diff -r b72c6db6890b -r 5dc02b23752f src/corelib/thread/qthread.cpp
--- a/src/corelib/thread/qthread.cpp	Wed Jun 23 19:07:03 2010 +0300
+++ b/src/corelib/thread/qthread.cpp	Tue Jul 06 15:10:48 2010 +0300
@@ -173,7 +173,7 @@
 */
 
 QThreadPrivate::QThreadPrivate(QThreadData *d)
-    : QObjectPrivate(), running(false), finished(false), terminated(false),
+    : QObjectPrivate(), running(false), finished(false), terminated(false), exited(false), returnCode(-1),
       stackSize(0), priority(QThread::InheritPriority), data(d)
 {
 #if defined (Q_OS_UNIX)
@@ -482,9 +482,16 @@
     Q_D(QThread);
     QMutexLocker locker(&d->mutex);
     d->data->quitNow = false;
-    QEventLoop eventLoop;
+    if (d->exited)
+        return d->returnCode;
     locker.unlock();
+
+    QEventLoop eventLoop;
     int returnCode = eventLoop.exec();
+
+    locker.relock();
+    d->exited = false;
+    d->returnCode = -1;
     return returnCode;
 }
 
@@ -511,6 +518,8 @@
 {
     Q_D(QThread);
     QMutexLocker locker(&d->mutex);
+    d->exited = true;
+    d->returnCode = returnCode;
     d->data->quitNow = true;
     for (int i = 0; i < d->data->eventLoops.size(); ++i) {
         QEventLoop *eventLoop = d->data->eventLoops.at(i);
@@ -617,7 +626,9 @@
 {
     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);
 }
 
 /*!