c('PL_can_yield')

Documentation
- Reference manual
  - Foreign Language Interface
    - The Foreign Include File
      - Argument Passing and Control
        
        Yielding from foreign predicates
        
        PL_yield_address()
        
        PL_can_yield()
- Packages

Availability:C-language interface function

int PL_can_yield(void)

Returns TRUE when called from inside a foreign predicate if the query that (indirectly) calls this foreign predicate can yield using PL_yield_address(). Returns FALSE when either there is no current query or the query cannot yield.