AllocSLCallback(3w)

NAME

AllocSLCallback (KERNEL32.@)

DWORD AllocSLCallback
 (
  DWORD finalizer,
  DWORD callback
 )

finalizer [In] Finalizer function.

[In] Callback function.

Allocate a 16->32 callback.

Win95 uses some structchains for callbacks. It allocates them in blocks of 100 entries, size 32 bytes each, layout:

blockstart:: 0: PTR nextblockstart
4: entry *first;
8: WORD sel ( start points to blockstart)
A: WORD unknown
100xentry:: 00..17: Code
18: PDB *owning_process;
1C: PTR blockstart.
We ignore this for now. (Just a note for further developers)
FIXME: use this method, so we don't waste selectors...
Following code is then generated by AllocSLCallback. The code is 16 bit, so the 0x66 prefix switches from word->long registers.: 665A pop edx
6668x arg2 x pushl <arg2>
6652 push edx
EAx arg1 x jmpf <arg1>.
returns the startaddress of this thunk.
Note, that they look very similar to the ones allocates by THUNK_Alloc.

A segmented pointer to the start of the thunk

Not defined in a Wine header. The function is either undocumented, or missing from Wine.

Implemented in "build/buildd-wine-unstable_1.1.32-1+b1-amd64-KnxYu0/wine-unstable-1.1.32/build32/dlls/kernel32/thunk.c".

Available on x86 platforms only.

Debug channel "thunk".