Re: [libmicrohttpd] libmicrohttpd, serialized access

[Christian Grothoff]

Hi!

If you're on Linux, this is almost the case, as with a single thread
you obviously cannot have lock contention, and you're using a Futex
(http://en.wikipedia.org/wiki/Futex) -- so the cost is very close to
that of a NOP (no system call).  In fact, I would be surprised if
replacing the logic with the equivalent of "if (! (daemon->options &
MHD_USE_SELECT_INTERNALLY)) lock()" would give you any speed-up (it'd
still technically be a branch and not a real NOP).

Anyway, if you have a different reason for asking (other than
performance concerns) or have real data showing that there is a
difference, please explain more and I'll be happy to listen.

Happy hacking!

Christian

On 06/27/2014 11:18 AM, Martin Velek wrote:
> Hello,
> 
> I am using libmicrohttpd with the MHD_USE_SELECT_INTERNALLY flag only
> (one thread). Every request is processed in the libmicrohttpd thread
> and neither MHD_Connection * nor MHD_Response * are processed outside
> the thread.
> 
> Is it possible to make all pthread_mutex_* calls as no-ops?
> 
> Martin
>

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