Long live Qt 4.5!

1 files changed, 196 insertions, 0 deletions

diff --git a/src/network/kernel/qhostinfo_p.h b/src/network/kernel/qhostinfo_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtNetwork 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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QHOSTINFO_P_H
+#define QHOSTINFO_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of the QLibrary class.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "QtCore/qcoreapplication.h"
+#include "private/qcoreapplication_p.h"
+#include "QtNetwork/qhostinfo.h"
+#include "QtCore/qmutex.h"
+#include "QtCore/qwaitcondition.h"
+#include "QtCore/qobject.h"
+#include "QtCore/qpointer.h"
+
+#if !defined QT_NO_THREAD
+#include "QtCore/qthread.h"
+#    define QHostInfoAgentBase QThread
+#else
+#    define QHostInfoAgentBase QObject
+#endif
+
+QT_BEGIN_NAMESPACE
+
+static const int QHOSTINFO_THREAD_WAIT = 250; // ms
+
+class QHostInfoResult : public QObject
+{
+    Q_OBJECT
+public Q_SLOTS:
+    inline void emitResultsReady(const QHostInfo &info)
+    {
+        emit resultsReady(info);
+        if (autoDelete)
+            delete this;
+    }
+
+Q_SIGNALS:
+    void resultsReady(const QHostInfo &info);
+
+public:
+    int lookupId;
+    bool autoDelete;
+};
+
+struct QHostInfoQuery
+{
+    inline QHostInfoQuery() : object(0) {}
+    inline ~QHostInfoQuery() { delete object; }
+    inline QHostInfoQuery(const QString &name, QHostInfoResult *result)
+        : hostName(name), object(result) {}
+
+    QString hostName;
+    QHostInfoResult *object;
+};
+
+class QHostInfoAgent : public QHostInfoAgentBase
+{
+    Q_OBJECT
+public:
+    inline QHostInfoAgent()
+    {
+        // There is a chance that there will be two instances of
+        // QHostInfoAgent if two threads try to get Q_GLOBAL_STATIC
+        // object at the same time. The second object will be deleted
+        // immediately before anyone uses it, but we need to be
+        // careful about what we do in the constructor.
+        static QBasicAtomicInt done = Q_BASIC_ATOMIC_INITIALIZER(0);
+        if (done.testAndSetRelaxed(0, 1))
+            qAddPostRoutine(staticCleanup);
+        moveToThread(QCoreApplicationPrivate::mainThread());
+        quit = false;
+        pendingQueryId = -1;
+    }
+    inline ~QHostInfoAgent()
+    { cleanup(); }
+
+    void run();
+    static QHostInfo fromName(const QString &hostName);
+
+    inline void addHostName(const QString &name, QHostInfoResult *result)
+    {
+        QMutexLocker locker(&mutex);
+        queries << new QHostInfoQuery(name, result);
+        cond.wakeOne();
+    }
+
+    inline void abortLookup(int id)
+    {
+        QMutexLocker locker(&mutex);
+        for (int i = 0; i < queries.size(); ++i) {
+            QHostInfoResult *result = queries.at(i)->object;
+            if (result->lookupId == id) {
+                result->disconnect();
+                delete queries.takeAt(i);
+                return;
+            }
+        }
+        if (pendingQueryId == id)
+            pendingQueryId = -1;
+    }
+
+    static void staticCleanup();
+
+public Q_SLOTS:
+    inline void cleanup()
+    {
+        {
+            QMutexLocker locker(&mutex);
+            qDeleteAll(queries);
+            queries.clear();
+            quit = true;
+            cond.wakeOne();
+        }
+#ifndef QT_NO_THREAD
+        if (!wait(QHOSTINFO_THREAD_WAIT))
+            terminate();
+        wait();
+#endif
+    }
+
+private:
+    QList<QHostInfoQuery *> queries;
+    QMutex mutex;
+    QWaitCondition cond;
+    volatile bool quit;
+    int pendingQueryId;
+};
+
+class QHostInfoPrivate
+{
+public:
+    inline QHostInfoPrivate()
+        : err(QHostInfo::NoError),
+          errorStr(QLatin1String(QT_TRANSLATE_NOOP("QHostInfo", "Unknown error")))
+    {
+    }
+
+    QHostInfo::HostInfoError err;
+    QString errorStr;
+    QList<QHostAddress> addrs;
+    QString hostName;
+    int lookupId;
+};
+
+QT_END_NAMESPACE
+
+#endif // QHOSTINFO_P_H