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Re: [libmicrohttpd] libmicrohttpd, serialized access

From: Christian Grothoff
Subject: Re: [libmicrohttpd] libmicrohttpd, serialized access
Date: Fri, 27 Jun 2014 11:44:40 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Icedove/24.6.0


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
( -- 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!


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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