@Vincent
thanks for your detailed reply :)
@All
Vinzent Hoefler wrote:
On Wednesday 12 July 2006 11:34, Andreas Berger wrote:
save and restore the floating point unit. I will need to do this for
FPC, so if someone knows how to save and restore the FPU, I would
apreciate the help.
F(
2006/7/12, Felipe Monteiro de Carvalho <[EMAIL PROTECTED]>:
On 7/12/06, Alexandre Leclerc <[EMAIL PROTECTED]> wrote:
> In Delphi a class is always treated as a 'var' when passed in a
> function since a class is a pointer to actual data;
No, not really. It is always passed as a pointer, but here
2006/7/12, Michael Van Canneyt <[EMAIL PROTECTED]>:
Ahem.
Have you tried that ? Because it is manifestly NOT true:
Ah! I learnd something today! You are completly correct:
What IS true is that you can change the properties of S, even if it is
passed by value or as const. But the pointer S ca
On 7/12/06, Alexandre Leclerc <[EMAIL PROTECTED]> wrote:
In Delphi a class is always treated as a 'var' when passed in a
function since a class is a pointer to actual data;
No, not really. It is always passed as a pointer, but here you want to
change the pointer and not the contents of the clas
On Wed, 12 Jul 2006, Alexandre Leclerc wrote:
I tried the following:
procedure ThisAndThat(bitmap: TBitmap);
begin
if not Assigned(bitmap) then
bitmap := TBitmap.Create;
end;
function Test: boolean;
var
bitmap: TBitmap;
begin
bitmap := nil;
ThisAndThat(bitmap);
Result := Assigned(bitmap);
2006/7/12, Michael Van Canneyt <[EMAIL PROTECTED]>:
It's not good practice to have local variables with the same name as a
public method/property. How will you tell which one is used ?
(obviously you can find out, but at first glance it will not be clear)
Well, I was always doing Self.SetName i
I tried the following:
procedure ThisAndThat(bitmap: TBitmap);
begin
if not Assigned(bitmap) then
bitmap := TBitmap.Create;
end;
function Test: boolean;
var
bitmap: TBitmap;
begin
bitmap := nil;
ThisAndThat(bitmap);
Result := Assigned(bitmap);
bitmap.Free;
end;
In Delphi a class is alw
On Wed, 12 Jul 2006, Alexandre Leclerc wrote:
2006/7/12, Michael Van Canneyt <[EMAIL PROTECTED]>:
This is not a bug.
Your code will compile in DELPHI mode, but not in FPC mode.
Ok, I do not want Delphi mode (I try never using this mode: I code in
FPC isn't it?). But as a side question, is t
2006/7/12, Michael Van Canneyt <[EMAIL PROTECTED]>:
This is not a bug.
Your code will compile in DELPHI mode, but not in FPC mode.
Ok, I do not want Delphi mode (I try never using this mode: I code in
FPC isn't it?). But as a side question, is there a reason we can't do
that in FPC? I should re
On Wed, 12 Jul 2006, Alexandre Leclerc wrote:
Hi all,
in Controls.pas there is TControl.SetName(). In a form I made a procedure
with
TMyForm.MyProcedure;
var
setName: string;
begin
//...
end;
The compiler complains about: frmMyForm.pas(467,3) Error: Duplicate
identifier "SetName"
It shou
Hi all,
in Controls.pas there is TControl.SetName(). In a form I made a procedure with
TMyForm.MyProcedure;
var
setName: string;
begin
//...
end;
The compiler complains about: frmMyForm.pas(467,3) Error: Duplicate
identifier "SetName"
It should do no problems. But If I want to use SetName of
On Wednesday 12 July 2006 11:34, Andreas Berger wrote:
> save and restore the floating point unit. I will need to do this for
> FPC, so if someone knows how to save and restore the FPU, I would
> apreciate the help.
F(X)SAVE/F(X)RSTOR
The X-Versions are more efficient, but only available on newe
On 12 jul 2006, at 13:00, Vinzent Hoefler wrote:
"sched_yield()"? Seems to be POSIX, so I suppose it's available on
most
Unices.
Indeed also exists on Mac OS X.
Jonas
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Since Dos can have multiple ways of multitasking (it could e.g. also plug in
to DV or Win3.x or TopView via int 2FH etc) this model seems advisable to me.
I assume you are implementing a basic fixed timeslicer? What are you going
to use it for btw? This because DV/X (which is free nowadays) a
On Wednesday 12 July 2006 11:10, Marco van de Voort wrote:
> > > > spinning loops on Mac OS X, so maybe sleep(0) is the same.
> > >
> > > Do you know a correct way of doing this on *nix?
> >
> > "sched_yield()"? Seems to be POSIX, so I suppose it's available on
> > most Unices.
>
> Yes, and not so
> > > spinning loops on Mac OS X, so maybe sleep(0) is the same.
> >
> > Do you know a correct way of doing this on *nix?
>
> "sched_yield()"? Seems to be POSIX, so I suppose it's available on most
> Unices.
Yes, and not so recent ('93) that it is risky. At least FreeBSD seems to have
it.
_
On Wednesday 12 July 2006 10:57, Tomas Hajny wrote:
> I certainly don't know a general solution for *nix. However, even old
> "single-task" DOS provides such a function and it's a great help that
> can be provided by programmer to scheduler in the underlying OS, so
> *nix systems should provide su
On Wednesday 12 July 2006 09:58, Marco van de Voort wrote:
> > On 12 jul 2006, at 11:25, Marco van de Voort wrote:
> >
> > sleep(0) is quite bad, because it may not necessarily give up any
> > timeslice. At least very short nanosleeps seem to be implemented as
> > spinning loops on Mac OS X, so may
Marco van de Voort wrote:
>> On 12 jul 2006, at 11:25, Marco van de Voort wrote:
>>
>> > I doubt it. Note that it also probably needs enhancing of the
>> > threadinterface with a giveuptimeslice functionality, something for
>> > which
>> > now sleep(0) is abused.
>>
>> sleep(0) is quite bad, becaus
> On 12 jul 2006, at 11:25, Marco van de Voort wrote:
>
> > I doubt it. Note that it also probably needs enhancing of the
> > threadinterface with a giveuptimeslice functionality, something for
> > which
> > now sleep(0) is abused.
>
> sleep(0) is quite bad, because it may not necessarily give
On Wednesday 12 July 2006 09:15, Tomas Hajny wrote:
> Well, multitasking <> multithreading. I'm not sure if DV or Win 3.x
> provide special multithreading support for DOS applications...
Nope, not really (at least for Win3.x). There are some services to aid
multi-tasking-aware applications at th
Marco van de Voort wrote:
>> Marco van de Voort wrote:
.
.
>> However, it certainly depends on whether a general solution (not
>> requiring special support like DV, etc.) is really feasible and
>> practical.
>
> I doubt it. Note that it also probably needs enhancing of the
> threadinterface with
On 12 jul 2006, at 11:25, Marco van de Voort wrote:
I doubt it. Note that it also probably needs enhancing of the
threadinterface with a giveuptimeslice functionality, something for
which
now sleep(0) is abused.
sleep(0) is quite bad, because it may not necessarily give up any
timeslice.
> Marco van de Voort wrote:
> > me.
> > I assume you are implementing a basic fixed timeslicer? What are you
> > going
> > to use it for btw? This because DV/X (which is free nowadays) afaik gives
> > you preemptive scheduling on Dos.
>
> Well, multitasking <> multithreading. I'm not sure if DV
Marco van de Voort wrote:
>> >> I need to implement some simple threading in a DOS application I am
>> >> writing with FPC. What I need to know is the following:
>> >>
>> >> 1) Does FPC protect it's stack or can I allocate memory from the heap
>> >> and point SS and ESP to it for the threads stack.
> >> I need to implement some simple threading in a DOS application I am
> >> writing with FPC. What I need to know is the following:
> >>
> >> 1) Does FPC protect it's stack or can I allocate memory from the heap
> >> and point SS and ESP to it for the threads stack.
> >>
> >
> > I believe
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