Availability:C-language interface function
(return) foreign_t PL_retry(intptr_t
value)The foreign function succeeds while leaving a choice point. On
backtracking over this goal the foreign function will be called again,
but the control argument now indicates it is a‘Redo' call and the
macro PL_foreign_context()
returns the handle passed via
PL_retry().
This handle is a signed value two bits smaller than a pointer, i.e., 30
or 62 bits (two bits are used for status indication). Defined as return
_PL_retry(n).
See also PL_succeed().