sdl_lockaudio(3) - Linux man page
Name
SDL_LockAudio - Lock out the callback functionSynopsis
#include "SDL.h"
void SDL_LockAudio(void)
Description
The lock manipulated by these functions protects the callback function. During a LockAudio period, you can be guaranteed that the callback function is not running. Do not call these from the callback function or you will cause deadlock.
See Also
SDL_OpenAudio