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diff --git a/gnuradio-runtime/lib/realtime_impl.h b/gnuradio-runtime/lib/realtime_impl.h
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+++ b/gnuradio-runtime/lib/realtime_impl.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2006,2008,2013 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ */
+
+#ifndef INCLUDED_GNURADIO_REALTIME_H
+#define INCLUDED_GNURADIO_REALTIME_H
+
+#include <gnuradio/api.h>
+#include <gnuradio/realtime.h>
+#include <stdexcept>
+
+/*!
+ * \brief System independent way to ask for realtime scheduling
+ */
+namespace gr {
+namespace realtime {
+/*
+ * Define the range for our virtual priorities (don't change
+ * these)
+ *
+ * Processes (or threads) with numerically higher priority values
+ * are scheduled before processes with numerically lower priority
+ * values. Thus, the value returned by s_rt_priority_max will be
+ * greater than the value returned by s_rt_priority_min.
+ */
+static const int s_rt_priority_min = 0;
+static const int s_rt_priority_max = 15;
+static const int s_rt_priority_default = 1;
+
+struct GR_RUNTIME_API rt_sched_param {
+    int priority;
+    rt_sched_policy policy;
+
+    rt_sched_param() : priority(s_rt_priority_default), policy(RT_SCHED_RR) {}
+
+    rt_sched_param(int priority_, rt_sched_policy policy_ = RT_SCHED_RR)
+    {
+        if (priority_ < s_rt_priority_min || priority_ > s_rt_priority_max)
+            throw std::invalid_argument("rt_sched_param: priority out of range");
+
+        priority = priority_;
+        policy = policy_;
+    }
+};
+
+/*!
+ * \brief If possible, enable "realtime" scheduling.
+ * \ingroup misc
+ *
+ * In general, this means that the code will be scheduled before
+ * any non-realtime (normal) processes.  Note that if your code
+ * contains an non-blocking infinite loop and you enable realtime
+ * scheduling, it's possible to hang the system.
+ */
+
+GR_RUNTIME_API rt_status_t enable_realtime_scheduling(rt_sched_param = rt_sched_param());
+
+} /* namespace realtime */
+} /* namespace gr */
+
+#endif /* INCLUDED_GNURADIO_REALTIME_H */