vlib: introduce vlib_get_main_by_index(), vlib_get_n_threads()

Type: improvement
Change-Id: If3da7d4338470912f37ff1794620418d928fb77f
Signed-off-by: Damjan Marion <damarion@cisco.com>
diff --git a/src/vlib/unix/input.c b/src/vlib/unix/input.c
index 6398148..9c7c54f 100644
--- a/src/vlib/unix/input.c
+++ b/src/vlib/unix/input.c
@@ -198,9 +198,9 @@
 	  }
 	node->input_main_loops_per_call = 0;
       }
-    else if (is_main == 0 && vector_rate < 2
-	     && (vlib_global_main.time_last_barrier_release + 0.5 < now)
-	     && nm->input_node_counts_by_state[VLIB_NODE_STATE_POLLING] == 0)
+    else if (is_main == 0 && vector_rate < 2 &&
+	     (vlib_get_first_main ()->time_last_barrier_release + 0.5 < now) &&
+	     nm->input_node_counts_by_state[VLIB_NODE_STATE_POLLING] == 0)
       {
 	timeout = 10e-3;
 	timeout_ms = max_timeout_ms;