# SDL_RegisterEvents Allocate a set of user-defined events, and return the beginning event number for that set of events. ## Header File Defined in [<SDL3/SDL_events.h>](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_events.h) ## Syntax ```c Uint32 SDL_RegisterEvents(int numevents); ``` ## Function Parameters | | | | | --- | ------------- | ------------------------------------- | | int | **numevents** | the number of events to be allocated. | ## Return Value ([Uint32](Uint32)) Returns the beginning event number, or 0 if numevents is invalid or if there are not enough user-defined events left. ## Thread Safety It is safe to call this function from any thread. ## Version This function is available since SDL 3.2.0. ## See Also - [SDL_PushEvent](SDL_PushEvent) ---- [CategoryAPI](CategoryAPI), [CategoryAPIFunction](CategoryAPIFunction), [CategoryEvents](CategoryEvents)