[erlang-questions] process suspended on bif_return_trap/1

[Jesper Louis Andersen]

The bif_return_trap/1 is a trampoline function used by bifs that suspend in
order to graft them onto the normal interpreter later on. It's purpose is
to make the BIF look like a normal function.

Processes might get suspended on a send for two reasons:

* The process you are looking for is in another castle (read: on a foreign
node). If the TCP buffer for the distribution protocol is full the process
gets suspend until there is room.
* The port you are sending to is currently busy. What this means depends on
the type of port, but usually this is a full buffer of some kind as well.


On Thu, Mar 12, 2015 at 10:52 AM, Dror Mein <drormein@REDACTED> wrote:

> hi all,
> I have a gen_server process who is suspended. it's stack trace has him
> currently trying to send a message with a bang.
> my first question is why? why a process gets suspended? current function:
> erlang:bif_return_trap/1
> the destination process is ok.
> second question: how do you guard from a situation like this?
>
> Thanks,
> Dror
>
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-- 
J.
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