Make the default size of QMutexPool a prime number

As pointed out by Olivier, this should allow for better distribution
in the array.

I also removed the unnecessary count member, since we can use
QVarLengthArray.count() instead.

1 files changed, 2 insertions, 3 deletions

diff --git a/src/corelib/thread/qmutexpool_p.h b/src/corelib/thread/qmutexpool_p.h
index 4c1e32c..30a16d4 100644
--- a/src/corelib/thread/qmutexpool_p.h
+++ b/src/corelib/thread/qmutexpool_p.h
@@ -64,7 +64,7 @@ QT_BEGIN_NAMESPACE
 class Q_CORE_EXPORT QMutexPool
 {
 public:
-    explicit QMutexPool(QMutex::RecursionMode recursionMode = QMutex::NonRecursive, int size = 128);
+    explicit QMutexPool(QMutex::RecursionMode recursionMode = QMutex::NonRecursive, int size = 131);
     ~QMutexPool();
 
     QMutex *get(const void *address);
@@ -72,8 +72,7 @@ public:
     static QMutex *globalInstanceGet(const void *address);
 
 private:
-    QVarLengthArray<QAtomicPointer<QMutex>, 128> mutexes;
-    int count;
+    QVarLengthArray<QAtomicPointer<QMutex>, 131> mutexes;
     QMutex::RecursionMode recursionMode;
 };