The TAsyncProcess option set in the test code below executes and terminates without leaving a zombie process, but the OnTerminate event never fires. I've tried a variety of options including just [poUsePipes,poStderrToOutPut] but have yet to see the OnTerminate event.

Have I set up this component correctly, or is this a bug?

Thanks,

-Tom

------------
Procedure Tform1.Formcreate(Sender: Tobject);
Begin
  ;
  ;
  Asyncprocess1.Options:=Asyncprocess1.Options+[poWaitOnExit,poUsePipes,poStderrToOutPut,poNoconsole,poNewProcessGroup];
End;
Procedure Tform1.Button1click(Sender: Tobject);
Begin
  with Asyncprocess1 do
  begin
    commandline:='ls -la';
    currentdirectory:='/tmp';
    execute
  end;
End;
Procedure Tform1.Readprocdata(Sender: Tobject);
begin
  with sender as TAsyncProcess do
  begin
    edit1.text:=inttostr(NumBytesAvailable);
    Memo1.Lines.LoadFromStream(OutPut);
  end
End;
Procedure Tform1.Procterminate(Sender: Tobject);
Begin
  edit2.text:='async done';
End;

What Widgetset are you using?

You should not use poWaitOnExit because that basically destroys the idea of asynchronous ;-).

Micha

I'm using the default gtk on Linux and an svn from Sept 14th.

You should not use poWaitOnExit because that basically destroys the idea of asynchronous ;-).

I would agree if OnTerminate was working... otherwise how does the app know that the async process has completed? :)

I've also noticed that without poWaitOnExit, the processes die and leave zombies in the process tree:

root 2356 0.0 0.0 0 0 ? Z 12:09 0:00 [ls] <defunct> root 2357 0.0 0.0 0 0 ? Z 12:09 0:00 [ls] <defunct> root 2358 0.0 0.0 0 0 ? Z 12:09 0:00 [ls] <defunct> root 2359 0.0 0.0 0 0 ? Z 12:09 0:00 [ls] <defunct>

I haven't decided if I can live with this in the final version and may have to give up on the async feature. Although zombies are harmless, hundreds of them attached to the Lazarus parent may look a little scary to tech aware end users.

The zombies are a minor issue, however. Knowing when the async process terminates is the part of the puzzle I don't have as yet.

Thanks for the reply.

-Tom

Ah you also need to:

Index: interfaces/gtk/gtkdefines.inc
=================================================================== --- interfaces/gtk/gtkdefines.inc (revision 14070) +++ interfaces/gtk/gtkdefines.inc (working copy) @@ -10,7 +10,7 @@

  {$IFNDEF DisableAsyncProcess}
    {$IFDEF Linux}
      {$IFDEF CPUI386}

- {off $DEFINE UseAsyncProcess}
+ {$DEFINE UseAsyncProcess}

      {$ENDIF}
    {$ENDIF}
  {$ENDIF}

Micha

That fixed both issues... OnTerminate is firing and I can turn off poWaitOnExit without seeing zombies in the process tree.

Thanks Micha!

-Tom

Small remaining problem. :)

- {off $DEFINE UseAsyncProcess} + {$DEFINE UseAsyncProcess}

The executable works perfectly, but since making this change, gdb seems to terminate immediately when trying to run the app in the IDE. Same behavior with the older gtk default from Sept 14th and the nice looking gtk2 svn as of yesterday. If I back out the change, the debugger works again.

Thanks,

-Tom