[fpc-pascal] Re: Odyssey: SSockets and Threads.

Ludo Brands ludo.brands at free.fr
Thu Apr 25 08:17:04 CEST 2013

On 04/24/2013 10:21 PM, silvioprog wrote:
> 2013/4/24 silvioprog <silvioprog at gmail.com <mailto:silvioprog at gmail.com>>
>     Hello,
>     There are a multi-thread example using SSockets in FPC?
>     I'm trying to implement it*, but it's very hard and this work it's
>     consuming all my time. The difficulty is to read and write at the
>     same time. I'm almost certain that using SSockets, I would have to
>     create one socket for writing and one for reading, separately by
>     threads.
>     Thank you!
>     * https://bitbucket.org/silvioprog/tcpipcomp (this repo is
>     temporary, and this all code can undergo drastic changes at any time)
> ... like ScktComp of Delphi. (no Synapse, LNet or Indy please, I need to
> use native code)

what is the problem with using Synapse, LNet or Indy? Seen the questions
you are asking I would suggest you use an existing library and stay away
from writing your own socket library or start with learning the basics
of socket programming.

SOCK_STREAM sockets are full duplex and you can read and write
simultaneously on them, even without threading if you use non blocking
mode. SSocket has a Property NonBlocking but I don't see any code that
handles the EAGAIN or EWOULDBLOCK errors. That is probably left to the
user of TSocketStream to deal with. So SSocket is a really thin layer
that leaves the user with all the problems you are trying to solve.


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