Warning: This is the manual of the legacy Guile 2.2 series. You may want to read the manual of the current stable series instead.

5.2.1 Guile Initialization Functions

To initialize Guile, you can use one of several functions. The first, scm_with_guile, is the most portable way to initialize Guile. It will initialize Guile when necessary and then call a function that you can specify. Multiple threads can call scm_with_guile concurrently and it can also be called more than once in a given thread. The global state of Guile will survive from one call of scm_with_guile to the next. Your function is called from within scm_with_guile since the garbage collector of Guile needs to know where the stack of each thread is.

A second function, scm_init_guile, initializes Guile for the current thread. When it returns, you can use the Guile API in the current thread. This function employs some non-portable magic to learn about stack bounds and might thus not be available on all platforms.

One common way to use Guile is to write a set of C functions which perform some useful task, make them callable from Scheme, and then link the program with Guile. This yields a Scheme interpreter just like guile, but augmented with extra functions for some specific application — a special-purpose scripting language.

In this situation, the application should probably process its command-line arguments in the same manner as the stock Guile interpreter. To make that straightforward, Guile provides the scm_boot_guile and scm_shell function.

For more about these functions, see Initialization.