extern int Threads_SetUID(Uint *errno, tUID ID);
extern tGID Threads_GetGID();
extern int Threads_SetGID(Uint *errno, tGID ID);
extern int Threads_SetUID(Uint *errno, tUID ID);
extern tGID Threads_GetGID();
extern int Threads_SetGID(Uint *errno, tGID ID);