Clean up multi-thread barrier-sync hold-down timer

[vpp.git] / src / vlib / unix / input.c

diff --git a/src/vlib/unix/input.c b/src/vlib/unix/input.c
index 7f49b95..1c1cb1a 100644 (file)
--- a/src/vlib/unix/input.c
+++ b/src/vlib/unix/input.c
@@ -145,9 +145,13 @@ linux_epoll_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
     vlib_node_main_t *nm = &vm->node_main;
     u32 ticks_until_expiration;
     f64 timeout;
+    f64 now;
     int timeout_ms = 0, max_timeout_ms = 10;
     f64 vector_rate = vlib_last_vectors_per_main_loop (vm);
 
+    if (is_main == 0)
+      now = vlib_time_now (vm);
+
     /*
      * If we've been asked for a fixed-sleep between main loop polls,
      * do so right away.
@@ -194,8 +198,9 @@ linux_epoll_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
          }
        node->input_main_loops_per_call = 0;
       }
-    else if (is_main == 0 && vector_rate < 2 &&
-            nm->input_node_counts_by_state[VLIB_NODE_STATE_POLLING] == 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)
       {
        timeout = 10e-3;
        timeout_ms = max_timeout_ms;
@@ -227,8 +232,27 @@ linux_epoll_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
       }
     else
       {
+       /*
+        * Worker thread, no epoll fd's, sleep for 100us at a time
+        * and check for a barrier sync request
+        */
        if (timeout_ms)
-         usleep (timeout_ms * 1000);
+         {
+           struct timespec ts, tsrem;
+           f64 limit = now + (f64) timeout_ms * 1e-3;
+
+           while (vlib_time_now (vm) < limit)
+             {
+               /* Sleep for 100us at a time */
+               ts.tv_sec = 0;
+               ts.tv_nsec = 1000 * 100;
+
+               while (nanosleep (&ts, &tsrem) < 0)
+                 ts = tsrem;
+               if (*vlib_worker_threads->wait_at_barrier)
+                 goto done;
+             }
+         }
        goto done;
       }
   }