text: 
  #ifndef THREADS_H
  
  #define THREADS_H 1
  
  typedef struct thread_attr_struct {
    UInt		    ssize;
    UInt		    tsize;
    UInt		    sysize;
    int		   (*cancel)(int thread);
    Term              egoal;
  } thread_attr;
  
  #ifdef THREADS
  
  Int STD_PROTO(Yap_thread_self,(void));
  int STD_PROTO(Yap_get_thread_ref_count,(int));
  void STD_PROTO(Yap_set_thread_ref_count,(int,int));
  CELL STD_PROTO(Yap_thread_create_engine,(thread_attr *));
  Int STD_PROTO(Yap_thread_attach_engine,(int));
  Int STD_PROTO(Yap_thread_detach_engine,(int));
  Int STD_PROTO(Yap_thread_destroy_engine,(int));
  
  #endif
  
  #endif
  