From f3e2e07201c50033bf6c9d0c6a6f068557b4f17f Mon Sep 17 00:00:00 2001
From: Tom Rondeau <trondeau@vt.edu>
Date: Wed, 17 Apr 2013 13:43:52 -0400
Subject: runtime: converting runtime core to gr namespace, gnuradio include
dir.
---
gnuradio-runtime/lib/realtime_impl.cc | 178 ++++++++++++++++++++++++++++++++++
1 file changed, 178 insertions(+)
create mode 100644 gnuradio-runtime/lib/realtime_impl.cc
(limited to 'gnuradio-runtime/lib/realtime_impl.cc')
diff --git a/gnuradio-runtime/lib/realtime_impl.cc b/gnuradio-runtime/lib/realtime_impl.cc
new file mode 100644
index 0000000000..5dadc26bbd
--- /dev/null
+++ b/gnuradio-runtime/lib/realtime_impl.cc
@@ -0,0 +1,178 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2006,2007,2008 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <realtime.h>
+
+#ifdef HAVE_SCHED_H
+#include <sched.h>
+#endif
+
+#include <algorithm>
+#include <math.h>
+#include <string.h>
+#include <errno.h>
+#include <stdio.h>
+
+#if defined(HAVE_PTHREAD_SETSCHEDPARAM) || defined(HAVE_SCHED_SETSCHEDULER)
+#include <pthread.h>
+
+namespace gr {
+
+ /*!
+ * 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 gr
+
+#endif
+
+
+#if defined(HAVE_PTHREAD_SETSCHEDPARAM)
+
+namespace gr {
+
+ rt_status_t
+ enable_realtime_scheduling(rt_sched_param p)
+ {
+ int policy = p.policy == RT_SCHED_FIFO ? SCHED_FIFO : SCHED_RR;
+ int min_real_pri = sched_get_priority_min(policy);
+ int max_real_pri = sched_get_priority_max(policy);
+ int pri = rescale_virtual_pri(p.priority, min_real_pri, max_real_pri);
+
+ // FIXME check hard and soft limits with getrlimit, and limit the value we ask for.
+ // fprintf(stderr, "pthread_setschedparam: policy = %d, pri = %d\n", policy, pri);
+
+ struct sched_param param;
+ memset (¶m, 0, sizeof (param));
+ param.sched_priority = pri;
+ int result = pthread_setschedparam (pthread_self(), policy, ¶m);
+ if (result != 0) {
+ if (result == EPERM) // N.B., return value, not errno
+ return RT_NO_PRIVS;
+ else {
+ fprintf(stderr,
+ "pthread_setschedparam: failed to set real time priority: %s\n",
+ strerror(result));
+ return RT_OTHER_ERROR;
+ }
+ }
+
+ //printf("SCHED_FIFO enabled with priority = %d\n", pri);
+ return RT_OK;
+ }
+} // namespace gr
+
+
+#elif defined(HAVE_SCHED_SETSCHEDULER)
+
+namespace gr {
+
+ rt_status_t
+ enable_realtime_scheduling(rt_sched_param p)
+ {
+ int policy = p.policy == RT_SCHED_FIFO ? SCHED_FIFO : SCHED_RR;
+ int min_real_pri = sched_get_priority_min(policy);
+ int max_real_pri = sched_get_priority_max(policy);
+ int pri = rescale_virtual_pri(p.priority, min_real_pri, max_real_pri);
+
+ // FIXME check hard and soft limits with getrlimit, and limit the value we ask for.
+ // fprintf(stderr, "sched_setscheduler: policy = %d, pri = %d\n", policy, pri);
+
+ int pid = 0; // this process
+ struct sched_param param;
+ memset(¶m, 0, sizeof(param));
+ param.sched_priority = pri;
+ int result = sched_setscheduler(pid, policy, ¶m);
+ if (result != 0){
+ if (errno == EPERM)
+ return RT_NO_PRIVS;
+ else {
+ perror ("sched_setscheduler: failed to set real time priority");
+ return RT_OTHER_ERROR;
+ }
+ }
+
+ //printf("SCHED_FIFO enabled with priority = %d\n", pri);
+ return RT_OK;
+ }
+
+} // namespace gr
+
+#elif defined(_WIN32) || defined(__WIN32__) || defined(WIN32)
+
+#include <windows.h>
+
+namespace gr {
+
+ rt_status_t enable_realtime_scheduling(rt_sched_param p){
+
+ //set the priority class on the process
+ int pri_class = (true)? REALTIME_PRIORITY_CLASS : NORMAL_PRIORITY_CLASS;
+ if (SetPriorityClass(GetCurrentProcess(), pri_class) == 0)
+ return RT_OTHER_ERROR;
+
+ //scale the priority value to the constants
+ int priorities[] = {
+ THREAD_PRIORITY_IDLE, THREAD_PRIORITY_LOWEST, THREAD_PRIORITY_BELOW_NORMAL, THREAD_PRIORITY_NORMAL,
+ THREAD_PRIORITY_ABOVE_NORMAL, THREAD_PRIORITY_HIGHEST, THREAD_PRIORITY_TIME_CRITICAL
+ };
+ const double priority = double(p.priority)/(rt_priority_max() - rt_priority_min());
+ size_t pri_index = size_t((priority+1.0)*6/2.0); // -1 -> 0, +1 -> 6
+ pri_index %= sizeof(priorities)/sizeof(*priorities); //range check
+
+ //set the thread priority on the thread
+ if (SetThreadPriority(GetCurrentThread(), priorities[pri_index]) == 0)
+ return RT_OTHER_ERROR;
+
+ //printf("SetPriorityClass + SetThreadPriority\n");
+ return RT_OK;
+ }
+
+} // namespace gr
+
+#else
+
+namespace gr {
+
+ rt_status_t
+ enable_realtime_scheduling(rt_sched_param p)
+ {
+ return RT_NOT_IMPLEMENTED;
+ }
+} // namespace gr
+
+#endif
--
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