vlib: epoll on worker threads

[vpp.git] / src / vlib / main.c

diff --git a/src/vlib/main.c b/src/vlib/main.c
index d32ca7b..5efeac2 100644 (file)
--- a/src/vlib/main.c
+++ b/src/vlib/main.c
@@ -1493,13 +1493,12 @@ vlib_main_or_worker_loop (vlib_main_t * vm, int is_main)
        }
 
       /* Process pre-input nodes. */
-      if (is_main)
-       vec_foreach (n, nm->nodes_by_type[VLIB_NODE_TYPE_PRE_INPUT])
-         cpu_time_now = dispatch_node (vm, n,
-                                       VLIB_NODE_TYPE_PRE_INPUT,
-                                       VLIB_NODE_STATE_POLLING,
-                                       /* frame */ 0,
-                                       cpu_time_now);
+      vec_foreach (n, nm->nodes_by_type[VLIB_NODE_TYPE_PRE_INPUT])
+       cpu_time_now = dispatch_node (vm, n,
+                                     VLIB_NODE_TYPE_PRE_INPUT,
+                                     VLIB_NODE_STATE_POLLING,
+                                     /* frame */ 0,
+                                     cpu_time_now);
 
       /* Next process input nodes. */
       vec_foreach (n, nm->nodes_by_type[VLIB_NODE_TYPE_INPUT])
@@ -1514,13 +1513,19 @@ vlib_main_or_worker_loop (vlib_main_t * vm, int is_main)
 
       /* Next handle interrupts. */
       {
+       /* unlocked read, for performance */
        uword l = _vec_len (nm->pending_interrupt_node_runtime_indices);
        uword i;
-       if (l > 0)
+       if (PREDICT_FALSE (l > 0))
          {
            u32 *tmp;
            if (!is_main)
-             clib_spinlock_lock (&nm->pending_interrupt_lock);
+             {
+               clib_spinlock_lock (&nm->pending_interrupt_lock);
+               /* Re-read w/ lock held, in case another thread added an item */
+               l = _vec_len (nm->pending_interrupt_node_runtime_indices);
+             }
+
            tmp = nm->pending_interrupt_node_runtime_indices;
            nm->pending_interrupt_node_runtime_indices =
              last_node_runtime_indices;