Core: worker_cpu_affinity auto. If enabled, workers are bound to available CPUs, each worker to once CPU in order. If there are more workers than available CPUs, remaining are bound in a loop, starting again from the first available CPU. The optional mask parameter defines which CPUs are available for automatic binding. In collaboration with Vladimir Homutov.

--- a/src/core/ngx_cycle.h
+++ b/src/core/ngx_cycle.h
@@ -88,6 +88,7 @@ typedef struct {
 
      int                      priority;
 
+     ngx_uint_t               cpu_affinity_auto;
      ngx_uint_t               cpu_affinity_n;
      uint64_t                *cpu_affinity;