File QMimeDatabase-use-QElapsedTimer.patch of Package libqt5-qtbase

From 849aebc0ce344dedc91035bf4bcc7ccb4c15ffe4 Mon Sep 17 00:00:00 2001
From: David Faure <david.faure@kdab.com>
Date: Mon, 27 Jul 2015 00:22:11 +0200
Subject: [PATCH] QMimeDatabase: use QElapsedTimer instead of
 QDateTime::currentDateTime()

This reduces the number of syscalls greatly, by avoiding the timezone
conversion every time.

Change-Id: I39a54def4b45f25c6e037ced6943b05ddc749c9d
---
 src/corelib/mimetypes/qmimeprovider.cpp | 5 ++---
 src/corelib/mimetypes/qmimeprovider_p.h | 3 ++-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/corelib/mimetypes/qmimeprovider.cpp b/src/corelib/mimetypes/qmimeprovider.cpp
index 7342a5c..3914710 100644
--- a/src/corelib/mimetypes/qmimeprovider.cpp
+++ b/src/corelib/mimetypes/qmimeprovider.cpp
@@ -79,10 +79,9 @@ Q_CORE_EXPORT int qmime_secondsBetweenChecks = 5; // exported for the unit test
 
 bool QMimeProviderBase::shouldCheck()
 {
-    const QDateTime now = QDateTime::currentDateTime();
-    if (m_lastCheck.isValid() && m_lastCheck.secsTo(now) < qmime_secondsBetweenChecks)
+    if (m_lastCheck.isValid() && m_lastCheck.elapsed() < qmime_secondsBetweenChecks * 1000)
         return false;
-    m_lastCheck = now;
+    m_lastCheck.start();
     return true;
 }
 
diff --git a/src/corelib/mimetypes/qmimeprovider_p.h b/src/corelib/mimetypes/qmimeprovider_p.h
index 5a89ac2..eaf9594 100644
--- a/src/corelib/mimetypes/qmimeprovider_p.h
+++ b/src/corelib/mimetypes/qmimeprovider_p.h
@@ -51,6 +51,7 @@
 
 #include <QtCore/qdatetime.h>
 #include <QtCore/qset.h>
+#include <QtCore/qelapsedtimer.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -77,7 +78,7 @@ public:
     QMimeDatabasePrivate *m_db;
 protected:
     bool shouldCheck();
-    QDateTime m_lastCheck;
+    QElapsedTimer m_lastCheck;
 };
 
 /*
-- 
2.3.5