Merge branch 'usrp2_fw_clock_cleanup' into usrp2_dual_dsp

8 files changed, 174 insertions, 190 deletions

diff --git a/host/lib/transport/CMakeLists.txt b/host/lib/transport/CMakeLists.txt
index a98bcc14e..a5bf9c5f1 100644
--- a/host/lib/transport/CMakeLists.txt
+++ b/host/lib/transport/CMakeLists.txt
@@ -48,20 +48,31 @@ ENDIF(ENABLE_USB)
 ########################################################################
 MESSAGE(STATUS "")
 MESSAGE(STATUS "Configuring interface address discovery...")
-
+INCLUDE(CheckCXXSourceCompiles)
 INCLUDE(CheckIncludeFileCXX)
-CHECK_INCLUDE_FILE_CXX(ifaddrs.h HAVE_IFADDRS_H)
+
+CHECK_CXX_SOURCE_COMPILES("
+    #include <ifaddrs.h>
+    int main(){
+        struct ifaddrs *ifap;
+        getifaddrs(&ifap);
+        return 0;
+    }
+    " HAVE_GETIFADDRS
+)
+
 CHECK_INCLUDE_FILE_CXX(winsock2.h HAVE_WINSOCK2_H)
 
-IF(HAVE_IFADDRS_H)
+IF(HAVE_GETIFADDRS)
     MESSAGE(STATUS "  Interface address discovery supported through getifaddrs.")
-    SET(IF_ADDRS_DEFS HAVE_IFADDRS_H)
+    SET(IF_ADDRS_DEFS HAVE_GETIFADDRS)
 ELSEIF(HAVE_WINSOCK2_H)
     MESSAGE(STATUS "  Interface address discovery supported through SIO_GET_INTERFACE_LIST.")
-    SET(IF_ADDRS_DEFS HAVE_WINSOCK2_H)
-ELSE(HAVE_IFADDRS_H)
+    SET(IF_ADDRS_DEFS HAVE_SIO_GET_INTERFACE_LIST)
+ELSE()
     MESSAGE(STATUS "  Interface address discovery not supported.")
-ENDIF(HAVE_IFADDRS_H)
+    SET(IF_ADDRS_DEFS HAVE_IF_ADDRS_DUMMY)
+ENDIF()
 
 SET_SOURCE_FILES_PROPERTIES(
     ${CMAKE_CURRENT_SOURCE_DIR}/if_addrs.cpp
@@ -80,6 +91,6 @@ LIBUHD_APPEND_SOURCES(
     ${CMAKE_CURRENT_SOURCE_DIR}/buffer_pool.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/if_addrs.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/udp_simple.cpp
-    ${CMAKE_CURRENT_SOURCE_DIR}/udp_zero_copy_asio.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/udp_zero_copy.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/vrt_packet_handler.hpp
 )
diff --git a/host/lib/transport/if_addrs.cpp b/host/lib/transport/if_addrs.cpp
index 17cf8455b..b7c8ad844 100644
--- a/host/lib/transport/if_addrs.cpp
+++ b/host/lib/transport/if_addrs.cpp
@@ -20,14 +20,10 @@
 #include <boost/cstdint.hpp>
 #include <iostream>
 
-uhd::transport::if_addrs_t::if_addrs_t(void){
-    /* NOP */
-}
-
 /***********************************************************************
  * Interface address discovery through ifaddrs api
  **********************************************************************/
-#if defined(HAVE_IFADDRS_H)
+#ifdef HAVE_GETIFADDRS
 #include <ifaddrs.h>
 
 static boost::asio::ip::address_v4 sockaddr_to_ip_addr(sockaddr *addr){
@@ -59,10 +55,12 @@ std::vector<uhd::transport::if_addrs_t> uhd::transport::get_if_addrs(void){
     return if_addrs;
 }
 
+#endif /* HAVE_GETIFADDRS */
+
 /***********************************************************************
  * Interface address discovery through windows api
  **********************************************************************/
-#elif defined(HAVE_WINSOCK2_H)
+#ifdef HAVE_SIO_GET_INTERFACE_LIST
 #include <winsock2.h>
 
 std::vector<uhd::transport::if_addrs_t> uhd::transport::get_if_addrs(void){
@@ -98,13 +96,15 @@ std::vector<uhd::transport::if_addrs_t> uhd::transport::get_if_addrs(void){
     return if_addrs;
 }
 
+#endif /* HAVE_SIO_GET_INTERFACE_LIST */
+
 /***********************************************************************
  * Interface address discovery not included
  **********************************************************************/
-#else /* HAVE_IFADDRS_H */
+#ifdef HAVE_IF_ADDRS_DUMMY
 
 std::vector<uhd::transport::if_addrs_t> uhd::transport::get_if_addrs(void){
     return std::vector<if_addrs_t>();
 }
 
-#endif /* HAVE_IFADDRS_H */
+#endif /* HAVE_IF_ADDRS_DUMMY */
diff --git a/host/lib/transport/udp_common.hpp b/host/lib/transport/udp_common.hpp
new file mode 100644
index 000000000..47775d9c4
--- /dev/null
+++ b/host/lib/transport/udp_common.hpp
@@ -0,0 +1,53 @@
+//
+// Copyright 2011 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_LIBUHD_TRANSPORT_VRT_PACKET_HANDLER_HPP
+#define INCLUDED_LIBUHD_TRANSPORT_VRT_PACKET_HANDLER_HPP
+
+#include <uhd/config.hpp>
+#include <boost/asio.hpp>
+
+namespace uhd{ namespace transport{
+
+    typedef boost::shared_ptr<boost::asio::ip::udp::socket> socket_sptr;
+
+    /*!
+     * Wait for the socket to become ready for a receive operation.
+     * \param sock_fd the open socket file descriptor
+     * \param timeout the timeout duration in seconds
+     * \return true when the socket is ready for receive
+     */
+    UHD_INLINE bool wait_for_recv_ready(int sock_fd, double timeout){
+        //setup timeval for timeout
+        timeval tv;
+        //If the tv_usec > 1 second on some platforms, select will
+        //error EINVAL: An invalid timeout interval was specified.
+        tv.tv_sec = int(timeout);
+        tv.tv_usec = int(timeout*1000000)%1000000;
+
+        //setup rset for timeout
+        fd_set rset;
+        FD_ZERO(&rset);
+        FD_SET(sock_fd, &rset);
+
+        //call select with timeout on receive socket
+        return ::select(sock_fd+1, &rset, NULL, NULL, &tv) > 0;
+    }
+
+}} //namespace uhd::transport
+
+#endif /* INCLUDED_LIBUHD_TRANSPORT_VRT_PACKET_HANDLER_HPP */
diff --git a/host/lib/transport/udp_simple.cpp b/host/lib/transport/udp_simple.cpp
index 6799ac7b2..1ee036d52 100644
--- a/host/lib/transport/udp_simple.cpp
+++ b/host/lib/transport/udp_simple.cpp
@@ -1,5 +1,5 @@
 //
-// Copyright 2010 Ettus Research LLC
+// Copyright 2010-2011 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
@@ -15,159 +15,69 @@
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 //
 
+#include "udp_common.hpp"
 #include <uhd/transport/udp_simple.hpp>
-#include <boost/asio.hpp>
-#include <boost/thread.hpp>
 #include <boost/format.hpp>
 #include <iostream>
 
 using namespace uhd::transport;
+namespace asio = boost::asio;
 
 /***********************************************************************
- * Helper Functions
+ * UDP simple implementation: connected and broadcast
  **********************************************************************/
-/*!
- * Wait for available data or timeout.
- * \param socket the asio socket
- * \param timeout the timeout in seconds
- * \return false for timeout, true for data
- */
-static bool wait_available(
-    boost::asio::ip::udp::socket &socket, double timeout
-){
-    #if defined(UHD_PLATFORM_LINUX) || defined(UHD_PLATFORM_WIN32)
-
-    //setup timeval for timeout
-    timeval tv;
-    tv.tv_sec = 0;
-    tv.tv_usec = long(timeout*1e6);
-
-    //setup rset for timeout
-    fd_set rset;
-    FD_ZERO(&rset);
-    FD_SET(socket.native(), &rset);
-
-    return ::select(socket.native()+1, &rset, NULL, NULL, &tv) > 0;
-
-    #else /*defined(UHD_PLATFORM_LINUX) || defined(UHD_PLATFORM_WIN32)*/
-
-    //FIXME: why does select fail on macintosh?
-    for (size_t i = 0; i < size_t(timeout*1e3); i++){
-        if (socket.available()) return true;
-        boost::this_thread::sleep(boost::posix_time::milliseconds(1));
-    }
-    return false;
-
-    #endif /*defined(UHD_PLATFORM_LINUX) || defined(UHD_PLATFORM_WIN32)*/
-}
-
-/***********************************************************************
- * UDP connected implementation class
- **********************************************************************/
-class udp_connected_impl : public udp_simple{
+class udp_simple_impl : public udp_simple{
 public:
-    //structors
-    udp_connected_impl(const std::string &addr, const std::string &port);
-    ~udp_connected_impl(void);
-
-    //send/recv
-    size_t send(const boost::asio::const_buffer &);
-    size_t recv(const boost::asio::mutable_buffer &, double);
-
-private:
-    boost::asio::ip::udp::socket   *_socket;
-    boost::asio::io_service        _io_service;
-};
+    udp_simple_impl(
+        const std::string &addr, const std::string &port, bool bcast, bool connect
+    ):_connected(connect){
+        //std::cout << boost::format("Creating udp transport for %s %s") % addr % port << std::endl;
 
-udp_connected_impl::udp_connected_impl(const std::string &addr, const std::string &port){
-    //std::cout << boost::format("Creating udp transport for %s %s") % addr % port << std::endl;
+        //resolve the address
+        asio::ip::udp::resolver resolver(_io_service);
+        asio::ip::udp::resolver::query query(asio::ip::udp::v4(), addr, port);
+        _receiver_endpoint = *resolver.resolve(query);
 
-    // resolve the address
-    boost::asio::ip::udp::resolver resolver(_io_service);
-    boost::asio::ip::udp::resolver::query query(boost::asio::ip::udp::v4(), addr, port);
-    boost::asio::ip::udp::endpoint receiver_endpoint = *resolver.resolve(query);
+        //create and open the socket
+        _socket = socket_sptr(new asio::ip::udp::socket(_io_service));
+        _socket->open(asio::ip::udp::v4());
 
-    // Create, open, and connect the socket
-    _socket = new boost::asio::ip::udp::socket(_io_service);
-    _socket->open(boost::asio::ip::udp::v4());
-    _socket->connect(receiver_endpoint);
-}
+        //allow broadcasting
+        _socket->set_option(asio::socket_base::broadcast(bcast));
 
-udp_connected_impl::~udp_connected_impl(void){
-    delete _socket;
-}
-
-size_t udp_connected_impl::send(const boost::asio::const_buffer &buff){
-    return _socket->send(boost::asio::buffer(buff));
-}
+        //connect the socket
+        if (connect) _socket->connect(_receiver_endpoint);
 
-size_t udp_connected_impl::recv(const boost::asio::mutable_buffer &buff, double timeout){
-    if (not wait_available(*_socket, timeout)) return 0;
-    return _socket->receive(boost::asio::buffer(buff));
-}
+    }
 
-/***********************************************************************
- * UDP broadcast implementation class
- **********************************************************************/
-class udp_broadcast_impl : public udp_simple{
-public:
-    //structors
-    udp_broadcast_impl(const std::string &addr, const std::string &port);
-    ~udp_broadcast_impl(void);
+    size_t send(const asio::const_buffer &buff){
+        if (_connected) return _socket->send(asio::buffer(buff));
+        return _socket->send_to(asio::buffer(buff), _receiver_endpoint);
+    }
 
-    //send/recv
-    size_t send(const boost::asio::const_buffer &);
-    size_t recv(const boost::asio::mutable_buffer &, double);
+    size_t recv(const asio::mutable_buffer &buff, double timeout){
+        if (not wait_for_recv_ready(_socket->native(), timeout)) return 0;
+        return _socket->receive(asio::buffer(buff));
+    }
 
 private:
-    boost::asio::ip::udp::socket   *_socket;
-    boost::asio::ip::udp::endpoint _receiver_endpoint;
-    boost::asio::io_service        _io_service;
+    bool                    _connected;
+    asio::io_service        _io_service;
+    socket_sptr             _socket;
+    asio::ip::udp::endpoint _receiver_endpoint;
 };
 
-udp_broadcast_impl::udp_broadcast_impl(const std::string &addr, const std::string &port){
-    //std::cout << boost::format("Creating udp transport for %s %s") % addr % port << std::endl;
-
-    // resolve the address
-    boost::asio::ip::udp::resolver resolver(_io_service);
-    boost::asio::ip::udp::resolver::query query(boost::asio::ip::udp::v4(), addr, port);
-    _receiver_endpoint = *resolver.resolve(query);
-
-    // Create and open the socket
-    _socket = new boost::asio::ip::udp::socket(_io_service);
-    _socket->open(boost::asio::ip::udp::v4());
-
-    // Allow broadcasting
-    boost::asio::socket_base::broadcast option(true);
-    _socket->set_option(option);
-
-}
-
-udp_broadcast_impl::~udp_broadcast_impl(void){
-    delete _socket;
-}
-
-size_t udp_broadcast_impl::send(const boost::asio::const_buffer &buff){
-    return _socket->send_to(boost::asio::buffer(buff), _receiver_endpoint);
-}
-
-size_t udp_broadcast_impl::recv(const boost::asio::mutable_buffer &buff, double timeout){
-    if (not wait_available(*_socket, timeout)) return 0;
-    boost::asio::ip::udp::endpoint sender_endpoint;
-    return _socket->receive_from(boost::asio::buffer(buff), sender_endpoint);
-}
-
 /***********************************************************************
  * UDP public make functions
  **********************************************************************/
 udp_simple::sptr udp_simple::make_connected(
     const std::string &addr, const std::string &port
 ){
-    return sptr(new udp_connected_impl(addr, port));
+    return sptr(new udp_simple_impl(addr, port, false, true /* no bcast, connect */));
 }
 
 udp_simple::sptr udp_simple::make_broadcast(
     const std::string &addr, const std::string &port
 ){
-    return sptr(new udp_broadcast_impl(addr, port));
+    return sptr(new udp_simple_impl(addr, port, true, false /* bcast, no connect */));
 }
diff --git a/host/lib/transport/udp_zero_copy_asio.cpp b/host/lib/transport/udp_zero_copy.cpp
index 05352ffce..dda3bb547 100644
--- a/host/lib/transport/udp_zero_copy_asio.cpp
+++ b/host/lib/transport/udp_zero_copy.cpp
@@ -15,13 +15,12 @@
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 //
 
+#include "udp_common.hpp"
 #include <uhd/transport/udp_zero_copy.hpp>
 #include <uhd/transport/udp_simple.hpp> //mtu
 #include <uhd/transport/bounded_buffer.hpp>
 #include <uhd/transport/buffer_pool.hpp>
-#include <uhd/utils/assert.hpp>
 #include <uhd/utils/warning.hpp>
-#include <boost/asio.hpp>
 #include <boost/format.hpp>
 #include <iostream>
 #include <list>
@@ -140,7 +139,7 @@ public:
         asio::ip::udp::endpoint receiver_endpoint = *resolver.resolve(query);
 
         //create, open, and connect the socket
-        _socket = new asio::ip::udp::socket(_io_service);
+        _socket = socket_sptr(new asio::ip::udp::socket(_io_service));
         _socket->open(asio::ip::udp::v4());
         _socket->connect(receiver_endpoint);
         _sock_fd = _socket->native();
@@ -162,10 +161,6 @@ public:
         }
     }
 
-    ~udp_zero_copy_asio_impl(void){
-        delete _socket;
-    }
-
     //get size for internal socket buffer
     template <typename Opt> size_t get_buff_size(void) const{
         Opt option;
@@ -183,30 +178,24 @@ public:
     /*******************************************************************
      * Receive implementation:
      *
-     * Use select to perform a blocking receive with timeout.
+     * Perform a non-blocking receive for performance,
+     * and then fall back to a blocking receive with timeout.
      * Return the managed receive buffer with the new length.
      * When the caller is finished with the managed buffer,
      * the managed receive buffer is released back into the queue.
      ******************************************************************/
-    UHD_INLINE bool is_recv_ready(double timeout){
-        //setup timeval for timeout
-        timeval tv;
-        tv.tv_sec = 0;
-        tv.tv_usec = long(timeout*1e6);
-
-        //setup rset for timeout
-        fd_set rset;
-        FD_ZERO(&rset);
-        FD_SET(_sock_fd, &rset);
-
-        //call select with timeout on receive socket
-        return ::select(_sock_fd+1, &rset, NULL, NULL, &tv) > 0;
-    }
-
     managed_recv_buffer::sptr get_recv_buff(double timeout){
         udp_zero_copy_asio_mrb *mrb = NULL;
-        if (is_recv_ready(timeout) and _pending_recv_buffs.pop_with_timed_wait(mrb, timeout)){
-            return mrb->get_new(::recv(_sock_fd, mrb->cast<char *>(), _recv_frame_size, 0));
+        if (_pending_recv_buffs.pop_with_timed_wait(mrb, timeout)){
+
+            #ifdef MSG_DONTWAIT //try a non-blocking recv() if supported
+            ssize_t ret = ::recv(_sock_fd, mrb->cast<char *>(), _recv_frame_size, MSG_DONTWAIT);
+            if (ret > 0) return mrb->get_new(ret);
+            #endif
+
+            if (wait_for_recv_ready(_sock_fd, timeout)) return mrb->get_new(
+                ::recv(_sock_fd, mrb->cast<char *>(), _recv_frame_size, 0)
+            );
         }
         return managed_recv_buffer::sptr();
     }
@@ -262,7 +251,7 @@ private:
 
     //asio guts -> socket and service
     asio::io_service        _io_service;
-    asio::ip::udp::socket   *_socket;
+    socket_sptr             _socket;
     int                     _sock_fd;
 };
 
diff --git a/host/lib/utils/CMakeLists.txt b/host/lib/utils/CMakeLists.txt
index 743528189..a4d3b2db2 100644
--- a/host/lib/utils/CMakeLists.txt
+++ b/host/lib/utils/CMakeLists.txt
@@ -24,8 +24,8 @@
 ########################################################################
 MESSAGE(STATUS "")
 MESSAGE(STATUS "Configuring priority scheduling...")
-
 INCLUDE(CheckCXXSourceCompiles)
+
 CHECK_CXX_SOURCE_COMPILES("
     #include <pthread.h>
     int main(){
@@ -52,9 +52,10 @@ IF(HAVE_PTHREAD_SETSCHEDPARAM)
 ELSEIF(HAVE_WIN_SETTHREADPRIORITY)
     MESSAGE(STATUS "  Priority scheduling supported through windows SetThreadPriority.")
     SET(THREAD_PRIO_DEFS HAVE_WIN_SETTHREADPRIORITY)
-ELSE(HAVE_PTHREAD_SETSCHEDPARAM)
+ELSE()
     MESSAGE(STATUS "  Priority scheduling not supported.")
-ENDIF(HAVE_PTHREAD_SETSCHEDPARAM)
+    SET(THREAD_PRIO_DEFS HAVE_THREAD_PRIO_DUMMY)
+ENDIF()
 
 SET_SOURCE_FILES_PROPERTIES(
     ${CMAKE_CURRENT_SOURCE_DIR}/thread_priority.cpp
@@ -66,21 +67,39 @@ SET_SOURCE_FILES_PROPERTIES(
 ########################################################################
 MESSAGE(STATUS "")
 MESSAGE(STATUS "Configuring module loading...")
+INCLUDE(CheckCXXSourceCompiles)
 
-INCLUDE(CheckIncludeFileCXX)
-CHECK_INCLUDE_FILE_CXX(dlfcn.h HAVE_DLFCN_H)
-CHECK_INCLUDE_FILE_CXX(windows.h HAVE_WINDOWS_H)
+SET(CMAKE_REQUIRED_LIBRARIES ${CMAKE_DL_LIBS})
+CHECK_CXX_SOURCE_COMPILES("
+    #include <dlfcn.h>
+    int main(){
+        dlopen(0, 0);
+        return 0;
+    }
+    " HAVE_DLOPEN
+)
+UNSET(CMAKE_REQUIRED_LIBRARIES)
+
+CHECK_CXX_SOURCE_COMPILES("
+    #include <windows.h>
+    int main(){
+        LoadLibrary(0);
+        return 0;
+    }
+    " HAVE_LOAD_LIBRARY
+)
 
-IF(HAVE_DLFCN_H)
+IF(HAVE_DLOPEN)
     MESSAGE(STATUS "  Module loading supported through dlopen.")
-    SET(LOAD_MODULES_DEFS HAVE_DLFCN_H)
+    SET(LOAD_MODULES_DEFS HAVE_DLOPEN)
     LIBUHD_APPEND_LIBS(${CMAKE_DL_LIBS})
-ELSEIF(HAVE_WINDOWS_H)
+ELSEIF(HAVE_LOAD_LIBRARY)
     MESSAGE(STATUS "  Module loading supported through LoadLibrary.")
-    SET(LOAD_MODULES_DEFS HAVE_WINDOWS_H)
-ELSE(HAVE_DLFCN_H)
+    SET(LOAD_MODULES_DEFS HAVE_LOAD_LIBRARY)
+ELSE()
     MESSAGE(STATUS "  Module loading not supported.")
-ENDIF(HAVE_DLFCN_H)
+    SET(LOAD_MODULES_DEFS HAVE_LOAD_MODULES_DUMMY)
+ENDIF()
 
 SET_SOURCE_FILES_PROPERTIES(
     ${CMAKE_CURRENT_SOURCE_DIR}/load_modules.cpp
diff --git a/host/lib/utils/load_modules.cpp b/host/lib/utils/load_modules.cpp
index 623d31eb6..fa9b22438 100644
--- a/host/lib/utils/load_modules.cpp
+++ b/host/lib/utils/load_modules.cpp
@@ -29,9 +29,8 @@ namespace fs = boost::filesystem;
 /***********************************************************************
  * Module Load Function
  **********************************************************************/
-#if defined(HAVE_DLFCN_H)
+#ifdef HAVE_DLOPEN
 #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(
@@ -39,10 +38,11 @@ static void load_module(const std::string &file_name){
         ));
     }
 }
+#endif /* HAVE_DLOPEN */
 
-#elif defined(HAVE_WINDOWS_H)
-#include <windows.h>
 
+#ifdef HAVE_LOAD_LIBRARY
+#include <windows.h>
 static void load_module(const std::string &file_name){
     if (LoadLibrary(file_name.c_str()) == NULL){
         throw std::runtime_error(str(
@@ -50,16 +50,16 @@ static void load_module(const std::string &file_name){
         ));
     }
 }
+#endif /* HAVE_LOAD_LIBRARY */
 
-#else
 
+#ifdef HAVE_LOAD_MODULES_DUMMY
 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
+#endif /* HAVE_LOAD_MODULES_DUMMY */
 
 /***********************************************************************
  * Load Modules
diff --git a/host/lib/utils/thread_priority.cpp b/host/lib/utils/thread_priority.cpp
index 40b74f655..18f372ec0 100644
--- a/host/lib/utils/thread_priority.cpp
+++ b/host/lib/utils/thread_priority.cpp
@@ -44,7 +44,7 @@ static void check_priority_range(float priority){
 /***********************************************************************
  * Pthread API to set priority
  **********************************************************************/
-#if defined(HAVE_PTHREAD_SETSCHEDPARAM)
+#ifdef HAVE_PTHREAD_SETSCHEDPARAM
     #include <pthread.h>
 
     void uhd::set_thread_priority(float priority, bool realtime){
@@ -67,11 +67,12 @@ static void check_priority_range(float priority){
         int ret = pthread_setschedparam(pthread_self(), policy, &sp);
         if (ret != 0) throw std::runtime_error("error in pthread_setschedparam");
     }
+#endif /* HAVE_PTHREAD_SETSCHEDPARAM */
 
 /***********************************************************************
  * Windows API to set priority
  **********************************************************************/
-#elif defined(HAVE_WIN_SETTHREADPRIORITY)
+#ifdef HAVE_WIN_SETTHREADPRIORITY
     #include <windows.h>
 
     void uhd::set_thread_priority(float priority, bool realtime){
@@ -93,13 +94,14 @@ static void check_priority_range(float priority){
         if (SetThreadPriority(GetCurrentThread(), priorities[pri_index]) == 0)
             throw std::runtime_error("error in SetThreadPriority");
     }
+#endif /* HAVE_WIN_SETTHREADPRIORITY */
 
 /***********************************************************************
  * Unimplemented API to set priority
  **********************************************************************/
-#else
+#ifdef HAVE_LOAD_MODULES_DUMMY
     void uhd::set_thread_priority(float, bool){
         throw std::runtime_error("set thread priority not implemented");
     }
 
-#endif /* HAVE_PTHREAD_SETSCHEDPARAM */
+#endif /* HAVE_LOAD_MODULES_DUMMY */