RE: [libreoffice-dev] - libreoffice 4.0 - waiting on multiple sockets

Hi Stephan,

I misspoke on Q2. It wasn't compilation error but a register error 
CannotRegisterImplementationException:loading component library failed:.
I am not sure how to debug this as same code with osl::socket registers. Do I need to link with 
certain libs?

        regcomp -register -r CalcAddinThr.rdb -c libCalcAddinThr.so
        libCalcAddinThr.so
        register component 'libCalcAddinThr.so' in registry 'CalcAddinThr.rdb' failed!
        error (CannotRegisterImplementationException): loading component library failed: 
libCalcAddinThr.so
        make: *** [regcomp.flag] Error 1

Thanks
Neeraj

-----Original Message-----
From: Stephan Bergmann [mailto:sbergman@redhat.com]
Sent: Monday, January 28, 2013 11:43 AM
To: Rai, Neeraj [ICG-MKTS]
Cc: 'libreoffice@lists.freedesktop.org'
Subject: Re: [libreoffice-dev] - libreoffice 4.0 - waiting on multiple sockets

On 01/28/2013 04:04 PM, Rai, Neeraj wrote:
> I had tried interprocess communication before and found it to be slow (12 sec vs 14ms).
> Somewhere in the docs, there was a mention that it has latency of 2ms.
> However, if you can point me to samples or provide other advise that make it as fast as 
> osl::socket, I'd be happy to switch back to it.

"Generic" UNO IPC with all its bells and whistles easily introduces more
overhead than any solution tailored to one specific use-case, but "12
sec vs 14ms" surely sounds broken.  Hard to tell what's gone wrong there
from a high-level perspective.

> Q2.  Instead of using osl::AcceptorSocket and osl::ConnectorSocket,
>          I tried to use
> #include <sys/socket.h>
> int socket = (PF_INET, SOCK_STREAM, 0);
> bind(socket, addr, addrlen);
> listen (socket, 5);
>          This would allow me use scalable epoll but I had trouble compiling it.

There should be no general reason this should not work.  (It would mean
the code is platform-specific, of course.)

> Q3.     I would like to understand more about how these threads interact with 
> connection::read/write.
>          Is there an extra thread created for me per connection ?
>            write would be called in my user thread. Is the data queued for writer thread ?
>            read is called in my user thread. Is it listening on some UNO queue to which the 
> dedicated reader thread queues data ?
>          Or did you mean that I should create a dedicated thread per connection because 
> read/write are blocking calls ?

Reading/writing are blocking operations at the OSL socket level.

Stephan