General list for MSEide+MSEgui Pascal RAD.

IvankoB | 23 Jul 2012 13:41

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TThreadComp: is it safe to call HALT(rc) in its OnTerminate ?

Me need to have an application result code.

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IvankoB | 23 Jul 2012 13:52

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Re: TThreadComp: is it safe to call HALT(rc) in its OnTerminate ?


Also "TThreadComp.terminate" in its OnStarted so that to exit its  
OnExecute & OnTerminated on check "if terminated then exit;"
(this approach assumes errors revealed in OnStarted which should stop  
further thread running)

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Martin Schreiber | 23 Jul 2012 14:11

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Re: TThreadComp: is it safe to call HALT(rc) in its OnTerminate ?

On Monday 23 July 2012 13:52:00 IvankoB wrote:
> Also "TThreadComp.terminate" in its OnStarted so that to exit its
> OnExecute & OnTerminated on check "if terminated then exit;"
> (this approach assumes errors revealed in OnStarted which should stop
> further thread running)
>
It should be.

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Ivanko B | 23 Jul 2012 14:33

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Re: TThreadComp: is it safe to call HALT(rc) in its OnTerminate ?

Probably. There will be an immediate abort of the program without calling
 finalize routines.
====================
Which checks to perform from the thread for already not existing
widgets of main application so that to eliminate AV etc ?

2012/7/23, Martin Schreiber <mse00000@...>:
> On Monday 23 July 2012 13:52:00 IvankoB wrote:
>> Also "TThreadComp.terminate" in its OnStarted so that to exit its
>> OnExecute & OnTerminated on check "if terminated then exit;"
>> (this approach assumes errors revealed in OnStarted which should stop
>> further thread running)
>>
> It should be.
>
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(Continue reading)

Martin Schreiber | 23 Jul 2012 15:02

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Re: TThreadComp: is it safe to call HALT(rc) in its OnTerminate ?

On Monday 23 July 2012 14:33:54 Ivanko B wrote:
> Probably. There will be an immediate abort of the program without calling
>  finalize routines.
> ====================
> Which checks to perform from the thread for already not existing
> widgets of main application so that to eliminate AV etc ?
>
Probably. Although you should ask FPC if it is safe.

Martin

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IvankoB | 23 Jul 2012 14:02

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Re: TThreadComp: is it safe to call HALT(rc) in its OnTerminate ?

Which are the exact conditions of calling OnStarted, OnExecute &  
OnTerminated ? Where form can me terminate, pause & kill the thread ?

PS: Since me still can't get proper threading mechanics, Me have dead lock  
in my application.

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Martin Schreiber | 23 Jul 2012 15:06

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Re: TThreadComp: is it safe to call HALT(rc) in its OnTerminate ?

On Monday 23 July 2012 14:02:02 IvankoB wrote:
> Which are the exact conditions of calling OnStarted, OnExecute &
> OnTerminated ? Where form can me terminate, pause & kill the thread ?
>

"
function tthreadcomp.threadproc(sender: tmsethread): integer;
begin
 fthread:= teventthread(sender);
 try
  if assigned(fonstart) then begin
   application.lock;
   try
    fonstart(self);
   finally
    application.unlock;
   end;
  end;
  if assigned(fonexecute) then begin
   fonexecute(self);
  end;
  if assigned(fonterminate) then begin
   application.lock;
   try
    fonterminate(self);
   finally
    application.unlock;
   end;
  end;
  result:= 0;

(Continue reading)

Martin Schreiber | 23 Jul 2012 20:11

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Re: TThreadComp: is it safe to call HALT(rc) in its OnTerminate ?

On Monday 23 July 2012 15:06:16 Martin Schreiber wrote:
> On Monday 23 July 2012 14:02:02 IvankoB wrote:
>
> > PS: Since me still can't get proper threading mechanics, Me have dead
> > lock in my application.
>
> This is normal while working with threaded applications. 
>
Or
Welcome in multi thread world! 

Martin

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Sieghard | 23 Jul 2012 20:57

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Re: TThreadComp: is it safe to call HALT(rc) in its OnTerminate ?

Hallo IvankoB,

Du schriebst am Mon, 23 Jul 2012 17:02:02 +0500:

> PS: Since me still can't get proper threading mechanics, Me have dead
> lock in my application.

Did you make sure that all ressources are reserved strictly in the sme
order everywhere they're used? Requesting ressources in varying order is a
sure method to create deadlocks:

   A: request Ra, request Rb
   B: request Rb, request Ra

If the order of processing is A:Ra, B:Rb, then you have it.
Try it with B reqesting the other way, and see if you can create a deadlock
that way. Then you can proceed to more complex scenarios.  

--

-- 
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-----------------------------------------------------------
Mit freundlichen Grüßen, S. Schicktanz
-----------------------------------------------------------

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Ivanko B | 23 Jul 2012 22:37

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Re: TThreadComp: is it safe to call HALT(rc) in its OnTerminate ?

Set the global
 variable "ExitCode" and  set application.terminated to true.
=================
This looks as a solution.

2012/7/23, Sieghard <s_c_h_s@...>:
> Hallo IvankoB,
>
> Du schriebst am Mon, 23 Jul 2012 17:02:02 +0500:
>
>> PS: Since me still can't get proper threading mechanics, Me have dead
>> lock in my application.
>
> Did you make sure that all ressources are reserved strictly in the sme
> order everywhere they're used? Requesting ressources in varying order is a
> sure method to create deadlocks:
>
>    A: request Ra, request Rb
>    B: request Rb, request Ra
>
> If the order of processing is A:Ra, B:Rb, then you have it.
> Try it with B reqesting the other way, and see if you can create a deadlock
> that way. Then you can proceed to more complex scenarios.  
>
> --
> (Weitergabe von Adressdaten, Telefonnummern u.ä. ohne Zustimmung
> nicht gestattet, ebenso Zusendung von Werbung oder ähnlichem)
> -----------------------------------------------------------
> Mit freundlichen Grüßen, S. Schicktanz
> -----------------------------------------------------------

(Continue reading)

Ivanko B | 23 Jul 2012 22:57

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Re: TThreadComp: is it safe to call HALT(rc) in its OnTerminate ?

Which are conditions of terminating (finishing) thread ?

2012/7/24, Ivanko B <ivankob4mse2@...>:
> Set the global
>  variable "ExitCode" and  set application.terminated to true.
> =================
> This looks as a solution.
>
> 2012/7/23, Sieghard <s_c_h_s@...>:
>> Hallo IvankoB,
>>
>> Du schriebst am Mon, 23 Jul 2012 17:02:02 +0500:
>>
>>> PS: Since me still can't get proper threading mechanics, Me have dead
>>> lock in my application.
>>
>> Did you make sure that all ressources are reserved strictly in the sme
>> order everywhere they're used? Requesting ressources in varying order is
>> a
>> sure method to create deadlocks:
>>
>>    A: request Ra, request Rb
>>    B: request Rb, request Ra
>>
>> If the order of processing is A:Ra, B:Rb, then you have it.
>> Try it with B reqesting the other way, and see if you can create a
>> deadlock
>> that way. Then you can proceed to more complex scenarios.  
>>
>> --

(Continue reading)

Martin Schreiber | 24 Jul 2012 05:33

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Re: TThreadComp: is it safe to call HALT(rc) in its OnTerminate ?

On Monday 23 July 2012 22:57:43 Ivanko B wrote:
> Which are conditions of terminating (finishing) thread ?
>
Exiting onexecute.

Martin

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IvankoB | 24 Jul 2012 10:05

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Re: TThreadComp: is it safe to call HALT(rc) in its OnTerminate ?

Strangely but the below code doesn't redraw the label if called from  
OnTerminate
(checked for sure that the program flow enters this code)
//-------------------------------------------

begin
//application.lock;
try
   {выйти из программы по завершении sender.OnExecute}
   case RESULTCODETY(ExitCode) of
     SUCCESS: begin
       lblFinStatus.caption:= 'Завершено успешно.';
       lblFinStatus.color:= cl_ltgreen;
     end;
     CANCELLED: begin
       lblFinStatus.caption:= 'Отменено.';
       lblFinStatus.color:= cl_ltblue;
     end
     else {FAILED}
       lblFinStatus.caption:= 'Произошла ощибка.';
       lblFinStatus.color:= cl_ltred;
   end;
finally
//  application.unlock;
end;
waitus(1000000);

//-------------------------------------------

but does it successfully if called at end of OnExecute.

(Continue reading)

Martin Schreiber | 24 Jul 2012 10:23

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Re: TThreadComp: is it safe to call HALT(rc) in its OnTerminate ?

On Tuesday 24 July 2012 10:05:16 IvankoB wrote:
> Strangely but the below code doesn't redraw the label if called from
> OnTerminate
> (checked for sure that the program flow enters this code)
> //-------------------------------------------
>
> begin
> //application.lock;
> try
>    {выйти из программы по завершении sender.OnExecute}
>    case RESULTCODETY(ExitCode) of
>      SUCCESS: begin
>        lblFinStatus.caption:= 'Завершено успешно.';
>        lblFinStatus.color:= cl_ltgreen;
>      end;
>      CANCELLED: begin
>        lblFinStatus.caption:= 'Отменено.';
>        lblFinStatus.color:= cl_ltblue;
>      end
>      else {FAILED}
>        lblFinStatus.caption:= 'Произошла ощибка.';
>        lblFinStatus.color:= cl_ltred;
>    end;
> finally
> //  application.unlock;
> end;

Application is locked here (onterminate is called in locked state).

> waitus(1000000);

(Continue reading)

Martin Schreiber | 23 Jul 2012 14:08

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Re: TThreadComp: is it safe to call HALT(rc) in its OnTerminate ?

On Monday 23 July 2012 13:41:35 IvankoB wrote:
> Me need to have an application result code.
>
Probably. There will be an immediate abort of the program without calling 
finalize routines.

Martin

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IvankoB | 23 Jul 2012 17:47

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Re: TThreadComp: is it safe to call HALT(rc) in its OnTerminate ?

Probably. There will be an immediate abort of the program without calling
> finalize routines.
>

Unit's "finalization" is called. But GDB still shows the apllication  
running after "halt", is it correct ?

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Martin Schreiber | 23 Jul 2012 17:57

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Re: TThreadComp: is it safe to call HALT(rc) in its OnTerminate ?

On Monday 23 July 2012 17:47:33 IvankoB wrote:
> Probably. There will be an immediate abort of the program without calling
>
> > finalize routines.
>
> Unit's "finalization" is called. But GDB still shows the apllication
> running after "halt", is it correct ?
>
I don't know.

Martin

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Ivanko B | 23 Jul 2012 19:52

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Re: TThreadComp: is it safe to call HALT(rc) in its OnTerminate ?

Me mean the HALT(n) call from within a thread but GDB still looks like
the main app is still running & some more inadequate "things" after
that.
How do You debug threaded apps ?

2012/7/23, Martin Schreiber <mse00000@...>:
> On Monday 23 July 2012 17:47:33 IvankoB wrote:
>> Probably. There will be an immediate abort of the program without calling
>>
>> > finalize routines.
>>
>> Unit's "finalization" is called. But GDB still shows the apllication
>> running after "halt", is it correct ?
>>
> I don't know.
>
> Martin
>
> ------------------------------------------------------------------------------
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> _______________________________________________
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> https://lists.sourceforge.net/lists/listinfo/mseide-msegui-talk
>

(Continue reading)

Martin Schreiber | 23 Jul 2012 20:11

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Re: TThreadComp: is it safe to call HALT(rc) in its OnTerminate ?

On Monday 23 July 2012 19:52:50 Ivanko B wrote:
> Me mean the HALT(n) call from within a thread but GDB still looks like
> the main app is still running & some more inadequate "things" after
> that.

Can you step into the halt() call?

> How do You debug threaded apps ?
>
Open the thread window, select the thread you want to debug. Linux gdb works 
better for debugging threads then the Windows version. 
Sometimes 'Project'-'Options'-'Call GUI_DEBUGBEGIN/GUI_DEBUGEND must be 
activated in order to prevent gdb crashes.

Martin

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Ivanko B | 23 Jul 2012 20:26

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Re: TThreadComp: is it safe to call HALT(rc) in its OnTerminate ?

Can you step into the halt() call?
=========
Hmm...me don't have actual FPC sources at that machine.

Welcome in multi thread world! 
=========
Too much new - up to overloading my brain :) Threading, SSL|Crypto,
networking, HTTP, archiving,..

2012/7/23, Martin Schreiber <mse00000@...>:
> On Monday 23 July 2012 19:52:50 Ivanko B wrote:
>> Me mean the HALT(n) call from within a thread but GDB still looks like
>> the main app is still running & some more inadequate "things" after
>> that.
>
> Can you step into the halt() call?
>
>> How do You debug threaded apps ?
>>
> Open the thread window, select the thread you want to debug. Linux gdb works
>
> better for debugging threads then the Windows version.
> Sometimes 'Project'-'Options'-'Call GUI_DEBUGBEGIN/GUI_DEBUGEND must be
> activated in order to prevent gdb crashes.
>
> Martin
>
> ------------------------------------------------------------------------------
> Live Security Virtual Conference
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Martin Schreiber | 23 Jul 2012 20:52

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Re: TThreadComp: is it safe to call HALT(rc) in its OnTerminate ?

On Monday 23 July 2012 20:26:00 Ivanko B wrote:
> Can you step into the halt() call?
> =========
> Hmm...me don't have actual FPC sources at that machine.
>
I would not call halt() in a running application. Set the global 
variable "ExitCode" and  set application.terminated to true.

Martin

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IvankoB | 24 Jul 2012 11:38

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Re: TThreadComp: is it safe to call HALT(rc) in its OnTerminate ?

>> How do You debug threaded apps ?
>>
> Open the thread window, select the thread you want to debug. Linux gdb  
> works
> better for debugging threads then the Windows version.
> Sometimes 'Project'-'Options'-'Call GUI_DEBUGBEGIN/GUI_DEBUGEND must be
> activated in order to prevent gdb crashes.
>

For evil apps it also good to restart GDB after app run :)
( todays' experience )

PS: ExitCode+Terminate work excellent.

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