Bug 518750

There is no qt4 package in Fedora anymore, reassigning to qt.

Source code of the test program:

$ svn cat -r10854 svn://svn.valgrind.org/valgrind/trunk/drd/tests/qt4_mutex.cpp                                           
/// Qt4 mutex test.                                                            

#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif             

#include "config.h"
#include <QMutex>         // class QMutex
#include <QThread>        // class QThread
#include <cassert>                        
#include <cstdio>         // fprintf()    
#include <cstdlib>        // atoi()       
#include <new>                            
#include <pthread.h>      // pthread_barrier_t
#include <vector>                             


static pthread_barrier_t s_barrier;
static QMutex* s_pMutex;           
static int s_iterations;           
static int s_counter;              


class IncThread: public QThread
{                              
  virtual void run();          
};                             

void IncThread::run()
{                    
  int i;             

  pthread_barrier_wait(&s_barrier);
  for (i = s_iterations; i > 0; i--)
  {                                 
    s_pMutex->lock();               
    s_counter++;                    
    s_pMutex->unlock();             
  }                                 
}                                   

int main(int argc, char** argv)
{                              
  int i;                       
  const int n_threads = 10;    
  std::vector<QThread*> tid(n_threads);

  s_iterations = argc > 1 ? atoi(argv[1]) : 1000;

  fprintf(stderr, "Start of test.\n");

  {
    // Stack-allocated mutex.
    QMutex M(QMutex::Recursive);
    M.lock();                   
    assert(M.tryLock());        
    M.unlock();                 
    M.unlock();                 
  }                             
#if defined(HAVE_QTCORE_QMUTEX_TRYLOCK_INT)
  {                                        
    QMutex M(QMutex::NonRecursive);        
    assert(M.tryLock(1));                  
    assert(! M.tryLock(1));                
    M.unlock();                            
  }                                        
#endif

  pthread_barrier_init(&s_barrier, 0, n_threads);
  s_pMutex = new QMutex();
  for (i = 0; i < n_threads; i++)
  {
    tid[i] = new IncThread;
    tid[i]->start();
  }
  for (i = 0; i < n_threads; i++)
  {
    tid[i]->wait();
    delete tid[i];
  }
  delete s_pMutex;
  s_pMutex = 0;
  pthread_barrier_destroy(&s_barrier);

  if (s_counter == n_threads * s_iterations)
    fprintf(stderr, "Test successful.\n");
  else
    fprintf(stderr, "Test failed: counter = %d, should be %d\n",
            s_counter, n_threads * s_iterations);

  return 0;
}

I'd suggest upstreaming this to nokia , esp since there's a test-case.

(after confirming it's still a problem with qt-4.6.x).

A related upstream bug report can be found here: http://bugreports.qt.nokia.com/browse/QTBUG-5655. This bug report has already been acknowledged by Nokia.

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lifetime, sometimes those efforts are overtaken by events.  Often a 
more recent Fedora release includes newer upstream software that fixes 
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