[fpc-devel] "Signals"

[Sven Barth]

Am 26.09.2014 10:58 schrieb "Michael Van Canneyt" <michael at freepascal.org>:
>
>
>
> On Fri, 26 Sep 2014, Martin Schreiber wrote:
>
>> On Friday 26 September 2014 10:38:36 Michael Van Canneyt wrote:
>>>>
>>>> Again have a look at MSEgui, tobjectlinker in mseclasses.pas. It is not
>>>> so easy to implement as it seems. ;-)
>>>
>>>
>>> It is. Depends on your definition of difficult, of course.
>>>
>> Or the implemented functionality.
>
>
> Absolutely. A signaling mechanism, synchronous, is not hard.
>
> If you want asynchronous, or if you want the signal executed in the
context of a thread in case of multiple threads, that is another matter.
>
> Although I am having difficulty seeing how you would decide which signal
must be executed in what thread... an object does not automatically belong
to a thread...

In Qt it does. Each QObject has a thread it is owned by and thus the signal
handling mechanism knows to which thread to queue to deliver a signal to a
certain object.

Regards,
Sven
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