tree 47dd1d32b006c5244a0de77e3676447d94e5ffb8
parent f733c85a96c023c8eab588b58a588280e1dd106a
author Jeremy Kerr <jk@ozlabs.org> 1486474838 +0800
committer Jeremy Kerr <jk@ozlabs.org> 1498546502 +0800

server: improve blocked-write behaviour for handlers

We currently don't implement POLLOUT properly; we never set this for
polled events, and will repeat calls to write() if we see EAGAIN.

This change improves the behaviour when writes start to block, by
tracking when a fd is blocked. Once we detect blocking behaviour, we
supress future (non-forced) writes, and wait for POLLOUT so we know when
we can write again.

Change-Id: I809bde4e1c7c78a58ea296d5c076b3d93c272558
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>