[erlang-questions] enif_send rules questions
Fri Jan 13 23:53:07 CET 2017
On Fri, Jan 13, 2017 at 10:09 AM, Sverker Eriksson <
> On 01/12/2017 08:21 PM, Jason Orendorff wrote:
>> 4. We suspect it's actually totally safe to pass a process-independent
>> environment as the first parameter, regardless of whether there's a
>> "calling process" or we're "calling from a created thread". Is it?
>> If so, would you accept a patch to document that that's OK?
> I'm not super excited about such a guarantee, at least not right now.
Thank you for the quick, thoughtful response. I appreciate your time.
Is there a way to enforce this rule for our users that we've missed? When
our `send` method is called, I think we have to figure out if there's a
calling process, and if so, its environment. I don't see a way to do it
storing that information in TLS ahead of time -- at a cost to every NIF
We could make code that runs on created threads statically different from
code that runs in the Erlang scheduler's threads, e.g. by making
`NifCallEnv`, `AllocatedEnvInNifThread`, and `AllocatedEnvInCreatedThread`
three different types, of which only 2 have `.send()` methods. But this
We have considered several possible approaches, all about as bad as that.
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