4 files changed, 135 insertions, 0 deletions
diff --git a/tests/auto/other/other.pro b/tests/auto/other/other.pro
index 0224bb416c..fe36713117 100644
--- a/tests/auto/other/other.pro
+++ b/tests/auto/other/other.pro
@@ -4,6 +4,7 @@ SUBDIRS=\
    baselineexample \
    compiler \
    headersclean \
+   qobjectperformance \
    qtokenautomaton \
 
 cross_compile: SUBDIRS -= \
diff --git a/tests/auto/other/qobjectperformance/.gitignore b/tests/auto/other/qobjectperformance/.gitignore
new file mode 100644
index 0000000000..028ca89aad
--- /dev/null
+++ b/tests/auto/other/qobjectperformance/.gitignore
@@ -0,0 +1 @@
+tst_qobjectperformance
diff --git a/tests/auto/other/qobjectperformance/qobjectperformance.pro b/tests/auto/other/qobjectperformance/qobjectperformance.pro
new file mode 100644
index 0000000000..189f8eeb2a
--- /dev/null
+++ b/tests/auto/other/qobjectperformance/qobjectperformance.pro
@@ -0,0 +1,7 @@
+CONFIG += testcase
+TARGET = tst_qobjectperformance
+SOURCES  += tst_qobjectperformance.cpp
+
+QT = core network testlib
+
+
diff --git a/tests/auto/other/qobjectperformance/tst_qobjectperformance.cpp b/tests/auto/other/qobjectperformance/tst_qobjectperformance.cpp
new file mode 100644
index 0000000000..26145a0df4
--- /dev/null
+++ b/tests/auto/other/qobjectperformance/tst_qobjectperformance.cpp
@@ -0,0 +1,126 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+
+#include <QtTest/QtTest>
+
+#include <qcoreapplication.h>
+
+#include <qobject.h>
+
+//TESTED_CLASS=
+//TESTED_FILES=corelib/kernel/qobject.h corelib/kernel/qobject.cpp
+
+class tst_QObjectPerformance : public QObject
+{
+    Q_OBJECT
+
+public:
+
+private slots:
+    void emitToManyReceivers();
+};
+
+class SimpleSenderObject : public QObject
+{
+    Q_OBJECT
+
+signals:
+    void signal();
+
+public:
+    void emitSignal()
+    {
+        emit signal();
+    }
+};
+
+class SimpleReceiverObject : public QObject
+{
+    Q_OBJECT
+
+public slots:
+    void slot()
+    {
+    }
+};
+
+void tst_QObjectPerformance::emitToManyReceivers()
+{
+    // ensure that emission times remain mostly linear as the number of receivers increase
+
+    SimpleSenderObject sender;
+    int elapsed = 0;
+    const int increase = 3000;
+    const int base = 5000;
+
+    for (int i = 0; i < 4; ++i) {
+        const int size = base + i * increase;
+        const double increaseRatio = double(size) / (double)(size - increase);
+
+        QList<SimpleReceiverObject *> receivers;
+        for (int k = 0; k < size; ++k) {
+            SimpleReceiverObject *receiver = new SimpleReceiverObject;
+            QObject::connect(&sender, SIGNAL(signal()), receiver, SLOT(slot()));
+            receivers.append(receiver);
+        }
+
+        QTime timer;
+        timer.start();
+        sender.emitSignal();
+        int e = timer.elapsed();
+
+        if (elapsed > 1) {
+            qDebug() << size << "receivers, elapsed time" << e << "compared to previous time" << elapsed;
+            QVERIFY(double(e) / double(elapsed) <= increaseRatio * 2.0);
+        } else {
+            qDebug() << size << "receivers, elapsed time" << e << "cannot be compared to previous, unmeasurable time";
+        }
+        elapsed = e;
+
+        qDeleteAll(receivers);
+        receivers.clear();
+    }
+}
+
+
+QTEST_MAIN(tst_QObjectPerformance)
+#include "tst_qobjectperformance.moc"