On Monday, 1994-08-01  Stacy Smith wrote to David Noon about
"Thunking, I Think..." as follows:

Hi Stacy,

SS> Thanks for the detailed explanation!

You're welcome.

SS> DN| there are 2 API calls, DosFlatToSel() and DosSelToFlat(), that will
SS>   | allow you to convert pointers almost-manually; note that these API
SS>   | calls use Optlink calling convention.
SS> 
SS> Ummm..."Optlink calling convention"?  What would that be?

The Optlink calling convention passes parameters in registers instead
of on the stack. It is faster than the system calling convention that
is used by most API calls. The C Set ++ compiler use Optlink by
default; the APIENTRY macro provides the override for the other API
calls. You can also use this linkage from IBM PL/I for OS/2, Watcom
C/C++ and (I believe) Metaware High C/C++ for OS/2; Borland C/C++ for
OS/2 is a bit of a crap shoot, since their _Fastcall linkage is the
nearest they offer.

Regards

Dave

___
 X KWQ/2 1.2e X Is Mike Tyson going to have O.J. for breakfast soon?

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