Merge branch '4.7' of scm.dev.nokia.troll.no:qt/oslo-staging-1 into 4.7-integration

* '4.7' of scm.dev.nokia.troll.no:qt/oslo-staging-1: (46 commits)
  Build and run QElapsedTimer test.
  Fix license headers.
  Add flag to indicate that network sessions are expected on a platform.
  Don't fail unit test when there is no default network configuration.
  Make destructor virtual.
  Optimized QLocale to access system locale on demand.
  Remove unwanted code in f8d5f2594a9b268b9eeecf95b24b23fc940c71ce
  Compile fix on keypad-navigation systems
  Force qt-zlib to be used for host system when cross compiling.
  qmake: fix to create proper install target in Makefile at first run
  compile fix for Windows
  Fixed focus handling when Qt is embedded into Cocoa app.
  Do not beep on Mac when pressing some keys.
  Do not deliver the same key event multiple times in Cocoa.
  Implement Idle-priority threads for Linux.
  Improved qt_x11_wait_for_window_manager
  Doc: document QElapsedTimer
  Added missing "const" for mac.
  qdoc3: Fixed some ifdef typos and removed some whitespace.
  Manual test for QTBUG-8933.
  ...

69 files changed, 1810 insertions, 522 deletions

diff --git a/src/corelib/animation/qabstractanimation.cpp b/src/corelib/animation/qabstractanimation.cpp
index f834a80..82b3003 100644
--- a/src/corelib/animation/qabstractanimation.cpp
+++ b/src/corelib/animation/qabstractanimation.cpp
@@ -170,6 +170,7 @@ QUnifiedTimer::QUnifiedTimer() :
     currentAnimationIdx(0), consistentTiming(false), slowMode(false),
     isPauseTimerActive(false), runningLeafAnimations(0)
 {
+    time.invalidate();
 }
 
 QUnifiedTimer *QUnifiedTimer::instance()
diff --git a/src/corelib/animation/qabstractanimation_p.h b/src/corelib/animation/qabstractanimation_p.h
index 8bc3224..2282cdb 100644
--- a/src/corelib/animation/qabstractanimation_p.h
+++ b/src/corelib/animation/qabstractanimation_p.h
@@ -56,6 +56,7 @@
 #include <QtCore/qbasictimer.h>
 #include <QtCore/qdatetime.h>
 #include <QtCore/qtimer.h>
+#include <QtCore/qelapsedtimer.h>
 #include <private/qobject_p.h>
 
 #ifdef Q_OS_WIN
@@ -113,61 +114,7 @@ private:
     Q_DECLARE_PUBLIC(QAbstractAnimation)
 };
 
-class ElapsedTimer
-{
-public:
-    ElapsedTimer() {
-        invalidate();
-    }
-
-    void invalidate() {
-        m_started = -1;
-    }
-
-    bool isValid() const {
-        return m_started >= 0;
-    }
-
-    void start() {
-        m_started = getTickCount_sys();
-    }
-
-    qint64 elapsed() const {
-        qint64 current = getTickCount_sys();
-        qint64 delta = current - m_started;
-        if (delta < 0)
-            delta += getPeriod_sys();   //we wrapped around
-        return delta;
-    }
-
-private:
-    enum {
-        MSECS_PER_HOUR = 3600000,
-        MSECS_PER_MIN = 60000
-    };
-
-    qint64 m_started;
-
-    quint64 getPeriod_sys() const {
-#ifdef Q_OS_WIN
-        return Q_UINT64_C(0x100000000);
-#else
-        // fallback
-        return 86400 * 1000;
-#endif
-    }
-
-    qint64 getTickCount_sys() const {
-#ifdef Q_OS_WIN
-        return ::GetTickCount();
-#else
-        // fallback
-        const QTime t = QTime::currentTime();
-        return MSECS_PER_HOUR * t.hour() + MSECS_PER_MIN * t.minute() + 1000 * t.second() + t.msec();
-#endif
-    }
-};
-
+typedef QElapsedTimer ElapsedTimer;
 
 class QUnifiedTimer : public QObject
 {
diff --git a/src/corelib/io/qprocess.cpp b/src/corelib/io/qprocess.cpp
index 12a992a..63c2ab8 100644
--- a/src/corelib/io/qprocess.cpp
+++ b/src/corelib/io/qprocess.cpp
@@ -88,7 +88,7 @@ QT_END_NAMESPACE
 #include "qprocess_p.h"
 
 #include <qbytearray.h>
-#include <qdatetime.h>
+#include <qelapsedtimer.h>
 #include <qcoreapplication.h>
 #include <qsocketnotifier.h>
 #include <qtimer.h>
@@ -1639,7 +1639,7 @@ bool QProcess::waitForBytesWritten(int msecs)
     if (d->processState == QProcess::NotRunning)
         return false;
     if (d->processState == QProcess::Starting) {
-        QTime stopWatch;
+        QElapsedTimer stopWatch;
         stopWatch.start();
         bool started = waitForStarted(msecs);
         if (!started)
@@ -1676,7 +1676,7 @@ bool QProcess::waitForFinished(int msecs)
     if (d->processState == QProcess::NotRunning)
         return false;
     if (d->processState == QProcess::Starting) {
-        QTime stopWatch;
+        QElapsedTimer stopWatch;
         stopWatch.start();
         bool started = waitForStarted(msecs);
         if (!started)
diff --git a/src/corelib/io/qprocess_unix.cpp b/src/corelib/io/qprocess_unix.cpp
index 5119ec0..216c382 100644
--- a/src/corelib/io/qprocess_unix.cpp
+++ b/src/corelib/io/qprocess_unix.cpp
@@ -92,7 +92,6 @@ QT_END_NAMESPACE
 
 #include <private/qcoreapplication_p.h>
 #include <private/qthread_p.h>
-#include <qdatetime.h>
 #include <qfile.h>
 #include <qfileinfo.h>
 #include <qlist.h>
@@ -101,6 +100,7 @@ QT_END_NAMESPACE
 #include <qsemaphore.h>
 #include <qsocketnotifier.h>
 #include <qthread.h>
+#include <qelapsedtimer.h>
 
 #include <errno.h>
 #include <stdlib.h>
@@ -933,7 +933,7 @@ bool QProcessPrivate::waitForReadyRead(int msecs)
     qDebug("QProcessPrivate::waitForReadyRead(%d)", msecs);
 #endif
 
-    QTime stopWatch;
+    QElapsedTimer stopWatch;
     stopWatch.start();
 
     forever {
@@ -1005,7 +1005,7 @@ bool QProcessPrivate::waitForBytesWritten(int msecs)
     qDebug("QProcessPrivate::waitForBytesWritten(%d)", msecs);
 #endif
 
-    QTime stopWatch;
+    QElapsedTimer stopWatch;
     stopWatch.start();
 
     while (!writeBuffer.isEmpty()) {
@@ -1072,7 +1072,7 @@ bool QProcessPrivate::waitForFinished(int msecs)
     qDebug("QProcessPrivate::waitForFinished(%d)", msecs);
 #endif
 
-    QTime stopWatch;
+    QElapsedTimer stopWatch;
     stopWatch.start();
 
     forever {
diff --git a/src/corelib/kernel/qcore_unix.cpp b/src/corelib/kernel/qcore_unix.cpp
index 0fd965b..e0d92c0 100644
--- a/src/corelib/kernel/qcore_unix.cpp
+++ b/src/corelib/kernel/qcore_unix.cpp
@@ -40,6 +40,7 @@
 ****************************************************************************/
 
 #include "qcore_unix_p.h"
+#include "qelapsedtimer.h"
 
 #ifndef Q_OS_VXWORKS
 # if !defined(Q_OS_HPUX) || defined(__ia64)
@@ -56,74 +57,12 @@
 #include <mach/mach_time.h>
 #endif
 
-#if !defined(QT_NO_CLOCK_MONOTONIC)
-# if defined(QT_BOOTSTRAPPED)
-#  define QT_NO_CLOCK_MONOTONIC
-# endif
-#endif
-
 QT_BEGIN_NAMESPACE
 
-bool qt_gettime_is_monotonic()
-{
-#if (_POSIX_MONOTONIC_CLOCK-0 > 0) || defined(Q_OS_MAC)
-    return true;
-#else
-    static int returnValue = 0;
-
-    if (returnValue == 0) {
-#  if (_POSIX_MONOTONIC_CLOCK-0 < 0)
-        returnValue = -1;
-#  elif (_POSIX_MONOTONIC_CLOCK == 0)
-        // detect if the system support monotonic timers
-        long x = sysconf(_SC_MONOTONIC_CLOCK);
-        returnValue = (x >= 200112L) ? 1 : -1;
-#  endif
-    }
-
-    return returnValue != -1;
-#endif
-}
-
-timeval qt_gettime()
-{
-    timeval tv;
-#if defined(Q_OS_MAC)
-    static mach_timebase_info_data_t info = {0,0};
-    if (info.denom == 0)
-        mach_timebase_info(&info);
-
-    uint64_t cpu_time = mach_absolute_time();
-    uint64_t nsecs = cpu_time * (info.numer / info.denom);
-    tv.tv_sec = nsecs / 1000000000ull;
-    tv.tv_usec = (nsecs / 1000) - (tv.tv_sec * 1000000);
-    return tv;
-#elif (_POSIX_MONOTONIC_CLOCK-0 > 0)
-    timespec ts;
-    clock_gettime(CLOCK_MONOTONIC, &ts);
-    tv.tv_sec = ts.tv_sec;
-    tv.tv_usec = ts.tv_nsec / 1000;
-    return tv;
-#else
-#  if !defined(QT_NO_CLOCK_MONOTONIC) && !defined(QT_BOOTSTRAPPED)
-    if (qt_gettime_is_monotonic()) {
-        timespec ts;
-        clock_gettime(CLOCK_MONOTONIC, &ts);
-        tv.tv_sec = ts.tv_sec;
-        tv.tv_usec = ts.tv_nsec / 1000;
-        return tv;
-    }
-#  endif
-    // use gettimeofday
-    ::gettimeofday(&tv, 0);
-    return tv;
-#endif
-}
-
 static inline bool time_update(struct timeval *tv, const struct timeval &start,
                                const struct timeval &timeout)
 {
-    if (!qt_gettime_is_monotonic()) {
+    if (!QElapsedTimer::isMonotonic()) {
         // we cannot recalculate the timeout without a monotonic clock as the time may have changed
         return false;
     }
diff --git a/src/corelib/kernel/qcore_unix_p.h b/src/corelib/kernel/qcore_unix_p.h
index 297b25d..439ca5a 100644
--- a/src/corelib/kernel/qcore_unix_p.h
+++ b/src/corelib/kernel/qcore_unix_p.h
@@ -314,8 +314,8 @@ static inline pid_t qt_safe_waitpid(pid_t pid, int *status, int options)
 #  define _POSIX_MONOTONIC_CLOCK -1
 #endif
 
-bool qt_gettime_is_monotonic();
-timeval qt_gettime();
+timeval qt_gettime(); // in qelapsedtimer_mac.cpp or qtimestamp_unix.cpp
+
 Q_CORE_EXPORT int qt_safe_select(int nfds, fd_set *fdread, fd_set *fdwrite, fd_set *fdexcept,
                                  const struct timeval *tv);
 
diff --git a/src/corelib/kernel/qcoreapplication.cpp b/src/corelib/kernel/qcoreapplication.cpp
index 2da5a7d..8fc3fb8 100644
--- a/src/corelib/kernel/qcoreapplication.cpp
+++ b/src/corelib/kernel/qcoreapplication.cpp
@@ -47,7 +47,6 @@
 #include "qeventloop.h"
 #include "qcorecmdlineargs_p.h"
 #include <qdatastream.h>
-#include <qdatetime.h>
 #include <qdebug.h>
 #include <qdir.h>
 #include <qfile.h>
@@ -59,6 +58,7 @@
 #include <qthreadpool.h>
 #include <qthreadstorage.h>
 #include <private/qthread_p.h>
+#include <qelapsedtimer.h>
 #include <qlibraryinfo.h>
 #include <qvarlengtharray.h>
 #include <private/qfactoryloader_p.h>
@@ -917,7 +917,7 @@ void QCoreApplication::processEvents(QEventLoop::ProcessEventsFlags flags, int m
     QThreadData *data = QThreadData::current();
     if (!data->eventDispatcher)
         return;
-    QTime start;
+    QElapsedTimer start;
     start.start();
     if (flags & QEventLoop::DeferredDeletion)
         QCoreApplication::sendPostedEvents(0, QEvent::DeferredDelete);
diff --git a/src/corelib/kernel/qeventdispatcher_unix.cpp b/src/corelib/kernel/qeventdispatcher_unix.cpp
index a141887..f7d45ac 100644
--- a/src/corelib/kernel/qeventdispatcher_unix.cpp
+++ b/src/corelib/kernel/qeventdispatcher_unix.cpp
@@ -45,6 +45,7 @@
 #include "qpair.h"
 #include "qsocketnotifier.h"
 #include "qthread.h"
+#include "qelapsedtimer.h"
 
 #include "qeventdispatcher_unix_p.h"
 #include <private/qthread_p.h>
@@ -311,12 +312,10 @@ int QEventDispatcherUNIXPrivate::doSelect(QEventLoop::ProcessEventsFlags flags,
 
 QTimerInfoList::QTimerInfoList()
 {
-    currentTime = qt_gettime();
-
 #if (_POSIX_MONOTONIC_CLOCK-0 <= 0) && !defined(Q_OS_MAC)
-    if (!qt_gettime_is_monotonic()) {
+    if (!QElapsedTimer::isMonotonic()) {
         // not using monotonic timers, initialize the timeChanged() machinery
-        previousTime = currentTime;
+        previousTime = qt_gettime();
 
         tms unused;
         previousTicks = times(&unused);
@@ -393,7 +392,7 @@ bool QTimerInfoList::timeChanged(timeval *delta)
 
 void QTimerInfoList::repairTimersIfNeeded()
 {
-    if (qt_gettime_is_monotonic())
+    if (QElapsedTimer::isMonotonic())
         return;
     timeval delta;
     if (timeChanged(&delta))
diff --git a/src/corelib/thread/qthread.cpp b/src/corelib/thread/qthread.cpp
index dd0c257..cb84538 100644
--- a/src/corelib/thread/qthread.cpp
+++ b/src/corelib/thread/qthread.cpp
@@ -617,7 +617,9 @@ QThread::Priority QThread::priority() const
 {
     Q_D(const QThread);
     QMutexLocker locker(&d->mutex);
-    return d->priority;
+
+    // mask off the high bits that are used for flags
+    return Priority(d->priority & 0xffff);
 }
 
 /*!
diff --git a/src/corelib/thread/qthread_unix.cpp b/src/corelib/thread/qthread_unix.cpp
index cda35a4..5a50646 100644
--- a/src/corelib/thread/qthread_unix.cpp
+++ b/src/corelib/thread/qthread_unix.cpp
@@ -92,10 +92,17 @@
 # endif
 #endif
 
+#if defined(Q_OS_LINUX) && !defined(SCHED_IDLE)
+// from linux/sched.h
+# define SCHED_IDLE    5
+#endif
+
 QT_BEGIN_NAMESPACE
 
 #ifndef QT_NO_THREAD
 
+enum { ThreadPriorityResetFlag = 0x80000000 };
+
 static pthread_once_t current_thread_data_once = PTHREAD_ONCE_INIT;
 static pthread_key_t current_thread_data_key;
 
@@ -221,6 +228,11 @@ void *QThreadPrivate::start(void *arg)
     QThread *thr = reinterpret_cast<QThread *>(arg);
     QThreadData *data = QThreadData::get2(thr);
 
+    // do we need to reset the thread priority?
+    if (int(thr->d_func()->priority) & ThreadPriorityResetFlag) {
+        thr->setPriority(QThread::Priority(thr->d_func()->priority & ~ThreadPriorityResetFlag));
+    }
+
 #ifdef Q_OS_SYMBIAN
     // Because Symbian Open C does not provide a way to convert between
     // RThread and pthread_t, we must delay initialization of the RThread
@@ -436,6 +448,37 @@ void QThread::usleep(unsigned long usecs)
     thread_sleep(&ti);
 }
 
+// Does some magic and calculate the Unix scheduler priorities
+// sched_policy is IN/OUT: it must be set to a valid policy before calling this function
+// sched_priority is OUT only
+static bool calculateUnixPriority(int priority, int *sched_policy, int *sched_priority)
+{
+#ifdef SCHED_IDLE
+    if (priority == QThread::IdlePriority) {
+        *sched_policy = SCHED_IDLE;
+        *sched_priority = 0;
+        return true;
+    }
+    const int lowestPriority = QThread::LowestPriority;
+#else
+    const int lowestPriority = QThread::IdlePriority;
+#endif
+    const int highestPriority = QThread::TimeCriticalPriority;
+
+    int prio_min = sched_get_priority_min(*sched_policy);
+    int prio_max = sched_get_priority_max(*sched_policy);
+    if (prio_min == -1 || prio_max == -1)
+        return false;
+
+    int prio;
+    // crudely scale our priority enum values to the prio_min/prio_max
+    prio = ((priority - lowestPriority) * (prio_max - prio_min) / highestPriority) + prio_min;
+    prio = qMax(prio_min, qMin(prio_max, prio));
+
+    *sched_priority = prio;
+    return true;
+}
+
 void QThread::start(Priority priority)
 {
     Q_D(QThread);
@@ -472,32 +515,14 @@ void QThread::start(Priority priority)
                 break;
             }
 
-            int prio_min = sched_get_priority_min(sched_policy);
-            int prio_max = sched_get_priority_max(sched_policy);
-            if (prio_min == -1 || prio_max == -1) {
+            int prio;
+            if (!calculateUnixPriority(priority, &sched_policy, &prio)) {
                 // failed to get the scheduling parameters, don't
                 // bother setting the priority
                 qWarning("QThread::start: Cannot determine scheduler priority range");
                 break;
             }
 
-            int prio;
-            switch (priority) {
-            case IdlePriority:
-                prio = prio_min;
-                break;
-
-            case TimeCriticalPriority:
-                prio = prio_max;
-                break;
-
-            default:
-                // crudely scale our priority enum values to the prio_min/prio_max
-                prio = (priority * (prio_max - prio_min) / TimeCriticalPriority) + prio_min;
-                prio = qMax(prio_min, qMin(prio_max, prio));
-                break;
-            }
-
             sched_param sp;
             sp.sched_priority = prio;
 
@@ -505,7 +530,9 @@ void QThread::start(Priority priority)
                 || pthread_attr_setschedpolicy(&attr, sched_policy) != 0
                 || pthread_attr_setschedparam(&attr, &sp) != 0) {
                 // could not set scheduling hints, fallback to inheriting them
+                // we'll try again from inside the thread
                 pthread_attr_setinheritsched(&attr, PTHREAD_INHERIT_SCHED);
+                d->priority = Priority(priority | ThreadPriorityResetFlag);
             }
             break;
         }
@@ -672,38 +699,28 @@ void QThread::setPriority(Priority priority)
         return;
     }
 
-    int prio_min = sched_get_priority_min(sched_policy);
-    int prio_max = sched_get_priority_max(sched_policy);
-    if (prio_min == -1 || prio_max == -1) {
+    int prio;
+    if (!calculateUnixPriority(priority, &sched_policy, &prio)) {
         // failed to get the scheduling parameters, don't
         // bother setting the priority
         qWarning("QThread::setPriority: Cannot determine scheduler priority range");
         return;
     }
 
-    int prio;
-    switch (priority) {
-    case InheritPriority:
-        qWarning("QThread::setPriority: Argument cannot be InheritPriority");
-        return;
-
-    case IdlePriority:
-        prio = prio_min;
-        break;
-
-    case TimeCriticalPriority:
-        prio = prio_max;
-        break;
-
-    default:
-        // crudely scale our priority enum values to the prio_min/prio_max
-        prio = (priority * (prio_max - prio_min) / TimeCriticalPriority) + prio_min;
-        prio = qMax(prio_min, qMin(prio_max, prio));
-        break;
-    }
-
     param.sched_priority = prio;
-    pthread_setschedparam(d->thread_id, sched_policy, &param);
+    int status = pthread_setschedparam(d->thread_id, sched_policy, &param);
+
+# ifdef SCHED_IDLE
+    // were we trying to set to idle priority and failed?
+    if (status == -1 && sched_policy == SCHED_IDLE && errno == EINVAL) {
+        // reset to lowest priority possible
+        pthread_getschedparam(d->thread_id, &sched_policy, &param);
+        param.sched_priority = sched_get_priority_min(sched_policy);
+        pthread_setschedparam(d->thread_id, sched_policy, &param);
+    }
+# else
+    Q_UNUSED(status);
+# endif // SCHED_IDLE
 #endif
 }
 
diff --git a/src/corelib/tools/qdatetime.cpp b/src/corelib/tools/qdatetime.cpp
index c1027ed..54a4205 100644
--- a/src/corelib/tools/qdatetime.cpp
+++ b/src/corelib/tools/qdatetime.cpp
@@ -98,18 +98,23 @@ static inline QDate fixedDate(int y, int m, int d)
     return result;
 }
 
+static inline uint julianDayFromGregorianDate(int year, int month, int day)
+{
+    // Gregorian calendar starting from October 15, 1582
+    // Algorithm from Henry F. Fliegel and Thomas C. Van Flandern
+    return (1461 * (year + 4800 + (month - 14) / 12)) / 4
+           + (367 * (month - 2 - 12 * ((month - 14) / 12))) / 12
+           - (3 * ((year + 4900 + (month - 14) / 12) / 100)) / 4
+           + day - 32075;
+}
+
 static uint julianDayFromDate(int year, int month, int day)
 {
     if (year < 0)
         ++year;
 
     if (year > 1582 || (year == 1582 && (month > 10 || (month == 10 && day >= 15)))) {
-        // Gregorian calendar starting from October 15, 1582
-        // Algorithm from Henry F. Fliegel and Thomas C. Van Flandern
-        return (1461 * (year + 4800 + (month - 14) / 12)) / 4
-               + (367 * (month - 2 - 12 * ((month - 14) / 12))) / 12
-               - (3 * ((year + 4900 + (month - 14) / 12) / 100)) / 4
-               + day - 32075;
+        return julianDayFromGregorianDate(year, month, day);
     } else if (year < 1582 || (year == 1582 && (month < 10 || (month == 10 && day <= 4)))) {
         // Julian calendar until October 4, 1582
         // Algorithm from Frequently Asked Questions about Calendars by Claus Toendering
@@ -1118,46 +1123,12 @@ int QDate::daysTo(const QDate &d) const
 */
 
 /*!
-    \overload
+    \fn QDate::currentDate()
     Returns the current date, as reported by the system clock.
 
     \sa QTime::currentTime(), QDateTime::currentDateTime()
 */
 
-QDate QDate::currentDate()
-{
-    QDate d;
-#if defined(Q_OS_WIN)
-    SYSTEMTIME st;
-    memset(&st, 0, sizeof(SYSTEMTIME));
-    GetLocalTime(&st);
-    d.jd = julianDayFromDate(st.wYear, st.wMonth, st.wDay);
-#elif defined(Q_OS_SYMBIAN)
-    TTime localTime;
-    localTime.HomeTime();
-    TDateTime localDateTime = localTime.DateTime();
-    // months and days are zero indexed
-    d.jd = julianDayFromDate(localDateTime.Year(), localDateTime.Month() + 1, localDateTime.Day() + 1 );
-#else
-    // posix compliant system
-    time_t ltime;
-    time(&ltime);
-    tm *t = 0;
-
-#if !defined(QT_NO_THREAD) && defined(_POSIX_THREAD_SAFE_FUNCTIONS)
-    // use the reentrant version of localtime() where available
-    tzset();
-    tm res;
-    t = localtime_r(&ltime, &res);
-#else
-    t = localtime(&ltime);
-#endif // !QT_NO_THREAD && _POSIX_THREAD_SAFE_FUNCTIONS
-
-    d.jd = julianDayFromDate(t->tm_year + 1900, t->tm_mon + 1, t->tm_mday);
-#endif
-    return d;
-}
-
 #ifndef QT_NO_DATESTRING
 /*!
     \fn QDate QDate::fromString(const QString &string, Qt::DateFormat format)
@@ -1812,7 +1783,7 @@ int QTime::msecsTo(const QTime &t) const
 */
 
 /*!
-    \overload
+    \fn QTime::currentTime()
 
     Returns the current time as reported by the system clock.
 
@@ -1820,53 +1791,6 @@ int QTime::msecsTo(const QTime &t) const
     operating system; not all systems provide 1-millisecond accuracy.
 */
 
-QTime QTime::currentTime()
-{
-    QTime ct;
-
-#if defined(Q_OS_WIN)
-    SYSTEMTIME st;
-    memset(&st, 0, sizeof(SYSTEMTIME));
-    GetLocalTime(&st);
-    ct.mds = MSECS_PER_HOUR * st.wHour + MSECS_PER_MIN * st.wMinute + 1000 * st.wSecond
-             + st.wMilliseconds;
-#if defined(Q_OS_WINCE)
-    ct.startTick = GetTickCount() % MSECS_PER_DAY;
-#endif
-#elif defined(Q_OS_SYMBIAN)
-    TTime localTime;
-    localTime.HomeTime();
-    TDateTime localDateTime = localTime.DateTime();
-    ct.mds = MSECS_PER_HOUR * localDateTime.Hour() + MSECS_PER_MIN * localDateTime.Minute()
-                 + 1000 * localDateTime.Second() + (localDateTime.MicroSecond() / 1000);
-#elif defined(Q_OS_UNIX)
-    // posix compliant system
-    struct timeval tv;
-    gettimeofday(&tv, 0);
-    time_t ltime = tv.tv_sec;
-    tm *t = 0;
-
-#if !defined(QT_NO_THREAD) && defined(_POSIX_THREAD_SAFE_FUNCTIONS)
-    // use the reentrant version of localtime() where available
-    tzset();
-    tm res;
-    t = localtime_r(&ltime, &res);
-#else
-    t = localtime(&ltime);
-#endif
-    Q_CHECK_PTR(t);
-
-    ct.mds = MSECS_PER_HOUR * t->tm_hour + MSECS_PER_MIN * t->tm_min + 1000 * t->tm_sec
-             + tv.tv_usec / 1000;
-#else
-    time_t ltime; // no millisecond resolution
-    ::time(&ltime);
-    const tm *const t = localtime(&ltime);
-    ct.mds = MSECS_PER_HOUR * t->tm_hour + MSECS_PER_MIN * t->tm_min + 1000 * t->tm_sec;
-#endif
-    return ct;
-}
-
 #ifndef QT_NO_DATESTRING
 /*!
     \fn QTime QTime::fromString(const QString &string, Qt::DateFormat format)
@@ -2872,63 +2796,280 @@ bool QDateTime::operator<(const QDateTime &other) const
 */
 
 /*!
+    \fn QDateTime QDateTime::currentDateTime()
     Returns the current datetime, as reported by the system clock, in
     the local time zone.
 
-    \sa QDate::currentDate(), QTime::currentTime(), toTimeSpec()
+    \sa currentDateTimeUtc(), QDate::currentDate(), QTime::currentTime(), toTimeSpec()
 */
 
-QDateTime QDateTime::currentDateTime()
+/*!
+    \fn QDateTime QDateTime::currentDateTimeUtc()
+    \since 4.7
+    Returns the current datetime, as reported by the system clock, in
+    UTC.
+
+    \sa currentDateTime(), QDate::currentDate(), QTime::currentTime(), toTimeSpec()
+*/
+
+/*!
+    \fn qint64 QDateTime::currentMsecsSinceEpoch()
+    \since 4.7
+
+    Returns the number of milliseconds since 1970-01-01T00:00:00 Universal
+    Coordinated Time. This number is like the POSIX time_t variable, but
+    expressed in milliseconds instead.
+
+    \sa currentDateTime(), currentDateTimeUtc(), toTime_t(), toTimeSpec()
+*/
+
+static inline uint msecsFromDecomposed(int hour, int minute, int sec, int msec = 0)
 {
+    return MSECS_PER_HOUR * hour + MSECS_PER_MIN * minute + 1000 * sec + msec;
+}
+
 #if defined(Q_OS_WIN)
+QDate QDate::currentDate()
+{
+    QDate d;
+    SYSTEMTIME st;
+    memset(&st, 0, sizeof(SYSTEMTIME));
+    GetLocalTime(&st);
+    d.jd = julianDayFromDate(st.wYear, st.wMonth, st.wDay);
+    return d;
+}
+
+QTime QTime::currentTime()
+{
+    QTime ct;
+    SYSTEMTIME st;
+    memset(&st, 0, sizeof(SYSTEMTIME));
+    GetLocalTime(&st);
+    ct.mds = msecsFromDecomposed(st.wHour, st.wMinute, st.wSecond, st.wMilliseconds);
+#if defined(Q_OS_WINCE)
+    ct.startTick = GetTickCount() % MSECS_PER_DAY;
+#endif
+    return ct;
+}
+
+QDateTime QDateTime::currentDateTime()
+{
     QDate d;
     QTime t;
     SYSTEMTIME st;
     memset(&st, 0, sizeof(SYSTEMTIME));
     GetLocalTime(&st);
     d.jd = julianDayFromDate(st.wYear, st.wMonth, st.wDay);
-    t.mds = MSECS_PER_HOUR * st.wHour + MSECS_PER_MIN * st.wMinute + 1000 * st.wSecond
-            + st.wMilliseconds;
+    t.mds = msecsFromDecomposed(st.wHour, st.wMinute, st.wSecond, st.wMilliseconds);
     return QDateTime(d, t);
+}
+
+QDateTime QDateTime::currentDateTimeUtc()
+{
+    QDate d;
+    QTime t;
+    SYSTEMTIME st;
+    memset(&st, 0, sizeof(SYSTEMTIME));
+    GetSystemTime(&st);
+    d.jd = julianDayFromDate(st.wYear, st.wMonth, st.wDay);
+    t.mds = msecsFromDecomposed(st.wHour, st.wMinute, st.wSecond, st.wMilliseconds);
+    return QDateTime(d, t, Qt::UTC);
+}
+
+qint64 QDateTime::currentMsecsSinceEpoch()
+{
+    QDate d;
+    QTime t;
+    SYSTEMTIME st;
+    memset(&st, 0, sizeof(SYSTEMTIME));
+    GetSystemTime(&st);
+
+    return msecsFromDecomposed(st.wHour, st.wMinute, st.wSecond, st.wMilliseconds) +
+            qint64(julianDayFromGregorianDate(st.wYear, st.wMonth, st.wDay)
+                   - julianDayFromGregorianDate(1970, 1, 1)) * Q_INT64_C(86400000);
+}
+
 #elif defined(Q_OS_SYMBIAN)
-    return QDateTime(QDate::currentDate(), QTime::currentTime());
+QDate QDate::currentDate()
+{
+    QDate d;
+    TTime localTime;
+    localTime.HomeTime();
+    TDateTime localDateTime = localTime.DateTime();
+    // months and days are zero indexed
+    d.jd = julianDayFromDate(localDateTime.Year(), localDateTime.Month() + 1, localDateTime.Day() + 1 );
+    return d;
+}
+
+QTime QTime::currentTime()
+{
+    QTime ct;
+    TTime localTime;
+    localTime.HomeTime();
+    TDateTime localDateTime = localTime.DateTime();
+    ct.mds = msecsFromDecomposed(localDateTime.Hour(), localDateTime.Minute(),
+                                 localDateTime.Second(), localDateTime.MicroSecond() / 1000);
+    return ct;
+}
+
+QDateTime QDateTime::currentDateTime()
+{
+    QDate d;
+    QTime ct;
+    TTime localTime;
+    localTime.HomeTime();
+    TDateTime localDateTime = localTime.DateTime();
+    // months and days are zero indexed
+    d.jd = julianDayFromDate(localDateTime.Year(), localDateTime.Month() + 1, localDateTime.Day() + 1);
+    ct.mds = msecsFromDecomposed(localDateTime.Hour(), localDateTime.Minute(),
+                                 localDateTime.Second(), localDateTime.MicroSecond() / 1000);
+    return QDateTime(d, ct);
+}
+
+QDateTime QDateTime::currentDateTimeUtc()
+{
+    QDate d;
+    QTime ct;
+    TTime gmTime;
+    gmTime.UniversalTime();
+    TDateTime gmtDateTime = gmTime.DateTime();
+    // months and days are zero indexed
+    d.jd = julianDayFromDate(gmtDateTime.Year(), gmtDateTime.Month() + 1, gmtDateTime.Day() + 1);
+    ct.mds = msecsFromDecomposed(gmtDateTime.Hour(), gmtDateTime.Minute(),
+                                 gmtDateTime.Second(), gmtDateTime.MicroSecond() / 1000);
+    return QDateTime(d, ct, Qt::UTC);
+}
+
+qint64 QDateTime::currentMsecsSinceEpoch()
+{
+    QDate d;
+    QTime ct;
+    TTime gmTime;
+    gmTime.UniversalTime();
+    TDateTime gmtDateTime = gmTime.DateTime();
+
+    // according to the documentation, the value is:
+    // "a date and time as a number of microseconds since midnight, January 1st, 0 AD nominal Gregorian"
+    qint64 value = gmTime.Int64();
+
+    // whereas 1970-01-01T00:00:00 is (in the same representation):
+    //   ((1970 * 365) + (1970 / 4) - (1970 / 100) + (1970 / 400) - 13) * 86400 * 1000000
+    static const qint64 unixEpoch = Q_INT64_C(0xdcddb30f2f8000);
+
+    return (value - unixEpoch) / 1000;
+}
+
+#elif defined(Q_OS_UNIX)
+QDate QDate::currentDate()
+{
+    QDate d;
+    // posix compliant system
+    time_t ltime;
+    time(&ltime);
+    struct tm *t = 0;
+
+#if !defined(QT_NO_THREAD) && defined(_POSIX_THREAD_SAFE_FUNCTIONS)
+    // use the reentrant version of localtime() where available
+    tzset();
+    struct tm res;
+    t = localtime_r(&ltime, &res);
 #else
-#if defined(Q_OS_UNIX)
+    t = localtime(&ltime);
+#endif // !QT_NO_THREAD && _POSIX_THREAD_SAFE_FUNCTIONS
+
+    d.jd = julianDayFromDate(t->tm_year + 1900, t->tm_mon + 1, t->tm_mday);
+    return d;
+}
+
+QTime QTime::currentTime()
+{
+    QTime ct;
+    // posix compliant system
+    struct timeval tv;
+    gettimeofday(&tv, 0);
+    time_t ltime = tv.tv_sec;
+    struct tm *t = 0;
+
+#if !defined(QT_NO_THREAD) && defined(_POSIX_THREAD_SAFE_FUNCTIONS)
+    // use the reentrant version of localtime() where available
+    tzset();
+    struct tm res;
+    t = localtime_r(&ltime, &res);
+#else
+    t = localtime(&ltime);
+#endif
+    Q_CHECK_PTR(t);
+
+    ct.mds = msecsFromDecomposed(t->tm_hour, t->tm_min, t->tm_sec, tv.tv_usec / 1000);
+    return ct;
+}
+
+QDateTime QDateTime::currentDateTime()
+{
     // posix compliant system
     // we have milliseconds
     struct timeval tv;
     gettimeofday(&tv, 0);
     time_t ltime = tv.tv_sec;
-    tm *t = 0;
+    struct tm *t = 0;
 
 #if !defined(QT_NO_THREAD) && defined(_POSIX_THREAD_SAFE_FUNCTIONS)
     // use the reentrant version of localtime() where available
     tzset();
-    tm res;
+    struct tm res;
     t = localtime_r(&ltime, &res);
 #else
     t = localtime(&ltime);
 #endif
 
     QDateTime dt;
-    dt.d->time.mds = MSECS_PER_HOUR * t->tm_hour + MSECS_PER_MIN * t->tm_min + 1000 * t->tm_sec
-                     + tv.tv_usec / 1000;
-#else
-    time_t ltime; // no millisecond resolution
-    ::time(&ltime);
-    tm *t = 0;
-    localtime(&ltime);
-    dt.d->time.mds = MSECS_PER_HOUR * t->tm_hour + MSECS_PER_MIN * t->tm_min + 1000 * t->tm_sec;
-#endif // Q_OS_UNIX
+    dt.d->time.mds = msecsFromDecomposed(t->tm_hour, t->tm_min, t->tm_sec, tv.tv_usec / 1000);
 
     dt.d->date.jd = julianDayFromDate(t->tm_year + 1900, t->tm_mon + 1, t->tm_mday);
     dt.d->spec = t->tm_isdst > 0  ? QDateTimePrivate::LocalDST :
                  t->tm_isdst == 0 ? QDateTimePrivate::LocalStandard :
                  QDateTimePrivate::LocalUnknown;
     return dt;
+}
+
+QDateTime QDateTime::currentDateTimeUtc()
+{
+    // posix compliant system
+    // we have milliseconds
+    struct timeval tv;
+    gettimeofday(&tv, 0);
+    time_t ltime = tv.tv_sec;
+    struct tm *t = 0;
+
+#if !defined(QT_NO_THREAD) && defined(_POSIX_THREAD_SAFE_FUNCTIONS)
+    // use the reentrant version of localtime() where available
+    struct tm res;
+    t = gmtime_r(&ltime, &res);
+#else
+    t = gmtime(&ltime);
 #endif
+
+    QDateTime dt;
+    dt.d->time.mds = msecsFromDecomposed(t->tm_hour, t->tm_min, t->tm_sec, tv.tv_usec / 1000);
+
+    dt.d->date.jd = julianDayFromDate(t->tm_year + 1900, t->tm_mon + 1, t->tm_mday);
+    dt.d->spec = QDateTimePrivate::UTC;
+    return dt;
 }
 
+qint64 QDateTime::currentMsecsSinceEpoch()
+{
+    // posix compliant system
+    // we have milliseconds
+    struct timeval tv;
+    gettimeofday(&tv, 0);
+    return qint64(tv.tv_sec) * Q_INT64_C(1000) + tv.tv_usec / 1000;
+}
+
+#else
+#error "What system is this?"
+#endif
+
 /*!
   \since 4.2
 
diff --git a/src/corelib/tools/qdatetime.h b/src/corelib/tools/qdatetime.h
index 6fdc855..ef5968e 100644
--- a/src/corelib/tools/qdatetime.h
+++ b/src/corelib/tools/qdatetime.h
@@ -261,11 +261,13 @@ public:
     int utcOffset() const;
 
     static QDateTime currentDateTime();
+    static QDateTime currentDateTimeUtc();
 #ifndef QT_NO_DATESTRING
     static QDateTime fromString(const QString &s, Qt::DateFormat f = Qt::TextDate);
     static QDateTime fromString(const QString &s, const QString &format);
 #endif
     static QDateTime fromTime_t(uint secsSince1Jan1970UTC);
+    static qint64 currentMsecsSinceEpoch();
 
 #ifdef QT3_SUPPORT
     inline QT3_SUPPORT void setTime_t(uint secsSince1Jan1970UTC, Qt::TimeSpec spec) {
diff --git a/src/corelib/tools/qelapsedtimer.cpp b/src/corelib/tools/qelapsedtimer.cpp
new file mode 100644
index 0000000..28dfc23
--- /dev/null
+++ b/src/corelib/tools/qelapsedtimer.cpp
@@ -0,0 +1,251 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qelapsedtimer.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class QElapsedTimer
+    \brief The QElapsedTimer class provides a fast way to calculate elapsed times.
+    \since 4.7
+
+    \reentrant
+    \ingroup tools
+    \inmodule QtCore
+
+    The QElapsedTimer class is usually used to quickly calculate how much
+    time has elapsed between two events. Its API is similar to that of QTime,
+    so code that was using that can be ported quickly to the new class.
+
+    However, unlike QTime, QElapsedTimer tries to use monotonic clocks if
+    possible. This means it's not possible to convert QElapsedTimer objects
+    to a human-readable time.
+
+    The typical use-case for the class is to determine how much time was
+    spent in a slow operation. The simplest example of such a case is for
+    debugging purposes, as in the following example:
+
+    \snippet doc/src/snippets/qelapsedtimer/main.cpp 0
+
+    In this example, the timer is started by a call to start() and the
+    elapsed timer is calculated by the elapsed() function.
+
+    The time elapsed can also be used to recalculate the time available for
+    another operation, after the first one is complete. This is useful when
+    the execution must complete within a certain time period, but several
+    steps are needed. The \tt{waitFor}-type functions in QIODevice and its
+    subclasses are good examples of such need. In that case, the code could
+    be as follows:
+
+    \snippet doc/src/snippets/qelapsedtimer/main.cpp 1
+
+    Another use-case is to execute a certain operation for a specific
+    timeslice. For this, QElapsedTimer provides the hasExpired() convenience
+    function, which can be used to determine if a certain number of
+    milliseconds has already elapsed:
+
+    \snippet doc/src/snippets/qelapsedtimer/main.cpp 1
+
+    \section1 Reference clocks
+
+    QElapsedTimer will use the platform's monotonic reference clock in all
+    platforms that support it (see QElapsedTimer::isMonotonic()). This has
+    the added benefit that QElapsedTimer is immune to time adjustments, such
+    as the user correcting the time. Also unlike QTime, QElapsedTimer is
+    immune to changes in the timezone settings, such as daylight savings
+    periods.
+
+    On the other hand, this means QElapsedTimer values can only be compared
+    with other values that use the same reference. This is especially true if
+    the time since the reference is extracted from the QElapsedTimer object
+    (QElapsedTimer::msecsSinceReference()) and serialised. These values
+    should never be exchanged across the network or saved to disk, since
+    there's no telling whether the computer node receiving the data is the
+    same as the one originating it or if it has rebooted since.
+
+    It is, however, possible to exchange the value with other processes
+    running on the same machine, provided that they also use the same
+    reference clock. QElapsedTimer will always use the same clock, so it's
+    safe to compare with the value coming from another process in the same
+    machine. If comparing to values produced by other APIs, you should check
+    that the clock used is the same as QElapsedTimer (see
+    QElapsedTimer::clockType()).
+
+    \section2 32-bit overflows
+
+    Some of the clocks that QElapsedTimer have a limited range and may
+    overflow after hitting the upper limit (usually 32-bit). QElapsedTimer
+    deals with this overflow issue and presents a consistent timing. However,
+    when extracting the time since reference from QElapsedTimer, two
+    different processes in the same machine may have different understanding
+    of how much time has actually elapsed.
+
+    The information on which clocks types may overflow and how to remedy that
+    issue is documented along with the clock types.
+
+    \sa QTime, QTimer
+*/
+
+/*!
+    \enum QElapsedTimer::ClockType
+
+    This enum contains the different clock types that QElapsedTimer may use.
+
+    QElapsedTimer will always use the same clock type in a particular
+    machine, so this value will not change during the lifetime of a program.
+    It is provided so that QElapsedTimer can be used with other non-Qt
+    implementations, to guarantee that the same reference clock is being
+    used.
+
+    \value SystemTime       The human-readable system time. This clock is not monotonic.
+    \value MonotonicClock   The system's monotonic clock, usually found in Unix systems. This clock is not monotonic and does not overflow.
+    \value TickCounter      The system's tick counter, used on Windows and Symbian systems. This clock may overflow.
+    \value MachAbsoluteTime The Mach kernel's absolute time (Mac OS X). This clock is monotonic and does not overflow.
+
+    \section2 SystemTime
+
+    The system time clock is purely the real time, expressed in milliseconds
+    since Jan 1, 1970 at 0:00 UTC. It's equivalent to the value returned by
+    the C and POSIX \tt{time} function, with the milliseconds added. This
+    clock type is currently only used on Unix systems that do not support
+    monotonic clocks (see below).
+
+    This is the only non-monotonic clock that QElapsedTimer may use.
+
+    \section2 MonotonicClock
+
+    This is the system's monotonic clock, expressed in milliseconds since an
+    arbitrary point in the past. This clock type is used on Unix systems
+    which support POSIX monotonic clocks (\tt{_POSIX_MONOTONIC_CLOCK}).
+
+    This clock does not overflow.
+
+    \section2 TickCounter
+
+    The tick counter clock type is based on the system's or the processor's
+    tick counter, multiplied by the duration of a tick. This clock type is
+    used on Windows and Symbian platforms.
+
+    The TickCounter clock type is the only clock type that may overflow.
+    Windows Vista and Windows Server 2008 support the extended 64-bit tick
+    counter, which allows avoiding the overflow.
+
+    On Windows systems, the clock overflows after 2^32 milliseconds, which
+    corresponds to roughly 49.7 days. This means two processes's reckoning of
+    the time since the reference may be different by multiples of 2^32
+    milliseconds. When comparing such values, it's recommended that the high
+    32 bits of the millisecond count be masked off.
+
+    On Symbian systems, the overflow happens after 2^32 ticks, the duration
+    of which can be obtained from the platform HAL using the constant
+    HAL::ENanoTickPeriod. When comparing values between processes, it's
+    necessary to divide the value by the tick duration and mask off the high
+    32 bits.
+
+    \section2 MachAbsoluteTime
+
+    This clock type is based on the absolute time presented by Mach kernels,
+    such as that found on Mac OS X. This clock type is presented separately
+    from MonotonicClock since Mac OS X is also a Unix system and may support
+    a POSIX monotonic clock with values differing from the Mach absolute
+    time.
+
+    This clock is monotonic and does not overflow.
+
+    \sa clockType(), isMonotonic()
+*/
+
+/*!
+    \fn bool QElapsedTimer::operator ==(const QElapsedTimer &other) const
+
+    Returns true if this object and \a other contain the same time.
+*/
+
+/*!
+    \fn bool QElapsedTimer::operator !=(const QElapsedTimer &other) const
+
+    Returns true if this object and \a other contain different times.
+*/
+
+static const qint64 invalidData = Q_INT64_C(0x8000000000000000);
+
+/*!
+    Marks this QElapsedTimer object as invalid.
+
+    An invalid object can be checked with isValid(). Calculations of timer
+    elapsed since invalid data are undefined and will likely produce bizarre
+    results.
+
+    \sa isValid(), start(), restart()
+*/
+void QElapsedTimer::invalidate()
+{
+     t1 = t2 = invalidData;
+}
+
+/*!
+    Returns true if this object was invalidated by a call to invalidate() and
+    has not been restarted since.
+
+    \sa invalidate(), start(), restart()
+*/
+bool QElapsedTimer::isValid() const
+{
+    return t1 != invalidData && t2 != invalidData;
+}
+
+/*!
+    Returns true if this QElapsedTimer has already expired by \a timeout
+    milliseconds (that is, more than \a timeout milliseconds have elapsed).
+    The value of \a timeout can be -1 to indicate that this timer does not
+    expire, in which case this function will always return false.
+
+    \sa elapsed()
+*/
+bool QElapsedTimer::hasExpired(qint64 timeout) const
+{
+    // if timeout is -1, quint64(timeout) is LLINT_MAX, so this will be
+    // considered as never expired
+    return quint64(elapsed()) > quint64(timeout);
+}
+
+QT_END_NAMESPACE
diff --git a/src/corelib/tools/qelapsedtimer.h b/src/corelib/tools/qelapsedtimer.h
new file mode 100644
index 0000000..0d6f0be
--- /dev/null
+++ b/src/corelib/tools/qelapsedtimer.h
@@ -0,0 +1,93 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QTIMESTAMP_H
+#define QTIMESTAMP_H
+
+#include <QtCore/qglobal.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Core)
+
+class Q_CORE_EXPORT QElapsedTimer
+{
+public:
+    enum ClockType {
+        SystemTime,
+        MonotonicClock,
+        TickCounter,
+        MachAbsoluteTime
+    };
+    static ClockType clockType();
+    static bool isMonotonic();
+
+    void start();
+    qint64 restart();
+    void invalidate();
+    bool isValid() const;
+
+    qint64 elapsed() const;
+    bool hasExpired(qint64 timeout) const;
+
+    qint64 msecsSinceReference() const;
+    qint64 msecsTo(const QElapsedTimer &other) const;
+    qint64 secsTo(const QElapsedTimer &other) const;
+
+    bool operator==(const QElapsedTimer &other) const
+    { return t1 == other.t1 && t2 == other.t2; }
+    bool operator!=(const QElapsedTimer &other) const
+    { return !(*this == other); }
+
+    friend bool Q_CORE_EXPORT operator<(const QElapsedTimer &v1, const QElapsedTimer &v2);
+
+private:
+    qint64 t1;
+    qint64 t2;
+};
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QTIMESTAMP_H
diff --git a/src/corelib/tools/qelapsedtimer_generic.cpp b/src/corelib/tools/qelapsedtimer_generic.cpp
new file mode 100644
index 0000000..9b589c1
--- /dev/null
+++ b/src/corelib/tools/qelapsedtimer_generic.cpp
@@ -0,0 +1,178 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qelapsedtimer.h"
+#include "qdatetime.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    Returns the clock type that this QElapsedTimer implementation uses.
+
+    \sa isMonotonic()
+*/
+QElapsedTimer::ClockType QElapsedTimer::clockType()
+{
+    return SystemTime;
+}
+
+/*!
+    Returns true if this is a monotonic clock, false otherwise. See the
+    information on the different clock types to understand which ones are
+    monotonic.
+
+    \sa clockType(), QElapsedTimer::ClockType
+*/
+bool QElapsedTimer::isMonotonic()
+{
+    return false;
+}
+
+/*!
+    Starts this timer. Once started, a timer value can be checked with elapsed() or msecsSinceReference().
+
+    Normally, a timer is started just before a lengthy operation, such as:
+    \snippet doc/src/snippets/qelapsedtimer/main.cpp 0
+
+    Also, starting a timer makes it valid again.
+
+    \sa restart(), invalidate(), elapsed()
+*/
+void QElapsedTimer::start()
+{
+    restart();
+}
+
+/*!
+    Restarts the timer and returns the time elapsed since the previous start.
+    This function is equivalent to obtaining the elapsed time with elapsed()
+    and then starting the timer again with restart(), but it does so in one
+    single operation, avoiding the need to obtain the clock value twice.
+
+    The following example illustrates how to use this function to calibrate a
+    parameter to a slow operation (for example, an iteration count) so that
+    this operation takes at least 250 milliseconds:
+
+    \snippet doc/src/snippets/qelapsedtimer/main.cpp 3
+
+    \sa start(), invalidate(), elapsed()
+*/
+qint64 QElapsedTimer::restart()
+{
+    qint64 old = t1;
+    t1 = QDateTime::currentMsecsSinceEpoch();
+    t2 = 0;
+    return t1 - old;
+}
+
+/*!
+    Returns the number of milliseconds since this QElapsedTimer was last
+    started. Calling this function in a QElapsedTimer that was invalidated
+    will result in undefined results.
+
+    \sa start(), restart(), hasExpired(), invalidate()
+*/
+qint64 QElapsedTimer::elapsed() const
+{
+    return QDateTime::currentMsecsSinceEpoch() - t1;
+}
+
+/*!
+    Returns the number of milliseconds between last time this QElapsedTimer
+    object was started and its reference clock's start.
+
+    This number is usually arbitrary for all clocks except the
+    QElapsedTimer::SystemTime clock. For that clock type, this number is the
+    number of milliseconds since January 1st, 1970 at 0:00 UTC (that is, it
+    is the Unix time expressed in milliseconds).
+
+    \sa clockType(), elapsed()
+*/
+qint64 QElapsedTimer::msecsSinceReference() const
+{
+    return t1;
+}
+
+/*!
+    Returns the number of milliseconds between this QElapsedTimer and \a
+    other. If \a other was started before this object, the returned value
+    will be positive. If it was started later, the returned value will be
+    negative.
+
+    The return value is undefined if this object or \a other were invalidated.
+
+    \sa secsTo(), elapsed()
+*/
+qint64 QElapsedTimer::msecsTo(const QElapsedTimer &other) const
+{
+    qint64 diff = other.t1 - t1;
+    return diff;
+}
+
+/*!
+    Returns the number of seconds between this QElapsedTimer and \a other. If
+    \a other was started before this object, the returned value will be
+    positive. If it was started later, the returned value will be negative.
+
+    The return value is undefined if this object or \a other were invalidated.
+
+    \sa msecsTo(), elapsed()
+*/
+qint64 QElapsedTimer::secsTo(const QElapsedTimer &other) const
+{
+    return msecsTo(other) / 1000;
+}
+
+/*!
+    \relates QElapsedTimer
+
+    Returns true if \a v1 was started before \a v2, false otherwise.
+
+    The returned value is undefined if one of the two parameters is invalid
+    and the other isn't. However, two invalid timers are equal and thus this
+    function will return false.
+*/
+bool operator<(const QElapsedTimer &v1, const QElapsedTimer &v2)
+{
+    return v1.t1 < v2.t1;
+}
+
+QT_END_NAMESPACE
diff --git a/src/corelib/tools/qelapsedtimer_mac.cpp b/src/corelib/tools/qelapsedtimer_mac.cpp
new file mode 100644
index 0000000..8fceb49
--- /dev/null
+++ b/src/corelib/tools/qelapsedtimer_mac.cpp
@@ -0,0 +1,126 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qelapsedtimer.h"
+#include <sys/time.h>
+#include <unistd.h>
+
+#include <mach/mach_time.h>
+
+QT_BEGIN_NAMESPACE
+
+QElapsedTimer::ClockType QElapsedTimer::clockType()
+{
+    return MachAbsoluteTime;
+}
+
+bool QElapsedTimer::isMonotonic()
+{
+    return true;
+}
+
+static mach_timebase_info_data_t info = {0,0};
+static qint64 absoluteToNSecs(qint64 cpuTime)
+{
+    if (info.denom == 0)
+        mach_timebase_info(&info);
+    qint64 nsecs = cpuTime * info.numer / info.denom;
+    return nsecs;
+}
+
+static qint64 absoluteToMSecs(qint64 cpuTime)
+{
+    return absoluteToNSecs(cpuTime) / 1000000;
+}
+
+timeval qt_gettime()
+{
+    timeval tv;
+
+    uint64_t cpu_time = mach_absolute_time();
+    uint64_t nsecs = absoluteToNSecs(cpu_time);
+    tv.tv_sec = nsecs / 1000000000ull;
+    tv.tv_usec = (nsecs / 1000) - (tv.tv_sec * 1000000);
+    return tv;
+}
+
+void QElapsedTimer::start()
+{
+    t1 = mach_absolute_time();
+    t2 = 0;
+}
+
+qint64 QElapsedTimer::restart()
+{
+    qint64 old = t1;
+    t1 = mach_absolute_time();
+    t2 = 0;
+
+    return absoluteToMSecs(t1 - old);
+}
+
+qint64 QElapsedTimer::elapsed() const
+{
+    uint64_t cpu_time = mach_absolute_time();
+    return absoluteToMSecs(cpu_time - t1);
+}
+
+qint64 QElapsedTimer::msecsSinceReference() const
+{
+    return absoluteToMSecs(t1);
+}
+
+qint64 QElapsedTimer::msecsTo(const QElapsedTimer &other) const
+{
+    return absoluteToMSecs(other.t1 - t1);
+}
+
+qint64 QElapsedTimer::secsTo(const QElapsedTimer &other) const
+{
+    return msecsTo(other) / 1000;
+}
+
+bool operator<(const QElapsedTimer &v1, const QElapsedTimer &v2)
+{
+    return v1.t1 < v2.t1;
+}
+
+QT_END_NAMESPACE
diff --git a/src/corelib/tools/qelapsedtimer_symbian.cpp b/src/corelib/tools/qelapsedtimer_symbian.cpp
new file mode 100644
index 0000000..038b102
--- /dev/null
+++ b/src/corelib/tools/qelapsedtimer_symbian.cpp
@@ -0,0 +1,131 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qelapsedtimer.h"
+#include "qpair.h"
+#include <e32std.h>
+#include <sys/time.h>
+#include <hal.h>
+
+QT_BEGIN_NAMESPACE
+
+// return quint64 to avoid sign-extension
+static quint64 getMicrosecondFromTick()
+{
+    static TInt nanokernel_tick_period;
+    if (!nanokernel_tick_period)
+        HAL::Get(HAL::ENanoTickPeriod, nanokernel_tick_period);
+
+    static quint32 highdword = 0;
+    static quint32 lastval = 0;
+    quint32 val = User::NTickCount();
+    if (val < lastval)
+        ++highdword;
+    lastval = val;
+
+    return nanokernel_tick_period * (val | (quint64(highdword) << 32));
+}
+
+static quint64 getMillisecondFromTick()
+{
+    return getMicrosecondFromTick() / 1000;
+}
+
+timeval qt_gettime()
+{
+    timeval tv;
+    quint64 now = getMicrosecondFromTick();
+    tv.tv_sec = now / 1000000;
+    tv.tv_usec = now % 1000000;
+
+    return tv;
+}
+
+QElapsedTimer::ClockType QElapsedTimer::clockType()
+{
+    return TickCounter;
+}
+
+bool QElapsedTimer::isMonotonic()
+{
+    return true;
+}
+
+void QElapsedTimer::start()
+{
+    t1 = getMillisecondFromTick();
+    t2 = 0;
+}
+
+qint64 QElapsedTimer::restart()
+{
+    qint64 oldt1 = t1;
+    t1 = getMillisecondFromTick();
+    t2 = 0;
+    return t1 - oldt1;
+}
+
+qint64 QElapsedTimer::elapsed() const
+{
+    return getMillisecondFromTick() - t1;
+}
+
+qint64 QElapsedTimer::msecsSinceReference() const
+{
+    return t1;
+}
+
+qint64 QElapsedTimer::msecsTo(const QElapsedTimer &other) const
+{
+    return other.t1 - t1;
+}
+
+qint64 QElapsedTimer::secsTo(const QElapsedTimer &other) const
+{
+    return msecsTo(other) / 1000;
+}
+
+bool operator<(const QElapsedTimer &v1, const QElapsedTimer &v2)
+{
+    return (v1.t1 - v2.t1) < 0;
+}
+
+QT_END_NAMESPACE
diff --git a/src/corelib/tools/qelapsedtimer_unix.cpp b/src/corelib/tools/qelapsedtimer_unix.cpp
new file mode 100644
index 0000000..85d7fa8
--- /dev/null
+++ b/src/corelib/tools/qelapsedtimer_unix.cpp
@@ -0,0 +1,179 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qelapsedtimer.h"
+#include "qpair.h"
+#include <sys/time.h>
+#include <time.h>
+#include <unistd.h>
+
+#if !defined(QT_NO_CLOCK_MONOTONIC)
+# if defined(QT_BOOTSTRAPPED)
+#  define QT_NO_CLOCK_MONOTONIC
+# endif
+#endif
+
+QT_BEGIN_NAMESPACE
+
+static qint64 fractionAdjustment()
+{
+    if (QElapsedTimer::isMonotonic()) {
+        // the monotonic timer is measured in nanoseconds
+        // 1 ms = 1000000 ns
+        return 1000*1000ull;
+    } else {
+        // gettimeofday is measured in microseconds
+        // 1 ms = 1000 us
+        return 1000;
+    }
+}
+
+bool QElapsedTimer::isMonotonic()
+{
+#if (_POSIX_MONOTONIC_CLOCK-0 > 0)
+    return true;
+#else
+    static int returnValue = 0;
+
+    if (returnValue == 0) {
+#  if (_POSIX_MONOTONIC_CLOCK-0 < 0)
+        returnValue = -1;
+#  elif (_POSIX_MONOTONIC_CLOCK == 0)
+        // detect if the system support monotonic timers
+        long x = sysconf(_SC_MONOTONIC_CLOCK);
+        returnValue = (x >= 200112L) ? 1 : -1;
+#  endif
+    }
+
+    return returnValue != -1;
+#endif
+}
+
+QElapsedTimer::ClockType QElapsedTimer::clockType()
+{
+    return isMonotonic() ? MonotonicClock : SystemTime;
+}
+
+static inline QPair<long, long> do_gettime()
+{
+#if (_POSIX_MONOTONIC_CLOCK-0 > 0)
+    timespec ts;
+    clock_gettime(CLOCK_MONOTONIC, &ts);
+    return qMakePair(ts.tv_sec, ts.tv_nsec);
+#else
+#  if !defined(QT_NO_CLOCK_MONOTONIC) && !defined(QT_BOOTSTRAPPED)
+    if (QElapsedTimer::isMonotonic()) {
+        timespec ts;
+        clock_gettime(CLOCK_MONOTONIC, &ts);
+        return qMakePair(ts.tv_sec, ts.tv_nsec);
+    }
+#  endif
+    // use gettimeofday
+    timeval tv;
+    ::gettimeofday(&tv, 0);
+    return qMakePair(tv.tv_sec, tv.tv_usec);
+#endif
+}
+
+// used in qcore_unix.cpp and qeventdispatcher_unix.cpp
+timeval qt_gettime()
+{
+    QPair<long, long> r = do_gettime();
+
+    timeval tv;
+    tv.tv_sec = r.first;
+    tv.tv_usec = r.second;
+    if (QElapsedTimer::isMonotonic())
+        tv.tv_usec /= 1000;
+
+    return tv;
+}
+
+void QElapsedTimer::start()
+{
+    QPair<long, long> r = do_gettime();
+    t1 = r.first;
+    t2 = r.second;
+}
+
+qint64 QElapsedTimer::restart()
+{
+    QPair<long, long> r = do_gettime();
+    qint64 oldt1 = t1;
+    qint64 oldt2 = t2;
+    t1 = r.first;
+    t2 = r.second;
+
+    r.first -= oldt1;
+    r.second -= oldt2;
+    return r.first * Q_INT64_C(1000) + r.second / fractionAdjustment();
+}
+
+qint64 QElapsedTimer::elapsed() const
+{
+    QElapsedTimer now;
+    now.start();
+    return msecsTo(now);
+}
+
+qint64 QElapsedTimer::msecsSinceReference() const
+{
+    return t1 * Q_INT64_C(1000) + t2 / fractionAdjustment();
+}
+
+qint64 QElapsedTimer::msecsTo(const QElapsedTimer &other) const
+{
+    qint64 secs = other.t1 - t1;
+    qint64 fraction = other.t2 - t2;
+    return secs * Q_INT64_C(1000) + fraction / fractionAdjustment();
+}
+
+qint64 QElapsedTimer::secsTo(const QElapsedTimer &other) const
+{
+    return other.t1 - t1;
+}
+
+bool operator<(const QElapsedTimer &v1, const QElapsedTimer &v2)
+{
+    return v1.t1 < v2.t1 || (v1.t1 == v2.t1 && v1.t2 < v2.t2);
+}
+
+QT_END_NAMESPACE
diff --git a/src/corelib/tools/qelapsedtimer_win.cpp b/src/corelib/tools/qelapsedtimer_win.cpp
new file mode 100644
index 0000000..135196a
--- /dev/null
+++ b/src/corelib/tools/qelapsedtimer_win.cpp
@@ -0,0 +1,135 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qelapsedtimer.h"
+#include <windows.h>
+
+typedef ULONGLONG (WINAPI *PtrGetTickCount64)(void);
+static PtrGetTickCount64 ptrGetTickCount64 = 0;
+
+QT_BEGIN_NAMESPACE
+
+static void resolveLibs()
+{
+    static bool done = false;
+    if (done)
+        return;
+
+    // try to get GetTickCount64 from the system
+    HMODULE kernel32 = GetModuleHandleW(L"kernel32");
+    if (!kernel32)
+        return;
+
+#if defined(Q_OS_WINCE)
+    // does this function exist on WinCE, or will ever exist?
+    ptrGetTickCount64 = (PtrGetTickCount64)GetProcAddress(kernel32, L"GetTickCount64");
+#else
+    ptrGetTickCount64 = (PtrGetTickCount64)GetProcAddress(kernel32, "GetTickCount64");
+#endif
+
+    done = true;
+}
+
+static quint64 getTickCount()
+{
+    resolveLibs();
+    if (ptrGetTickCount64)
+        return ptrGetTickCount64();
+
+    static quint32 highdword = 0;
+    static quint32 lastval = 0;
+    quint32 val = GetTickCount();
+    if (val < lastval)
+        ++highdword;
+    lastval = val;
+    return val | (quint64(highdword) << 32);
+}
+
+QElapsedTimer::ClockType QElapsedTimer::clockType()
+{
+    return TickCounter;
+}
+
+bool QElapsedTimer::isMonotonic()
+{
+    return true;
+}
+
+void QElapsedTimer::start()
+{
+    t1 = getTickCount();
+    t2 = 0;
+}
+
+qint64 QElapsedTimer::restart()
+{
+    qint64 oldt1 = t1;
+    t1 = getTickCount();
+    t2 = 0;
+    return t1 - oldt1;
+}
+
+qint64 QElapsedTimer::elapsed() const
+{
+    return getTickCount() - t1;
+}
+
+qint64 QElapsedTimer::msecsSinceReference() const
+{
+    return t1;
+}
+
+qint64 QElapsedTimer::msecsTo(const QElapsedTimer &other) const
+{
+    return other.t1 - t1;
+}
+
+qint64 QElapsedTimer::secsTo(const QElapsedTimer &other) const
+{
+    return msecsTo(other) / 1000;
+}
+
+bool operator<(const QElapsedTimer &v1, const QElapsedTimer &v2)
+{
+    return (v1.t1 - v2.t1) < 0;
+}
+
+QT_END_NAMESPACE
diff --git a/src/corelib/tools/qlocale.cpp b/src/corelib/tools/qlocale.cpp
index 1966a79..e36497c 100644
--- a/src/corelib/tools/qlocale.cpp
+++ b/src/corelib/tools/qlocale.cpp
@@ -1274,11 +1274,25 @@ QLocale QSystemLocale::fallbackLocale() const
 */
 QVariant QSystemLocale::query(QueryType type, QVariant /* in */) const
 {
-    if (type == MeasurementSystem) {
+    switch (type) {
+    case MeasurementSystem:
         return QVariant(unixGetSystemMeasurementSystem());
-    } else {
-        return QVariant();
+    case LanguageId:
+    case CountryId: {
+        QString locale = QLatin1String(envVarLocale());
+        QLocale::Language lang;
+        QLocale::Country cntry;
+        getLangAndCountry(locale, lang, cntry);
+        if (type == LanguageId)
+            return lang;
+        if (cntry == QLocale::AnyCountry)
+            return fallbackLocale().country();
+        return cntry;
+    }
+    default:
+        break;
     }
+    return QVariant();
 }
 
 #elif !defined(Q_OS_SYMBIAN)
@@ -1310,12 +1324,10 @@ QVariant QSystemLocale::query(QueryType /* type */, QVariant /* in */) const
 
 #endif
 
-#ifndef QT_NO_SYSTEMLOCALE
 static QSystemLocale *_systemLocale = 0;
 Q_GLOBAL_STATIC_WITH_ARGS(QSystemLocale, QSystemLocale_globalSystemLocale, (true))
 static QLocalePrivate *system_lp = 0;
 Q_GLOBAL_STATIC(QLocalePrivate, globalLocalePrivate)
-#endif
 
 /******************************************************************************
 ** Default system locale behavior
@@ -1388,7 +1400,8 @@ QSystemLocale::QSystemLocale()
 
 /*! \internal */
 QSystemLocale::QSystemLocale(bool)
-{ }
+{
+}
 
 /*!
   Deletes the object.
@@ -1410,16 +1423,42 @@ static const QSystemLocale *systemLocale()
     return QSystemLocale_globalSystemLocale();
 }
 
+static const QLocalePrivate *maybeSystemPrivate();
+bool QLocalePrivate::isUninitializedSystemLocale() const
+{
+    return this == maybeSystemPrivate() && m_language_id == 0;
+}
+
+QVariant QLocalePrivate::querySystemLocale(int type, const QVariant &in) const
+{
+    QVariant res = systemLocale()->query(QSystemLocale::QueryType(type), in);
+    if (res.isNull() && isUninitializedSystemLocale()) {
+        // if we were not able to get data from the system, initialize the
+        // system locale private data (which is essentially equals to this)
+        // with a fallback locale.
+        QLocalePrivate *system_private = globalLocalePrivate();
+        *system_private = *systemLocale()->fallbackLocale().d();
+        // internal cache is not initialized with values from the system, mark
+        // it as not fully initialized system locale.
+        system_private->m_language_id = 0;
+    }
+    return res;
+}
+
+// retrieves data from the system locale and caches them locally.
 void QLocalePrivate::updateSystemPrivate()
 {
     const QSystemLocale *sys_locale = systemLocale();
     if (!system_lp)
-        system_lp = globalLocalePrivate();
+        return;
+
+    // copy over the information from the fallback locale and modify
     *system_lp = *sys_locale->fallbackLocale().d();
 
     QVariant res = sys_locale->query(QSystemLocale::LanguageId, QVariant());
     if (!res.isNull())
         system_lp->m_language_id = res.toInt();
+
     res = sys_locale->query(QSystemLocale::CountryId, QVariant());
     if (!res.isNull())
         system_lp->m_country_id = res.toInt();
@@ -1446,19 +1485,29 @@ void QLocalePrivate::updateSystemPrivate()
 }
 #endif
 
+// returns the private data for the system locale. Cached data will not be
+// initialized until the updateSystemPrivate is called.
 static const QLocalePrivate *systemPrivate()
 {
 #ifndef QT_NO_SYSTEMLOCALE
-    // copy over the information from the fallback locale and modify
-    if (!system_lp || system_lp->m_language_id == 0)
-        QLocalePrivate::updateSystemPrivate();
-
+    if (!system_lp) {
+        system_lp = globalLocalePrivate();
+        // mark the locale as uninitialized system locale
+        system_lp->m_language_id = 0;
+    }
     return system_lp;
 #else
     return locale_data;
 #endif
 }
 
+#ifndef QT_NO_SYSTEMLOCALE
+static const QLocalePrivate *maybeSystemPrivate()
+{
+    return system_lp;
+}
+#endif
+
 static const QLocalePrivate *defaultPrivate()
 {
     if (!default_lp)
@@ -2283,7 +2332,12 @@ void QLocale::setDefault(const QLocale &locale)
 */
 QLocale::Language QLocale::language() const
 {
-    return Language(d()->languageId());
+    const QLocalePrivate *dd = d();
+#ifndef QT_NO_SYSTEMLOCALE
+    if (dd->isUninitializedSystemLocale())
+        QLocalePrivate::updateSystemPrivate();
+#endif
+    return Language(dd->languageId());
 }
 
 /*!
@@ -2293,7 +2347,12 @@ QLocale::Language QLocale::language() const
 */
 QLocale::Country QLocale::country() const
 {
-    return Country(d()->countryId());
+    const QLocalePrivate *dd = d();
+#ifndef QT_NO_SYSTEMLOCALE
+    if (dd->isUninitializedSystemLocale())
+        QLocalePrivate::updateSystemPrivate();
+#endif
+    return Country(dd->countryId());
 }
 
 /*!
@@ -2631,8 +2690,8 @@ QString QLocale::toString(const QDate &date, FormatType format) const
         return QString();
 
 #ifndef QT_NO_SYSTEMLOCALE
-    if (d() == systemPrivate()) {
-        QVariant res = systemLocale()->query(format == LongFormat
+    if (d() == maybeSystemPrivate()) {
+        QVariant res = d()->querySystemLocale(format == LongFormat
                                              ? QSystemLocale::DateToStringLong : QSystemLocale::DateToStringShort,
                                              date);
         if (!res.isNull())
@@ -2726,8 +2785,8 @@ QString QLocale::toString(const QDateTime &dateTime, FormatType format) const
         return QString();
 
 #ifndef QT_NO_SYSTEMLOCALE
-    if (d() == systemPrivate()) {
-        QVariant res = systemLocale()->query(format == LongFormat
+    if (d() == maybeSystemPrivate()) {
+        QVariant res = d()->querySystemLocale(format == LongFormat
                                              ? QSystemLocale::DateTimeToStringLong
                                              : QSystemLocale::DateTimeToStringShort,
                                              dateTime);
@@ -2752,8 +2811,8 @@ QString QLocale::toString(const QTime &time, FormatType format) const
         return QString();
 
 #ifndef QT_NO_SYSTEMLOCALE
-    if (d() == systemPrivate()) {
-        QVariant res = systemLocale()->query(format == LongFormat
+    if (d() == maybeSystemPrivate()) {
+        QVariant res = d()->querySystemLocale(format == LongFormat
                                              ? QSystemLocale::TimeToStringLong : QSystemLocale::TimeToStringShort,
                                              time);
         if (!res.isNull())
@@ -2779,8 +2838,8 @@ QString QLocale::toString(const QTime &time, FormatType format) const
 QString QLocale::dateFormat(FormatType format) const
 {
 #ifndef QT_NO_SYSTEMLOCALE
-    if (d() == systemPrivate()) {
-        QVariant res = systemLocale()->query(format == LongFormat
+    if (d() == maybeSystemPrivate()) {
+        QVariant res = d()->querySystemLocale(format == LongFormat
                                              ? QSystemLocale::DateFormatLong : QSystemLocale::DateFormatShort,
                                              QVariant());
         if (!res.isNull())
@@ -2816,8 +2875,8 @@ QString QLocale::dateFormat(FormatType format) const
 QString QLocale::timeFormat(FormatType format) const
 {
 #ifndef QT_NO_SYSTEMLOCALE
-    if (d() == systemPrivate()) {
-        QVariant res = systemLocale()->query(format == LongFormat
+    if (d() == maybeSystemPrivate()) {
+        QVariant res = d()->querySystemLocale(format == LongFormat
                                              ? QSystemLocale::TimeFormatLong : QSystemLocale::TimeFormatShort,
                                              QVariant());
         if (!res.isNull())
@@ -2853,8 +2912,8 @@ QString QLocale::timeFormat(FormatType format) const
 QString QLocale::dateTimeFormat(FormatType format) const
 {
 #ifndef QT_NO_SYSTEMLOCALE
-    if (d() == systemPrivate()) {
-        QVariant res = systemLocale()->query(format == LongFormat
+    if (d() == maybeSystemPrivate()) {
+        QVariant res = d()->querySystemLocale(format == LongFormat
                                              ? QSystemLocale::DateTimeFormatLong
                                              : QSystemLocale::DateTimeFormatShort,
                                              QVariant());
@@ -3021,7 +3080,12 @@ QDateTime QLocale::toDateTime(const QString &string, const QString &format) cons
 */
 QChar QLocale::decimalPoint() const
 {
-    return d()->decimal();
+    const QLocalePrivate *dd = d();
+#ifndef QT_NO_SYSTEMLOCALE
+    if (dd->isUninitializedSystemLocale())
+        QLocalePrivate::updateSystemPrivate();
+#endif
+    return dd->decimal();
 }
 
 /*!
@@ -3031,7 +3095,12 @@ QChar QLocale::decimalPoint() const
 */
 QChar QLocale::groupSeparator() const
 {
-    return d()->group();
+    const QLocalePrivate *dd = d();
+#ifndef QT_NO_SYSTEMLOCALE
+    if (dd->isUninitializedSystemLocale())
+        QLocalePrivate::updateSystemPrivate();
+#endif
+    return dd->group();
 }
 
 /*!
@@ -3041,7 +3110,12 @@ QChar QLocale::groupSeparator() const
 */
 QChar QLocale::percent() const
 {
-    return d()->percent();
+    const QLocalePrivate *dd = d();
+#ifndef QT_NO_SYSTEMLOCALE
+    if (dd->isUninitializedSystemLocale())
+        QLocalePrivate::updateSystemPrivate();
+#endif
+    return dd->percent();
 }
 
 /*!
@@ -3051,7 +3125,12 @@ QChar QLocale::percent() const
 */
 QChar QLocale::zeroDigit() const
 {
-    return d()->zero();
+    const QLocalePrivate *dd = d();
+#ifndef QT_NO_SYSTEMLOCALE
+    if (dd->isUninitializedSystemLocale())
+        QLocalePrivate::updateSystemPrivate();
+#endif
+    return dd->zero();
 }
 
 /*!
@@ -3061,7 +3140,12 @@ QChar QLocale::zeroDigit() const
 */
 QChar QLocale::negativeSign() const
 {
-    return d()->minus();
+    const QLocalePrivate *dd = d();
+#ifndef QT_NO_SYSTEMLOCALE
+    if (dd->isUninitializedSystemLocale())
+        QLocalePrivate::updateSystemPrivate();
+#endif
+    return dd->minus();
 }
 
 /*!
@@ -3071,7 +3155,12 @@ QChar QLocale::negativeSign() const
 */
 QChar QLocale::positiveSign() const
 {
-    return d()->plus();
+    const QLocalePrivate *dd = d();
+#ifndef QT_NO_SYSTEMLOCALE
+    if (dd->isUninitializedSystemLocale())
+        QLocalePrivate::updateSystemPrivate();
+#endif
+    return dd->plus();
 }
 
 /*!
@@ -3081,7 +3170,12 @@ QChar QLocale::positiveSign() const
 */
 QChar QLocale::exponential() const
 {
-    return d()->exponential();
+    const QLocalePrivate *dd = d();
+#ifndef QT_NO_SYSTEMLOCALE
+    if (dd->isUninitializedSystemLocale())
+        QLocalePrivate::updateSystemPrivate();
+#endif
+    return dd->exponential();
 }
 
 static bool qIsUpper(char c)
@@ -3200,8 +3294,8 @@ QString QLocale::monthName(int month, FormatType type) const
         return QString();
 
 #ifndef QT_NO_SYSTEMLOCALE
-    if (d() == systemPrivate()) {
-        QVariant res = systemLocale()->query(type == LongFormat
+    if (d() == maybeSystemPrivate()) {
+        QVariant res = d()->querySystemLocale(type == LongFormat
                                              ? QSystemLocale::MonthNameLong : QSystemLocale::MonthNameShort,
                                              month);
         if (!res.isNull())
@@ -3246,8 +3340,8 @@ QString QLocale::standaloneMonthName(int month, FormatType type) const
         return QString();
 
 #ifndef QT_NO_SYSTEMLOCALE
-    if (d() == systemPrivate()) {
-        QVariant res = systemLocale()->query(type == LongFormat
+    if (d() == maybeSystemPrivate()) {
+        QVariant res = d()->querySystemLocale(type == LongFormat
                                              ? QSystemLocale::MonthNameLong : QSystemLocale::MonthNameShort,
                                              month);
         if (!res.isNull())
@@ -3293,8 +3387,8 @@ QString QLocale::dayName(int day, FormatType type) const
         return QString();
 
 #ifndef QT_NO_SYSTEMLOCALE
-    if (d() == systemPrivate()) {
-        QVariant res = systemLocale()->query(type == LongFormat
+    if (d() == maybeSystemPrivate()) {
+        QVariant res = d()->querySystemLocale(type == LongFormat
                                              ? QSystemLocale::DayNameLong : QSystemLocale::DayNameShort,
                                              day);
         if (!res.isNull())
@@ -3342,8 +3436,8 @@ QString QLocale::standaloneDayName(int day, FormatType type) const
         return QString();
 
 #ifndef QT_NO_SYSTEMLOCALE
-    if (d() == systemPrivate()) {
-        QVariant res = systemLocale()->query(type == LongFormat
+    if (d() == maybeSystemPrivate()) {
+        QVariant res = d()->querySystemLocale(type == LongFormat
                                              ? QSystemLocale::DayNameLong : QSystemLocale::DayNameShort,
                                              day);
         if (!res.isNull())
@@ -3387,8 +3481,8 @@ QLocale::MeasurementSystem QLocale::measurementSystem() const
     bool found = false;
 
 #ifndef QT_NO_SYSTEMLOCALE
-    if (d() == systemPrivate()) {
-        QVariant res = systemLocale()->query(QSystemLocale::MeasurementSystem, QVariant());
+    if (d() == maybeSystemPrivate()) {
+        QVariant res = d()->querySystemLocale(QSystemLocale::MeasurementSystem, QVariant());
         if (!res.isNull()) {
             meas = MeasurementSystem(res.toInt());
             found = true;
@@ -3415,8 +3509,8 @@ QLocale::MeasurementSystem QLocale::measurementSystem() const
 QString QLocale::amText() const
 {
 #ifndef QT_NO_SYSTEMLOCALE
-    if (d() == systemPrivate()) {
-        QVariant res = systemLocale()->query(QSystemLocale::AMText, QVariant());
+    if (d() == maybeSystemPrivate()) {
+        QVariant res = d()->querySystemLocale(QSystemLocale::AMText, QVariant());
         if (!res.isNull())
             return res.toString();
     }
@@ -3435,8 +3529,8 @@ QString QLocale::amText() const
 QString QLocale::pmText() const
 {
 #ifndef QT_NO_SYSTEMLOCALE
-    if (d() == systemPrivate()) {
-        QVariant res = systemLocale()->query(QSystemLocale::PMText, QVariant());
+    if (d() == maybeSystemPrivate()) {
+        QVariant res = d()->querySystemLocale(QSystemLocale::PMText, QVariant());
         if (!res.isNull())
             return res.toString();
     }
@@ -3851,6 +3945,10 @@ QString QLocalePrivate::doubleToString(double d,
                                        int width,
                                        unsigned flags) const
 {
+#ifndef QT_NO_SYSTEMLOCALE
+    if (isUninitializedSystemLocale())
+        QLocalePrivate::updateSystemPrivate();
+#endif
     if (precision == -1)
         precision = 6;
     if (width == -1)
@@ -4001,6 +4099,10 @@ QString QLocalePrivate::longLongToString(qlonglong l, int precision,
                                             int base, int width,
                                             unsigned flags) const
 {
+#ifndef QT_NO_SYSTEMLOCALE
+    if (isUninitializedSystemLocale())
+        QLocalePrivate::updateSystemPrivate();
+#endif
     bool precision_not_specified = false;
     if (precision == -1) {
         precision_not_specified = true;
@@ -4086,6 +4188,10 @@ QString QLocalePrivate::unsLongLongToString(qulonglong l, int precision,
                                             int base, int width,
                                             unsigned flags) const
 {
+#ifndef QT_NO_SYSTEMLOCALE
+    if (isUninitializedSystemLocale())
+        QLocalePrivate::updateSystemPrivate();
+#endif
     bool precision_not_specified = false;
     if (precision == -1) {
         precision_not_specified = true;
@@ -4288,6 +4394,10 @@ bool QLocalePrivate::numberToCLocale(const QString &num,
 bool QLocalePrivate::validateChars(const QString &str, NumberMode numMode, QByteArray *buff,
                                     int decDigits) const
 {
+#ifndef QT_NO_SYSTEMLOCALE
+    if (isUninitializedSystemLocale())
+        QLocalePrivate::updateSystemPrivate();
+#endif
     buff->clear();
     buff->reserve(str.length());
 
@@ -4381,6 +4491,10 @@ bool QLocalePrivate::validateChars(const QString &str, NumberMode numMode, QByte
 double QLocalePrivate::stringToDouble(const QString &number, bool *ok,
                                         GroupSeparatorMode group_sep_mode) const
 {
+#ifndef QT_NO_SYSTEMLOCALE
+    if (isUninitializedSystemLocale())
+        QLocalePrivate::updateSystemPrivate();
+#endif
     CharBuff buff;
     if (!numberToCLocale(group().unicode() == 0xa0 ? number.trimmed() : number,
                          group_sep_mode, &buff)) {
@@ -4394,6 +4508,10 @@ double QLocalePrivate::stringToDouble(const QString &number, bool *ok,
 qlonglong QLocalePrivate::stringToLongLong(const QString &number, int base,
                                            bool *ok, GroupSeparatorMode group_sep_mode) const
 {
+#ifndef QT_NO_SYSTEMLOCALE
+    if (isUninitializedSystemLocale())
+        QLocalePrivate::updateSystemPrivate();
+#endif
     CharBuff buff;
     if (!numberToCLocale(group().unicode() == 0xa0 ? number.trimmed() : number,
                          group_sep_mode, &buff)) {
@@ -4408,6 +4526,10 @@ qlonglong QLocalePrivate::stringToLongLong(const QString &number, int base,
 qulonglong QLocalePrivate::stringToUnsLongLong(const QString &number, int base,
                                                bool *ok, GroupSeparatorMode group_sep_mode) const
 {
+#ifndef QT_NO_SYSTEMLOCALE
+    if (isUninitializedSystemLocale())
+        QLocalePrivate::updateSystemPrivate();
+#endif
     CharBuff buff;
     if (!numberToCLocale(group().unicode() == 0xa0 ? number.trimmed() : number,
                          group_sep_mode, &buff)) {
diff --git a/src/corelib/tools/qlocale.h b/src/corelib/tools/qlocale.h
index e854c84..9b7b214 100644
--- a/src/corelib/tools/qlocale.h
+++ b/src/corelib/tools/qlocale.h
@@ -638,6 +638,7 @@ public:
         ;
 private:
     friend struct QLocalePrivate;
+
     // ### We now use this field to pack an index into locale_data and NumberOptions.
     // ### Qt 5: change to a QLocaleData *d; uint numberOptions.
     union {
diff --git a/src/corelib/tools/qlocale_p.h b/src/corelib/tools/qlocale_p.h
index ecf79e9..003ae8c 100644
--- a/src/corelib/tools/qlocale_p.h
+++ b/src/corelib/tools/qlocale_p.h
@@ -63,14 +63,14 @@ QT_BEGIN_NAMESPACE
 struct Q_CORE_EXPORT QLocalePrivate
 {
 public:
-    QChar decimal() const { return QChar(m_decimal); }
-    QChar group() const { return QChar(m_group); }
-    QChar list() const { return QChar(m_list); }
-    QChar percent() const { return QChar(m_percent); }
-    QChar zero() const { return QChar(m_zero); }
-    QChar plus() const { return QChar(m_plus); }
-    QChar minus() const { return QChar(m_minus); }
-    QChar exponential() const { return QChar(m_exponential); }
+    QChar decimal() const { Q_ASSERT(m_decimal); return QChar(m_decimal); }
+    QChar group() const { Q_ASSERT(m_group); return QChar(m_group); }
+    QChar list() const { Q_ASSERT(m_list); return QChar(m_list); }
+    QChar percent() const { Q_ASSERT(m_percent); return QChar(m_percent); }
+    QChar zero() const { Q_ASSERT(m_zero); return QChar(m_zero); }
+    QChar plus() const { Q_ASSERT(m_plus); return QChar(m_plus); }
+    QChar minus() const { Q_ASSERT(m_minus); return QChar(m_minus); }
+    QChar exponential() const { Q_ASSERT(m_exponential); return QChar(m_exponential); }
 
     quint32 languageId() const { return m_language_id; }
     quint32 countryId() const { return m_country_id; }
@@ -132,6 +132,8 @@ public:
                           CharBuff *result) const;
     inline char digitToCLocale(const QChar &c) const;
 
+    inline bool isUninitializedSystemLocale() const;
+    QVariant querySystemLocale(int type, const QVariant &in) const;
     static void updateSystemPrivate();
 
     enum NumberMode { IntegerMode, DoubleStandardMode, DoubleScientificMode };
diff --git a/src/corelib/tools/qtimeline.cpp b/src/corelib/tools/qtimeline.cpp
index 877a77a..f413223 100644
--- a/src/corelib/tools/qtimeline.cpp
+++ b/src/corelib/tools/qtimeline.cpp
@@ -42,9 +42,9 @@
 #include "qtimeline.h"
 
 #include <private/qobject_p.h>
-#include <QtCore/qdatetime.h>
 #include <QtCore/qcoreevent.h>
 #include <QtCore/qmath.h>
+#include <QtCore/qelapsedtimer.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -70,7 +70,7 @@ public:
 
     int currentTime;
     int timerId;
-    QTime timer;
+    QElapsedTimer timer;
 
     QTimeLine::Direction direction;
     QEasingCurve easingCurve;
diff --git a/src/corelib/tools/tools.pri b/src/corelib/tools/tools.pri
index 6d64915..4e0ebbc 100644
--- a/src/corelib/tools/tools.pri
+++ b/src/corelib/tools/tools.pri
@@ -42,6 +42,7 @@ HEADERS +=  \
         tools/qstringmatcher.h \
         tools/qtextboundaryfinder.h \
         tools/qtimeline.h \
+        tools/qelapsedtimer.h \
         tools/qunicodetables_p.h \
         tools/qvarlengtharray.h \
         tools/qvector.h \
@@ -56,6 +57,7 @@ SOURCES += \
         tools/qcryptographichash.cpp \
         tools/qdatetime.cpp \
         tools/qeasingcurve.cpp \
+        tools/qelapsedtimer.cpp \
         tools/qhash.cpp \
         tools/qline.cpp \
         tools/qlinkedlist.cpp \
@@ -81,6 +83,12 @@ SOURCES += \
 
 symbian:SOURCES+=tools/qlocale_symbian.cpp
 
+mac:SOURCES += tools/qelapsedtimer_mac.cpp
+else:symbian:SOURCES += tools/qelapsedtimer_symbian.cpp
+else:unix:SOURCES += tools/qelapsedtimer_unix.cpp
+else:win32:SOURCES += tools/qelapsedtimer_win.cpp
+else:SOURCES += tools/qelapsedtimer_generic.cpp
+
 #zlib support
 contains(QT_CONFIG, zlib) {
    wince*: DEFINES += NO_ERRNO_H
diff --git a/src/gui/dialogs/qfileinfogatherer.cpp b/src/gui/dialogs/qfileinfogatherer.cpp
index 3b08bf6..3b279ae 100644
--- a/src/gui/dialogs/qfileinfogatherer.cpp
+++ b/src/gui/dialogs/qfileinfogatherer.cpp
@@ -297,7 +297,8 @@ void QFileInfoGatherer::getFileInfos(const QString &path, const QStringList &fil
         return;
     }
 
-    QTime base = QTime::currentTime();
+    QElapsedTimer base;
+    base.start();
     QFileInfo fileInfo;
     bool firstTime = true;
     QList<QPair<QString, QFileInfo> > updatedFiles;
@@ -326,9 +327,10 @@ void QFileInfoGatherer::getFileInfos(const QString &path, const QStringList &fil
     emit directoryLoaded(path);
 }
 
-void QFileInfoGatherer::fetch(const QFileInfo &fileInfo, QTime &base, bool &firstTime, QList<QPair<QString, QFileInfo> > &updatedFiles, const QString &path) {
+void QFileInfoGatherer::fetch(const QFileInfo &fileInfo, QElapsedTimer &base, bool &firstTime, QList<QPair<QString, QFileInfo> > &updatedFiles, const QString &path) {
     updatedFiles.append(QPair<QString, QFileInfo>(fileInfo.fileName(), fileInfo));
-    QTime current = QTime::currentTime();
+    QElapsedTimer current;
+    current.start();
     if ((firstTime && updatedFiles.count() > 100) || base.msecsTo(current) > 1000) {
         emit updates(path, updatedFiles);
         updatedFiles.clear();
diff --git a/src/gui/dialogs/qfileinfogatherer_p.h b/src/gui/dialogs/qfileinfogatherer_p.h
index eff6b3c..5abcd94 100644
--- a/src/gui/dialogs/qfileinfogatherer_p.h
+++ b/src/gui/dialogs/qfileinfogatherer_p.h
@@ -60,9 +60,10 @@
 #include <qfileiconprovider.h>
 #include <qfsfileengine.h>
 #include <qpair.h>
-#include <qdatetime.h>
 #include <qstack.h>
+#include <qdatetime.h>
 #include <qdir.h>
+#include <qelapsedtimer.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -174,7 +175,7 @@ protected:
     void getFileInfos(const QString &path, const QStringList &files);
 
 private:
-    void fetch(const QFileInfo &info, QTime &base, bool &firstTime, QList<QPair<QString, QFileInfo> > &updatedFiles, const QString &path);
+    void fetch(const QFileInfo &info, QElapsedTimer &base, bool &firstTime, QList<QPair<QString, QFileInfo> > &updatedFiles, const QString &path);
     QString translateDriveName(const QFileInfo &drive) const;
 
     QMutex mutex;
diff --git a/src/gui/dialogs/qprogressdialog.cpp b/src/gui/dialogs/qprogressdialog.cpp
index 4fffdba..a2d7b23 100644
--- a/src/gui/dialogs/qprogressdialog.cpp
+++ b/src/gui/dialogs/qprogressdialog.cpp
@@ -46,7 +46,6 @@
 #include "qshortcut.h"
 #include "qpainter.h"
 #include "qdrawutil.h"
-#include "qdatetime.h"
 #include "qlabel.h"
 #include "qprogressbar.h"
 #include "qapplication.h"
@@ -54,6 +53,7 @@
 #include "qpushbutton.h"
 #include "qcursor.h"
 #include "qtimer.h"
+#include "qelapsedtimer.h"
 #include <private/qdialog_p.h>
 #include <limits.h>
 
@@ -103,7 +103,7 @@ public:
     QTimer *forceTimer;
     bool shown_once;
     bool cancellation_flag;
-    QTime starttime;
+    QElapsedTimer starttime;
 #ifndef QT_NO_CURSOR
     QCursor parentCursor;
 #endif
diff --git a/src/gui/itemviews/qabstractitemview.cpp b/src/gui/itemviews/qabstractitemview.cpp
index dd9a7e6..fc53ea3 100644
--- a/src/gui/itemviews/qabstractitemview.cpp
+++ b/src/gui/itemviews/qabstractitemview.cpp
@@ -104,7 +104,8 @@ QAbstractItemViewPrivate::QAbstractItemViewPrivate()
         horizontalScrollMode(QAbstractItemView::ScrollPerItem),
         currentIndexSet(false),
         wrapItemText(false),
-        delayedPendingLayout(false)
+        delayedPendingLayout(false),
+        moveCursorUpdatedView(false)
 {
 }
 
@@ -2210,6 +2211,7 @@ void QAbstractItemView::keyPressEvent(QKeyEvent *event)
 #endif
 
     QPersistentModelIndex newCurrent;
+    d->moveCursorUpdatedView = false;
     switch (event->key()) {
     case Qt::Key_Down:
         newCurrent = moveCursor(MoveDown, event->modifiers());
@@ -2266,6 +2268,7 @@ void QAbstractItemView::keyPressEvent(QKeyEvent *event)
                 QRect rect(d->pressedPosition - d->offset(), QSize(1, 1));
                 setSelection(rect, command);
             }
+            event->accept();
             return;
         }
     }
@@ -2363,6 +2366,8 @@ void QAbstractItemView::keyPressEvent(QKeyEvent *event)
         }
         break; }
     }
+    if (d->moveCursorUpdatedView)
+        event->accept();
 }
 
 /*!
@@ -2839,7 +2844,8 @@ void QAbstractItemView::keyboardSearch(const QString &search)
 
     QModelIndex start = currentIndex().isValid() ? currentIndex()
                         : d->model->index(0, 0, d->root);
-    QTime now(QTime::currentTime());
+    QElapsedTimer now;
+    now.start();
     bool skipRow = false;
     if (search.isEmpty()
         || (d->keyboardInputTime.msecsTo(now) > QApplication::keyboardInputInterval())) {
diff --git a/src/gui/itemviews/qabstractitemview_p.h b/src/gui/itemviews/qabstractitemview_p.h
index 82fd1a6..fce74f3 100644
--- a/src/gui/itemviews/qabstractitemview_p.h
+++ b/src/gui/itemviews/qabstractitemview_p.h
@@ -56,7 +56,6 @@
 #include "private/qabstractscrollarea_p.h"
 #include "private/qabstractitemmodel_p.h"
 #include "QtGui/qapplication.h"
-#include "QtCore/qdatetime.h"
 #include "QtGui/qevent.h"
 #include "QtGui/qmime.h"
 #include "QtGui/qpainter.h"
@@ -65,6 +64,7 @@
 #include "QtCore/qdebug.h"
 #include "QtGui/qpainter.h"
 #include "QtCore/qbasictimer.h"
+#include "QtCore/qelapsedtimer.h"
 
 #ifndef QT_NO_ITEMVIEWS
 
@@ -390,7 +390,7 @@ public:
 #endif
 
     QString keyboardInput;
-    QTime keyboardInputTime;
+    QElapsedTimer keyboardInputTime;
 
     bool autoScroll;
     QBasicTimer autoScrollTimer;
@@ -419,6 +419,7 @@ public:
 
     bool wrapItemText;
     mutable bool delayedPendingLayout;
+    bool moveCursorUpdatedView;
 
 private:
     mutable QBasicTimer delayedLayout;
diff --git a/src/gui/itemviews/qtreeview.cpp b/src/gui/itemviews/qtreeview.cpp
index ada3936..b9d51a2 100644
--- a/src/gui/itemviews/qtreeview.cpp
+++ b/src/gui/itemviews/qtreeview.cpp
@@ -958,7 +958,8 @@ void QTreeView::keyboardSearch(const QString &search)
     else
         start = d->model->index(0, 0, d->root);
 
-    QTime now(QTime::currentTime());
+    QElapsedTimer now;
+    now.start();
     bool skipRow = false;
     if (search.isEmpty()
         || (d->keyboardInputTime.msecsTo(now) > QApplication::keyboardInputInterval())) {
@@ -2156,9 +2157,10 @@ QModelIndex QTreeView::moveCursor(CursorAction cursorAction, Qt::KeyboardModifie
         return d->modelIndex(d->above(vi), current.column());
     case MoveLeft: {
         QScrollBar *sb = horizontalScrollBar();
-        if (vi < d->viewItems.count() && d->viewItems.at(vi).expanded && d->itemsExpandable && sb->value() == sb->minimum())
+        if (vi < d->viewItems.count() && d->viewItems.at(vi).expanded && d->itemsExpandable && sb->value() == sb->minimum()) {
             d->collapse(vi, true);
-        else {
+            d->moveCursorUpdatedView = true;
+        } else {
             bool descend = style()->styleHint(QStyle::SH_ItemView_ArrowKeysNavigateIntoChildren, 0, this);
             if (descend) {
                 QModelIndex par = current.parent();
@@ -2178,7 +2180,10 @@ QModelIndex QTreeView::moveCursor(CursorAction cursorAction, Qt::KeyboardModifie
                         return next;
                 }
 
+                int oldValue = sb->value();
                 sb->setValue(sb->value() - sb->singleStep());
+                if (oldValue != sb->value())
+                    d->moveCursorUpdatedView = true;
             }
 
         }
@@ -2190,6 +2195,7 @@ QModelIndex QTreeView::moveCursor(CursorAction cursorAction, Qt::KeyboardModifie
         if (vi < d->viewItems.count() && !d->viewItems.at(vi).expanded && d->itemsExpandable
             && d->hasVisibleChildren(d->viewItems.at(vi).index)) {
             d->expand(vi, true);
+            d->moveCursorUpdatedView = true;
         } else {
             bool descend = style()->styleHint(QStyle::SH_ItemView_ArrowKeysNavigateIntoChildren, 0, this);
             if (descend) {
@@ -2212,7 +2218,10 @@ QModelIndex QTreeView::moveCursor(CursorAction cursorAction, Qt::KeyboardModifie
 
                 //last restort: we change the scrollbar value
                 QScrollBar *sb = horizontalScrollBar();
+                int oldValue = sb->value();
                 sb->setValue(sb->value() + sb->singleStep());
+                if (oldValue != sb->value())
+                    d->moveCursorUpdatedView = true;
             }
         }
         updateGeometries();
diff --git a/src/gui/kernel/qclipboard_x11.cpp b/src/gui/kernel/qclipboard_x11.cpp
index 047bd09..3bdc971 100644
--- a/src/gui/kernel/qclipboard_x11.cpp
+++ b/src/gui/kernel/qclipboard_x11.cpp
@@ -65,7 +65,6 @@
 #include "qapplication.h"
 #include "qdesktopwidget.h"
 #include "qbitmap.h"
-#include "qdatetime.h"
 #include "qiodevice.h"
 #include "qbuffer.h"
 #include "qtextcodec.h"
@@ -76,6 +75,7 @@
 #include "qt_x11_p.h"
 #include "qx11info_x11.h"
 #include "qimagewriter.h"
+#include "qelapsedtimer.h"
 #include "qvariant.h"
 #include "qdnd_p.h"
 #include <private/qwidget_p.h>
@@ -516,8 +516,9 @@ static Bool checkForClipboardEvents(Display *, XEvent *e, XPointer)
 
 bool QX11Data::clipboardWaitForEvent(Window win, int type, XEvent *event, int timeout)
 {
-    QTime started = QTime::currentTime();
-    QTime now = started;
+    QElapsedTimer started;
+    started.start();
+    QElapsedTimer now = started;
 
     if (QAbstractEventDispatcher::instance()->inherits("QtMotif")
         || QApplication::clipboard()->property("useEventLoopWhenWaiting").toBool()) {
@@ -545,9 +546,7 @@ bool QX11Data::clipboardWaitForEvent(Window win, int type, XEvent *event, int ti
             XSync(X11->display, false);
             usleep(50000);
 
-            now = QTime::currentTime();
-            if (started > now)                        // crossed midnight
-                started = now;
+            now.start();
 
             QEventLoop::ProcessEventsFlags flags(QEventLoop::ExcludeUserInputEvents
                                                  | QEventLoop::ExcludeSocketNotifiers
@@ -576,9 +575,7 @@ bool QX11Data::clipboardWaitForEvent(Window win, int type, XEvent *event, int ti
             if (XCheckIfEvent(X11->display, &e, checkForClipboardEvents, 0))
                 qApp->x11ProcessEvent(&e);
 
-            now = QTime::currentTime();
-            if ( started > now )                        // crossed midnight
-                started = now;
+            now.start();
 
             XFlush(X11->display);
 
diff --git a/src/gui/kernel/qcocoasharedwindowmethods_mac_p.h b/src/gui/kernel/qcocoasharedwindowmethods_mac_p.h
index 9fe5ae0..129e0a5 100644
--- a/src/gui/kernel/qcocoasharedwindowmethods_mac_p.h
+++ b/src/gui/kernel/qcocoasharedwindowmethods_mac_p.h
@@ -132,26 +132,6 @@ QT_END_NAMESPACE
     [super toggleToolbarShown:sender];
 }
 
-/*
-    The methods keyDown, keyUp, and flagsChanged... These really shouldn't ever
-    get hit. We automatically say we can be first responder if we are a window.
-    So, the handling should get handled by the view. This is here more as a
-    last resort (i.e., this is code that can potentially be removed).
- */
-- (void)keyDown:(NSEvent *)theEvent
-{
-    bool keyOK = qt_dispatchKeyEvent(theEvent, [self QT_MANGLE_NAMESPACE(qt_qwidget)]);
-    if (!keyOK)
-        [super keyDown:theEvent];
-}
-
-- (void)keyUp:(NSEvent *)theEvent
-{
-    bool keyOK = qt_dispatchKeyEvent(theEvent, [self QT_MANGLE_NAMESPACE(qt_qwidget)]);
-    if (!keyOK)
-        [super keyUp:theEvent];
-}
-
 - (void)flagsChanged:(NSEvent *)theEvent
 {
     qt_dispatchModifiersChanged(theEvent, [self QT_MANGLE_NAMESPACE(qt_qwidget)]);
diff --git a/src/gui/kernel/qcocoaview_mac.mm b/src/gui/kernel/qcocoaview_mac.mm
index 4f71681..0bc57e0 100644
--- a/src/gui/kernel/qcocoaview_mac.mm
+++ b/src/gui/kernel/qcocoaview_mac.mm
@@ -241,7 +241,8 @@ static int qCocoaViewCount = 0;
 
     QRegion mask = qt_widget_private(cursorWidget)->extra->mask;
     NSCursor *nscursor = static_cast<NSCursor *>(qt_mac_nsCursorForQCursor(cursorWidget->cursor()));
-    if (mask.isEmpty()) {
+    // The mask could have the WA_MouseNoMask attribute set and that means that we have to ignore the mask.
+    if (mask.isEmpty() || cursorWidget->testAttribute(Qt::WA_MouseNoMask)) {
         [self addCursorRect:[qt_mac_nativeview_for(cursorWidget) visibleRect] cursor:nscursor];
     } else {
         const QVector<QRect> &rects = mask.rects();
@@ -1029,11 +1030,16 @@ static int qCocoaViewCount = 0;
 {
     if (!qwidget)
         return NO;
+    // disabled widget shouldn't get focus even if it's a window.
+    // hence disabled windows will not get any key or mouse events.
+    if (!qwidget->isEnabled())
+        return NO;
     // Before accepting the focus for a window, we check that
     // the focusWidget (if any) is not contained in the same window.
-    if (qwidget->isWindow() && (!qApp->focusWidget()
-				|| qApp->focusWidget()->window() != qwidget))
+    if (qwidget->isWindow() && !qt_widget_private(qwidget)->topData()->embedded
+        && (!qApp->focusWidget() || qApp->focusWidget()->window() != qwidget)) {
         return YES;  // Always do it, so that windows can accept key press events.
+    }
     return qwidget->focusPolicy() != Qt::NoFocus;
 }
 
@@ -1044,7 +1050,16 @@ static int qCocoaViewCount = 0;
     // Seems like the following test only triggers if this
     // view is inside a QMacNativeWidget:
     if (qwidget == QApplication::focusWidget())
-        QApplicationPrivate::setFocusWidget(0, Qt::OtherFocusReason);
+        qwidget->clearFocus();
+    return YES;
+}
+
+- (BOOL)becomeFirstResponder
+{
+    // see the comment in the acceptsFirstResponder - if the window "stole" focus
+    // let it become the responder, but don't tell Qt
+    if (!QApplication::focusWidget() && qwidget->focusPolicy() != Qt::NoFocus)
+        qwidget->setFocus(Qt::OtherFocusReason);
     return YES;
 }
 
@@ -1118,8 +1133,15 @@ static int qCocoaViewCount = 0;
     }
     if (sendKeyEvents && !composing) {
         bool keyOK = qt_dispatchKeyEvent(theEvent, widgetToGetKey);
-        if (!keyOK && !sendToPopup)
-            [super keyDown:theEvent];
+        if (!keyOK && !sendToPopup) {
+            // find the first responder that is not created by Qt and forward
+            // the event to it (for example if Qt widget is embedded into native).
+            QWidget *toplevel = qwidget->window();
+            if (toplevel && qt_widget_private(toplevel)->topData()->embedded) {
+                if (NSResponder *w = [qt_mac_nativeview_for(toplevel) superview])
+                    [w keyDown:theEvent];
+            }
+        }
     }
 }
 
@@ -1128,8 +1150,13 @@ static int qCocoaViewCount = 0;
 {
     if (sendKeyEvents) {
         bool keyOK = qt_dispatchKeyEvent(theEvent, qwidget);
-        if (!keyOK)
-            [super keyUp:theEvent];
+        if (!keyOK) {
+            QWidget *toplevel = qwidget->window();
+            if (toplevel && qt_widget_private(toplevel)->topData()->embedded) {
+                if (NSResponder *w = [qt_mac_nativeview_for(toplevel) superview])
+                    [w keyUp:theEvent];
+            }
+        }
     }
 }
 
diff --git a/src/gui/kernel/qdnd_x11.cpp b/src/gui/kernel/qdnd_x11.cpp
index 9591b9a..0a05d8e 100644
--- a/src/gui/kernel/qdnd_x11.cpp
+++ b/src/gui/kernel/qdnd_x11.cpp
@@ -51,10 +51,10 @@
 #include "qbitmap.h"
 #include "qdesktopwidget.h"
 #include "qevent.h"
-#include "qdatetime.h"
 #include "qiodevice.h"
 #include "qpointer.h"
 #include "qcursor.h"
+#include "qelapsedtimer.h"
 #include "qvariant.h"
 #include "qvector.h"
 #include "qurl.h"
@@ -1911,23 +1911,19 @@ Qt::DropAction QDragManager::drag(QDrag * o)
         // then we could still have problems, but this is highly unlikely
         QApplication::flush();
 
-        QTime started = QTime::currentTime();
-        QTime now = started;
+        QElapsedTimer timer;
+        timer.start();
         do {
             XEvent event;
             if (XCheckTypedEvent(X11->display, ClientMessage, &event))
                 qApp->x11ProcessEvent(&event);
 
-            now = QTime::currentTime();
-            if (started > now) // crossed midnight
-                started = now;
-
             // sleep 50 ms, so we don't use up CPU cycles all the time.
             struct timeval usleep_tv;
             usleep_tv.tv_sec = 0;
             usleep_tv.tv_usec = 50000;
             select(0, 0, 0, 0, &usleep_tv);
-        } while (object && started.msecsTo(now) < 1000);
+        } while (object && timer.hasExpired(1000));
     }
 
     object = o;
diff --git a/src/gui/kernel/qgesture_p.h b/src/gui/kernel/qgesture_p.h
index 649a310..bf60f97 100644
--- a/src/gui/kernel/qgesture_p.h
+++ b/src/gui/kernel/qgesture_p.h
@@ -55,8 +55,8 @@
 
 #include "qrect.h"
 #include "qpoint.h"
-#include "qdatetime.h"
 #include "qgesture.h"
+#include "qelapsedtimer.h"
 #include "private/qobject_p.h"
 
 QT_BEGIN_NAMESPACE
@@ -148,7 +148,7 @@ public:
     QPoint lastPositions[3];
     bool started;
     qreal speed;
-    QTime time;
+    QElapsedTimer time;
 };
 
 class QTapGesturePrivate : public QGesturePrivate
diff --git a/src/gui/kernel/qstandardgestures.cpp b/src/gui/kernel/qstandardgestures.cpp
index 86bf1b2e..a575717 100644
--- a/src/gui/kernel/qstandardgestures.cpp
+++ b/src/gui/kernel/qstandardgestures.cpp
@@ -301,7 +301,7 @@ QGestureRecognizer::Result QSwipeGestureRecognizer::recognize(QGesture *state,
     switch (event->type()) {
     case QEvent::TouchBegin: {
         d->speed = 1;
-        d->time = QTime::currentTime();
+        d->time.start();
         d->started = true;
         result = QGestureRecognizer::MayBeGesture;
         break;
@@ -338,11 +338,10 @@ QGestureRecognizer::Result QSwipeGestureRecognizer::recognize(QGesture *state,
                              p3.screenPos().y() - d->lastPositions[2].y()) / 3;
 
             const int distance = xDistance >= yDistance ? xDistance : yDistance;
-            int elapsedTime = d->time.msecsTo(QTime::currentTime());
+            int elapsedTime = d->time.restart();
             if (!elapsedTime)
                 elapsedTime = 1;
             d->speed = 0.9 * d->speed + distance / elapsedTime;
-            d->time = QTime::currentTime();
             d->swipeAngle = QLineF(p1.startScreenPos(), p1.screenPos()).angle();
 
             static const int MoveThreshold = 50;
@@ -405,7 +404,7 @@ void QSwipeGestureRecognizer::reset(QGesture *state)
     d->lastPositions[0] = d->lastPositions[1] = d->lastPositions[2] = QPoint();
     d->started = false;
     d->speed = 0;
-    d->time = QTime();
+    d->time.invalidate();
 
     QGestureRecognizer::reset(state);
 }
diff --git a/src/gui/kernel/qt_cocoa_helpers_mac.mm b/src/gui/kernel/qt_cocoa_helpers_mac.mm
index 24fe5f7..b1e4c94 100644
--- a/src/gui/kernel/qt_cocoa_helpers_mac.mm
+++ b/src/gui/kernel/qt_cocoa_helpers_mac.mm
@@ -652,8 +652,7 @@ bool qt_dispatchKeyEventWithCocoa(void * /*NSEvent * */ keyEvent, QWidget *widge
     UInt32 macScanCode = 1;
     QKeyEventEx ke(cocoaEvent2QtEvent([event type]), qtKey, keyMods, text, [event isARepeat], qMax(1, keyLength),
                    macScanCode, [event keyCode], [event modifierFlags]);
-    qt_sendSpontaneousEvent(widgetToGetEvent, &ke);
-    return ke.isAccepted();
+    return qt_sendSpontaneousEvent(widgetToGetEvent, &ke) && ke.isAccepted();
 }
 #endif
 
@@ -703,8 +702,8 @@ bool qt_dispatchKeyEvent(void * /*NSEvent * */ keyEvent, QWidget *widgetToGetEve
     if (mustUseCocoaKeyEvent())
         return qt_dispatchKeyEventWithCocoa(keyEvent, widgetToGetEvent);
     bool isAccepted;
-    qt_keymapper_private()->translateKeyEvent(widgetToGetEvent, 0, key_event, &isAccepted, true);
-    return isAccepted;
+    bool consumed = qt_keymapper_private()->translateKeyEvent(widgetToGetEvent, 0, key_event, &isAccepted, true);
+    return consumed && isAccepted;
 #endif
 }
 
diff --git a/src/gui/kernel/qwidget_x11.cpp b/src/gui/kernel/qwidget_x11.cpp
index 10fb009..ece4be4 100644
--- a/src/gui/kernel/qwidget_x11.cpp
+++ b/src/gui/kernel/qwidget_x11.cpp
@@ -49,7 +49,7 @@
 #include "qbitmap.h"
 #include "qlayout.h"
 #include "qtextcodec.h"
-#include "qdatetime.h"
+#include "qelapsedtimer.h"
 #include "qcursor.h"
 #include "qstack.h"
 #include "qcolormap.h"
@@ -352,7 +352,7 @@ Q_GUI_EXPORT void qt_x11_wait_for_window_manager(QWidget* w)
         return;
     QApplication::flush();
     XEvent ev;
-    QTime t;
+    QElapsedTimer t;
     t.start();
     static const int maximumWaitTime = 2000;
     if (!w->testAttribute(Qt::WA_WState_Created))
@@ -369,7 +369,7 @@ Q_GUI_EXPORT void qt_x11_wait_for_window_manager(QWidget* w)
     //  ConfigureNotify ... MapNotify ... Expose
 
     enum State {
-        Initial, Reparented, Mapped
+        Initial, Mapped
     } state = Initial;
 
     do {
@@ -377,33 +377,15 @@ Q_GUI_EXPORT void qt_x11_wait_for_window_manager(QWidget* w)
             XNextEvent(X11->display, &ev);
             qApp->x11ProcessEvent(&ev);
 
-            if (w->windowFlags() & Qt::X11BypassWindowManagerHint) {
-                switch (state) {
-                case Initial:
-                case Reparented:
-                    if (ev.type == MapNotify && ev.xany.window == winid)
-                        state = Mapped;
-                    break;
-                case Mapped:
-                    if (ev.type == Expose && ev.xany.window == winid)
-                        return;
-                    break;
-                }
-            } else {
-                switch (state) {
-                case Initial:
-                    if (ev.type == ReparentNotify && ev.xany.window == winid)
-                        state = Reparented;
-                    break;
-                case Reparented:
-                    if (ev.type == MapNotify && ev.xany.window == winid)
-                        state = Mapped;
-                    break;
-                case Mapped:
-                    if (ev.type == Expose && ev.xany.window == winid)
-                        return;
-                    break;
-                }
+            switch (state) {
+            case Initial:
+                if (ev.type == MapNotify && ev.xany.window == winid)
+                    state = Mapped;
+                break;
+            case Mapped:
+                if (ev.type == Expose && ev.xany.window == winid)
+                    return;
+                break;
             }
         } else {
             if (!XEventsQueued(X11->display, QueuedAfterFlush))
diff --git a/src/gui/kernel/qx11embed_x11.cpp b/src/gui/kernel/qx11embed_x11.cpp
index 35850db..b527e72 100644
--- a/src/gui/kernel/qx11embed_x11.cpp
+++ b/src/gui/kernel/qx11embed_x11.cpp
@@ -47,7 +47,7 @@
 #include <qlayout.h>
 #include <qstyle.h>
 #include <qstyleoption.h>
-#include <qdatetime.h>
+#include <qelapsedtimer.h>
 #include <qpointer.h>
 #include <qdebug.h>
 #include <qx11info_x11.h>
@@ -1231,7 +1231,7 @@ void QX11EmbedContainer::embedClient(WId id)
       For safety, we will not wait more than 500 ms, so that we can
       preemptively workaround buggy window managers.
     */
-    QTime t;
+    QElapsedTimer t;
     t.start();
 
     functorData data;
diff --git a/src/gui/styles/qplastiquestyle.cpp b/src/gui/styles/qplastiquestyle.cpp
index 9f69fd8..4ae9f79 100644
--- a/src/gui/styles/qplastiquestyle.cpp
+++ b/src/gui/styles/qplastiquestyle.cpp
@@ -56,7 +56,6 @@ static const int blueFrameWidth =  2;  // with of line edit focus frame
 #include <qabstractitemview.h>
 #include <qcheckbox.h>
 #include <qcombobox.h>
-#include <qdatetime.h>
 #include <qdebug.h>
 #include <qdialogbuttonbox.h>
 #include <qformlayout.h>
@@ -81,6 +80,7 @@ static const int blueFrameWidth =  2;  // with of line edit focus frame
 #include <qsplitter.h>
 #include <qstyleoption.h>
 #include <qtextedit.h>
+#include <qelapsedtimer.h>
 #include <qtoolbar.h>
 #include <qtoolbox.h>
 #include <qtoolbutton.h>
@@ -980,7 +980,7 @@ public:
 #ifndef QT_NO_PROGRESSBAR
     QList<QProgressBar *> bars;
     int progressBarAnimateTimer;
-    QTime timer;
+    QElapsedTimer timer;
 #endif
 };
 
diff --git a/src/gui/styles/qwindowsstyle_p.h b/src/gui/styles/qwindowsstyle_p.h
index 808abe1..2a89b84 100644
--- a/src/gui/styles/qwindowsstyle_p.h
+++ b/src/gui/styles/qwindowsstyle_p.h
@@ -58,8 +58,8 @@
 
 #ifndef QT_NO_STYLE_WINDOWS
 #include <qlist.h>
-#include <qdatetime.h>
 #include <qhash.h>
+#include <qelapsedtimer.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -80,7 +80,7 @@ public:
     QList<QProgressBar *> bars;
     int animationFps;
     int animateTimer;
-    QTime startTime;
+    QElapsedTimer startTime;
     int animateStep;    
     QColor inactiveCaptionText;
     QColor activeCaptionColor;
diff --git a/src/gui/styles/qwindowsvistastyle_p.h b/src/gui/styles/qwindowsvistastyle_p.h
index 673568d..ab941a1 100644
--- a/src/gui/styles/qwindowsvistastyle_p.h
+++ b/src/gui/styles/qwindowsvistastyle_p.h
@@ -86,6 +86,7 @@
 #include <qlistview.h>
 #include <qtableview.h>
 #include <qbasictimer.h>
+#include <qdatetime.h>
 #include <qcommandlinkbutton.h>
 
 QT_BEGIN_NAMESPACE
diff --git a/src/gui/text/qfontdatabase_x11.cpp b/src/gui/text/qfontdatabase_x11.cpp
index bb1e60d..b1ab478 100644
--- a/src/gui/text/qfontdatabase_x11.cpp
+++ b/src/gui/text/qfontdatabase_x11.cpp
@@ -41,9 +41,9 @@
 
 #include <qplatformdefs.h>
 
-#include <qdatetime.h>
 #include <qdebug.h>
 #include <qpaintdevice.h>
+#include <qelapsedtimer.h>
 
 #include <private/qt_x11_p.h>
 #include "qx11info_x11.h"
@@ -1218,7 +1218,7 @@ static void load(const QString &family = QString(), int script = -1, bool forceX
     }
 
 #ifdef QFONTDATABASE_DEBUG
-    QTime t;
+    QElapsedTimer t;
     t.start();
 #endif
 
@@ -1301,7 +1301,7 @@ static void initializeDb()
     if (!db || db->count)
         return;
 
-    QTime t;
+    QElapsedTimer t;
     t.start();
 
 #ifndef QT_NO_FONTCONFIG
@@ -1314,7 +1314,7 @@ static void initializeDb()
     }
 
     loadFontConfig();
-    FD_DEBUG("QFontDatabase: loaded FontConfig: %d ms", t.elapsed());
+    FD_DEBUG("QFontDatabase: loaded FontConfig: %d ms", int(t.elapsed()));
 #endif
 
     t.start();
diff --git a/src/gui/widgets/qabstractslider.cpp b/src/gui/widgets/qabstractslider.cpp
index 522d472..6a01d68 100644
--- a/src/gui/widgets/qabstractslider.cpp
+++ b/src/gui/widgets/qabstractslider.cpp
@@ -764,12 +764,12 @@ void QAbstractSlider::keyPressEvent(QKeyEvent *ev)
     SliderAction action = SliderNoAction;
 #ifdef QT_KEYPAD_NAVIGATION
     if (ev->isAutoRepeat()) {
-        if (d->firstRepeat.isNull())
-            d->firstRepeat = QTime::currentTime();
+        if (!d->firstRepeat.isValid())
+            d->firstRepeat.start();
         else if (1 == d->repeatMultiplier) {
             // This is the interval in milli seconds which one key repetition
             // takes.
-            const int repeatMSecs = d->firstRepeat.msecsTo(QTime::currentTime());
+            const int repeatMSecs = d->firstRepeat.elapsed();
 
             /**
              * The time it takes to currently navigate the whole slider.
@@ -787,8 +787,8 @@ void QAbstractSlider::keyPressEvent(QKeyEvent *ev)
         }
 
     }
-    else if (!d->firstRepeat.isNull()) {
-        d->firstRepeat = QTime();
+    else if (!d->firstRepeat.isValid()) {
+        d->firstRepeat.invalidate();
         d->repeatMultiplier = 1;
     }
 
diff --git a/src/gui/widgets/qabstractslider_p.h b/src/gui/widgets/qabstractslider_p.h
index 6e6ff6e..19d1fca 100644
--- a/src/gui/widgets/qabstractslider_p.h
+++ b/src/gui/widgets/qabstractslider_p.h
@@ -54,6 +54,7 @@
 //
 
 #include "QtCore/qbasictimer.h"
+#include "QtCore/qelapsedtimer.h"
 #include "private/qwidget_p.h"
 #include "qstyle.h"
 
@@ -103,7 +104,7 @@ public:
     /**
      * The time of when the first auto repeating key press event occurs.
      */
-    QTime firstRepeat;
+    QElapsedTimer firstRepeat;
 
 #endif
 
diff --git a/src/gui/widgets/qeffects.cpp b/src/gui/widgets/qeffects.cpp
index dd7fc48..a56d093 100644
--- a/src/gui/widgets/qeffects.cpp
+++ b/src/gui/widgets/qeffects.cpp
@@ -41,7 +41,6 @@
 
 #include "qapplication.h"
 #ifndef QT_NO_EFFECTS
-#include "qdatetime.h"
 #include "qdesktopwidget.h"
 #include "qeffects_p.h"
 #include "qevent.h"
@@ -50,6 +49,7 @@
 #include "qpixmap.h"
 #include "qpointer.h"
 #include "qtimer.h"
+#include "qelapsedtimer.h"
 #include "qdebug.h"
 
 QT_BEGIN_NAMESPACE
@@ -103,7 +103,7 @@ private:
     int elapsed;
     bool showWidget;
     QTimer anim;
-    QTime checkTime;
+    QElapsedTimer checkTime;
     double windowOpacity;
 };
 
@@ -384,7 +384,7 @@ private:
     int orientation;
 
     QTimer anim;
-    QTime checkTime;
+    QElapsedTimer checkTime;
 
     QPixmap pm;
 };
diff --git a/src/gui/widgets/qlinecontrol.cpp b/src/gui/widgets/qlinecontrol.cpp
index 8e715a9..42df800 100644
--- a/src/gui/widgets/qlinecontrol.cpp
+++ b/src/gui/widgets/qlinecontrol.cpp
@@ -1767,7 +1767,6 @@ void QLineControl::processKeyEvent(QKeyEvent* event)
                 }
                 break;
 #endif
-
             default:
                 if (!handled)
                     unknown = true;
diff --git a/src/gui/widgets/qmenu_mac.mm b/src/gui/widgets/qmenu_mac.mm
index 43722a1..627043d 100644
--- a/src/gui/widgets/qmenu_mac.mm
+++ b/src/gui/widgets/qmenu_mac.mm
@@ -2060,6 +2060,22 @@ bool QMenuBarPrivate::macUpdateMenuBarImmediatly()
     QWidget *w = findWindowThatShouldDisplayMenubar();
     QMenuBar *mb = findMenubarForWindow(w);
 
+    // We need to see if we are in full screen mode, if so we need to
+    // switch the full screen mode to be able to show or hide the menubar.
+    if(w && mb) {
+        // This case means we are creating a menubar, check if full screen
+        if(w->isFullScreen()) {
+            // Ok, switch to showing the menubar when hovering over it.
+            SetSystemUIMode(kUIModeAllHidden, kUIOptionAutoShowMenuBar);
+        }
+    } else if(w) {
+        // Removing a menubar
+        if(w->isFullScreen()) {
+            // Ok, switch to not showing the menubar when hovering on it
+            SetSystemUIMode(kUIModeAllHidden, 0);
+        }
+    }
+
     if (mb && mb->isNativeMenuBar()) {
         bool modal = QApplicationPrivate::modalState();
 #ifdef QT_MAC_USE_COCOA
diff --git a/src/gui/widgets/qscrollbar.cpp b/src/gui/widgets/qscrollbar.cpp
index c0eeb2f..4ee9f27 100644
--- a/src/gui/widgets/qscrollbar.cpp
+++ b/src/gui/widgets/qscrollbar.cpp
@@ -47,7 +47,7 @@
 #include "qstyle.h"
 #include "qstyleoption.h"
 #include "qmenu.h"
-#include <QtCore/qdatetime.h>
+#include <QtCore/qelapsedtimer.h>
 
 #ifndef QT_NO_SCROLLBAR
 
@@ -613,7 +613,7 @@ void QScrollBar::mousePressEvent(QMouseEvent *e)
     }
     const int initialDelay = 500; // default threshold
     d->activateControl(d->pressedControl, initialDelay);
-    QTime time;
+    QElapsedTimer time;
     time.start();
     repaint(style()->subControlRect(QStyle::CC_ScrollBar, &opt, d->pressedControl, this));
     if (time.elapsed() >= initialDelay && d->repeatActionTimer.isActive()) {
diff --git a/src/gui/widgets/qworkspace.cpp b/src/gui/widgets/qworkspace.cpp
index 2a6a7da..7180c4d 100644
--- a/src/gui/widgets/qworkspace.cpp
+++ b/src/gui/widgets/qworkspace.cpp
@@ -44,7 +44,6 @@
 #include "qapplication.h"
 #include "qbitmap.h"
 #include "qcursor.h"
-#include "qdatetime.h"
 #include "qdesktopwidget.h"
 #include "qevent.h"
 #include "qhash.h"
@@ -59,6 +58,7 @@
 #include "qscrollbar.h"
 #include "qstyle.h"
 #include "qstyleoption.h"
+#include "qelapsedtimer.h"
 #include "qtooltip.h"
 #include "qdebug.h"
 #include <private/qwidget_p.h>
@@ -450,10 +450,10 @@ void QWorkspaceTitleBar::mousePressEvent(QMouseEvent *e)
         case QStyle::SC_TitleBarSysMenu:
             if (d->flags & Qt::WindowSystemMenuHint) {
                 d->buttonDown = QStyle::SC_None;
-                static QTime *t = 0;
+                static QElapsedTimer *t = 0;
                 static QWorkspaceTitleBar *tc = 0;
                 if (!t)
-                    t = new QTime;
+                    t = new QElapsedTimer;
                 if (tc != this || t->elapsed() > QApplication::doubleClickInterval()) {
                     emit showOperationMenu();
                     t->start();
@@ -1839,7 +1839,7 @@ bool QWorkspace::event(QEvent *e)
 bool QWorkspace::eventFilter(QObject *o, QEvent * e)
 {
     Q_D(QWorkspace);
-    static QTime* t = 0;
+    static QElapsedTimer* t = 0;
     static QWorkspace* tc = 0;
     if (o == d->maxtools) {
         switch (e->type()) {
@@ -1847,7 +1847,7 @@ bool QWorkspace::eventFilter(QObject *o, QEvent * e)
             {
                 QMenuBar* b = (QMenuBar*)o->parent();
                 if (!t)
-                    t = new QTime;
+                    t = new QElapsedTimer;
                 if (tc != this || t->elapsed() > QApplication::doubleClickInterval()) {
                     if (isRightToLeft()) {
                         QPoint p = b->mapToGlobal(QPoint(b->x() + b->width(), b->y() + b->height()));
diff --git a/src/multimedia/audio/qaudioinput_alsa_p.h b/src/multimedia/audio/qaudioinput_alsa_p.h
index 92cef83..c907019 100644
--- a/src/multimedia/audio/qaudioinput_alsa_p.h
+++ b/src/multimedia/audio/qaudioinput_alsa_p.h
@@ -61,6 +61,7 @@
 #include <QtCore/qtimer.h>
 #include <QtCore/qstring.h>
 #include <QtCore/qstringlist.h>
+#include <QtCore/qelapsedtimer.h>
 #include <QtCore/qdatetime.h>
 
 #include <QtMultimedia/qaudio.h>
@@ -116,8 +117,8 @@ private:
     void drain();
 
     QTimer* timer;
-    QTime timeStamp;
-    QTime clockStamp;
+    QElapsedTimer timeStamp;
+    QElapsedTimer clockStamp;
     qint64 elapsedTimeOffset;
     int intervalTime;
     char* audioBuffer;
diff --git a/src/multimedia/audio/qaudiooutput_alsa_p.h b/src/multimedia/audio/qaudiooutput_alsa_p.h
index 802bc27..e6ac231 100644
--- a/src/multimedia/audio/qaudiooutput_alsa_p.h
+++ b/src/multimedia/audio/qaudiooutput_alsa_p.h
@@ -60,6 +60,7 @@
 #include <QtCore/qtimer.h>
 #include <QtCore/qstring.h>
 #include <QtCore/qstringlist.h>
+#include <QtCore/qelapsedtimer.h>
 #include <QtCore/qdatetime.h>
 
 #include <QtMultimedia/qaudio.h>
@@ -133,8 +134,8 @@ private:
     QTimer* timer;
     QByteArray m_device;
     int bytesAvailable;
-    QTime timeStamp;
-    QTime clockStamp;
+    QElapsedTimer timeStamp;
+    QElapsedTimer clockStamp;
     qint64 elapsedTimeOffset;
     char* audioBuffer;
     snd_pcm_t* handle;
diff --git a/src/network/access/qnetworkaccessmanager.cpp b/src/network/access/qnetworkaccessmanager.cpp
index 1940dd1..4518d4c 100644
--- a/src/network/access/qnetworkaccessmanager.cpp
+++ b/src/network/access/qnetworkaccessmanager.cpp
@@ -880,15 +880,17 @@ QNetworkReply *QNetworkAccessManager::createRequest(QNetworkAccessManager::Opera
         return new QDisabledNetworkReply(this, req, op);
     }
 
-#ifdef QT_QNAM_DEFAULT_NETWORK_SESSION
     if (!d->networkSession && (d->initializeSession || !d->networkConfiguration.isEmpty())) {
         QNetworkConfigurationManager manager;
-        if (d->networkConfiguration.isEmpty())
-            d->createSession(manager.defaultConfiguration());
-        else
+        if (!d->networkConfiguration.isEmpty()) {
             d->createSession(manager.configurationFromIdentifier(d->networkConfiguration));
+        } else {
+            if (manager.capabilities() & QNetworkConfigurationManager::NetworkSessionRequired)
+                d->createSession(manager.defaultConfiguration());
+            else
+                d->initializeSession = false;
+        }
     }
-#endif
 
     if (d->networkSession)
         d->networkSession->setSessionProperty(QLatin1String("AutoCloseSessionTimeout"), -1);
@@ -1208,9 +1210,7 @@ void QNetworkAccessManagerPrivate::createSession(const QNetworkConfiguration &co
 {
     Q_Q(QNetworkAccessManager);
 
-#ifdef QT_QNAM_DEFAULT_NETWORK_SESSION
     initializeSession = false;
-#endif
 
     if (networkSession)
         delete networkSession;
diff --git a/src/network/access/qnetworkaccessmanager_p.h b/src/network/access/qnetworkaccessmanager_p.h
index 4a2a840..0140268 100644
--- a/src/network/access/qnetworkaccessmanager_p.h
+++ b/src/network/access/qnetworkaccessmanager_p.h
@@ -77,9 +77,7 @@ public:
 #endif
           networkSession(0),
           networkAccessEnabled(true),
-#ifdef QT_QNAM_DEFAULT_NETWORK_SESSION
           initializeSession(true),
-#endif
           cookieJarCreated(false)
     { }
     ~QNetworkAccessManagerPrivate();
@@ -126,9 +124,7 @@ public:
     QNetworkSession *networkSession;
     QString networkConfiguration;
     bool networkAccessEnabled;
-#ifdef QT_QNAM_DEFAULT_NETWORK_SESSION
     bool initializeSession;
-#endif
 
     bool cookieJarCreated;
 
diff --git a/src/network/bearer/qnetworkconfigmanager.cpp b/src/network/bearer/qnetworkconfigmanager.cpp
index e7595a4..0cd5efb 100644
--- a/src/network/bearer/qnetworkconfigmanager.cpp
+++ b/src/network/bearer/qnetworkconfigmanager.cpp
@@ -166,6 +166,8 @@ QNetworkConfigurationManagerPrivate *qNetworkConfigurationManagerPrivate()
                                      sockets.
     \value DataStatistics            If this flag is set QNetworkSession can provide statistics
                                      about transmitted and received data.
+    \value NetworkSessionRequired    If this flag is set the platform requires that a network
+                                     session is created before network operations can be performed.
 */
 
 /*!
diff --git a/src/network/bearer/qnetworkconfigmanager.h b/src/network/bearer/qnetworkconfigmanager.h
index 73041fe..bb4d8a0 100644
--- a/src/network/bearer/qnetworkconfigmanager.h
+++ b/src/network/bearer/qnetworkconfigmanager.h
@@ -64,7 +64,8 @@ public:
          SystemSessionSupport = 0x00000004,
          ApplicationLevelRoaming = 0x00000008,
          ForcedRoaming = 0x00000010,
-         DataStatistics = 0x00000020
+         DataStatistics = 0x00000020,
+         NetworkSessionRequired = 0x00000040
     };
 
     Q_DECLARE_FLAGS(Capabilities, Capability)
diff --git a/src/network/bearer/qnetworkconfiguration_p.h b/src/network/bearer/qnetworkconfiguration_p.h
index 6908277..07b472e 100644
--- a/src/network/bearer/qnetworkconfiguration_p.h
+++ b/src/network/bearer/qnetworkconfiguration_p.h
@@ -72,7 +72,7 @@ public:
     {
     }
 
-    ~QNetworkConfigurationPrivate()
+    virtual ~QNetworkConfigurationPrivate()
     {
         //release pointers to member configurations
         serviceNetworkMembers.clear(); 
diff --git a/src/network/socket/qabstractsocket.cpp b/src/network/socket/qabstractsocket.cpp
index 95721ee..21cd0fd 100644
--- a/src/network/socket/qabstractsocket.cpp
+++ b/src/network/socket/qabstractsocket.cpp
@@ -365,12 +365,12 @@
 #include "private/qhostinfo_p.h"
 
 #include <qabstracteventdispatcher.h>
-#include <qdatetime.h>
 #include <qhostaddress.h>
 #include <qhostinfo.h>
 #include <qmetaobject.h>
 #include <qpointer.h>
 #include <qtimer.h>
+#include <qelapsedtimer.h>
 
 #ifndef QT_NO_OPENSSL
 #include <QtNetwork/qsslsocket.h>
@@ -1738,7 +1738,7 @@ bool QAbstractSocket::waitForConnected(int msecs)
 
     bool wasPendingClose = d->pendingClose;
     d->pendingClose = false;
-    QTime stopWatch;
+    QElapsedTimer stopWatch;
     stopWatch.start();
 
     if (d->state == HostLookupState) {
@@ -1819,7 +1819,7 @@ bool QAbstractSocket::waitForReadyRead(int msecs)
         return false;
     }
 
-    QTime stopWatch;
+    QElapsedTimer stopWatch;
     stopWatch.start();
 
     // handle a socket in connecting state
@@ -1878,7 +1878,7 @@ bool QAbstractSocket::waitForBytesWritten(int msecs)
     if (d->writeBuffer.isEmpty())
         return false;
 
-    QTime stopWatch;
+    QElapsedTimer stopWatch;
     stopWatch.start();
 
     // handle a socket in connecting state
@@ -1960,7 +1960,7 @@ bool QAbstractSocket::waitForDisconnected(int msecs)
         return false;
     }
 
-    QTime stopWatch;
+    QElapsedTimer stopWatch;
     stopWatch.start();
 
     // handle a socket in connecting state
diff --git a/src/network/socket/qhttpsocketengine.cpp b/src/network/socket/qhttpsocketengine.cpp
index 3293ff5..dfda257 100644
--- a/src/network/socket/qhttpsocketengine.cpp
+++ b/src/network/socket/qhttpsocketengine.cpp
@@ -42,9 +42,9 @@
 #include "qhttpsocketengine_p.h"
 #include "qtcpsocket.h"
 #include "qhostaddress.h"
-#include "qdatetime.h"
 #include "qurl.h"
 #include "qhttp.h"
+#include "qelapsedtimer.h"
 
 #if !defined(QT_NO_NETWORKPROXY) && !defined(QT_NO_HTTP)
 #include <qdebug.h>
@@ -319,7 +319,7 @@ bool QHttpSocketEngine::waitForRead(int msecs, bool *timedOut)
     if (!d->socket || d->socket->state() == QAbstractSocket::UnconnectedState)
         return false;
 
-    QTime stopWatch;
+    QElapsedTimer stopWatch;
     stopWatch.start();
 
     // Wait for more data if nothing is available.
@@ -366,7 +366,7 @@ bool QHttpSocketEngine::waitForWrite(int msecs, bool *timedOut)
         return true;
     }
 
-    QTime stopWatch;
+    QElapsedTimer stopWatch;
     stopWatch.start();
 
     // If we're not connected yet, wait until we are, and until bytes have
diff --git a/src/network/socket/qlocalsocket_unix.cpp b/src/network/socket/qlocalsocket_unix.cpp
index 1ca11d8..f14decc 100644
--- a/src/network/socket/qlocalsocket_unix.cpp
+++ b/src/network/socket/qlocalsocket_unix.cpp
@@ -52,9 +52,9 @@
 #include <fcntl.h>
 #include <errno.h>
 
-#include <qdatetime.h>
 #include <qdir.h>
 #include <qdebug.h>
+#include <qelapsedtimer.h>
 
 #ifdef Q_OS_VXWORKS
 #  include <selectLib.h>
@@ -534,7 +534,7 @@ bool QLocalSocket::waitForConnected(int msec)
 
     int result = -1;
     // on Linux timeout will be updated by select, but _not_ on other systems.
-    QTime timer;
+    QElapsedTimer timer;
     timer.start();
     while (state() == ConnectingState
            && (-1 == msec || timer.elapsed() < msec)) {
diff --git a/src/network/socket/qnativesocketengine_unix.cpp b/src/network/socket/qnativesocketengine_unix.cpp
index 9a2c349..6c800fe 100644
--- a/src/network/socket/qnativesocketengine_unix.cpp
+++ b/src/network/socket/qnativesocketengine_unix.cpp
@@ -44,8 +44,8 @@
 #include "private/qnet_unix_p.h"
 #include "qiodevice.h"
 #include "qhostaddress.h"
+#include "qelapsedtimer.h"
 #include "qvarlengtharray.h"
-#include "qdatetime.h"
 #include <time.h>
 #include <errno.h>
 #include <fcntl.h>
@@ -1003,7 +1003,7 @@ int QNativeSocketEnginePrivate::nativeSelect(int timeout, bool checkRead, bool c
 #ifndef Q_OS_SYMBIAN
     ret = qt_safe_select(socketDescriptor + 1, &fdread, &fdwrite, 0, timeout < 0 ? 0 : &tv);
 #else
-    QTime timer;
+    QElapsedTimer timer;
     timer.start();
 
     do {
diff --git a/src/network/socket/qsocks5socketengine.cpp b/src/network/socket/qsocks5socketengine.cpp
index 924530e..f68edfe 100644
--- a/src/network/socket/qsocks5socketengine.cpp
+++ b/src/network/socket/qsocks5socketengine.cpp
@@ -49,7 +49,7 @@
 #include "qdebug.h"
 #include "qhash.h"
 #include "qqueue.h"
-#include "qdatetime.h"
+#include "qelapsedtimer.h"
 #include "qmutex.h"
 #include "qthread.h"
 #include "qcoreapplication.h"
@@ -308,7 +308,7 @@ struct QSocks5BindData : public QSocks5Data
     quint16 localPort;
     QHostAddress peerAddress;
     quint16 peerPort;
-    QDateTime timeStamp;
+    QElapsedTimer timeStamp;
 };
 
 struct QSocks5RevivedDatagram
@@ -369,7 +369,7 @@ void QSocks5BindStore::add(int socketDescriptor, QSocks5BindData *bindData)
     if (store.contains(socketDescriptor)) {
         // qDebug() << "delete it";
     }
-    bindData->timeStamp = QDateTime::currentDateTime();
+    bindData->timeStamp.start();
     store.insert(socketDescriptor, bindData);
     // start sweep timer if not started
     if (sweepTimerId == -1)
@@ -412,7 +412,7 @@ void QSocks5BindStore::timerEvent(QTimerEvent * event)
         QMutableHashIterator<int, QSocks5BindData *> it(store);
         while (it.hasNext()) {
             it.next();
-            if (it.value()->timeStamp.secsTo(QDateTime::currentDateTime()) > 350) {
+            if (it.value()->timeStamp.hasExpired(350000)) {
                 QSOCKS5_DEBUG << "QSocks5BindStore removing JJJJ";
                 it.remove();
             }
@@ -1355,7 +1355,7 @@ bool QSocks5SocketEngine::bind(const QHostAddress &address, quint16 port)
     }
 
     int msecs = SOCKS5_BLOCKING_BIND_TIMEOUT;
-    QTime stopWatch;
+    QElapsedTimer stopWatch;
     stopWatch.start();
     d->data->controlSocket->connectToHost(d->proxyInfo.hostName(), d->proxyInfo.port());
     if (!d->waitForConnected(msecs, 0) ||
@@ -1455,7 +1455,7 @@ void QSocks5SocketEngine::close()
     if (d->data && d->data->controlSocket) {
         if (d->data->controlSocket->state() == QAbstractSocket::ConnectedState) {
             int msecs = 100;
-            QTime stopWatch;
+            QElapsedTimer stopWatch;
             stopWatch.start();
             while (!d->data->controlSocket->bytesToWrite()) {
                if (!d->data->controlSocket->waitForBytesWritten(qt_timeout_value(msecs, stopWatch.elapsed())))
@@ -1674,7 +1674,7 @@ bool QSocks5SocketEnginePrivate::waitForConnected(int msecs, bool *timedOut)
         mode == BindMode ? BindSuccess :
         UdpAssociateSuccess;
 
-    QTime stopWatch;
+    QElapsedTimer stopWatch;
     stopWatch.start();
 
     while (socks5State != wantedState) {
@@ -1699,7 +1699,7 @@ bool QSocks5SocketEngine::waitForRead(int msecs, bool *timedOut)
 
     d->readNotificationActivated = false;
 
-    QTime stopWatch;
+    QElapsedTimer stopWatch;
     stopWatch.start();
 
     // are we connected yet?
@@ -1749,7 +1749,7 @@ bool QSocks5SocketEngine::waitForWrite(int msecs, bool *timedOut)
     Q_D(QSocks5SocketEngine);
     QSOCKS5_DEBUG << "waitForWrite" << msecs;
 
-    QTime stopWatch;
+    QElapsedTimer stopWatch;
     stopWatch.start();
 
     // are we connected yet?
diff --git a/src/network/ssl/qsslsocket.cpp b/src/network/ssl/qsslsocket.cpp
index 9623570..86b11b9 100644
--- a/src/network/ssl/qsslsocket.cpp
+++ b/src/network/ssl/qsslsocket.cpp
@@ -286,8 +286,8 @@
 
 #include <QtCore/qdebug.h>
 #include <QtCore/qdir.h>
-#include <QtCore/qdatetime.h>
 #include <QtCore/qmutex.h>
+#include <QtCore/qelapsedtimer.h>
 #include <QtNetwork/qhostaddress.h>
 #include <QtNetwork/qhostinfo.h>
 
@@ -1393,7 +1393,7 @@ bool QSslSocket::waitForEncrypted(int msecs)
     if (d->mode == UnencryptedMode && !d->autoStartHandshake)
         return false;
 
-    QTime stopWatch;
+    QElapsedTimer stopWatch;
     stopWatch.start();
 
     if (d->plainSocket->state() != QAbstractSocket::ConnectedState) {
@@ -1433,7 +1433,7 @@ bool QSslSocket::waitForReadyRead(int msecs)
     bool *previousReadyReadEmittedPointer = d->readyReadEmittedPointer;
     d->readyReadEmittedPointer = &readyReadEmitted;
 
-    QTime stopWatch;
+    QElapsedTimer stopWatch;
     stopWatch.start();
 
     if (!d->connectionEncrypted) {
@@ -1470,7 +1470,7 @@ bool QSslSocket::waitForBytesWritten(int msecs)
     if (d->mode == UnencryptedMode)
         return d->plainSocket->waitForBytesWritten(msecs);
 
-    QTime stopWatch;
+    QElapsedTimer stopWatch;
     stopWatch.start();
 
     if (!d->connectionEncrypted) {
@@ -1508,7 +1508,7 @@ bool QSslSocket::waitForDisconnected(int msecs)
     if (d->mode == UnencryptedMode)
         return d->plainSocket->waitForDisconnected(msecs);
 
-    QTime stopWatch;
+    QElapsedTimer stopWatch;
     stopWatch.start();
 
     if (!d->connectionEncrypted) {
diff --git a/src/plugins/bearer/icd/qicdengine.cpp b/src/plugins/bearer/icd/qicdengine.cpp
index 5e9dc0a..f70a209 100644
--- a/src/plugins/bearer/icd/qicdengine.cpp
+++ b/src/plugins/bearer/icd/qicdengine.cpp
@@ -417,7 +417,8 @@ QNetworkConfigurationManager::Capabilities QIcdEngine::capabilities() const
 {
     return QNetworkConfigurationManager::CanStartAndStopInterfaces |
            QNetworkConfigurationManager::DataStatistics |
-           QNetworkConfigurationManager::ForcedRoaming;
+           QNetworkConfigurationManager::ForcedRoaming |
+           QNetworkConfigurationManager::NetworkSessionRequired;
 }
 
 QNetworkSessionPrivate *QIcdEngine::createSessionBackend()
diff --git a/src/plugins/bearer/symbian/symbianengine.cpp b/src/plugins/bearer/symbian/symbianengine.cpp
index 980892a..4d65b80 100644
--- a/src/plugins/bearer/symbian/symbianengine.cpp
+++ b/src/plugins/bearer/symbian/symbianengine.cpp
@@ -184,7 +184,8 @@ QNetworkConfigurationManager::Capabilities SymbianEngine::capabilities() const
     capFlags = QNetworkConfigurationManager::CanStartAndStopInterfaces |
                QNetworkConfigurationManager::DirectConnectionRouting |
                QNetworkConfigurationManager::SystemSessionSupport |
-               QNetworkConfigurationManager::DataStatistics;
+               QNetworkConfigurationManager::DataStatistics |
+               QNetworkConfigurationManager::NetworkSessionRequired;
 
 #ifdef SNAP_FUNCTIONALITY_AVAILABLE
     capFlags |= QNetworkConfigurationManager::ApplicationLevelRoaming |
diff --git a/src/testlib/qtestcoreelement.h b/src/testlib/qtestcoreelement.h
index 4738f7d..e1ad44a 100644
--- a/src/testlib/qtestcoreelement.h
+++ b/src/testlib/qtestcoreelement.h
@@ -45,8 +45,6 @@
 #include <QtTest/qtestcorelist.h>
 #include <QtTest/qtestelementattribute.h>
 
-#include <cstdlib>
-
 QT_BEGIN_HEADER
 
 QT_BEGIN_NAMESPACE
@@ -95,9 +93,6 @@ void QTestCoreElement<ElementType>::addAttribute(const QTest::AttributeIndex att
     if (attribute(attributeIndex))
         return;
 
-    // if (attributeIndex == QTest::AI_Metric)
-    //     abort();
-
     QTestElementAttribute *testAttribute = new QTestElementAttribute;
     testAttribute->setPair(attributeIndex, value);
     testAttribute->addToList(&listOfAttributes);
diff --git a/src/testlib/qtestsystem.h b/src/testlib/qtestsystem.h
index 3c11cdd..82d69d6 100644
--- a/src/testlib/qtestsystem.h
+++ b/src/testlib/qtestsystem.h
@@ -44,7 +44,7 @@
 
 #include <QtTest/qtestcase.h>
 #include <QtCore/qcoreapplication.h>
-#include <QtCore/qdatetime.h>
+#include <QtCore/qelapsedtimer.h>
 
 QT_BEGIN_HEADER
 
@@ -63,7 +63,7 @@ namespace QTest
     {
         Q_ASSERT(QCoreApplication::instance());
 
-        QTime timer;
+        QElapsedTimer timer;
         timer.start();
         do {
             QCoreApplication::processEvents(QEventLoop::AllEvents, ms);
diff --git a/src/tools/bootstrap/bootstrap.pri b/src/tools/bootstrap/bootstrap.pri
index b3ee948..6442526 100644
--- a/src/tools/bootstrap/bootstrap.pri
+++ b/src/tools/bootstrap/bootstrap.pri
@@ -51,7 +51,7 @@ hpux-acc*|hpuxi-acc* {
     }
     LIBS += -lbootstrap
 }
-!contains(QT_CONFIG, zlib):!contains(QT_CONFIG, no-zlib) {
+!contains(QT_CONFIG, zlib):!contains(QT_CONFIG, no-zlib):!cross_compile {
    unix:LIBS += -lz
 #  win32:LIBS += libz.lib
 }
diff --git a/src/tools/bootstrap/bootstrap.pro b/src/tools/bootstrap/bootstrap.pro
index 0dbb90f..7e91333 100644
--- a/src/tools/bootstrap/bootstrap.pro
+++ b/src/tools/bootstrap/bootstrap.pro
@@ -95,7 +95,7 @@ macx: {
    LIBS += -framework CoreServices
 }
 
-contains(QT_CONFIG, zlib) {
+contains(QT_CONFIG, zlib)|cross_compile {
    INCLUDEPATH += ../../3rdparty/zlib
    SOURCES+= \
         ../3rdparty/zlib/adler32.c \