[erlang-questions] Hot code loading and OTP

Joe Armstrong <>
Fri Sep 21 22:06:48 CEST 2007


On 9/21/07, David Terrell <> wrote:
> On Fri, Sep 21, 2007 at 08:19:56AM -0700, Jay Nelson wrote:
> > A friend who hadn't seen erlang before just finished reading Joe's
> > book.  We were discussing hot code loading and he didn't realize that
> > prefixing a function call with a Module: caused a load of code from
> > disk.  I attempted to search through the book and find the
> > description, but was unable to find an explicit reference.  Was this
> > accidentally left out?

It doesn't load from disk - it calls the latest version of the module.

This *is* described in detail in appendix E.4

/Joe


>
> calling Module:Func only loads the module from disk if the module
> was not loaded before.  It does not reload the module.
>
> The only time there's a difference in behavior is the case of
> localfunc(Args) vs ?MODULE:localfunc(Args).  The former will
> stay in the same version of the module; the latter will break
> out of the stale version and into the new version if the module
> has been reloaded.
>
> --
> David Terrell
> 
> ((meatspace)) http://meat.net/
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