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

1 files changed, 192 insertions, 0 deletions

diff --git a/src/corelib/thread/qwaitcondition_unix.cpp b/src/corelib/thread/qwaitcondition_unix.cpp
new file mode 100644
index 0000000000..d0f23b5342
--- /dev/null
+++ b/src/corelib/thread/qwaitcondition_unix.cpp
@@ -0,0 +1,192 @@
+/****************************************************************************
+**
+** 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 "qplatformdefs.h"
+#include "qwaitcondition.h"
+#include "qmutex.h"
+#include "qreadwritelock.h"
+#include "qatomic.h"
+#include "qstring.h"
+
+#include "qmutex_p.h"
+#include "qreadwritelock_p.h"
+
+#include <errno.h>
+
+#ifndef QT_NO_THREAD
+
+QT_BEGIN_NAMESPACE
+
+static void report_error(int code, const char *where, const char *what)
+{
+    if (code != 0)
+        qWarning("%s: %s failure: %s", where, what, qPrintable(qt_error_string(code)));
+}
+
+class QWaitConditionPrivate {
+public:
+    pthread_mutex_t mutex;
+    pthread_cond_t cond;
+    int waiters;
+    int wakeups;
+
+    bool wait(unsigned long time)
+    {
+        int code;
+        forever {
+            if (time != ULONG_MAX) {
+                struct timeval tv;
+                gettimeofday(&tv, 0);
+
+                timespec ti;
+                ti.tv_nsec = (tv.tv_usec + (time % 1000) * 1000) * 1000;
+                ti.tv_sec = tv.tv_sec + (time / 1000) + (ti.tv_nsec / 1000000000);
+                ti.tv_nsec %= 1000000000;
+
+                code = pthread_cond_timedwait(&cond, &mutex, &ti);
+            } else {
+                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;
+        }
+
+        Q_ASSERT_X(waiters > 0, "QWaitCondition::wait", "internal error (waiters)");
+        --waiters;
+        if (code == 0) {
+            Q_ASSERT_X(wakeups > 0, "QWaitCondition::wait", "internal error (wakeups)");
+            --wakeups;
+        }
+        report_error(pthread_mutex_unlock(&mutex), "QWaitCondition::wait()", "mutex unlock");
+
+        if (code && code != ETIMEDOUT)
+            report_error(code, "QWaitCondition::wait()", "cv wait");
+
+        return (code == 0);
+    }
+};
+
+
+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 = qMin(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");
+}
+
+bool QWaitCondition::wait(QMutex *mutex, unsigned long time)
+{
+    if (! mutex)
+        return false;
+    if (mutex->d->recursive) {
+        qWarning("QWaitCondition: cannot wait on recursive mutexes");
+        return false;
+    }
+
+    report_error(pthread_mutex_lock(&d->mutex), "QWaitCondition::wait()", "mutex lock");
+    ++d->waiters;
+    mutex->unlock();
+
+    bool returnValue = d->wait(time);
+
+    mutex->lock();
+
+    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;
+    }
+
+    report_error(pthread_mutex_lock(&d->mutex), "QWaitCondition::wait()", "mutex lock");
+    ++d->waiters;
+
+    int previousAccessCount = readWriteLock->d->accessCount;
+    readWriteLock->unlock();
+
+    bool returnValue = d->wait(time);
+
+    if (previousAccessCount < 0)
+        readWriteLock->lockForWrite();
+    else
+        readWriteLock->lockForRead();
+
+    return returnValue;
+}
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_THREAD