SWI-Prolog -- API-function PL_new

Documentation
- Reference manual
  - Foreign Language Interface
    - The Foreign Include File
      - Atoms and functors
        
        PL_new_atom()
        
        PL_new_atom_mbchars()
        
        PL_atom_chars()
        
        PL_new_functor()
        
        PL_functor_name()
        
        PL_functor_arity()
        
        Atoms and atom garbage collection
- Packages

to use the yield facility and provide a Prolog API to manage sets of engines that use this type of yielding. As is, these features are designed to allow SWI-Prolog for cooperating with languages that provide asynchronous functions.