1 files changed, 209 insertions, 0 deletions
diff --git a/src/corelib/thread/qmutex_unix.cpp b/src/corelib/thread/qmutex_unix.cpp
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index 0000000000..11e20604e2
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+++ b/src/corelib/thread/qmutex_unix.cpp
@@ -0,0 +1,209 @@
+/****************************************************************************
+**
+** 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 "qmutex.h"
+#include "qstring.h"
+
+#ifndef QT_NO_THREAD
+#include "qatomic.h"
+#include "qmutex_p.h"
+
+#include <errno.h>
+
+#if defined(Q_OS_VXWORKS) && defined(wakeup)
+#undef wakeup
+#endif
+
+#if defined(Q_OS_MAC)
+# include <mach/mach.h>
+# include <mach/task.h>
+#elif defined(Q_OS_LINUX)
+# include <linux/futex.h>
+# include <sys/syscall.h>
+# include <unistd.h>
+#endif
+
+QT_BEGIN_NAMESPACE
+
+#if !defined(Q_OS_MAC) && !defined(Q_OS_LINUX)
+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)));
+}
+#endif
+
+
+QMutexPrivate::QMutexPrivate(QMutex::RecursionMode mode)
+    : QMutexData(mode), maximumSpinTime(MaximumSpinTimeThreshold), averageWaitTime(0), owner(0), count(0)
+{
+#if defined(Q_OS_MAC)
+    kern_return_t r = semaphore_create(mach_task_self(), &mach_semaphore, SYNC_POLICY_FIFO, 0);
+    if (r != KERN_SUCCESS)
+        qWarning("QMutex: failed to create semaphore, error %d", r);
+#elif !defined(Q_OS_LINUX)
+    wakeup = false;
+    report_error(pthread_mutex_init(&mutex, NULL), "QMutex", "mutex init");
+    report_error(pthread_cond_init(&cond, NULL), "QMutex", "cv init");
+#endif
+}
+
+QMutexPrivate::~QMutexPrivate()
+{
+#if defined(Q_OS_MAC)
+    kern_return_t r = semaphore_destroy(mach_task_self(), mach_semaphore);
+    if (r != KERN_SUCCESS)
+        qWarning("QMutex: failed to destroy semaphore, error %d", r);
+#elif !defined(Q_OS_LINUX)
+    report_error(pthread_cond_destroy(&cond), "QMutex", "cv destroy");
+    report_error(pthread_mutex_destroy(&mutex), "QMutex", "mutex destroy");
+#endif
+}
+
+#if defined(Q_OS_MAC)
+
+bool QMutexPrivate::wait(int timeout)
+{
+    if (contenders.fetchAndAddAcquire(1) == 0) {
+        // lock acquired without waiting
+        return true;
+    }
+    bool returnValue;
+    if (timeout < 0) {
+        returnValue = semaphore_wait(mach_semaphore) == KERN_SUCCESS;
+    } else {
+        mach_timespec_t ts;
+        ts.tv_nsec = ((timeout % 1000) * 1000) * 1000;
+        ts.tv_sec = (timeout / 1000);
+        kern_return_t r = semaphore_timedwait(mach_semaphore, ts);
+        returnValue = r == KERN_SUCCESS;
+    }
+    contenders.deref();
+    return returnValue;
+}
+
+void QMutexPrivate::wakeUp()
+{
+    semaphore_signal(mach_semaphore);
+}
+
+#elif defined(Q_OS_LINUX)
+
+static inline int _q_futex(volatile int *addr, int op, int val, const struct timespec *timeout, int *addr2, int val2)
+{
+    return syscall(SYS_futex, addr, op, val, timeout, addr2, val2);
+}
+
+bool QMutexPrivate::wait(int timeout)
+{
+    while (contenders.fetchAndStoreAcquire(2) > 0) {
+        struct timespec ts, *pts = 0;
+        if (timeout >= 0) {
+            ts.tv_nsec = ((timeout % 1000) * 1000) * 1000;
+            ts.tv_sec = (timeout / 1000);
+            pts = &ts;
+        }
+        int r = _q_futex(&contenders._q_value, FUTEX_WAIT, 2, pts, 0, 0);
+        if (r != 0 && errno == ETIMEDOUT)
+            return false;
+    }
+    return true;
+}
+
+void QMutexPrivate::wakeUp()
+{
+    (void) contenders.fetchAndStoreRelease(0);
+    (void) _q_futex(&contenders._q_value, FUTEX_WAKE, 1, 0, 0, 0);
+}
+
+#else // !Q_OS_MAC && !Q_OS_LINUX
+
+bool QMutexPrivate::wait(int timeout)
+{
+    if (contenders.fetchAndAddAcquire(1) == 0) {
+        // lock acquired without waiting
+        return true;
+    }
+    report_error(pthread_mutex_lock(&mutex), "QMutex::lock", "mutex lock");
+    int errorCode = 0;
+    while (!wakeup) {
+        if (timeout < 0) {
+            errorCode = pthread_cond_wait(&cond, &mutex);
+        } else {
+            struct timeval tv;
+            gettimeofday(&tv, 0);
+
+            timespec ti;
+            ti.tv_nsec = (tv.tv_usec + (timeout % 1000) * 1000) * 1000;
+            ti.tv_sec = tv.tv_sec + (timeout / 1000) + (ti.tv_nsec / 1000000000);
+            ti.tv_nsec %= 1000000000;
+
+            errorCode = pthread_cond_timedwait(&cond, &mutex, &ti);
+        }
+        if (errorCode) {
+            if (errorCode == ETIMEDOUT) {
+                if (wakeup)
+                    errorCode = 0;
+                break;
+            }
+            report_error(errorCode, "QMutex::lock()", "cv wait");
+        }
+    }
+    wakeup = false;
+    report_error(pthread_mutex_unlock(&mutex), "QMutex::lock", "mutex unlock");
+    contenders.deref();
+    return errorCode == 0;
+}
+
+void QMutexPrivate::wakeUp()
+{
+    report_error(pthread_mutex_lock(&mutex), "QMutex::unlock", "mutex lock");
+    wakeup = true;
+    report_error(pthread_cond_signal(&cond), "QMutex::unlock", "cv signal");
+    report_error(pthread_mutex_unlock(&mutex), "QMutex::unlock", "mutex unlock");
+}
+
+#endif // !Q_OS_MAC && !Q_OS_LINUX
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_THREAD