Add -v (verbose) switch to rtspin.

Can be used to dump the delay loop that rtspin
is using.

1 files changed, 27 insertions, 9 deletions

diff --git a/bin/rtspin.c b/bin/rtspin.c
index 89ccbba..aa97745 100644
--- a/bin/rtspin.c
+++ b/bin/rtspin.c
@@ -38,6 +38,7 @@ void usage(char *error) {
 #define NUMS 4096
 static int num[NUMS];
 static double loop_length = 1.0;
+static char* progname;
 
 static int loop_once(void)
 {
@@ -100,10 +101,17 @@ static void configure_loop(void)
         fine_tune(0.1);
 }
 
+static void show_loop_length(void)
+{
+        printf("%s/%d: loop_length=%f (%ldus)\n",
+               progname, getpid(), loop_length,
+               (long) (loop_length * 1000000));
+}
+
 static void debug_delay_loop(void)
 {
         double start, end, delay;
-        printf("loop_length=%f\n", loop_length);
+        show_loop_length();
         while (1) {
                 for (delay = 0.5; delay > 0.01; delay -= 0.01) {
                         start = wctime();
@@ -125,7 +133,7 @@ static int job(double exec_time)
         return 0;
 }
 
-#define OPTSTR "p:c:wld:"
+#define OPTSTR "p:c:wld:v"
 
 int main(int argc, char** argv) 
 {
@@ -139,9 +147,12 @@ int main(int argc, char** argv)
         int wait = 0;
         int test_loop = 0;
         int skip_config = 0;
+        int verbose = 0;
         double duration, start;
         task_class_t class = RT_CLASS_HARD;
 
+        progname = argv[0];
+
         while ((opt = getopt(argc, argv, OPTSTR)) != -1) {
                 switch (opt) {
                 case 'w':
@@ -160,9 +171,14 @@ int main(int argc, char** argv)
                         test_loop = 1;
                         break;
                 case 'd':
-                        loop_length = atof(optarg) / 1000000;                   
+                        /* manually configure delay per loop iteration 
+                         * unit: microseconds */
+                        loop_length = atof(optarg) / 1000000;
                         skip_config = 1;
                         break;
+                case 'v':
+                        verbose = 1;
+                        break;
                 case ':':
                         usage("Argument missing.");
                         break;
@@ -173,7 +189,7 @@ int main(int argc, char** argv)
                 }
         }
 
-        
+
         if (!skip_config)
                 configure_loop();
 
@@ -183,7 +199,7 @@ int main(int argc, char** argv)
         }
 
         if (argc - optind < 3)
-                usage("Arguments missing.");       
+                usage("Arguments missing.");
         wcet_ms   = atof(argv[optind + 0]);
         period_ms = atof(argv[optind + 1]);
         duration  = atof(argv[optind + 2]);
@@ -206,15 +222,18 @@ int main(int argc, char** argv)
         }
 
         ret = sporadic_task_ns(wcet, period, 0, cpu, class, migrate);
-        
+
         if (ret < 0)
-                bail_out("could not become rt tasks.");
+                bail_out("could not setup rt task params");
+
+        if (verbose)
+                show_loop_length();
 
         init_litmus();
 
         ret = task_mode(LITMUS_RT_TASK);
         if (ret != 0)
-                bail_out("task_mode()");
+                bail_out("could not become RT task");
 
         if (wait) {
                 ret = wait_for_ts_release();
@@ -222,7 +241,6 @@ int main(int argc, char** argv)
                         bail_out("wait_for_ts_release()");
         }
 
-
         start = wctime();
 
         while (start + duration > wctime()) {