[zeromq-dev] 1 HWM

Brian Murphy brian at loggly.com
Fri Jul 23 18:03:21 CEST 2010

Looking at the code it seems that the LWN is calculated as HWM/2 if is
less than 500. Thus in this case LWM gets set to zero.
( pipe.cpp:319 )
Probably a bug but as you said not really important because HWM of 1
is not a very useful value, I'm not sure what a valid value of LWM
would be in this case.

On Fri, Jul 23, 2010 at 4:50 PM, ilejncs <ilejncs at narod.ru> wrote:
> Hello,
> 0mq people.
> It looks like '1' is a special HWM value.
> If it is set for DOWNSTREAM socket,
> it is never possible to send second message (assuming server side is Ok) via such socket.
> The behavior is consistent: application blocks on the second send or on poll in case of NONBLOCK mode.
> I assume the roots of the issue are somewhere near ypipe_t::flush, though not sure.
> If it is a bug, it is not really important because '1' is rather strange queue length.
> If it is a feature, the description is appreciated.
> Thanks.
> ==
> Best regards and nice weekend,
> Ilja Golshtein.
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