[zeromq-dev] ZMQ_DONTWAIT documentation

[Daniel Krikun]

Hello,

In `zmq_send(3)` it is said that if ZMQ_DONTWAIT is set and a message
cannot be queued on the socket the zmq_send() shall fail with errno
set to EAGAIN.
What does it exactly mean "cannot be queued"?
Does it mean that the high watermark has been reached and the socket
is thus blocked/message has been dropped?
If not, what else could prevent a message from being queued?

--
Daniel Krikun