If event is not NULL, the next event is removed from the queue and stored
in the SDL_Event structure pointed to by event.
As this function may implicitly call SDL_PumpEvents(), you can only call
this function in the thread that initialized the video subsystem.
\param event the SDL_Event structure to be filled in with the next event
from the queue, or NULL.
\returns true on success or false if there was an error while waiting for
events; call SDL_GetError() for more information.
\threadsafety This function should only be called on the main thread.
\since This function is available since SDL 3.2.0.
Wait indefinitely for the next available event.
If event is not NULL, the next event is removed from the queue and stored in the SDL_Event structure pointed to by event.
As this function may implicitly call SDL_PumpEvents(), you can only call this function in the thread that initialized the video subsystem.
\param event the SDL_Event structure to be filled in with the next event from the queue, or NULL. \returns true on success or false if there was an error while waiting for events; call SDL_GetError() for more information.
\threadsafety This function should only be called on the main thread.
\since This function is available since SDL 3.2.0.
\sa SDL_PollEvent \sa SDL_PushEvent \sa SDL_WaitEventTimeout