(This is the documentation for SDL3, which is under heavy development and the API is changing! SDL2 is the current stable version!)
Restart one of the threads that are waiting on the condition variable.
int SDL_CondSignal(SDL_cond * cond);
the condition variable to signal
Returns 0 on success or a negative error code on failure; call SDL_GetError() for more information.
This function is available since SDL 3.0.0.