Hello.
I'm trying to fix SDL2 library bindings for Racket. The library includes
the function SDL_AddTimer, which, according to documentation, takes
callback and runs it in another thread. Without #:async-apply keyword on
FFI callback definition the call to SDL_AddTimer segfaults, which is to be
expected. Adding #:async-apply fixes the crash, but in that case it seems
that the callback is not being called (and even async-apply helper itself).
Here's the code:
(define (async-apply thunk)
(displayln "in async-apply") ;; never gets called
(thunk))
(define _SDL_TimerCallback (_fun #:async-apply async-apply _uint32 _pointer
-> _uint32))
(define-sdl2 SDL_AddTimer (_fun _uint32 _SDL_TimerCallback _pointer ->
_int))
(SDL_AddTimer
1000
(lambda (interval dummy)
(displayln "in callback") ;; never gets called
1000)
#f)
(sleep 10)
Could someone please point me at what am I doing wrong?
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