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os: Add epoll-like pollset implementation for AIX

Browse source 
AIX's poll only allows FD_SETSIZE entries in the fd list, which is
insufficient for expanded MaxClients.

As a bonus, x11perf -noop with ~250 xlogos connected is slightly faster
with pollset:

 before          after         Operation
---------   ----------------   --------------------
5750000.0   5990000.0 (1.04)   X protocol NoOperation

Signed-off-by: Peter Harris <pharris@opentext.com>
Acked-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Peter Harris 2017-10-12 16:48:36 -04:00 • committed by Adam Jackson
commit 83c04ee6ea
2 changed files with 146 additions and 1 deletions
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1
include/meson.build
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@ -123,6 +123,7 @@ conf_data.set('HAVE_GETPROGNAME', cc.has_function('getprogname'))
conf_data.set('HAVE_GETZONEID', cc.has_function('getzoneid'))
conf_data.set('HAVE_MMAP', cc.has_function('mmap'))
conf_data.set('HAVE_POLL', cc.has_function('poll'))
conf_data.set('HAVE_POLLSET_CREATE', cc.has_function('pollset_create'))
conf_data.set('HAVE_POSIX_FALLOCATE', cc.has_function('posix_fallocate'))
conf_data.set('HAVE_REALLOCARRAY', cc.has_function('reallocarray', dependencies: libbsd_dep))
conf_data.set('HAVE_SETEUID', cc.has_function('seteuid'))