1 files changed, 71 insertions, 0 deletions
diff --git a/gnuradio-core/src/lib/runtime/gr_realtime.cc b/gnuradio-core/src/lib/runtime/gr_realtime.cc
new file mode 100644
index 000000000..4f23ea0c6
--- /dev/null
+++ b/gnuradio-core/src/lib/runtime/gr_realtime.cc
@@ -0,0 +1,71 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2006 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 2, 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <gr_realtime.h>
+
+#ifdef HAVE_SCHED_H
+#include <sched.h>
+#endif
+
+#include <string.h>
+#include <errno.h>
+#include <stdio.h>
+
+#if defined(HAVE_SCHED_SETSCHEDULER)
+
+gr_rt_status_t
+gr_enable_realtime_scheduling()
+{
+  int policy = SCHED_FIFO;
+  int pri = (sched_get_priority_max (policy) - sched_get_priority_min (policy)) / 2;
+  int pid = 0;  // this process
+
+  struct sched_param param;
+  memset(&param, 0, sizeof(param));
+  param.sched_priority = pri;
+  int result = sched_setscheduler(pid, policy, &param);
+  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;
+}
+
+// #elif // could try negative niceness
+
+#else
+
+gr_rt_status_t
+gr_enable_realtime_scheduling()
+{
+  return RT_NOT_IMPLEMENTED;
+}
+
+#endif