On Thu 14 Mar 2013 05:40, Mike Gran <spk...@yahoo.com> writes: > In boot-9, a function `quit' is defined. It appears in the manual, > but, in boot-9 it can take an argument. In the manual it never > takes an argument. > > In boot-9, `exit' is aliased to quit. In the manual `exit' is > > undocumented; however, in the documentation in (rnrs programs), > it notes that (rnrs programs)'s version of exit is the same > as the "core" version of exit. > > And then there is primitive-exit and primitive-_exit, which are > described in the manual. > > So clearly, there's some confusion here. Are 'quit' and 'exit' > supposed to be API? Is the fact that they can take an argument > supposed to be documented? > > Or is 'primitive-exit' the generally the way to go?
`primitive-_exit' is the C `_exit' function. It quits immediately, without calling atexit() functions. `primitive-exit' is the C `exit' function. It runs atexit() functions and then quits. The Scheme `exit' function throws `quit', which is handled by the outermost catch handler, which calls the C `exit' function. In this way calling Scheme's `exit' unwinds the dynamic stack. They should all be documented. Hope that helps, Andy -- http://wingolog.org/
