Use this function to clear events from the event queue.
void SDL_FlushEvent(Uint32 type)
the type of event to be cleared; see SDL_EventType for details
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This will unconditionally remove any events from the queue that match type. If you need to remove a range of event types, use SDL_FlushEvents() instead.
It's also normal to just ignore events you don't care about in your event loop without calling this function.
This function only affects currently queued events. If you want to make sure that all pending OS events are flushed, you can call SDL_PumpEvents() on the main thread immediately before the flush call.