Case Study: Print liveness messages from Level-C tasks

Printing is too slow for many Level-A and -B tasks, so we limit it
to Level-C.

1 files changed, 7 insertions, 0 deletions

diff --git a/extra.h b/extra.h
index b1a4f2f..a16c671 100644
--- a/extra.h
+++ b/extra.h
@@ -415,6 +415,7 @@ out:
 // Start a job
 static void _rt_start_loop() {
 #if LITMUS
+    static lt_t last = 0;
     lt_t now = litmus_clock();
     if (now > _rt_cp->deadline) {
         fprintf(stderr, "(%s/%d:%lu) ", _rt_our_prog_name, gettid(), _rt_cp->job_index);
@@ -429,6 +430,12 @@ static void _rt_start_loop() {
                now - _rt_cp->deadline,
                (now - _rt_cp->deadline) / (double)_rt_period);
     }
+    if (last == 0) {
+        last = now;
+    } else if (now > last + 60ull * _BILLION && _rt_crit >= 2) {
+        last = now;
+        fprintf(stderr, "(%s/%d:%lu) Ping\n", _rt_our_prog_name, gettid(), _rt_cp->job_index);
+    }
     if (sleep_next_period() != 0) {
         perror("Unable to sleep for next period");
     }