From 168ab7279cec925e3db3e943e35d0d2bd220d8b3 Mon Sep 17 00:00:00 2001
From: Josh Blum <josh@joshknows.com>
Date: Wed, 16 Jun 2010 18:40:44 -0700
Subject: uhd: work on thread priority scheduling

---
 host/include/uhd/utils/CMakeLists.txt      |  1 +
 host/include/uhd/utils/thread_priority.hpp | 58 ++++++++++++++++++++++++++++++
 2 files changed, 59 insertions(+)
 create mode 100644 host/include/uhd/utils/thread_priority.hpp

(limited to 'host/include')

diff --git a/host/include/uhd/utils/CMakeLists.txt b/host/include/uhd/utils/CMakeLists.txt
index 3684fd6e7..c98eec639 100644
--- a/host/include/uhd/utils/CMakeLists.txt
+++ b/host/include/uhd/utils/CMakeLists.txt
@@ -25,5 +25,6 @@ INSTALL(FILES
     props.hpp
     safe_main.hpp
     static.hpp
+    thread_priority.hpp
     DESTINATION ${INCLUDE_DIR}/uhd/utils
 )
diff --git a/host/include/uhd/utils/thread_priority.hpp b/host/include/uhd/utils/thread_priority.hpp
new file mode 100644
index 000000000..988fc3012
--- /dev/null
+++ b/host/include/uhd/utils/thread_priority.hpp
@@ -0,0 +1,58 @@
+//
+// Copyright 2010 Ettus Research LLC
+//
+// This program 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 of the License, or
+// (at your option) any later version.
+//
+// This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#ifndef INCLUDED_UHD_UTILS_THREAD_PRIORITY_HPP
+#define INCLUDED_UHD_UTILS_THREAD_PRIORITY_HPP
+
+#include <uhd/config.hpp>
+
+namespace uhd{
+
+    static const float default_thread_priority = float(0.5);
+
+    /*!
+     * Set the scheduling priority on the current thread.
+     *
+     * A new thread or calling process should make this call
+     * with the defailts this to enable realtime scheduling.
+     *
+     * A priority of zero corresponds to normal priority.
+     * Positive priority values are higher than normal.
+     * Negative priority values are lower than normal.
+     *
+     * \param priority a value between -1 and 1
+     * \param realtime true to use realtime mode
+     * \throw exception on set priority failure
+     */
+    UHD_API void set_thread_priority(
+        float priority = default_thread_priority,
+        bool realtime = true
+    );
+
+    /*!
+     * Set the scheduling priority on the current thread.
+     * Same as set_thread_priority but does not throw on failure.
+     * \return true on success, false on failure
+     */
+    UHD_API bool set_thread_priority_safe(
+        float priority = default_thread_priority,
+        bool realtime = true
+    );
+
+} //namespace uhd
+
+#endif /* INCLUDED_UHD_UTILS_THREAD_PRIORITY_HPP */
-- 
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