Availability:C-language interface function
PL_dispatch_hook_t PL_dispatch_hook(PL_dispatch_hook_t)If this hook is not NULL, this function is called when reading from the
terminal. It is supposed to dispatch events when SWI-Prolog is connected
to a window environment. It can return two values:
PL_DISPATCH_INPUT indicates Prolog input is available on
file descriptor 0 or PL_DISPATCH_TIMEOUT to indicate a
timeout. The old hook is returned. The type PL_dispatch_hook_t
is defined as:
typedef int (*PL_dispatch_hook_t)(void);