         1) We have got prints in ASYNC_FINISH case, before getting print
> in
> >         ASYNC_PAUSE case. Attaching the log also, so you can understand
> easily.
> >         2) Shown below the code snippet which we have written to provide
> a write
> >         on fd.
> >
> >         if ((waitctx = ASYNC_get_wait_ctx((ASYNC_JOB *)job)) == NULL) {
> >                 printf("In dynamic engine | waitctx == NULL : %d\n",
> __LINE__);
> >                 return ret;
> >             }
> >
> >             printf("\n----- In dynamic engine | After pausing | job is
> %lx |
> >         waitctx in resume job %lx |-----\n", job, waitctx);
> >
> >                 if ((ret = ASYNC_WAIT_CTX_get_fd(waitctx, engine_id,
> &efd,
> >                                       &custom)) > 0) {
> >                 if (write(efd, &buf, sizeof(uint64_t)) == -1) {
> >                     printf("\nFailed to write\n");
> >                 }
> >             }
> >
> >         Here waitctx is getting NULL when we tried to fetch waitctx using
> >         ASYNC_get_wait_ctx(). We have printed data of sizeof(ASYNC_JOB)
> ie.1176
> >         bytes contained in the job address from the engine,  we got
> correct data
> >         before calling ASYNC_pause() and but got half data zero data
> when we
> >         tried to access the same address after ASYNC_pause().
> >
> >         Attaching both job structure contents before and after calling
> >         ASYNC_pause(). Also, we got the correct data in the same address
> when we
> >         have printed from ssl_start_async_job() before polling starts,
> where we
> >         have started the async_job
> >         .
> >         The prints starting with "In dynamic engine" are prints inside
> the
> >         engine, rest prints are from ss/ssl_lib.c. Kindly check this and
> please
> >         point out if anything is wrong somewhere. Thanks in advance.
> >
> >
> >         On Sun, Jan 6, 2019 at 10:30 AM Ananthu Unnikrishnan
> >         <ananthuu741 at gmail.com <mailto:ananthuu741 at gmail.com>> wrote:
> >
> >             Hi all,
> >
> >                    We have implemented a dynamic engine and tested in
> the async
> >             mode using OpenSSL speed command. But in a real network
> scenario, we
> >             have seen only starting the async_job(in file ssl/ssl_lib.c,
> >             function: ssl_start_async_job) in the OpenSSL. We haven't
> seen
> >             polling async_fd's for resuming the job as in
> apps/speed.c(in speed
> >             command case).
> >                     So can anyone please suggest any solution for
> resuming the
> >             async_jobs in real network scenario? Thanks in advance.
> >
> >
> >
> >
> >
> >         --
> >         With best Regards,
> >
> >                  Ananthu
> >
> >
> >
> >
> >     --
> >     With best Regards,
> >
> >              Ananthu
> >
> >
> >
> >
> > --
> > With best Regards,
> >
> >          Ananthu
> >
> >
> >
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>


-- 
With best Regards,

         Ananthu
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