Imported Upstream version 1.8.2upstream/1.8.2

1 files changed, 186 insertions, 0 deletions

diff --git a/qtools/qwaitcondition_win32.cpp b/qtools/qwaitcondition_win32.cpp
new file mode 100644
index 0000000..77eb039
--- /dev/null
+++ b/qtools/qwaitcondition_win32.cpp
@@ -0,0 +1,186 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** 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 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 http://www.qtsoftware.com/contact.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <windows.h>
+#include "qwaitcondition.h"
+#include "qmutex.h"
+#include "qlist.h"
+
+//***********************************************************************
+// QWaitConditionPrivate
+// **********************************************************************
+
+class QWaitConditionEvent
+{
+public:
+    QWaitConditionEvent() : priority(0), wokenUp(false)
+    {
+        event = CreateEvent(NULL, TRUE, FALSE, NULL);
+    }
+    ~QWaitConditionEvent() { CloseHandle(event); }
+    int priority;
+    bool wokenUp;
+    HANDLE event;
+};
+
+class EventQueue : public QList<QWaitConditionEvent>
+{
+  public:
+    EventQueue() { setAutoDelete(TRUE); }
+   ~EventQueue() {}
+};
+
+class QWaitConditionPrivate
+{
+public:
+    QMutex mtx;
+    EventQueue queue;
+    EventQueue freeQueue;
+
+    QWaitConditionEvent *pre();
+    void wait(QWaitConditionEvent *wce);
+    void post(QWaitConditionEvent *wce);
+};
+
+QWaitConditionEvent *QWaitConditionPrivate::pre()
+{
+    mtx.lock();
+    QWaitConditionEvent *wce =
+        freeQueue.isEmpty() ? new QWaitConditionEvent : freeQueue.take(0);
+    wce->priority = GetThreadPriority(GetCurrentThread());
+    wce->wokenUp = FALSE;
+
+    // insert 'wce' into the queue (sorted by priority)
+    uint index = 0;
+    for (; index < queue.count(); ++index)
+    {
+        QWaitConditionEvent *current = queue.at(index);
+        if (current->priority < wce->priority)
+            break;
+    }
+    queue.insert(index, wce);
+    mtx.unlock();
+
+    return wce;
+}
+
+void QWaitConditionPrivate::wait(QWaitConditionEvent *wce)
+{
+    WaitForSingleObject(wce->event, INFINITE);
+}
+
+void QWaitConditionPrivate::post(QWaitConditionEvent *wce)
+{
+    mtx.lock();
+
+    // remove 'wce' from the queue
+    int idx = queue.find(wce);
+    ASSERT(idx!=-1);
+    queue.take(idx);
+    ResetEvent(wce->event);
+    freeQueue.append(wce);
+
+    // wakeups delivered after the timeout should be forwarded to the next waiter
+    if (wce->wokenUp && !queue.isEmpty())
+    {
+        QWaitConditionEvent *other = queue.getFirst();
+        SetEvent(other->event);
+        other->wokenUp = TRUE;
+    }
+
+    mtx.unlock();
+}
+
+//***********************************************************************
+// QWaitCondition implementation
+//***********************************************************************
+
+QWaitCondition::QWaitCondition()
+{
+    d = new QWaitConditionPrivate;
+}
+
+QWaitCondition::~QWaitCondition()
+{
+    if (!d->queue.isEmpty())
+    {
+        qWarning("QWaitCondition: Destroyed while threads are still waiting");
+    }
+    delete d;
+}
+
+void QWaitCondition::wait(QMutex *mutex)
+{
+    if (!mutex) return;
+
+    QWaitConditionEvent *wce = d->pre();
+    mutex->unlock();
+    d->wait(wce);
+    mutex->lock();
+    d->post(wce);
+}
+
+void QWaitCondition::wakeOne()
+{
+    // wake up the first waiting thread in the queue
+    QMutexLocker locker(&d->mtx);
+    for (uint i = 0; i < d->queue.count(); ++i)
+    {
+        QWaitConditionEvent *current = d->queue.at(i);
+        if (current->wokenUp) continue;
+        SetEvent(current->event);
+        current->wokenUp = TRUE;
+        break;
+    }
+}
+
+void QWaitCondition::wakeAll()
+{
+    // wake up the all threads in the queue
+    QMutexLocker locker(&d->mtx);
+    for (uint i = 0; i < d->queue.count(); ++i) 
+    {
+        QWaitConditionEvent *current = d->queue.at(i);
+        SetEvent(current->event);
+        current->wokenUp = TRUE;
+    }
+}
+