Initial import from the monolithic Qt.

This is the beginning of revision history for this module. If you
want to look at revision history older than this, please refer to the
Qt Git wiki for how to use Git history grafting. At the time of
writing, this wiki is located here:

http://qt.gitorious.org/qt/pages/GitIntroductionWithQt

If you have already performed the grafting and you don't see any
history beyond this commit, try running "git log" with the "--follow"
argument.

Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 132 insertions, 0 deletions

diff --git a/src/corelib/tools/qelapsedtimer_mac.cpp b/src/corelib/tools/qelapsedtimer_mac.cpp
new file mode 100644
index 0000000000..110549a020
--- /dev/null
+++ b/src/corelib/tools/qelapsedtimer_mac.cpp
@@ -0,0 +1,132 @@
+/****************************************************************************
+**
+** 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 QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, 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.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qelapsedtimer.h"
+#include <sys/time.h>
+#include <unistd.h>
+
+#include <mach/mach_time.h>
+
+QT_BEGIN_NAMESPACE
+
+QElapsedTimer::ClockType QElapsedTimer::clockType()
+{
+    return MachAbsoluteTime;
+}
+
+bool QElapsedTimer::isMonotonic()
+{
+    return true;
+}
+
+static mach_timebase_info_data_t info = {0,0};
+static qint64 absoluteToNSecs(qint64 cpuTime)
+{
+    if (info.denom == 0)
+        mach_timebase_info(&info);
+    qint64 nsecs = cpuTime * info.numer / info.denom;
+    return nsecs;
+}
+
+static qint64 absoluteToMSecs(qint64 cpuTime)
+{
+    return absoluteToNSecs(cpuTime) / 1000000;
+}
+
+timeval qt_gettime()
+{
+    timeval tv;
+
+    uint64_t cpu_time = mach_absolute_time();
+    uint64_t nsecs = absoluteToNSecs(cpu_time);
+    tv.tv_sec = nsecs / 1000000000ull;
+    tv.tv_usec = (nsecs / 1000) - (tv.tv_sec * 1000000);
+    return tv;
+}
+
+void QElapsedTimer::start()
+{
+    t1 = mach_absolute_time();
+    t2 = 0;
+}
+
+qint64 QElapsedTimer::restart()
+{
+    qint64 old = t1;
+    t1 = mach_absolute_time();
+    t2 = 0;
+
+    return absoluteToMSecs(t1 - old);
+}
+
+qint64 QElapsedTimer::nsecsElapsed() const
+{
+    uint64_t cpu_time = mach_absolute_time();
+    return absoluteToNSecs(cpu_time - t1);
+}
+
+qint64 QElapsedTimer::elapsed() const
+{
+    uint64_t cpu_time = mach_absolute_time();
+    return absoluteToMSecs(cpu_time - t1);
+}
+
+qint64 QElapsedTimer::msecsSinceReference() const
+{
+    return absoluteToMSecs(t1);
+}
+
+qint64 QElapsedTimer::msecsTo(const QElapsedTimer &other) const
+{
+    return absoluteToMSecs(other.t1 - t1);
+}
+
+qint64 QElapsedTimer::secsTo(const QElapsedTimer &other) const
+{
+    return msecsTo(other) / 1000;
+}
+
+bool operator<(const QElapsedTimer &v1, const QElapsedTimer &v2)
+{
+    return v1.t1 < v2.t1;
+}
+
+QT_END_NAMESPACE