SDL

#define FF_ALLOC_EVENT   (SDL_USEREVENT)
#define FF_REFRESH_EVENT (SDL_USEREVENT + 1)
#define FF_QUIT_EVENT (SDL_USEREVENT + 2)
...

SDL_Event event;
event.type = FF_QUIT_EVENT;
event.user.data1 = pVideoState;
SDL_PushEvent(&event);
...