[erlang-questions] gen_tcp nonblocking send

Daniel Ginsburg <>
Thu May 1 16:03:39 CEST 2008

On 01.05.2008 17:50 Valentin Micic wrote:

> Does this mean that O_NDELAY is not supported in Erlang? Not even as an 
> undocumented feature? ;-)

Internally, sockets are non-blocking (see 
erts/emulator/drivers/common/inet_drv.c), but as far as I understand, 
gen_tcp and all the underlying libraries like prim_inet expose only 
blocking send API to erlang processes.

There's nice workaround, as Per suggested. I tried it, and it works like 
charm (thanks again, Per!).

There's also unresolved problem with hot code upgrade for blocked 
process, but for me this is a minor issue.


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