the VCL is not threadsafe. You're supposed to access it only in non-threading
mode (IE. accessing using synchronize() from within the thread). With multiple
threads accessing the VCL is even more complicated.. using mutex's or
something. Have you done all that?
Dave
Carl Jacobs <[EMAIL PROTECTED]> wrote:
THE QUESTION
Can I run two processes within a single application - the implication being
that two copies of the memory manager would be invoked - or does the second
process have to be a seperate application?
WHY I'M ASKING
I already write multi-threaded programs, but I seem to be running into a
problem with the memory management unit in Delphi - like maybe somehow my
program is confusing the memory manager. The evidence of it is that the
programs will crash with access violation and pointer not defined errors on
lines like the following:
procedure SomeProc;
var
s : string;
{ other variables defined in here }
begin
{ other code }
s := Format('%d',[var]); <-- Sometimes crash on this sort of line, with s
being the problem!
{ other code }
StringGrid.Cells[x,y] := 'Some String'; <-- Sometimes crash on this sort of
line with the StringGrid Cell reference being invalid, even though the indexes
are within the colum and row count!
{ other code }
end;
I have multiple threads running which are performing lots of string
manipulation - with those strings being passed around between the different
threads. The strings/cells as defined and used in the code example above does
not normally bear any relationship to the strings being passed around by the
threads - except of course that the same memory manager is being used to
allocate and free those strings.
What is more suspicious is that I can run my program (a simulator of sorts) at
different speeds (normal speed, x2, x3 up to x10) and the problem will only
show up at the higher speeds - hence a greater probability of overlapping
memory management.
Does this explanation of my problem even make sense?
I look forward to any help that can be given.
Regards,
Carl.
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