[erlang-questions] hot code reloading

Gianfranco Alongi <>
Sun Mar 2 10:31:22 CET 2014


I actually recommend the documentation, it covers this in a few paragraphs
http://www.erlang.org/doc/reference_manual/code_loading.html#id84603



On Sun, Mar 2, 2014 at 9:10 AM, Bob Ippolito <> wrote:

> The remote call bar:hello() will always call the newest version of
> bar:hello/0. The calling module is irrelevant, even if the call happens
> from the old version of bar the newest version will always be called using
> that syntax. A local call from bar to hello() (or an equivalent
> closure) would use the current version referenced by that process.
>
> Modules are not linked together in any way so how or when they were
> compiled is not so relevant.
>
>
> On Saturday, March 1, 2014, t x <> wrote:
>
>> Hi,
>>
>>   I'm reading Chapter 8 of Programming Erlang, and I want to verify if
>> my mental model of erlang code reloading is correct. My erlang is a
>> bit weak, so I'm going to use C++ notation.
>>
>> https://gist.github.com/anonymous/9299344
>>
>>   Is the above correct with respect to *compile* and *lookup* ?
>>
>>   It seems to me the defining characteristics of erlang's code hot
>> reloading is:
>>
>>   * we have an "old" and a "new"
>>   * the new becomes the old, and we kill all processes spawned by the old
>>
>>   Suppose we have
>>
>>   * module foo, module bar;
>>   * foo:hi(), refers to bar:hello();
>>
>>   * we recompile bar; now, all foo's references to bar, uses the
>> _latest_ bar, not the bar that existed when foo was compiled
>>
>> If I have misunderstood anything, please correct me.
>>
>> Thanks!
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>> 
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>>
>
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