c('PL_current_query')

Documentation
- Reference manual
  - Foreign Language Interface
    - The Foreign Include File
      - Calling Prolog from C
        
        Initiating a query from C
        
        PL_open_query()
        
        PL_next_solution()
        
        PL_cut_query()
        
        PL_close_query()
        
        PL_current_query()
        
        PL_call_predicate()
        
        PL_call()
- Packages

Availability:C-language interface function

qid_t PL_current_query(void)

Returns the query id of of the current query or 0 if the current thread is not executing any queries.