1 files changed, 8 insertions, 5 deletions
diff --git a/src/corelib/thread/qfutureinterface.h b/src/corelib/thread/qfutureinterface.h
index d5e2401eee..bcdae24833 100644
--- a/src/corelib/thread/qfutureinterface.h
+++ b/src/corelib/thread/qfutureinterface.h
@@ -45,6 +45,8 @@
 #include <QtCore/qexception.h>
 #include <QtCore/qresultstore.h>
 
+#include <mutex>
+
 QT_REQUIRE_CONFIG(future);
 
 QT_BEGIN_NAMESPACE
@@ -118,6 +120,7 @@ public:
     void waitForResume();
 
     QMutex *mutex() const;
+    QMutex &mutex(int) const;
     QtPrivate::ExceptionStore &exceptionStore();
     QtPrivate::ResultStoreBase &resultStoreBase();
     const QtPrivate::ResultStoreBase &resultStoreBase() const;
@@ -188,7 +191,7 @@ public:
 template <typename T>
 inline void QFutureInterface<T>::reportResult(const T *result, int index)
 {
-    QMutexLocker locker(mutex());
+    std::lock_guard<QMutex> locker(mutex(0));
     if (this->queryState(Canceled) || this->queryState(Finished)) {
         return;
     }
@@ -214,7 +217,7 @@ inline void QFutureInterface<T>::reportResult(const T &result, int index)
 template <typename T>
 inline void QFutureInterface<T>::reportResults(const QVector<T> &_results, int beginIndex, int count)
 {
-    QMutexLocker locker(mutex());
+    std::lock_guard<QMutex> locker(mutex(0));
     if (this->queryState(Canceled) || this->queryState(Finished)) {
         return;
     }
@@ -242,14 +245,14 @@ inline void QFutureInterface<T>::reportFinished(const T *result)
 template <typename T>
 inline const T &QFutureInterface<T>::resultReference(int index) const
 {
-    QMutexLocker lock(mutex());
+    std::lock_guard<QMutex> locker(mutex(0));
     return resultStoreBase().resultAt(index).template value<T>();
 }
 
 template <typename T>
 inline const T *QFutureInterface<T>::resultPointer(int index) const
 {
-    QMutexLocker lock(mutex());
+    std::lock_guard<QMutex> locker(mutex(0));
     return resultStoreBase().resultAt(index).template pointer<T>();
 }
 
@@ -263,7 +266,7 @@ inline QList<T> QFutureInterface<T>::results()
     QFutureInterfaceBase::waitForResult(-1);
 
     QList<T> res;
-    QMutexLocker lock(mutex());
+    std::lock_guard<QMutex> locker(mutex(0));
 
     QtPrivate::ResultIteratorBase it = resultStoreBase().begin();
     while (it != resultStoreBase().end()) {