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| markn at cs.mu.OZ.AU |
 Posted: Fri May 14, 1999 5:42 am |
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Guest
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G'day !
I was wondering if there are currently any know problems or issues or gotchas
with dynamic code replacement under Erlang.
thanks,
mark
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| tobbe at serc.rmit.edu.au |
| Posted: Fri May 14, 1999 6:06 am |
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Guest
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> I was wondering if there are currently any know problems or
> issues or gotchas with dynamic code replacement under Erlang.
No...
Well, in the case where you are running a server. Make sure that
you make a module prefixed recursive call to the top loop.
Example:
loop(Data) ->
receive
X ->
NewData = do_stuff(Data,X),
?MODULE:loop(NewData)
end.
You also have to export (in this case) the loop/1 function.
/Tobbe
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| ulf.wiger at etxb.ericsso |
| Posted: Fri May 14, 1999 8:21 am |
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Mark NG wrote:
>
> G'day !
>
> I was wondering if there are currently any know problems or issues or gotchas
> with dynamic code replacement under Erlang.
>
> thanks,
> mark
Not really any issues in the sense that it wouldn't work
Dynamic code replacement can be about as easy or complex as you
want/need to make it. The easiest part is simply loading the module. For
library code, this is all that's needed.
Torbjorn Tornkvist wrote:
> Well, in the case where you are running a server. Make sure that
> you make a module prefixed recursive call to the top loop.
> Example:
>
> loop(Data) ->
> receive
> X ->
> NewData = do_stuff(Data,X),
> ?MODULE:loop(NewData)
> end.
If your new version has a different representation of Data, this will
not work. For this eventuality, OTP provides a framework for performing
synchronized code change with hooks for transformation of internal
state.
A couple of pointers:
- If you want to learn about OTP's system messages
http://www.erlang.org/doc/doc/index.html
(Click on "Design Principles")
- If you want to learn about OTP's release handling:
http://www.erlang.org/doc/doc/lib/sasl-1.6.3/doc/index.html
(see the User's Guide.)
/Uffe
--
Ulf Wiger, Chief Designer AXD 301 <ulf.wiger_at_etxb.ericsson.se>
Ericsson Telecom AB tfn: +46 8 719 81 95
Varuv |
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