3 files changed, 66 insertions, 2 deletions

diff --git a/host/include/uhd/utils/msg.hpp b/host/include/uhd/utils/msg.hpp
index 2cc5893e7..48ffb28a1 100644
--- a/host/include/uhd/utils/msg.hpp
+++ b/host/include/uhd/utils/msg.hpp
@@ -57,6 +57,13 @@ namespace uhd{ namespace msg{
     typedef void (*handler_t)(type_t, const std::string &);
 
     /*!
+     * Default message handler for printing uhd system messages
+     * \param type message type, such as status, warning, or error
+     * \param msg contents of the system message as a string
+     */
+    void default_msg_handler(type_t type, const std::string &msg);
+
+    /*!
      * Register the handler for uhd system messages.
      * Only one handler can be registered at once.
      * This replaces the default std::cout/cerr handler.
@@ -64,6 +71,12 @@ namespace uhd{ namespace msg{
      */
     UHD_API void register_handler(const handler_t &handler);
 
+    /*!
+     * Returns the current message handler for uhd system messages
+     * \returns the current message handler
+     */
+    UHD_API const handler_t& get_handler();
+
     //! Internal message object (called by UHD_MSG macro)
     class UHD_API _msg{
     public:
diff --git a/host/lib/usrp/x300/x300_impl.cpp b/host/lib/usrp/x300/x300_impl.cpp
index 313e070b3..8164c79b6 100644
--- a/host/lib/usrp/x300/x300_impl.cpp
+++ b/host/lib/usrp/x300/x300_impl.cpp
@@ -381,6 +381,32 @@ static void x300_load_fw(wb_iface::sptr fw_reg_ctrl, const std::string &file_nam
     UHD_MSG(status) << " done!" << std::endl;
 }
 
+static const std::string thread_final_msg = "Finished multi-threaded initialization\n";
+
+static void thread_msg_handler(uhd::msg::type_t type, const std::string &msg)
+{
+    static boost::mutex msg_mutex;
+    boost::mutex::scoped_lock lock(msg_mutex);
+
+    typedef std::pair<uhd::msg::type_t, std::string> msg_pair_t;
+    typedef std::map<boost::thread::id, std::vector<msg_pair_t> > thread_map_t;
+
+    static thread_map_t thread_list;
+    thread_list[boost::this_thread::get_id()].push_back(msg_pair_t(type, msg));
+
+    if (msg == thread_final_msg)
+    {
+        BOOST_FOREACH(const thread_map_t::value_type &thread_pair, thread_list)
+        {
+            BOOST_FOREACH(const msg_pair_t &msg_pair, thread_pair.second)
+            {
+                // Forward the message to the default handler
+                uhd::msg::default_msg_handler(msg_pair.first, msg_pair.second);
+            }
+        }
+    }
+}
+
 x300_impl::x300_impl(const uhd::device_addr_t &dev_addr)
     : device3_impl()
     , _sid_framer(0)
@@ -392,6 +418,7 @@ x300_impl::x300_impl(const uhd::device_addr_t &dev_addr)
     const device_addrs_t device_args = separate_device_addr(dev_addr);
     _mb.resize(device_args.size());
 
+    // Serialize the initialization process
     if (dev_addr.has_key("serialize_init") or device_args.size() == 1) {
         for (size_t i = 0; i < device_args.size(); i++)
         {
@@ -400,6 +427,11 @@ x300_impl::x300_impl(const uhd::device_addr_t &dev_addr)
         return;
     }
 
+    // Setup a custom messenger handler
+    uhd::msg::handler_t current_handler = uhd::msg::get_handler();
+    uhd::msg::register_handler(&thread_msg_handler);
+
+    // Thread the initialization process
     boost::thread_group setup_threads;
     for (size_t i = 0; i < device_args.size(); i++)
     {
@@ -408,6 +440,10 @@ x300_impl::x300_impl(const uhd::device_addr_t &dev_addr)
         );
     }
     setup_threads.join_all();
+
+    // restore the original message handler
+    UHD_MSG(status) << thread_final_msg;
+    uhd::msg::register_handler(current_handler);
 }
 
 void x300_impl::mboard_members_t::discover_eth(
@@ -518,6 +554,16 @@ void x300_impl::setup_mb(const size_t mb_i, const uhd::device_addr_t &dev_addr)
     mboard_members_t &mb = _mb[mb_i];
     mb.initialization_done = false;
 
+    const std::string thread_id(
+        boost::lexical_cast<std::string>(boost::this_thread::get_id())
+    );
+    const std::string thread_msg(
+        "Thread ID " + thread_id + " for motherboard "
+        + boost::lexical_cast<std::string>(mb_i)
+    );
+    UHD_MSG(status) << std::endl;
+    UHD_MSG(status) << thread_msg << std::endl;
+
     std::vector<std::string> eth_addrs;
     // Not choosing eth0 based on resource might cause user issues
     std::string eth0_addr = dev_addr.has_key("resource") ? dev_addr["resource"] : dev_addr["addr"];
diff --git a/host/lib/utils/msg.cpp b/host/lib/utils/msg.cpp
index 95879a116..d9d2fb66a 100644
--- a/host/lib/utils/msg.cpp
+++ b/host/lib/utils/msg.cpp
@@ -78,7 +78,12 @@ void uhd::msg::register_handler(const handler_t &handler){
     msg_rs().handler = handler;
 }
 
-static void default_msg_handler(uhd::msg::type_t type, const std::string &msg){
+const uhd::msg::handler_t& uhd::msg::get_handler(){
+    boost::mutex::scoped_lock lock(msg_rs().mutex);
+    return msg_rs().handler;
+}
+
+void uhd::msg::default_msg_handler(uhd::msg::type_t type, const std::string &msg){
     static boost::mutex msg_mutex;
     boost::mutex::scoped_lock lock(msg_mutex);
     switch(type){
@@ -104,7 +109,7 @@ static void default_msg_handler(uhd::msg::type_t type, const std::string &msg){
 }
 
 UHD_STATIC_BLOCK(msg_register_default_handler){
-    uhd::msg::register_handler(&default_msg_handler);
+    uhd::msg::register_handler(&uhd::msg::default_msg_handler);
 }
 
 /***********************************************************************