Added mutex for critical regions in the decode process

Detector.cpp

@@ -43,6 +43,8 @@ bool Detector::reset ()
 
 void Detector::clear ()
 {
+  QMutexLocker mutex(&m_lock);
+
 #if JS8_RING_BUFFER
   // set index to roughly where we are in time (1ms resolution)
   qint64 now (DriftingDateTime::currentMSecsSinceEpoch ());
@@ -64,6 +66,8 @@ void Detector::clear ()
 
 qint64 Detector::writeData (char const * data, qint64 maxSize)
 {
+  QMutexLocker mutex(&m_lock);
+
   int ns=secondInPeriod();
   if(ns < m_ns) {                      // When ns has wrapped around to zero, restart the buffers
     dec_data.params.kin = 0;

Detector.hpp

@@ -2,6 +2,8 @@
 #define DETECTOR_HPP__
 #include "AudioDevice.hpp"
 #include <QScopedArrayPointer>
+#include <QMutex>
+#include <QMutexLocker>
 
 //
 // output device that distributes data in predefined chunks via a signal
@@ -24,6 +26,7 @@ public:
   //
   Detector (unsigned frameRate, unsigned periodLengthInSeconds, unsigned downSampleFactor = 4u, QObject * parent = 0);
 
+  QMutex * getMutex(){ return &m_lock; }
   unsigned period() const {return m_period;}
   void setTRPeriod(unsigned p) {m_period=p;}
   bool reset () override;
@@ -55,6 +58,7 @@ private:
   // data (a signals worth) at
   // the input sample rate
   unsigned m_bufferPos;
+  QMutex m_lock;
 };
 
 #endif

mainwindow.cpp

@@ -1496,8 +1496,8 @@ MainWindow::MainWindow(QDir const& temp_directory, bool multiple,
   // Don't block heartbeat's first run...
   m_lastTxStartTime = DriftingDateTime::currentDateTimeUtc().addSecs(-300);
 
-  // But do block the decoder's first run until the next transmit period
+  // But do block the decoder's first run until 50% through next transmit period
-  m_lastTxStopTime = nextTransmitCycle();
+  m_lastTxStopTime = nextTransmitCycle().addSecs(-m_TRperiod/2);
 
   int width = 75;
   /*
@@ -2687,7 +2687,7 @@ void MainWindow::dataSink(qint64 frames)
 
     m_dateTime = DriftingDateTime::currentDateTimeUtc().toString ("yyyy-MMM-dd hh:mm");
 
-    decode();
+    decode(k);
 }
 
 QString MainWindow::save_wave_file (QString const& name, short const * data, int seconds,
@@ -3801,6 +3801,7 @@ void MainWindow::read_wav_file (QString const& fname)
   m_nutc0=m_UTCdisk;
   m_UTCdisk=fname.mid(i0+1,i1-i0-1).toInt();
   m_wav_future_watcher.setFuture (QtConcurrent::run ([this, fname] {
+      QMutexLocker lock(m_detector->getMutex());
       auto basename = fname.mid (fname.lastIndexOf ('/') + 1);
       auto pos = fname.indexOf (".wav", 0, Qt::CaseInsensitive);
       // global variables and threads do not mix well, this needs changing
@@ -3841,7 +3842,6 @@ void MainWindow::read_wav_file (QString const& fname)
       if(basename.mid(0,10)=="000000_000" && m_mode == "FT8") {
         dec_data.params.nutc=15*basename.mid(10,3).toInt();
       }
-
     }));
 }
 
@@ -3880,9 +3880,14 @@ void MainWindow::on_actionDecode_remaining_files_in_directory_triggered()
   on_actionOpen_next_in_directory_triggered();
 }
 
-void MainWindow::diskDat()                                   //diskDat()
+void MainWindow::diskDat(){
-{
+    QMutexLocker mutex(m_detector->getMutex());
-  if(dec_data.params.kin>0) {
+
+    if(dec_data.params.kin<=0) {
+        MessageBox::information_message(this, tr("No data read from disk. Wrong file format?"));
+        return;
+    }
+
     int k;
     int kstep=m_FFTSize;
     m_diskData=true;
@@ -3897,9 +3902,6 @@ void MainWindow::diskDat()                                   //diskDat()
         dataSink(k);
         qApp->processEvents();                                //Update the waterfall
     }
-  } else {
-    MessageBox::information_message(this, tr("No data read from disk. Wrong file format?"));
-  }
 }
 
 //Delete ../save/*.wav
@@ -4036,9 +4038,8 @@ bool MainWindow::isDecodeReady(int submode, qint32 k, qint32 k0, qint32 *pCurren
  *        try decoding
  * @return true if the decoder was activated, false otherwise
  */
-bool MainWindow::decode(){
+bool MainWindow::decode(qint32 k){
     static int k0 = 9999999;
-    int k = dec_data.params.kin;
     int kZero = k0;
     k0 = k;
 
@@ -4407,6 +4408,9 @@ bool MainWindow::decodeProcessQueue(qint32 *pSubmode){
  *        remove the lock file to start the decoding process
  */
 void MainWindow::decodeStart(){    
+    // critical section
+    QMutexLocker mutex(m_detector->getMutex());
+
     if(m_decoderBusy){
         if(JS8_DEBUG_DECODE) qDebug() << "--> decoder cannot start...busy (busy flag)";
         return;
@@ -6466,7 +6470,7 @@ bool MainWindow::isMessageQueuedForTransmit(){
 }
 
 bool MainWindow::isInDecodeDelayThreshold(int ms){
-    if(m_lastTxStopTime.isNull()){
+    if(!m_lastTxStopTime.isValid() || m_lastTxStopTime.isNull()){
         return false;
     }
 

mainwindow.h

@@ -230,7 +230,7 @@ private slots:
   void on_actionSpecial_mouse_commands_triggered();
   void on_actionSolve_FreqCal_triggered();
   void on_actionCopyright_Notice_triggered();
-  bool decode();
+  bool decode(qint32 k);
   bool isDecodeReady(int submode, qint32 k, qint32 k0, qint32 *pCurrentDecodeStart, qint32 *pNextDecodeStart, qint32 *pStart, qint32 *pSz, qint32 *pCycle);
   bool decodeEnqueueReady(qint32 k, qint32 k0);
   bool decodeProcessQueue(qint32 *pSubmode);