[fpc-devel] procedure ... message(); in Linux

Michael Schnell mschnell at lumino.de
Fri Feb 19 12:27:16 CET 2010

On 02/18/2010 10:16 PM, Nikolai Zhubr wrote:
> ...  if you are going to make this messaging work to some degree in
> non-main thread on windows, you'll probably need to take care of some
> things manually. 

Of course you are right that the Delphi / Windows paradigm only allows
for a single message queue and same is dedicated to the main thread as a
receiver. Lazarus / Windows uses the same algorithm as Delphi. Lazarus /
Linux reproduces the same behavior with a different algorithm. For now,
the NoGUIApplication Lazarus package I am planning, is suppose to
reproduce this behavior, too, with a home-brew message queue. For the
future I think about having the home-brew message queue done in a way
that allows for multiple instances of same and thus allow for worker
threads to be programmed using an event-driven paradigm.

> When I ported some threaded delphi application to linux I replaced
> window handles (used for inter-thread communication) by unix pipes. 
While this of course is possible, I suppose a pure user-land algorithm
should offer better performance.
> These are not exactly the same, but generally provide sufficient
> functionality and are quite easy to use. No idea if it is anywhere
> appropriate in your case, though.
The event queue (ported form mse) already does work nicely for me (e.g.
with for timer events, TThread.Synchronize). I just wonder if supporting
procedure ... messages in the package is possible / viable / necessary.


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