+#if defined(HAVE_PTHREAD_SETSCHEDPARAM) || defined(HAVE_SCHED_SETSCHEDULER)
+#include <pthread.h>
+
+namespace gruel {
+
+ /*!
+ * Rescale our virtual priority so that it maps to the middle 1/2 of
+ * the priorities given by min_real_pri and max_real_pri.
+ */
+ static int
+ rescale_virtual_pri(int virtual_pri, int min_real_pri, int max_real_pri)
+ {
+ float rmin = min_real_pri + (0.25 * (max_real_pri - min_real_pri));
+ float rmax = min_real_pri + (0.75 * (max_real_pri - min_real_pri));
+ float m = (rmax - rmin) / (rt_priority_max() - rt_priority_min());
+ float y = m * (virtual_pri - rt_priority_min()) + rmin;
+ int y_int = static_cast<int>(rint(y));
+ return std::max(min_real_pri, std::min(max_real_pri, y_int));
+ }
+
+} // namespace gruel
+
+#endif
+
+
+#if defined(HAVE_PTHREAD_SETSCHEDPARAM)