[zeromq-dev] High water mark notification for publisher

Edwin Amsler edwinamsler at thinkboxsoftware.com
Sat Sep 22 03:22:16 CEST 2012

Completely agree here Justin. It would probably be best to work like 
normalish sockets (where there's one sender, one receiver) where if it's 
set to blocking, it would block when all queues are full, but if 
non-blocking it would return false on send and set errno to EAGAIN when 
all queues are full. I definitely agree that when there are no receivers 
it should also return false or block, but perhaps use a different errno.

I think this is a common enough use case, and we'd also be backward 
compatible. For example, if a user set the socket to non-blocking and 
ignored the return value, it would behave exactly as the current 
implementation does.

In my case I'm using the epgm protocol here, so there's really no way 
for me to know who's listening, but this functionality would work for 
both types of PUBs. Either way, I'd like to add this functionality to 
ZeroMQ, I just need a mentor to give me a hand with it.

On 21/09/2012 7:26 PM, Justin Karneges wrote:
> In my previous message I suggested that writes to a pub socket should block if
> all subscribers' queues were full.

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