Add -rt option to synch sim to wall time

	* Active during cpu power-down to avoid run-away
	  sim time. Useful for interactive applications.

1 files changed, 18 insertions, 0 deletions

diff --git a/func.c b/func.c
index 23bc31a..07f585c 100644
--- a/func.c
+++ b/func.c
@@ -63,6 +63,7 @@ uint32 last_load_addr = 0;
 int nouartrx = 0;
 int port = 1234;
 int sim_run = 0;
+int sync_rt = 0;
 
 /* RAM and ROM for all systems */
 char romb[ROM_SIZE];
@@ -1054,6 +1055,23 @@ pwd_enter (struct pstate *sregs)
   sregs->hold += delta;
 }
 
+void
+rt_sync()
+{
+  double walltime, realtime, dtime;
+  int64 stime;
+  stime = ebase.simtime - ebase.simstart;	/* Total simulated time */
+  realtime = (double) ((stime) / 1000000.0 / ebase.freq);
+  walltime = ebase.tottime + get_time () - ebase.starttime;
+  dtime = (realtime - walltime);
+  if (dtime > 0.001)
+  {
+    if (dtime > 1.0)
+      dtime = 0.1;
+    usleep ((useconds_t) (dtime * 1E6));
+  }
+}
+
 int
 check_bpt (sregs)
      struct pstate *sregs;