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Mailing lists / lazarus / 2015-11
Event created by program logic rather than user
3 messages · 3 people ·
- Engelbert Buxbaum 1
- Lukasz Sokol 1
- Michael Schnell 1
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Engelbert Buxbaum wrote 6 lines
as far as I can see the only advantage of running the math-routine in
a thread
would be that the program could be terminated at any time, rather than
only
in the main loop.
If a long winding calculation runs in a Thread, the complete main thread (including the GUI) is not blocked and the program can do any other stuff (e.g. as a reaction on TTimer events, and also as a reaction on Events this or any other thread fires via TThread.Queue).
Moreover on a multi-CPU system (which is standard nowadays), multiple threads can do long winding calculations at the same time and finish by far faster than a single threaded program.
Even if one did it like that, the original problem remains: who is the sender in the FormPaint call?
As any GUI stuff is only allowed in the main thread it can only be the Main thread (if this is what you are asking)
-Michael
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Michael Schnell wrote 11 lines
On 11/10/2015 01:14 PM, Engelbert Buxbaum wrote:
>
> as far as I can see the only advantage of running the math-routine
> in a thread would be that the program could be terminated at any
> time, rather than only in the main loop.
If a long winding calculation runs in a Thread, the complete main
thread (including the GUI) is not blocked and the program can do any
other stuff (e.g. as a reaction on TTimer events, and also as a
reaction on Events this or any other thread fires via
TThread.Queue).
I'd just add, but,
Moreover on a multi-CPU system (which is standard nowadays), multiple threads can do long winding calculations at the same time and finish by far faster than a single threaded program.
- this, only if the calculation itself is possible to be multithreaded (e.g. formula possible to calculate in chunks/portions/arbitrary bounds etc).
Show quoted text 9 lines
>
> Even if one did it like that, the original problem remains: who is
> the sender in the FormPaint call?
As any GUI stuff is only allowed in the main thread it can only be
the Main thread (if this is what you are asking)
-Michael
el es