On Fri, 6 Apr 2012, Leonardo M. Ramé wrote:
I have a similar problem to this:
http://www.lazarus.freepascal.org/index.php?topic=10571.0
My main program launches a thread, that loads a shared library, then
execute a function who receives as a parameter a pointer to a callback
function and an instance of the caller, as this:
procedure TMythread.execute;
begin
...
// external function
runcode(@MyCallBack, @Self);
...
end;
procedure MyCallback(const Result: PAnsiChar; const ACaller: pointer);
cdecl;
var
lCaller: TMythread;
begin
// the parameter ACaller is used because callbacks can't be of type
// procedure of object.
lCaller := TMyThread(ACaller);
lCaller.TestVar := Result; // <--- Ok.
lCaller.ListOfThings.Add; // <--- SIGSEGV
IMHO the problem is not in threads.
You cannot pass objects to libraries or vice versa.
The VMTs will differ.
Michael.
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