Pausing a thread while waiting that phonon play a sound file

[franco.amato]

Hi to all,
In my application I play a sound file when a particular situation occours ( a user is recognized with a biometric system ).
The code is basically executed in a timer event so:

void MyClass::onTimer()
{
   timer->stop();
   //..code..
   currentFrame = GetCameraFrame();
   if( userIsRecognized(frame) )
     {
        emit sig_userRecognized();
     }
   turnOffTheCamera();
   //.. more code..
   timer->start(5);
}

void MyClass::onTimer()
{
   timer->stop();
   //..code..
   currentFrame = GetCameraFrame();
   if( userIsRecognized(frame) )
     {
        emit sig_userRecognized();
     }
   turnOffTheCamera();
   //.. more code..
   timer->start(5);
}

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in the slot connected to the sig_userRecognized() signal basically I do something and I play a file using phonon so:

void MyClass::onUserRecognized()
{
  //some code
  mediaObject->setCurrentSource( Phonon::MediaSource("./sounds/file.wav") );
  mediaObject->play();
  //more code
}

void MyClass::onUserRecognized()
{
  //some code
  mediaObject->setCurrentSource( Phonon::MediaSource("./sounds/file.wav") );
  mediaObject->play();
  //more code
}

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What I would do is pause the onTimer routine 'till the file has finished to play but I don't know how because seems that's played in a separated thread.
Regards