How I can use several threads with lNet visual library?

I need some examples.

Best regards!
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.lazarus.freepascal.org/pipermail/lazarus/attachments/20090416/260efe63/attachment.html

Hello. lNet is inheritedly not thread-safe but it can be used with threads in some ways. When it comes to the visual components, you must remember that the main program loop (handled by the widgetsets) calls the lNet callbacks (OnReceive etc.) so they are all executed inside the main thread no matter where you work with the components otherwise.

I'd need some specific use case to give more info.

Ales

Hello, I will explain better my doubt. I need to program a multithread server that processes requests of several clients at the same time. At the moment the server processes requests of several clients one to one by the OnReceive callback:

procedure TConnectionHandler.Receive(aSocket: TLSocket);
var
  Message: String;
begin
  if aSocket.GetMessage(Message) > 0 then
    MessagesManager.ProcessMessage(Message);
end;

I want to change the behavior of the server so that it works with one thread for each client request.

Is it possible?

Best regards.

2009/4/18 Ale? Katona

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.lazarus.freepascal.org/pipermail/lazarus/attachments/20090418/6438364e/attachment.html

Yes, but you need to do the sends inside the main loop. lNet is a state-machine so everything related to network states needs to be kept in the same thread. You can however start a new thread for each request and process the data there. When you have replies ready to send, push them in some send-buffer (per client) so that the main thread can do the sending then. This requires some sort of messaging between the threads of course.

It's not the simplest of methods but it's safe. Doing sending inside the work-threads could cause lNet to run into a state-change race-condition and stop working properly.

Ales

Which is the simplest method?

2009/4/18 Ale? Katona

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.lazarus.freepascal.org/pipermail/lazarus/attachments/20090418/907e70c0/attachment-0001.html

User pisze:

Which is the simplest method?

You can use synapse.It will be good for a multithreaded server if fpc thread support is stable and for just a few clients. It depends on what you want to archieve.

Boguslaw

Ok, you know some examples?

Best regards.

2009/4/18 Bogus?aw Brandys

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.lazarus.freepascal.org/pipermail/lazarus/attachments/20090418/58c3f561/attachment.html