Re: [Lazarus] TFPTimer, Linux
On 17/01/14 15:21, Antonio Fortuny wrote: Le 17/01/2014 16:02, Lukasz Sokol a écrit : Hello Antonio, Do you care (enough) to share ? :) Absolutely not: I'm just thinking that some FPC specialists over there could even enhance it. Just tell me how and where (I already have an access to the wiki pages on update) You could maybe prepare the page layout and I'll fill in details, code and explanations. I'm not (yet) a specialist on page publications but I guess I'll become one in a short period of time. I think you could just copy some other pages' layout / see how other interesting pages are built and create new page similarly, or add this to an existing page about timers if any; That's all I ever did on the Wiki really. Any way you'll do that, will be an improvement :) -L. timer code [even if it's just a recipe] Full code, no problem. and [minimal] example? Maybe on the wiki ? OK Antonio. -L Michael. -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] TFPTimer, Linux
DaemonApp works using threads. TFPTimer is not usable in threads other than the main thread. Right. So I made my own Timer based on the TFPTimer. Almost the same code except that the Synchronize(@EventProc) disapeared in my code and the EventProc is called immediately. Another little feature is that the high level enable disable sequences do not kill the thread: using a TEvent and some lines of cole solves this problem whithout requiqring lots of CPU processing time. Even in in the worst case the thread will respond within 500 ms Yes, I know, but what if more than one thread calls the same procedure ? Well, it is not even protected by a critical section because based on a single rule: one Timer one procedure, nothing less nothing more. As a consequence I consider that the event procedure is part of the Timer object but only connected at runtime. In a test GUI application, my timer runs perfect in a multi-threaded environment (one timer, one thread embedded into an object). My only little disappointment is that the timer precision goes from -5 to +5 ms. But this doesn't bother me as my timers deal with tens (and more hundreds) of ms. So I consider that this little error isn't worth writing of code to get rid of it. I don't think that the world will stop turning around itself because a lack of 5 ms. Antonio; Michael. -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus --- Ce courrier électronique ne contient aucun virus ou logiciel malveillant parce que la protection avast! Antivirus est active. http://www.avast.com -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] TFPTimer, Linux
On 17/01/14 14:56, Antonio Fortuny wrote: DaemonApp works using threads. TFPTimer is not usable in threads other than the main thread. Right. So I made my own Timer based on the TFPTimer. Almost the same code except that the Synchronize(@EventProc) disapeared in my code and the EventProc is called immediately. Another little feature is that the high level enable disable sequences do not kill the thread: using a TEvent and some lines of cole solves this problem whithout requiqring lots of CPU processing time. Even in in the worst case the thread will respond within 500 ms Yes, I know, but what if more than one thread calls the same procedure ? Well, it is not even protected by a critical section because based on a single rule: one Timer one procedure, nothing less nothing more. As a consequence I consider that the event procedure is part of the Timer object but only connected at runtime. In a test GUI application, my timer runs perfect in a multi-threaded environment (one timer, one thread embedded into an object). My only little disappointment is that the timer precision goes from -5 to +5 ms. But this doesn't bother me as my timers deal with tens (and more hundreds) of ms. So I consider that this little error isn't worth writing of code to get rid of it. I don't think that the world will stop turning around itself because a lack of 5 ms. Antonio; Hello Antonio, Do you care (enough) to share ? :) timer code [even if it's just a recipe] and [minimal] example? Maybe on the wiki ? -L Michael. -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] TFPTimer, Linux
Le 17/01/2014 16:02, Lukasz Sokol a crit: Hello Antonio, Do you care (enough) to share ? :) Absolutely not: I'm just thinking that some FPC specialists over there could even enhance it. Just tell me how and where (I already have an access to the wiki pages on update) You could maybe prepare the page layout and I'll fill in details, code and explanations. I'm not (yet) a specialist on page publications but I guess I'll become one in a short period of time. timer code [even if it's just a recipe] Full code, no problem. and [minimal] example? Maybe on the wiki ? OK Antonio. -L Michael. -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus -- Antonio Fortuny Senior Software engineer 220, avenue de la Libert L-4602 Niederkorn Tel.: +352 58 00 93 - 93 www.sitasoftware.lu Ce courrier électronique ne contient aucun virus ou logiciel malveillant parce que la protection Antivirus avast! est active. -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
[Lazarus] TFPTimer, Linux
Hi Folks.
Following a Michael advice I changed a TTimer by an TFPTime component in
a Linux daemon application but the latter doesn't work.
There is the code snippet of the TFPTime OnTimer event:
procedure TDaemon1.ThreadControlTimerTimer(Sender: TObject);
var
Res: Boolean;
begin
// se réveille toutes les 10 secondes pour vérifier l'état du thread
FLog.Add(9, '1', esError);
try
FLog.Add(9, '2', esError);
except
on E: Exception do begin
FLog.Error(Format('+++ error on log control thread:%s',
[E.Message]));
Res := False;
end;
end;
FLog.Add(9, '3', esError);
try
FLog.Add(9, '4', esError); - this line appears
into the log file
ThreadControlTimer.Enabled := False;
FLog.Add(9, '5', esError); === this line is never reached
Res := DoThreadControl;
FLog.Add(9, '6', esError);
except
on E: Exception do begin
FLog.Error(Format('+++ error on control thread:%s', [E.Message]));
Res := False;
end;
end;
if Res then begin
FLog.Add(9, '7 True', esError);
ThreadControlTimer.Enabled := True;
end else begin
FLog.Add(9, '8 False', esError);
end;
end;
It looks like the Enabled property doesn't work and blocks the TFPTimer
in some way. The event is fired on time, but only once and never more.
I'dl be glad to know what happens.
Antonio.
---
Ce courrier électronique ne contient aucun virus ou logiciel malveillant parce
que la protection avast! Antivirus est active.
http://www.avast.com
--
___
Lazarus mailing list
Lazarus@lists.lazarus.freepascal.org
http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] TFPTimer, Linux
On Wed, 15 Jan 2014, Antonio Fortuny wrote:
Hi Folks.
Following a Michael advice I changed a TTimer by an TFPTime component in a
Linux daemon application but the latter doesn't work.
There is the code snippet of the TFPTime OnTimer event:
procedure TDaemon1.ThreadControlTimerTimer(Sender: TObject);
var
Res: Boolean;
begin
// se réveille toutes les 10 secondes pour vérifier l'état du thread
FLog.Add(9, '1', esError);
try
FLog.Add(9, '2', esError);
except
on E: Exception do begin
FLog.Error(Format('+++ error on log control thread:%s',
[E.Message]));
Res := False;
end;
end;
FLog.Add(9, '3', esError);
try
FLog.Add(9, '4', esError); - this line appears into
the log file
ThreadControlTimer.Enabled := False;
FLog.Add(9, '5', esError); === this line is never reached
Res := DoThreadControl;
FLog.Add(9, '6', esError);
except
on E: Exception do begin
FLog.Error(Format('+++ error on control thread:%s', [E.Message]));
Res := False;
end;
end;
if Res then begin
FLog.Add(9, '7 True', esError);
ThreadControlTimer.Enabled := True;
end else begin
FLog.Add(9, '8 False', esError);
end;
end;
It looks like the Enabled property doesn't work and blocks the TFPTimer in
some way. The event is fired on time, but only once and never more.
I'dl be glad to know what happens.
DaemonApp works using threads.
TFPTimer is not usable in threads other than the main thread.
Michael.--
___
Lazarus mailing list
Lazarus@lists.lazarus.freepascal.org
http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
