Different environments in NIF API calls

[Sverker Eriksson]

The ‘env’ argument of functions that only read supplied terms (like enif_get_* functions) is not used in current implementation. And as we have introduced functions like enif_compare that lacks ‘env’ arguments, it is now impossible to do an implementation of the API where ERL_NIF_TERM’s are not self contained.

 

So, yes you can use enif_get_map_value with map and key argument from different environment. The same goes for enif_compare and all other functions with term arguments that are only read and not referred by new constructed terms.

 

/Sverker

 

 

From: erlang-questions <erlang-questions-bounces@REDACTED> On Behalf Of Harris, Robert
Sent: den 23 februari 2021 13:21
To: erlang-questions@REDACTED Questions <erlang-questions@REDACTED>
Subject: Different environments in NIF API calls

 

Hello,

I'm trying to understand the full implications of

"All API functions that read or write terms has the environment
that the term belongs to as the first function argument."

For example, can enif_get_map_value() be called with a map from
a process-bound environment and a key from a process-independent
one? If so, which environment would be used?

Similarly, does enif_compare require that its arguments share
the same environment?

Regards,

Robert

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