> On Sep 17, 2022, at 7:40 PM, Sven Barth <[email protected]> wrote:
>
> It seems you haven't read the part about capturing variables in my
> announcement mail, cause you have two problems:
> First the specific problem your code has: i is a global variables and global
> variables are *never* captured, because they don't need to.
> But even if you'd change your code so that the threads are initialized inside
> a procedure instead of the main block this would still not work, because
> variables are captured *by reference* which means that i would be shared
> between all newly created threads plus the main thread and depending on how
> the threads are scheduled the main thread will reach the call to WaitFor
> where i will again start from 0.
I didn’t know they were captured by reference! Does this mean they’re
essentially pointers pointing the same variable?
Even so I’m trying now to modifying the example by copying to a local variable
but I still see this same behavior suggesting there isn’t actually a copy. Why
is this?
callback := TCallback.Create(procedure
var
index: integer;
begin
index := i;
writeln('Invoked: ', index, ' id: ',
HexStr(TThread.CurrentThread));
end);
Regards,
Ryan Joseph
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