SDL_UserEvent - A user-defined event type

SDL_UserEvent is in the user member of the structure SDL_Event. This event is unique, it is never created
       by  SDL  but  only  by  the  user.  The event can be pushed onto the event queue using SDL_PushEvent. The
       contents of the structure members or completely up to the programmer, the only requirement is  that  type
       is a value from SDL_USEREVENT to SDL_NUMEVENTS-1 (inclusive).

       SDL_Event event;

       event.type = SDL_USEREVENT;
       event.user.code = my_event_code;
       event.user.data1 = significant_data;
       event.user.data2 = 0;
       SDL_PushEvent(&event);

       SDL_UserEvent - A user-defined event type

SDL_Event, SDL_PushEvent

SDL                                          Tue 11 Sep 2001, 23:00                             SDL_UserEvent(3)

typeSDL_USEREVENT through to SDL_NUMEVENTS-1code                User defined event code

       data1               User defined data pointer

       data2               User defined data pointer

       typedef struct{
         Uint8 type;
         int code;
         void *data1;
         void *data2;
       } SDL_UserEvent;