Hi everybody,
I am trying to use a shared lib written in C in my FPC program. The lib
creates a number of threads and requires callbacks into the main app. It
can call the callback from any of the threads.
When I compile without stack checking everything (seems) to work fine
but when stack checking is on I get stack error (error 202) on entry to
the callback function. I can break on the callback's 'begin' and see
valid values for all the function parameters but when I step into the
function body it crashes.
I say 'seems' when not using stack checking because when the app becomes
large I get a lot of strange problems which would probably be explained
by stack problems.
The .h file:
typedef int (*VortexOnAcceptedConnection) (VortexConnection *
connection, axlPointer data);
The pascal file:
type
PVortexConnection = Pointer;
TaxlPointer = Pointer;
TVortexOnAcceptedConnection = function
(connection:PVortexConnection; data:TaxlPointer):longint;cdecl;
{This is the callback function called by the C library. It never gets
called from the pascal code.}
function on_accepted(connection: PVortexConnection; data: TaxlPointer):
longint;cdecl;
begin
Result := 1;
end;
I have tried all the function modifiers, they all give the same problem.
I run fpc 2.2.4 on Kubuntu 9.04.
I ran the C version of this test application using valgrind and it
doesn't give a single problem.
Any ideas or opinions will be appreciated.
Wimpie
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