Round off sleep times -- makes timed scan threads work better when

high-quality time source (e.g. event receiver) is used.

src/RTEMS/base/rtems_init.c

@@ -42,7 +42,7 @@
 #include "epicsRtemsInitHooks.h"
 
 rtems_interval rtemsTicksPerSecond;
-double rtemsTicksPerSecond_double;
+double rtemsTicksPerSecond_double, rtemsTicksPerTwoSeconds_double;
 
 static void
 logReset (void)
@@ -416,6 +416,7 @@ Init (rtems_task_argument ignored)
      */
     rtems_clock_get (RTEMS_CLOCK_GET_TICKS_PER_SECOND, &rtemsTicksPerSecond);
 	rtemsTicksPerSecond_double = rtemsTicksPerSecond;
+	rtemsTicksPerTwoSeconds_double = rtemsTicksPerSecond_double * 2.0;
 
     /*
      * Explain why we're here

src/libCom/osi/os/RTEMS/osdThread.c

@@ -366,13 +366,14 @@ epicsThreadSleep (double seconds)
 {
     rtems_status_code sc;
     rtems_interval delay;
-    extern double rtemsTicksPerSecond_double;
+    extern double rtemsTicksPerTwoSeconds_double;
     
     if (seconds <= 0.0) {
         delay = 0;
     }
     else {
-        delay = seconds * rtemsTicksPerSecond_double;
+        delay = seconds * rtemsTicksPerTwoSeconds_double;
+        delay = (delay + 1) / 2;
         if (delay == 0)
             delay++;
     }