9 files changed, 711 insertions, 0 deletions
diff --git a/host/lib/utils/CMakeLists.txt b/host/lib/utils/CMakeLists.txt
new file mode 100644
index 000000000..32b679d49
--- /dev/null
+++ b/host/lib/utils/CMakeLists.txt
@@ -0,0 +1,88 @@
+#
+# 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/>.
+#
+
+#This file will be included by cmake, use absolute paths!
+
+########################################################################
+# Setup defines for process scheduling
+########################################################################
+MESSAGE(STATUS "Configuring priority scheduling...")
+
+INCLUDE(CheckCXXSourceCompiles)
+CHECK_CXX_SOURCE_COMPILES("
+    #include <pthread.h>
+    int main(){
+        struct sched_param sp;
+        pthread_setschedparam(pthread_self(), SCHED_RR, &sp);
+        return 0;
+    }
+    " HAVE_PTHREAD_SETSCHEDPARAM
+)
+
+CHECK_CXX_SOURCE_COMPILES("
+    #include <windows.h>
+    int main(){
+        SetThreadPriority(GetCurrentThread(), 0);
+        SetPriorityClass(GetCurrentProcess(), 0);
+        return 0;
+    }
+    " HAVE_WIN_SETTHREADPRIORITY
+)
+
+IF(HAVE_PTHREAD_SETSCHEDPARAM)
+    MESSAGE(STATUS "  Priority scheduling supported through pthread_setschedparam.")
+    ADD_DEFINITIONS(-DHAVE_PTHREAD_SETSCHEDPARAM)
+ELSEIF(HAVE_WIN_SETTHREADPRIORITY)
+    MESSAGE(STATUS "  Priority scheduling supported through windows SetThreadPriority.")
+    ADD_DEFINITIONS(-DHAVE_WIN_SETTHREADPRIORITY)
+ELSE(HAVE_PTHREAD_SETSCHEDPARAM)
+    MESSAGE(STATUS "  Priority scheduling not supported.")
+ENDIF(HAVE_PTHREAD_SETSCHEDPARAM)
+
+########################################################################
+# Setup defines for module loading
+########################################################################
+MESSAGE(STATUS "Configuring module loading...")
+
+INCLUDE(CheckIncludeFileCXX)
+CHECK_INCLUDE_FILE_CXX(dlfcn.h HAVE_DLFCN_H)
+CHECK_INCLUDE_FILE_CXX(windows.h HAVE_WINDOWS_H)
+
+IF(HAVE_DLFCN_H)
+    MESSAGE(STATUS "  Module loading supported through dlopen.")
+    ADD_DEFINITIONS(-DHAVE_DLFCN_H)
+    LIBUHD_APPEND_LIBS(${CMAKE_DL_LIBS})
+ELSEIF(HAVE_WINDOWS_H)
+    MESSAGE(STATUS "  Module loading supported through LoadLibrary.")
+    ADD_DEFINITIONS(-DHAVE_WINDOWS_H)
+ELSE(HAVE_DLFCN_H)
+    MESSAGE(STATUS "  Module loading not supported.")
+ENDIF(HAVE_DLFCN_H)
+
+########################################################################
+# Append sources
+########################################################################
+LIBUHD_APPEND_SOURCES(
+    ${CMAKE_SOURCE_DIR}/lib/utils/assert.cpp
+    ${CMAKE_SOURCE_DIR}/lib/utils/gain_group.cpp
+    ${CMAKE_SOURCE_DIR}/lib/utils/images.cpp
+    ${CMAKE_SOURCE_DIR}/lib/utils/load_modules.cpp
+    ${CMAKE_SOURCE_DIR}/lib/utils/paths.cpp
+    ${CMAKE_SOURCE_DIR}/lib/utils/props.cpp
+    ${CMAKE_SOURCE_DIR}/lib/utils/thread_priority.cpp
+    ${CMAKE_SOURCE_DIR}/lib/utils/warning.cpp
+)
diff --git a/host/lib/utils/assert.cpp b/host/lib/utils/assert.cpp
new file mode 100644
index 000000000..7ace9024c
--- /dev/null
+++ b/host/lib/utils/assert.cpp
@@ -0,0 +1,24 @@
+//
+// 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/>.
+//
+
+#include <uhd/utils/assert.hpp>
+
+using namespace uhd;
+
+assert_error::assert_error(const std::string &what) : std::runtime_error(what){
+    /* NOP */
+}
diff --git a/host/lib/utils/gain_group.cpp b/host/lib/utils/gain_group.cpp
new file mode 100644
index 000000000..54146726a
--- /dev/null
+++ b/host/lib/utils/gain_group.cpp
@@ -0,0 +1,186 @@
+//
+// 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/>.
+//
+
+#include <uhd/utils/gain_group.hpp>
+#include <uhd/types/dict.hpp>
+#include <uhd/utils/algorithm.hpp>
+#include <uhd/utils/assert.hpp>
+#include <boost/foreach.hpp>
+#include <boost/bind.hpp>
+#include <algorithm>
+#include <vector>
+#include <iostream>
+
+using namespace uhd;
+
+static const bool verbose = false;
+
+static bool compare_by_step_size(
+    const size_t &rhs, const size_t &lhs, std::vector<gain_fcns_t> &fcns
+){
+    return fcns.at(rhs).get_range().step > fcns.at(lhs).get_range().step;
+}
+
+/*!
+ * Get a multiple of step with the following relation:
+ *     result = step*floor(num/step)
+ *
+ * Due to small floating-point inaccuracies:
+ *     num = n*step + e, where e is a small inaccuracy.
+ * When e is negative, floor would yeild (n-1)*step,
+ * despite that n*step is really the desired result.
+ * This function is designed to mitigate that issue.
+ *
+ * \param num the number to approximate
+ * \param step the step size to round with
+ * \param e the small inaccuracy to account for
+ * \return a multiple of step approximating num
+ */
+template <typename T> static T floor_step(T num, T step, T e = T(0.001)){
+    return step*int(num/step + e);
+}
+
+/***********************************************************************
+ * gain group implementation
+ **********************************************************************/
+class gain_group_impl : public gain_group{
+public:
+    gain_group_impl(void){
+        /*NOP*/
+    }
+
+    gain_range_t get_range(const std::string &name){
+        if (not name.empty()) return _name_to_fcns[name].get_range();
+
+        float overall_min = 0, overall_max = 0, overall_step = 0;
+        BOOST_FOREACH(const gain_fcns_t &fcns, get_all_fcns()){
+            const gain_range_t range = fcns.get_range();
+            overall_min += range.min;
+            overall_max += range.max;
+            //the overall step is the min (zero is invalid, first run)
+            if (overall_step == 0) overall_step = range.step;
+            overall_step = std::min(overall_step, range.step);
+        }
+        return gain_range_t(overall_min, overall_max, overall_step);
+    }
+
+    float get_value(const std::string &name){
+        if (not name.empty()) return _name_to_fcns[name].get_value();
+
+        float overall_gain = 0;
+        BOOST_FOREACH(const gain_fcns_t &fcns, get_all_fcns()){
+            overall_gain += fcns.get_value();
+        }
+        return overall_gain;
+    }
+
+    void set_value(float gain, const std::string &name){
+        if (not name.empty()) return _name_to_fcns[name].set_value(gain);
+
+        std::vector<gain_fcns_t> all_fcns = get_all_fcns();
+        if (all_fcns.size() == 0) return; //nothing to set!
+
+        //get the max step size among the gains
+        float max_step = 0;
+        BOOST_FOREACH(const gain_fcns_t &fcns, all_fcns){
+            max_step = std::max(max_step, fcns.get_range().step);
+        }
+
+        //create gain bucket to distribute power
+        std::vector<float> gain_bucket;
+
+        //distribute power according to priority (round to max step)
+        float gain_left_to_distribute = gain;
+        BOOST_FOREACH(const gain_fcns_t &fcns, all_fcns){
+            const gain_range_t range = fcns.get_range();
+            gain_bucket.push_back(floor_step(std::clip(
+                gain_left_to_distribute, range.min, range.max
+            ), max_step));
+            gain_left_to_distribute -= gain_bucket.back();
+        }
+
+        //get a list of indexes sorted by step size large to small
+        std::vector<size_t> indexes_step_size_dec;
+        for (size_t i = 0; i < all_fcns.size(); i++){
+            indexes_step_size_dec.push_back(i);
+        }
+        std::sort(
+            indexes_step_size_dec.begin(), indexes_step_size_dec.end(),
+            boost::bind(&compare_by_step_size, _1, _2, all_fcns)
+        );
+        UHD_ASSERT_THROW(
+            all_fcns.at(indexes_step_size_dec.front()).get_range().step >=
+            all_fcns.at(indexes_step_size_dec.back()).get_range().step
+        );
+
+        //distribute the remainder (less than max step)
+        //fill in the largest step sizes first that are less than the remainder
+        BOOST_FOREACH(size_t i, indexes_step_size_dec){
+            const gain_range_t range = all_fcns.at(i).get_range();
+            float additional_gain = floor_step(std::clip(
+                gain_bucket.at(i) + gain_left_to_distribute, range.min, range.max
+            ), range.step) - gain_bucket.at(i);
+            gain_bucket.at(i) += additional_gain;
+            gain_left_to_distribute -= additional_gain;
+        }
+        if (verbose) std::cout << "gain_left_to_distribute " << gain_left_to_distribute << std::endl;
+
+        //now write the bucket out to the individual gain values
+        for (size_t i = 0; i < gain_bucket.size(); i++){
+            if (verbose) std::cout << gain_bucket.at(i) << std::endl;
+            all_fcns.at(i).set_value(gain_bucket.at(i));
+        }
+    }
+
+    const std::vector<std::string> get_names(void){
+        return _name_to_fcns.keys();
+    }
+
+    void register_fcns(
+        const std::string &name,
+        const gain_fcns_t &gain_fcns,
+        size_t priority
+    ){
+        if (name.empty() or _name_to_fcns.has_key(name)){
+            //ensure the name name is unique and non-empty
+            return register_fcns(name + "_", gain_fcns, priority);
+        }
+        _registry[priority].push_back(gain_fcns);
+        _name_to_fcns[name] = gain_fcns;
+    }
+
+private:
+    //! get the gain function sets in order (highest priority first)
+    std::vector<gain_fcns_t> get_all_fcns(void){
+        std::vector<gain_fcns_t> all_fcns;
+        BOOST_FOREACH(size_t key, std::sorted(_registry.keys())){
+            const std::vector<gain_fcns_t> &fcns = _registry[key];
+            all_fcns.insert(all_fcns.begin(), fcns.begin(), fcns.end());
+        }
+        return all_fcns;
+    }
+
+    uhd::dict<size_t, std::vector<gain_fcns_t> > _registry;
+    uhd::dict<std::string, gain_fcns_t> _name_to_fcns;
+};
+
+/***********************************************************************
+ * gain group factory function
+ **********************************************************************/
+gain_group::sptr gain_group::make(void){
+    return sptr(new gain_group_impl());
+}
diff --git a/host/lib/utils/images.cpp b/host/lib/utils/images.cpp
new file mode 100644
index 000000000..395e542c1
--- /dev/null
+++ b/host/lib/utils/images.cpp
@@ -0,0 +1,40 @@
+//
+// 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/>.
+//
+
+#include <uhd/utils/images.hpp>
+#include <boost/foreach.hpp>
+#include <boost/filesystem.hpp>
+#include <stdexcept>
+#include <vector>
+
+namespace fs = boost::filesystem;
+
+std::vector<fs::path> get_image_paths(void); //defined in paths.cpp
+
+/***********************************************************************
+ * Find a image in the image paths
+ **********************************************************************/
+std::string uhd::find_image_path(const std::string &image_name){
+    if (fs::exists(image_name)){
+        return fs::system_complete(image_name).file_string();
+    }
+    BOOST_FOREACH(const fs::path &path, get_image_paths()){
+        fs::path image_path = path / image_name;
+        if (fs::exists(image_path)) return image_path.file_string();
+    }
+    throw std::runtime_error("Could not find path for image: " + image_name);
+}
diff --git a/host/lib/utils/load_modules.cpp b/host/lib/utils/load_modules.cpp
new file mode 100644
index 000000000..623d31eb6
--- /dev/null
+++ b/host/lib/utils/load_modules.cpp
@@ -0,0 +1,109 @@
+//
+// 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/>.
+//
+
+#include <uhd/utils/static.hpp>
+#include <boost/format.hpp>
+#include <boost/foreach.hpp>
+#include <boost/filesystem.hpp>
+#include <iostream>
+#include <stdexcept>
+#include <string>
+#include <vector>
+
+namespace fs = boost::filesystem;
+
+/***********************************************************************
+ * Module Load Function
+ **********************************************************************/
+#if defined(HAVE_DLFCN_H)
+#include <dlfcn.h>
+
+static void load_module(const std::string &file_name){
+    if (dlopen(file_name.c_str(), RTLD_LAZY) == NULL){
+        throw std::runtime_error(str(
+            boost::format("dlopen failed to load \"%s\"") % file_name
+        ));
+    }
+}
+
+#elif defined(HAVE_WINDOWS_H)
+#include <windows.h>
+
+static void load_module(const std::string &file_name){
+    if (LoadLibrary(file_name.c_str()) == NULL){
+        throw std::runtime_error(str(
+            boost::format("LoadLibrary failed to load \"%s\"") % file_name
+        ));
+    }
+}
+
+#else
+
+static void load_module(const std::string &file_name){
+    throw std::runtime_error(str(
+        boost::format("Module loading not supported: Cannot load \"%s\"") % file_name
+    ));
+}
+
+#endif
+
+/***********************************************************************
+ * Load Modules
+ **********************************************************************/
+/*!
+ * Load all modules in a given path.
+ * This will recurse into sub-directories.
+ * Does not throw, prints to std error.
+ * \param path the filesystem path
+ */
+static void load_module_path(const fs::path &path){
+    if (not fs::exists(path)){
+        //std::cerr << boost::format("Module path \"%s\" not found.") % path.file_string() << std::endl;
+        return;
+    }
+
+    //try to load the files in this path
+    if (fs::is_directory(path)){
+        for(
+            fs::directory_iterator dir_itr(path);
+            dir_itr != fs::directory_iterator();
+            ++dir_itr
+        ){
+            load_module_path(dir_itr->path());
+        }
+        return;
+    }
+
+    //its not a directory, try to load it
+    try{
+        load_module(path.file_string());
+    }
+    catch(const std::exception &err){
+        std::cerr << boost::format("Error: %s") % err.what() << std::endl;
+    }
+}
+
+std::vector<fs::path> get_module_paths(void); //defined in paths.cpp
+
+/*!
+ * Load all the modules given in the module paths.
+ */
+UHD_STATIC_BLOCK(load_modules){
+    BOOST_FOREACH(const fs::path &path, get_module_paths()){
+        load_module_path(path);
+    }
+}
diff --git a/host/lib/utils/paths.cpp b/host/lib/utils/paths.cpp
new file mode 100644
index 000000000..9e9525caf
--- /dev/null
+++ b/host/lib/utils/paths.cpp
@@ -0,0 +1,87 @@
+//
+// 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/>.
+//
+
+#include "constants.hpp"
+#include <uhd/config.hpp>
+#include <uhd/utils/algorithm.hpp>
+#include <boost/program_options.hpp>
+#include <boost/filesystem.hpp>
+#include <boost/foreach.hpp>
+#include <boost/bind.hpp>
+#include <stdexcept>
+#include <string>
+#include <vector>
+
+namespace po = boost::program_options;
+namespace fs = boost::filesystem;
+
+/***********************************************************************
+ * Determine the paths separator
+ **********************************************************************/
+#ifdef UHD_PLATFORM_WIN32
+    static const std::string env_path_sep = ";";
+#else
+    static const std::string env_path_sep = ":";
+#endif /*UHD_PLATFORM_WIN32*/
+
+/***********************************************************************
+ * Get a list of paths for an environment variable
+ **********************************************************************/
+static std::string name_mapper(const std::string &key, const std::string &var_name){
+    return (var_name == key)? var_name : "";
+}
+
+static std::vector<fs::path> get_env_paths(const std::string &var_name){
+    //register the options
+    std::string var_value;
+    po::options_description desc;
+    desc.add_options()
+        (var_name.c_str(), po::value<std::string>(&var_value)->default_value(""))
+    ;
+
+    //parse environment variables
+    po::variables_map vm;
+    po::store(po::parse_environment(desc, boost::bind(&name_mapper, var_name, _1)), vm);
+    po::notify(vm);
+
+    //convert to filesystem path, filter blank paths
+    std::vector<fs::path> paths;
+    BOOST_FOREACH(const std::string &path_string, std::split_string(var_value, env_path_sep)){
+        if (path_string.empty()) continue;
+        paths.push_back(fs::system_complete(path_string));
+    }
+    return paths;
+}
+
+/***********************************************************************
+ * Get a list of special purpose paths
+ **********************************************************************/
+std::vector<fs::path> get_image_paths(void){
+    std::vector<fs::path> paths = get_env_paths("UHD_IMAGE_PATH");
+    paths.push_back(fs::path(LOCAL_PKG_DATA_DIR) / "images");
+    if (not std::string(INSTALLER_PKG_DATA_DIR).empty())
+        paths.push_back(fs::path(INSTALLER_PKG_DATA_DIR) / "images");
+    return paths;
+}
+
+std::vector<fs::path> get_module_paths(void){
+    std::vector<fs::path> paths = get_env_paths("UHD_MODULE_PATH");
+    paths.push_back(fs::path(LOCAL_PKG_DATA_DIR) / "modules");
+    if (not std::string(INSTALLER_PKG_DATA_DIR).empty())
+        paths.push_back(fs::path(INSTALLER_PKG_DATA_DIR) / "modules");
+    return paths;
+}
diff --git a/host/lib/utils/props.cpp b/host/lib/utils/props.cpp
new file mode 100644
index 000000000..fc9f8e63f
--- /dev/null
+++ b/host/lib/utils/props.cpp
@@ -0,0 +1,40 @@
+//
+// 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/>.
+//
+
+#include <uhd/utils/props.hpp>
+
+using namespace uhd;
+
+named_prop_t::named_prop_t(
+    const wax::obj &key,
+    const std::string &name
+):
+    key(key),
+    name(name)
+{
+    /* NOP */
+}
+
+named_prop_t named_prop_t::extract(
+    const wax::obj &key,
+    const std::string &name
+){
+    if (key.type() == typeid(named_prop_t)){
+        return key.as<named_prop_t>();
+    }
+    return named_prop_t(key, name);
+}
diff --git a/host/lib/utils/thread_priority.cpp b/host/lib/utils/thread_priority.cpp
new file mode 100644
index 000000000..f09d1b1d6
--- /dev/null
+++ b/host/lib/utils/thread_priority.cpp
@@ -0,0 +1,105 @@
+//
+// 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/>.
+//
+
+#include <uhd/utils/thread_priority.hpp>
+#include <uhd/utils/warning.hpp>
+#include <boost/format.hpp>
+#include <stdexcept>
+#include <iostream>
+
+bool uhd::set_thread_priority_safe(float priority, bool realtime){
+    try{
+        set_thread_priority(priority, realtime);
+        return true;
+    }catch(const std::exception &e){
+        uhd::print_warning(str(boost::format(
+            "%s\n"
+            "Failed to set thread priority %d (%s):\n"
+            "Performance may be negatively affected.\n"
+            "See the general application notes.\n"
+        ) % e.what() % priority % (realtime?"realtime":"")));
+        return false;
+    }
+}
+
+static void check_priority_range(float priority){
+    if (priority > +1.0 or priority < -1.0)
+        throw std::range_error("priority out of range [-1.0, +1.0]");
+}
+
+/***********************************************************************
+ * Pthread API to set priority
+ **********************************************************************/
+#if defined(HAVE_PTHREAD_SETSCHEDPARAM)
+    #include <pthread.h>
+
+    void uhd::set_thread_priority(float priority, bool realtime){
+        check_priority_range(priority);
+
+        //when realtime is not enabled, use sched other
+        int policy = (realtime)? SCHED_RR : SCHED_OTHER;
+
+        //we cannot have below normal priority, set to zero
+        if (priority < 0) priority = 0;
+
+        //get the priority bounds for the selected policy
+        int min_pri = sched_get_priority_min(policy);
+        int max_pri = sched_get_priority_max(policy);
+        if (min_pri == -1 or max_pri == -1) throw std::runtime_error("error in sched_get_priority_min/max");
+
+        //set the new priority and policy
+        sched_param sp;
+        sp.sched_priority = int(priority*(max_pri - min_pri)) + min_pri;
+        int ret = pthread_setschedparam(pthread_self(), policy, &sp);
+        if (ret != 0) throw std::runtime_error("error in pthread_setschedparam");
+    }
+
+/***********************************************************************
+ * Windows API to set priority
+ **********************************************************************/
+#elif defined(HAVE_WIN_SETTHREADPRIORITY)
+    #include <windows.h>
+
+    void uhd::set_thread_priority(float priority, bool realtime){
+        check_priority_range(priority);
+
+        //set the priority class on the process
+        int pri_class = (realtime)? REALTIME_PRIORITY_CLASS : NORMAL_PRIORITY_CLASS;
+        if (SetPriorityClass(GetCurrentProcess(), pri_class) == 0)
+            throw std::runtime_error("error in SetPriorityClass");
+
+        //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
+        };
+        size_t pri_index = size_t((priority+1.0)*6/2.0); // -1 -> 0, +1 -> 6
+
+        //set the thread priority on the thread
+        if (SetThreadPriority(GetCurrentThread(), priorities[pri_index]) == 0)
+            throw std::runtime_error("error in SetThreadPriority");
+    }
+
+/***********************************************************************
+ * Unimplemented API to set priority
+ **********************************************************************/
+#else
+    void uhd::set_thread_priority(float, bool){
+        throw std::runtime_error("set thread priority not implemented");
+    }
+
+#endif /* HAVE_PTHREAD_SETSCHEDPARAM */
diff --git a/host/lib/utils/warning.cpp b/host/lib/utils/warning.cpp
new file mode 100644
index 000000000..8a7d35a23
--- /dev/null
+++ b/host/lib/utils/warning.cpp
@@ -0,0 +1,32 @@
+//
+// 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/>.
+//
+
+#include <uhd/utils/warning.hpp>
+#include <uhd/utils/algorithm.hpp>
+#include <boost/foreach.hpp>
+#include <iostream>
+#include <vector>
+
+using namespace uhd;
+
+void uhd::print_warning(const std::string &msg){
+    //print the warning message
+    std::cerr << std::endl << "Warning:" << std::endl;
+    BOOST_FOREACH(const std::string &line, std::split_string(msg, "\n")){
+        std::cerr << "    " << line << std::endl;
+    }
+}