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The theory of computable functions by Alan Turning greatly influenced the construction of modern digital computers.
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sdl_quitsubsystem(3) [opensolaris man page]

SDL_QuitSubSystem(3)						 SDL API Reference					      SDL_QuitSubSystem(3)

SDL_QuitSubSystem - Shut down a subsystem SYNOPSIS
#include "SDL.h" void SDL_QuitSubSystem(Uint32 flags); DESCRIPTION
SDL_QuitSubSystem allows you to shut down a subsystem that has been previously initialized by SDL_Init or SDL_InitSubSystem. The flags tells SDL_QuitSubSystem which subsystems to shut down, it uses the same values that are passed to SDL_Init. SEE ALSO
SDL_Quit, SDL_Init, SDL_InitSubSystem SDL
Tue 11 Sep 2001, 23:00 SDL_QuitSubSystem(3)

Check Out this Related Man Page

SDL_WasInit(3)							 SDL API Reference						    SDL_WasInit(3)

SDL_WasInit- Check which subsystems are initialized SYNOPSIS
#include "SDL.h" Uint32 SDL_WasInit(Uint32 flags); DESCRIPTION
SDL_WasInit allows you to see which SDL subsytems have been initialized. flags is a bitwise OR'd combination of the subsystems you wish to check (see SDL_Init for a list of subsystem flags). RETURN VALUE
SDL_WasInit returns a bitwised OR'd combination of the initialized subsystems. EXAMPLES
/* Here are several ways you can use SDL_WasInit() */ /* Get init data on all the subsystems */ Uint32 subsystem_init; subsystem_init=SDL_WasInit(SDL_INIT_EVERYTHING); if(subsystem_init&SDL_INIT_VIDEO) printf("Video is initialized. "); else printf("Video is not initialized. "); /* Just check for one specfic subsystem */ if(SDL_WasInit(SDL_INIT_VIDEO)!=0) printf("Video is initialized. "); else printf("Video is not initialized. "); /* Check for two subsystems */ Uint32 subsystem_mask=SDL_INIT_VIDEO|SDL_INIT_AUDIO; if(SDL_WasInit(subsystem_mask)==subsystem_mask) printf("Video and Audio initialized. "); else printf("Video and Audio not initialized. "); SEE ALSO
SDL_Init, SDL_Subsystem SDL
Tue 11 Sep 2001, 23:00 SDL_WasInit(3)