Switch to side-by-side view

--- a/src/utils/log.cpp
+++ b/src/utils/log.cpp
@@ -31,7 +31,7 @@
 bool Logger::reopen(const std::string& fn)
 {
 #if LOGGER_THREADSAFE
-    std::unique_lock<std::mutex> lock(m_mutex);
+    std::unique_lock<std::recursive_mutex> lock(m_mutex);
 #endif
     if (!fn.empty()) {
         m_fn = fn;