fix: Fixed racing-condition when switching to another TTY _and_ disconnecting

the audio device at the same time

Author: timschneeb

src/utils/Log.cpp

@@ -120,6 +120,8 @@ void Log::write(const QString& msg, bool force, bool useStdErr, LoggingMode mode
     if(mode == LM_UNSPECIFIED)
         mode = loggingMode;
 
+    mutex.lock();
+
     QFile file(path());
     if (mode == LM_ALL || mode == LM_FILE)
     {
@@ -136,6 +138,8 @@ void Log::write(const QString& msg, bool force, bool useStdErr, LoggingMode mode
         (useStdErr ? err : out) << msg.toUtf8().constData() << Qt::endl;
         (useStdErr ? err : out).flush();
     }
+
+    mutex.unlock();
 }
 
 QString Log::prepareDebugMessage(const QString& message, util::source_location location)

src/utils/Log.h

@@ -18,6 +18,7 @@
 #include <string>
 #include <QString>
 #include <QTextStream>
+#include <QMutex>
 
 // TODO Move Utils.h out of AudioDrivers/Base into a common subproject
 #include "Utils.h"
@@ -101,6 +102,7 @@ class Log
     LoggingMode loggingMode = LM_ALL;
     bool useSimpleFormat = false;
     Severity minSeverity = Debug;
+    QMutex mutex = QMutex();
 };
 
 #endif // LOG_H