[erlang-questions] Hot code loading and OTP
Fri Sep 21 18:12:34 CEST 2007
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?
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.
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