auto: Add a check for Linux's sched_getaffinity(2)

This will help to better determine the number of router threads to
create in certain situations.

Unlike sysconf(_SC_NPROCESSORS_ONLN) this takes into account per-process
cpu allowed masks as set by sched_setaffinity(2)/cpusets etc.

So while a system may have 64 on-line cpu's, Unit itself may be limited
to using just four of them in which case we should create four extra
router threads, not sixty-four!

Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/configure b/configure
index 4ad0dcdc..6929d41d 100755
--- a/configure
+++ b/configure
@@ -135,6 +135,7 @@ fi
 . auto/cgroup
 . auto/isolation
 . auto/capability
+. auto/sched
 
 
 case "$NXT_SYSTEM_PLATFORM" in