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

1 files changed, 233 insertions, 0 deletions

diff --git a/src/corelib/thread/qwaitcondition_win.cpp b/src/corelib/thread/qwaitcondition_win.cpp
new file mode 100644
index 0000000000..ee1c7ba01f
--- /dev/null
+++ b/src/corelib/thread/qwaitcondition_win.cpp
@@ -0,0 +1,233 @@
+/****************************************************************************
+**
+** 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 "qwaitcondition.h"
+#include "qnamespace.h"
+#include "qmutex.h"
+#include "qreadwritelock.h"
+#include "qlist.h"
+#include "qalgorithms.h"
+#include "qt_windows.h"
+
+#ifndef QT_NO_THREAD
+
+#define Q_MUTEX_T void*
+#include <private/qmutex_p.h>
+#include <private/qreadwritelock_p.h>
+
+QT_BEGIN_NAMESPACE
+
+//***********************************************************************
+// QWaitConditionPrivate
+// **********************************************************************
+
+class QWaitConditionEvent
+{
+public:
+    inline QWaitConditionEvent() : priority(0), wokenUp(false)
+    {
+        event = CreateEvent(NULL, TRUE, FALSE, NULL);
+    }
+    inline ~QWaitConditionEvent() { CloseHandle(event); }
+    int priority;
+    bool wokenUp;
+    HANDLE event;
+};
+
+typedef QList<QWaitConditionEvent *> EventQueue;
+
+class QWaitConditionPrivate
+{
+public:
+    QMutex mtx;
+    EventQueue queue;
+    EventQueue freeQueue;
+
+    QWaitConditionEvent *pre();
+    bool wait(QWaitConditionEvent *wce, unsigned long time);
+    void post(QWaitConditionEvent *wce, bool ret);
+};
+
+QWaitConditionEvent *QWaitConditionPrivate::pre()
+{
+    mtx.lock();
+    QWaitConditionEvent *wce =
+        freeQueue.isEmpty() ? new QWaitConditionEvent : freeQueue.takeFirst();
+    wce->priority = GetThreadPriority(GetCurrentThread());
+    wce->wokenUp = false;
+
+    // insert 'wce' into the queue (sorted by priority)
+    int index = 0;
+    for (; index < queue.size(); ++index) {
+        QWaitConditionEvent *current = queue.at(index);
+        if (current->priority < wce->priority)
+            break;
+    }
+    queue.insert(index, wce);
+    mtx.unlock();
+
+    return wce;
+}
+
+bool QWaitConditionPrivate::wait(QWaitConditionEvent *wce, unsigned long time)
+{
+    // wait for the event
+    bool ret = false;
+    switch (WaitForSingleObject(wce->event, time)) {
+    default: break;
+
+    case WAIT_OBJECT_0:
+        ret = true;
+        break;
+    }
+    return ret;
+}
+
+void QWaitConditionPrivate::post(QWaitConditionEvent *wce, bool ret)
+{
+    mtx.lock();
+
+    // remove 'wce' from the queue
+    queue.removeAll(wce);
+    ResetEvent(wce->event);
+    freeQueue.append(wce);
+
+    // wakeups delivered after the timeout should be forwarded to the next waiter
+    if (!ret && wce->wokenUp && !queue.isEmpty()) {
+        QWaitConditionEvent *other = queue.first();
+        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");
+        qDeleteAll(d->queue);
+    }
+
+    qDeleteAll(d->freeQueue);
+    delete d;
+}
+
+bool QWaitCondition::wait(QMutex *mutex, unsigned long time)
+{
+    if (!mutex)
+        return false;
+    if (mutex->d->recursive) {
+        qWarning("QWaitCondition::wait: Cannot wait on recursive mutexes");
+        return false;
+    }
+
+    QWaitConditionEvent *wce = d->pre();
+    mutex->unlock();
+
+    bool returnValue = d->wait(wce, time);
+
+    mutex->lock();
+    d->post(wce, returnValue);
+
+    return returnValue;
+}
+
+bool QWaitCondition::wait(QReadWriteLock *readWriteLock, unsigned long time)
+{
+    if (!readWriteLock || readWriteLock->d->accessCount == 0)
+        return false;
+    if (readWriteLock->d->accessCount < -1) {
+        qWarning("QWaitCondition: cannot wait on QReadWriteLocks with recursive lockForWrite()");
+        return false;
+    }
+
+    QWaitConditionEvent *wce = d->pre();
+    int previousAccessCount = readWriteLock->d->accessCount;
+    readWriteLock->unlock();
+
+    bool returnValue = d->wait(wce, time);
+
+    if (previousAccessCount < 0)
+        readWriteLock->lockForWrite();
+    else
+        readWriteLock->lockForRead();
+    d->post(wce, returnValue);
+
+    return returnValue;
+}
+
+void QWaitCondition::wakeOne()
+{
+    // wake up the first waiting thread in the queue
+    QMutexLocker locker(&d->mtx);
+    for (int i = 0; i < d->queue.size(); ++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 (int i = 0; i < d->queue.size(); ++i) {
+        QWaitConditionEvent *current = d->queue.at(i);
+        SetEvent(current->event);
+        current->wokenUp = true;
+    }
+}
+
+QT_END_NAMESPACE
+#endif // QT_NO_THREAD