[erlang-patches] Fix serialization problem in xmerl export

Fredrik <>
Fri Sep 27 14:32:19 CEST 2013

On 09/27/2013 01:49 PM, Richard Carlsson wrote:
> The inheritance mechanism in xmerl uses 'catch apply(M,F,Args)'
> to try different modules M until one was found that had a function
> F/A. However, when M:F/A does not exist, apply/3 will trap to
> error_handler:undefined_function/3, which will call 
> code:ensure_loaded(M), making a synchronous request to the code
> server process. If many processes tried to use xmerl:export()
> concurrently, they would get serialized waiting for the code server 
> process.
> This patch uses erlang:function_exported/3 instead to check if M:F/A 
> exists. If M exists, it should already have been loaded at that point 
> due to the inheritance checking in the xmerl:callbacks/1 function.
> git fetch :richcarl/otp.git 
> xmerl-avoid-code-server-serialization
> https://github.com/richcarl/otp/tree/xmerl-avoid-code-server-serialization 
>    /Richard
> _______________________________________________
> erlang-patches mailing list
> http://erlang.org/mailman/listinfo/erlang-patches
Hello Richard,
I've created a pullrequest for your patch, which you can follow here:
The patch will be run through initial tests and then be assigned to be 
reviewed by responsible developers.


BR Fredrik Gustafsson
Erlang OTP Team

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