Change event posting to use a QVector.

This provides a ~10% improvement to the newly introduced QCoreApplication
event_posting_benchmark (a simple synthetic benchmark of creating a bunch of
events, posting them, and sending the queue).

before:
********* Start testing of QCoreApplicationBenchmark *********
Config: Using QTest library 5.0.0, Qt 5.0.0
PASS   : QCoreApplicationBenchmark::initTestCase()
RESULT : QCoreApplicationBenchmark::signal_slot_benchmark():"1000":
     0.82 msecs per iteration (total: 53, iterations: 64)
RESULT : QCoreApplicationBenchmark::signal_slot_benchmark():"10000":
     8.6 msecs per iteration (total: 69, iterations: 8)
RESULT : QCoreApplicationBenchmark::signal_slot_benchmark():"100000":
     84 msecs per iteration (total: 84, iterations: 1)
RESULT : QCoreApplicationBenchmark::signal_slot_benchmark():"1000000":
     874 msecs per iteration (total: 874, iterations: 1)
PASS   : QCoreApplicationBenchmark::signal_slot_benchmark()
PASS   : QCoreApplicationBenchmark::cleanupTestCase()
Totals: 3 passed, 0 failed, 0 skipped
********* Finished testing of QCoreApplicationBenchmark *********

after:
********* Start testing of QCoreApplicationBenchmark *********
Config: Using QTest library 5.0.0, Qt 5.0.0
PASS   : QCoreApplicationBenchmark::initTestCase()
RESULT : QCoreApplicationBenchmark::event_posting_benchmark():"1000 events":
     0.781 msecs per iteration (total: 100, iterations: 128)
RESULT : QCoreApplicationBenchmark::event_posting_benchmark():"10000 events":
     7.8 msecs per iteration (total: 63, iterations: 8)
RESULT : QCoreApplicationBenchmark::event_posting_benchmark():"100000 events":
     75 msecs per iteration (total: 75, iterations: 1)
RESULT : QCoreApplicationBenchmark::event_posting_benchmark():"1000000 events":
     774 msecs per iteration (total: 774, iterations: 1)
PASS   : QCoreApplicationBenchmark::event_posting_benchmark()
PASS   : QCoreApplicationBenchmark::cleanupTestCase()
Totals: 3 passed, 0 failed, 0 skipped
********* Finished testing of QCoreApplicationBenchmark *********

Change-Id: Ibf56d9526b0a8cbaf171008da4104bb457628172
Reviewed-by: Sergio Ahumada <sergio.ahumada@nokia.com>

3 files changed, 93 insertions, 1 deletions

diff --git a/tests/benchmarks/corelib/kernel/kernel.pro b/tests/benchmarks/corelib/kernel/kernel.pro
index da3f0d609f..8b7d8c8f90 100644
--- a/tests/benchmarks/corelib/kernel/kernel.pro
+++ b/tests/benchmarks/corelib/kernel/kernel.pro
@@ -4,4 +4,5 @@ SUBDIRS = \
         qmetaobject \
         qmetatype \
         qobject \
-        qvariant
+        qvariant \
+        qcoreapplication
diff --git a/tests/benchmarks/corelib/kernel/qcoreapplication/main.cpp b/tests/benchmarks/corelib/kernel/qcoreapplication/main.cpp
new file mode 100644
index 0000000000..e1e4e2cc9a
--- /dev/null
+++ b/tests/benchmarks/corelib/kernel/qcoreapplication/main.cpp
@@ -0,0 +1,82 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Robin Burchell <robin+qt@viroteck.net>
+** 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 <QtCore>
+#include <qtest.h>
+#include <qcoreapplication.h>
+
+class QCoreApplicationBenchmark : public QObject
+{
+Q_OBJECT
+private slots:
+    void event_posting_benchmark_data();
+    void event_posting_benchmark();
+};
+
+void QCoreApplicationBenchmark::event_posting_benchmark_data()
+{
+    QTest::addColumn<int>("size");
+    QTest::newRow("50 events") << 50;
+    QTest::newRow("100 events") << 100;
+    QTest::newRow("200 events") << 200;
+    QTest::newRow("1000 events") << 1000;
+    QTest::newRow("10000 events") << 10000;
+    QTest::newRow("100000 events") << 100000;
+    QTest::newRow("1000000 events") << 1000000;
+}
+
+void QCoreApplicationBenchmark::event_posting_benchmark()
+{
+    QFETCH(int, size);
+
+    int type = QEvent::registerEventType();
+    QCoreApplication *app = QCoreApplication::instance();
+
+    // benchmark posting & sending events
+    QBENCHMARK {
+        for (int i = 0; i < size; ++i)
+            QCoreApplication::postEvent(app, new QEvent(QEvent::Type(type)));
+        QCoreApplication::sendPostedEvents();
+    }
+}
+
+QTEST_MAIN(QCoreApplicationBenchmark)
+
+#include "main.moc"
diff --git a/tests/benchmarks/corelib/kernel/qcoreapplication/qcoreapplication.pro b/tests/benchmarks/corelib/kernel/qcoreapplication/qcoreapplication.pro
new file mode 100644
index 0000000000..2c29fafca4
--- /dev/null
+++ b/tests/benchmarks/corelib/kernel/qcoreapplication/qcoreapplication.pro
@@ -0,0 +1,9 @@
+QT += testlib
+
+TEMPLATE = app
+TARGET = tst_bench_qcoreapplication
+DEPENDPATH += .
+INCLUDEPATH += .
+
+# Input
+SOURCES += main.cpp