utils: make UHD_MSG thread-safe,

Now, only 1 thread can print at a time.

1 files changed, 2 insertions, 0 deletions

diff --git a/host/lib/utils/msg.cpp b/host/lib/utils/msg.cpp
index de98ada64..95879a116 100644
--- a/host/lib/utils/msg.cpp
+++ b/host/lib/utils/msg.cpp
@@ -79,6 +79,8 @@ void uhd::msg::register_handler(const handler_t &handler){
 }
 
 static void 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){
     case uhd::msg::fastpath:
         std::cerr << msg << std::flush;