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-rw-r--r--src/vlib/main.h2
-rw-r--r--src/vlib/threads.c47
-rw-r--r--src/vlib/threads.h5
3 files changed, 53 insertions, 1 deletions
diff --git a/src/vlib/main.h b/src/vlib/main.h
index f7a4a1c912a..45a521a8667 100644
--- a/src/vlib/main.h
+++ b/src/vlib/main.h
@@ -133,7 +133,7 @@ typedef struct vlib_main_t
u64 cpu_time_main_loop_start;
/* Incremented once for each main loop. */
- u32 main_loop_count;
+ volatile u32 main_loop_count;
/* Count of vectors processed this main loop. */
u32 main_loop_vectors_processed;
diff --git a/src/vlib/threads.c b/src/vlib/threads.c
index 4df550e61fb..d5096c8cd18 100644
--- a/src/vlib/threads.c
+++ b/src/vlib/threads.c
@@ -1444,6 +1444,18 @@ vlib_worker_thread_initial_barrier_sync_and_release (vlib_main_t * vm)
*vlib_worker_threads->wait_at_barrier = 0;
}
+/**
+ * Return true if the wroker thread barrier is held
+ */
+u8
+vlib_worker_thread_barrier_held (void)
+{
+ if (vec_len (vlib_mains) < 2)
+ return (1);
+
+ return (*vlib_worker_threads->wait_at_barrier == 1);
+}
+
void
vlib_worker_thread_barrier_sync_int (vlib_main_t * vm, const char *func_name)
{
@@ -1647,6 +1659,41 @@ vlib_worker_thread_barrier_release (vlib_main_t * vm)
vm->clib_time.last_cpu_time, 1 /* leave */ );
}
+/**
+ * Wait until each of the workers has been once around the track
+ */
+void
+vlib_worker_wait_one_loop (void)
+{
+ ASSERT (vlib_get_thread_index () == 0);
+
+ if (vec_len (vlib_mains) < 2)
+ return;
+
+ if (vlib_worker_thread_barrier_held ())
+ return;
+
+ u32 *counts = 0;
+ u32 ii;
+
+ vec_validate (counts, vec_len (vlib_mains) - 1);
+
+ /* record the current loop counts */
+ vec_foreach_index (ii, vlib_mains)
+ counts[ii] = vlib_mains[ii]->main_loop_count;
+
+ /* spin until each changes, apart from the main thread, or we'd be
+ * a while */
+ for (ii = 1; ii < vec_len (counts); ii++)
+ {
+ while (counts[ii] == vlib_mains[ii]->main_loop_count)
+ CLIB_PAUSE ();
+ }
+
+ vec_free (counts);
+ return;
+}
+
/*
* Check the frame queue to see if any frames are available.
* If so, pull the packets off the frames and put them to
diff --git a/src/vlib/threads.h b/src/vlib/threads.h
index e8d416997b0..659f052a720 100644
--- a/src/vlib/threads.h
+++ b/src/vlib/threads.h
@@ -207,8 +207,13 @@ u32 vlib_frame_queue_main_init (u32 node_index, u32 frame_queue_nelts);
void vlib_worker_thread_barrier_sync_int (vlib_main_t * vm,
const char *func_name);
void vlib_worker_thread_barrier_release (vlib_main_t * vm);
+u8 vlib_worker_thread_barrier_held (void);
void vlib_worker_thread_initial_barrier_sync_and_release (vlib_main_t * vm);
void vlib_worker_thread_node_refork (void);
+/**
+ * Wait until each of the workers has been once around the track
+ */
+void vlib_worker_wait_one_loop (void);
static_always_inline uword
vlib_get_thread_index (void)