[erlang-questions] enif_send backpressure

[Roger Lipscombe]

On 25 May 2017 at 13:20, Roger Lipscombe <roger@REDACTED> wrote:

> It's my understanding that if a normal Erlang process does Pid ! Msg, and
> Pid has a particularly full message queue, then the sending process is
> penalised (gives up the remainder of its timeslice, e.g.).
>

I found the relevant code. Search for erts_use_sender_punish in the OTP
source.

Is there any way to implement something similar for enif_send from a NIF?
>

Note that enif_send calls erts_queue_message, which *does* return the
recipient's queue length (afaict). It's just that enif_send discards the
result. Would a PR which implemented (e.g.) enif_send_return_len -- naming
is hard, suggestions appreciated -- be considered for OTP 20.x?
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