"Listing 1 presents the C application that invokes the
Scheme script. The first thing to notice is the inclusion of the
libguile.h header file, which makes available the necessary Guile
symbols. Next, notice a new type defined: SCM. This type is an
abstract C type that represents all Scheme objects contained within
Guile. Here, I'm representing the Scheme function that I call
later.
"The first thing that needs to be done for any thread using
Guile is to make a call to scm_init_guile. This function
initializes the global state of Guile and must be called prior to
any other Scheme function. Next, prior to calling a Scheme
function, the file in which this function resides must be loaded.
You do this by using the scm_c_primitive_load function. Note the
naming here: the _c_ in the function indicates that it is passed a
C variable (rather than a Scheme variable)."
