1 files changed, 134 insertions, 0 deletions
diff --git a/qtools/qwaitcondition_unix.cpp b/qtools/qwaitcondition_unix.cpp
new file mode 100644
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--- /dev/null
+++ b/qtools/qwaitcondition_unix.cpp
@@ -0,0 +1,134 @@
+/****************************************************************************
+**
+** 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 "qwaitcondition.h"
+#include "qmutex.h"
+#include <pthread.h>
+
+#define MIN(a,b) ((a)<(b)?(a):(b))
+
+static void report_error(int code, const char *where, const char *what)
+{
+    if (code != 0)
+        qWarning("%s: %s failure: %d", where, what, code);
+}
+
+class QWaitConditionPrivate
+{
+  public:
+    pthread_mutex_t mutex;
+    pthread_cond_t cond;
+    int waiters;
+    int wakeups;
+
+    void wait()
+    {
+        int code;
+        for (;;)
+        {
+            code = pthread_cond_wait(&cond, &mutex);
+            if (code == 0 && wakeups == 0) 
+            {
+                // many vendors warn of spurios wakeups from
+                // pthread_cond_wait(), especially after signal delivery,
+                // even though POSIX doesn't allow for it... sigh
+                continue;
+            }
+            break;
+        }
+
+        --waiters;
+        if (code == 0)
+        {
+            --wakeups;
+        }
+        else
+        {
+            report_error(code, "QWaitCondition::wait()", "cv wait");
+        }
+        report_error(pthread_mutex_unlock(&mutex), "QWaitCondition::wait()", "mutex unlock");
+    }
+};
+
+
+QWaitCondition::QWaitCondition()
+{
+    d = new QWaitConditionPrivate;
+    report_error(pthread_mutex_init(&d->mutex, NULL), "QWaitCondition", "mutex init");
+    report_error(pthread_cond_init(&d->cond, NULL), "QWaitCondition", "cv init");
+    d->waiters = d->wakeups = 0;
+}
+
+
+QWaitCondition::~QWaitCondition()
+{
+    report_error(pthread_cond_destroy(&d->cond), "QWaitCondition", "cv destroy");
+    report_error(pthread_mutex_destroy(&d->mutex), "QWaitCondition", "mutex destroy");
+    delete d;
+}
+
+void QWaitCondition::wakeOne()
+{
+    report_error(pthread_mutex_lock(&d->mutex), "QWaitCondition::wakeOne()", "mutex lock");
+    d->wakeups = MIN(d->wakeups + 1, d->waiters);
+    report_error(pthread_cond_signal(&d->cond), "QWaitCondition::wakeOne()", "cv signal");
+    report_error(pthread_mutex_unlock(&d->mutex), "QWaitCondition::wakeOne()", "mutex unlock");
+}
+
+void QWaitCondition::wakeAll()
+{
+    report_error(pthread_mutex_lock(&d->mutex), "QWaitCondition::wakeAll()", "mutex lock");
+    d->wakeups = d->waiters;
+    report_error(pthread_cond_broadcast(&d->cond), "QWaitCondition::wakeAll()", "cv broadcast");
+    report_error(pthread_mutex_unlock(&d->mutex), "QWaitCondition::wakeAll()", "mutex unlock");
+}
+
+void QWaitCondition::wait(QMutex *mutex)
+{
+    if (!mutex) return;
+
+    report_error(pthread_mutex_lock(&d->mutex), "QWaitCondition::wait()", "mutex lock");
+    ++d->waiters;
+    mutex->unlock();
+    d->wait();
+    mutex->lock();
+}
+