Re: [Ocamlnet-devel] NetHTTPd/Netplex subtasking

[Pierre-Alexandre V. <ont...@gm...>]

I followed one of the simpler example (don't remember which one), in fact,
my app starts with this code :

let start handlers =
  let (option_list, cmdline_infos) = Netplex_main.args() in
(*  .... cut ... *)
 let nethttpd_factory =  Nethttpd_plex.nethttpd_factory  ~handlers:handlers
() in
  Netplex_main.startup  ( Netplex_mp.mp ~keep_fd_open:true () )
    Netplex_log.logger_factories
    Netplex_workload.workload_manager_factories
    [ nethttpd_factory ]
   cmdline_infos

Normally, only the threads will use the object.
Because of my inability to user shared memory, I don't have any byte of
global memory in this software (I use Memcache for that)

So, if i start a thread and return the string result, is there a risk that
the processes is killed by the master process before the thread finish his
job (In theory not) ?

2013/1/10 Gerd Stolpmann <in...@ge...>

> Am Donnerstag, den 10.01.2013, 13:19 +0100 schrieb Pierre-Alexandre
> Voye:
>
> >
> > Can I use a thread without risk ?
>
> Normally, yes, if you ensure that library functions do not "see" that
> there are several threads, i.e. any object is only used by one thread at
> a time. There are normally no mutexes controlling parallel access
> built-in (except where described). There are also no global variables
> making multi-threading impossible (and if so, there are mutexes around
> them).
>
> I must admit that I do not exactly understand your architectural
> problem. What I've got is that
>
>  - You get a request via Nethttpd
>  - You call your service routine via the CGI-style interface
>  - that routine computes the result to return via CGI
>  - but that routine also needs to do some side work that is
>    not needed for the CGI return value, and could be run
>    outside the strict HTTP request/response cycle
>
> The answer to the question how you can run such side work depends very
> much on how you deploy Nethttpd. Do you use the Netplex containers, or
> did you follow one of the simpler examples?
>
> Gerd
>
>
>
> --
> ------------------------------------------------------------
> Gerd Stolpmann, Darmstadt, Germany    ge...@ge...
> Creator of GODI and camlcity.org.
> Contact details:        http://www.camlcity.org/contact.html
> Company homepage:       http://www.gerd-stolpmann.de
> *** Searching for new projects! Need consulting for system
> *** programming in Ocaml? Gerd Stolpmann can help you.
> ------------------------------------------------------------
>
>


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