emphasize locked block

Base/Progress/ProgressHandler.cpp

@@ -31,15 +31,17 @@ void ProgressHandler::subscribe(Callback_t inform)
 void ProgressHandler::incrementDone(size_t ticks_done)
 {
     static std::mutex single_mutex;
-    std::unique_lock<std::mutex> single_lock(single_mutex);
+    {
+        std::unique_lock<std::mutex> _(single_mutex);
 
-    m_completed_nticks += ticks_done;
-    if (m_completed_nticks > m_expected_nticks)
-        m_expected_nticks = m_completed_nticks + 1;
+        m_completed_nticks += ticks_done;
+        if (m_completed_nticks > m_expected_nticks)
+            m_expected_nticks = m_completed_nticks + 1;
 
-    int percentage_done = (int)(100. * m_completed_nticks / m_expected_nticks);
-    // fractional part is discarded, which is fine here:
-    // the value 100 is only returned if everything is done
+        int percentage_done = (int)(100. * m_completed_nticks / m_expected_nticks);
+        // fractional part is discarded, which is fine here:
+        // the value 100 is only returned if everything is done
 
-    m_continuation_flag = (!m_inform || m_inform(percentage_done)) && m_continuation_flag;
+        m_continuation_flag = (!m_inform || m_inform(percentage_done)) && m_continuation_flag;
+    }
 }