getCommandResult():

reset result if necessary (for instance for showing current result
	in GUI.

UpdatePTUDevCtrl/process/command.h

@@ -7,22 +7,24 @@
 #include <QString>
 #include <QStringList>
 #include <QProcess>
+#include <QMutex>
 
 
 class Command : public QObject {
     Q_OBJECT
 
     QString m_command;
-    QString m_commandResult;
+    mutable QString m_commandResult;
     int m_waitForStartTimeout;
     int m_waitForFinishTimeout;
     int m_exitCode;
+    mutable QMutex m_mtx;
 public:
     explicit Command(QString const &command,
                      int start_timeout = 100000,
                      int finish_timeout = 100000);
 
-    QString getCommandResult() const;
+    QString getCommandResult(bool reset = false) const;
     QString command() const { return m_command; }
 
     bool execute(QString workingDirectory, QStringList args = QStringList());