[zeromq-dev] zmq::socket_t::send blocking

Jens Auer jens.auer at betaversion.net
Fri Jan 20 21:27:46 CET 2017



quoting the manual from the link in Colin’s answer:

When a ZMQ_PUSH socket enters the mute state due to having reached the high water mark for all downstream nodes, or if there are no downstream nodes at all, then any zmq_send(3) operations on the socket shall block until the mute state ends or at least one downstream node becomes available for sending; messages are not discarded.


Best wishes,



Von: zeromq-dev [mailto:zeromq-dev-bounces at lists.zeromq.org] Im Auftrag von Alexandre Quessy
Gesendet: Freitag, 20. Januar 2017 20:00
An: ZeroMQ development list
Betreff: Re: [zeromq-dev] zmq::socket_t::send blocking





Consultant software

D-BOX Technologies Inc. | A. 2172 de la Province, Longueuil, QC J4G 1R7 CANADA | T. 450-442-3003 | W.  <http://www.d-box.com> d-box.com

De : zeromq-dev [mailto:zeromq-dev-bounces at lists.zeromq.org] De la part de Colin Ingarfield
Envoyé : 20 janvier 2017 12:04
À : ZeroMQ development list <zeromq-dev at lists.zeromq.org>
Objet : Re: [zeromq-dev] zmq::socket_t::send blocking


It depends on the type of socket and whether it has reached its HWM.  Some types of socket will block, others will drop the message, others could enqueue it and return immediately.

The behavior for each type of socket is documented here: http://api.zeromq.org/4-0:zmq-socket

Thank you for your answer!

The socket is a inproc:// ZMQ_PUSH socket.

Will that block until the message is sent, if I don’t provide the ZMQ_DONTWAIT option?



On 1/20/17 11:00 AM, Alexandre Quessy wrote:


zmq::socket_t::send() - Is that blocking by default?

I need it to be blocking. (wait for the data to be sent before continuing)


If I set the flag ZMQ_DONTWAIT (formerly ZMQ_NOBLOCK) it should be non-blocking. So if I don’t set it, it should block?

Thank you,


Consultant software

D-BOX Technologies Inc. | A. 2172 de la Province, Longueuil, QC J4G 1R7 CANADA | T. 450-442-3003 | W.  <http://www.d-box.com> d-box.com

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