bugfix: switch operangs in delay computation

We want the positive loop length, not the negative, to prevent jobs
from overruning their budget.

1 files changed, 1 insertions, 1 deletions

diff --git a/bin/rtspin.c b/bin/rtspin.c
index 75e9494..2de60f5 100644
--- a/bin/rtspin.c
+++ b/bin/rtspin.c
@@ -134,7 +134,7 @@ static int loop_for(double exec_time, double emergency_exit)
                 loop_start = now;
                 tmp += loop_once();
                 now = cputime();
-                last_loop = loop_start - now;
+                last_loop = now - loop_start;
                 if (emergency_exit && wctime() > emergency_exit) {
                         /* Oops --- this should only be possible if the execution time tracking
                          * is broken in the LITMUS^RT kernel. */