Hello,
I am using Qt4 libraries in V3.5.4 KDevelop and I am having a general debugging issue.

I have a QFile instance in a subclassed QThread, and have noticed that whenever I try to debug step over a QFile method, the debugger completely freezes. I have tried stepping over said function calls and even stepping into said function calls, and the debugger freezes.

Below is how I am using my code.

Qt Code: 
  1. class MyQThread : public QThread 
  2. {
  3. ...
  4.  
  5. private:
  6.     QFile * file;
  7. };
  8.  
  9.  
  10. MyQThread::MyQThread(QObject * parent) : QThread(parent)
  11. {
  12.     file = NULL;
  13. }
  14.  
  15. void MyQThread::run()
  16. {
  17.    bool doneReading;
  18.     while (running) {
  19.        /* get file if null */
  20.       if (!file) {
  21.           QString path = getPathToFile();
  22.           file = new QFile(path);
  23.           if (!file->open(QIODevice::ReadOnly)) {    /* !! FREEZES HERE  !! */
  24.              delete file; /* never enters here */
  25.              file = NULL;
  26.              return;
  27.           }
  28.       }
  29.  
  30.       /* never gets to here */
  31.       doneReading = readSomeFileData(file);
  32.  
  33.       if (doneReading) {
  34.            file->close();
  35.            delete file;
  36.            file = NULL;
  37.        }
  38.     }
  39. }
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I am pretty sure there are no open file desciptors on the files I am attempting to open b/c I have tested this code after rebooting the machine and manipulating the files in no way. Also, I have verified that I am getting the correct path.

Are there any funny quirks about using QFile in a QThread and not the main GUI thread?

Thanks in advance.