This documentation is for version v1.3.0 of NNG, but the latest released version is v1.8.0. see the documentation for v1.8.0 for the most up-to-date information.


#include <nng/protocol/pipeline0/pull.h>


The pull protocol is one half of a pipeline pattern. The other half is the push protocol.

In the pipeline pattern, pushers distribute messages to pullers. Each message sent by a pusher will be sent to one of its peer pullers, chosen in a round-robin fashion from the set of connected peers available for receiving. This property makes this pattern useful in load-balancing scenarios.

Socket Operations

The nng_pull0_open() functions create a puller socket. This socket may be used to receive messages, but is unable to send them. Attempts to send messages will result in NNG_ENOTSUP.

When receiving messages, the pull protocol accepts messages as they arrive from peers. If two peers both have a message ready, the order in which messages are handled is undefined.

Protocol Versions

Only version 0 of this protocol is supported. (At the time of writing, no other versions of this protocol have been defined.)

Protocol Options

The pull protocol has no protocol-specific options.

Protocol Headers

The pull protocol has no protocol-specific headers.