From 1a258711b00cef322cadedf35540d64ae18eb0b0 Mon Sep 17 00:00:00 2001
From: "Matthias P. Braendli" <matthias.braendli@mpb.li>
Date: Sun, 28 Feb 2016 18:04:18 +0100
Subject: Guard log print to stderr with mutex

---
 src/Log.cpp | 5 ++++-
 src/Log.h   | 3 +++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/Log.cpp b/src/Log.cpp
index f8f7d7f..90548af 100644
--- a/src/Log.cpp
+++ b/src/Log.cpp
@@ -74,7 +74,10 @@ void Logger::logstr(log_level_t level, std::string message)
         (*it)->log(level, message);
     }
 
-    std::cerr << levels_as_str[level] << " " << message << std::endl;
+    {
+        std::lock_guard<std::mutex> guard(m_cerr_mutex);
+        std::cerr << levels_as_str[level] << " " << message << std::endl;
+    }
 }
 
 
diff --git a/src/Log.h b/src/Log.h
index 7be6df8..81490b2 100644
--- a/src/Log.h
+++ b/src/Log.h
@@ -39,6 +39,7 @@
 #include <stdexcept>
 #include <string>
 #include <map>
+#include <mutex>
 
 #define SYSLOG_IDENT "ODR-DabMux"
 #define SYSLOG_FACILITY LOG_LOCAL0
@@ -146,6 +147,8 @@ class Logger {
 
     private:
         std::list<LogBackend*> backends;
+
+        std::mutex m_cerr_mutex;
 };
 
 extern Logger etiLog;
-- 
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