Add src/corelib/arch/qatomic_unix.h and qatomic_unix.cpp

This provides a fallback implementation on UNIX when the Q_PROCESSOR_*
and Q_CC_*/Q_COMPILER_* checks fail to find an implementation.

Note that we always compile qatomic_unix.cpp, but code is only included
when QATOMIC_UNIX_H is defined (meaning the checks above did not find an
implementation).

Change-Id: I8ce047847206003b4fa96eb3fb76b1c2ffbc2dfc
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

diff --git a/src/corelib/arch/arch.pri b/src/corelib/arch/arch.pri
index 2a4fddb..14e90b8 100644 (file)
--- a/src/corelib/arch/arch.pri
+++ b/src/corelib/arch/arch.pri
@@ -25,6 +25,12 @@ integrity:HEADERS += arch/qatomic_integrity.h
                        arch/qatomic_gcc.h \
                        arch/qatomic_cxx11.h
 
+unix {
+    # fallback implementation when no other appropriate qatomic_*.h exists
+    HEADERS += arch/qatomic_unix.h
+    SOURCES += arch/qatomic_unix.cpp
+}
+
 QT_ARCH_CPP = $$QT_SOURCE_TREE/src/corelib/arch/$$QT_ARCH
 exists($$QT_ARCH_CPP) {
     DEPENDPATH += $$QT_ARCH_CPP

diff --git a/src/corelib/arch/qatomic_unix.cpp b/src/corelib/arch/qatomic_unix.cpp
new file mode 100644 (file)
index 0000000..a709be3
--- /dev/null
+++ b/src/corelib/arch/qatomic_unix.cpp
@@ -0,0 +1,82 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** 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.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qplatformdefs.h"
+
+#include <QtCore/qatomic.h>
+
+// If operating system, processor, and compiler detection fails, we fall back
+// to this generic, out-of-line implementation
+
+#if defined(QATOMIC_UNIX_H)
+
+QT_BEGIN_NAMESPACE
+static pthread_mutex_t qAtomicMutex = PTHREAD_MUTEX_INITIALIZER;
+
+Q_CORE_EXPORT
+bool QAtomicOps<int>::testAndSetRelaxed(int &_q_value, int expectedValue, int newValue)
+{
+    bool returnValue = false;
+    pthread_mutex_lock(&qAtomicMutex);
+    if (_q_value == expectedValue) {
+        _q_value = newValue;
+        returnValue = true;
+    }
+    pthread_mutex_unlock(&qAtomicMutex);
+    return returnValue;
+}
+
+Q_CORE_EXPORT
+bool QAtomicOps<void *>::testAndSetRelaxed(void *&_q_value, void *expectedValue, void *newValue)
+{
+    bool returnValue = false;
+    pthread_mutex_lock(&qAtomicMutex);
+    if (_q_value == expectedValue) {
+        _q_value = newValue;
+        returnValue = true;
+    }
+    pthread_mutex_unlock(&qAtomicMutex);
+    return returnValue;
+}
+
+QT_END_NAMESPACE
+
+#endif // QATOMIC_UNIX_H

diff --git a/src/corelib/arch/qatomic_unix.h b/src/corelib/arch/qatomic_unix.h
new file mode 100644 (file)
index 0000000..3dc168c
--- /dev/null
+++ b/src/corelib/arch/qatomic_unix.h
@@ -0,0 +1,117 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** 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.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QATOMIC_UNIX_H
+#define QATOMIC_UNIX_H
+
+#include <QtCore/qgenericatomic.h>
+
+QT_BEGIN_HEADER
+QT_BEGIN_NAMESPACE
+
+#if 0
+// silence syncqt warnings
+QT_END_NAMESPACE
+QT_END_HEADER
+
+#pragma qt_sync_stop_processing
+#endif
+
+#define Q_ATOMIC_INT_REFERENCE_COUNTING_IS_NOT_NATIVE
+#define Q_ATOMIC_INT_TEST_AND_SET_IS_NOT_NATIVE
+#define Q_ATOMIC_INT_FETCH_AND_STORE_IS_NOT_NATIVE
+#define Q_ATOMIC_INT_FETCH_AND_ADD_IS_NOT_NATIVE
+
+#define Q_ATOMIC_INT32_IS_SUPPORTED
+
+#define Q_ATOMIC_POINTER_TEST_AND_SET_IS_NOT_NATIVE
+#define Q_ATOMIC_POINTER_FETCH_AND_STORE_IS_NOT_NATIVE
+#define Q_ATOMIC_POINTER_FETCH_AND_ADD_IS_NOT_NATIVE
+
+template<> struct QAtomicIntegerTraits<int> { enum { IsInteger = 1 }; };
+
+// No definition, needs specialization
+template <typename T> struct QAtomicOps;
+
+template <>
+struct QAtomicOps<int> : QGenericAtomicOps<QAtomicOps<int> >
+{
+    typedef int Type;
+
+    static inline bool isTestAndSetNative() { return false; }
+    static inline bool isTestAndSetWaitFree() { return false; }
+    Q_CORE_EXPORT static bool testAndSetRelaxed(int &_q_value, int expectedValue, int newValue);
+};
+
+template <>
+struct QAtomicOps<void *> : QGenericAtomicOps<QAtomicOps<void *> >
+{
+    typedef void *Type;
+
+    static inline bool isTestAndSetNative() { return false; }
+    static inline bool isTestAndSetWaitFree() { return false; }
+    Q_CORE_EXPORT static bool testAndSetRelaxed(void *&_q_value, void *expectedValue, void *newValue);
+};
+
+template <typename T>
+struct QAtomicOps<T *> : QGenericAtomicOps<QAtomicOps<T *> >
+{
+    typedef T *Type;
+
+    // helper to strip cv qualifiers
+    static inline void *nocv(const T *p) { return const_cast<void *>(static_cast<const volatile void *>(p)); }
+
+    static inline bool isTestAndSetNative() { return false; }
+    static inline bool isTestAndSetWaitFree() { return false; }
+    static inline bool testAndSetRelaxed(T *&_q_value, T *expectedValue, T *newValue)
+    {
+        // forward to the void* specialization
+        void *voidp = nocv(_q_value);
+        bool returnValue = QAtomicOps<void *>::testAndSetRelaxed(voidp, nocv(expectedValue), nocv(newValue));
+        _q_value = reinterpret_cast<T *>(voidp);
+        return returnValue;
+    }
+};
+
+QT_END_NAMESPACE
+QT_END_HEADER
+
+#endif // QATOMIC_UNIX_H

diff --git a/src/corelib/thread/qbasicatomic.h b/src/corelib/thread/qbasicatomic.h
index ba9e30b..363a4da 100644 (file)
--- a/src/corelib/thread/qbasicatomic.h
+++ b/src/corelib/thread/qbasicatomic.h
@@ -91,6 +91,10 @@
 #elif defined(Q_CC_GNU)
 #  include <QtCore/qatomic_gcc.h>
 
+// Fallback operating system dependent implementation
+#elif defined(Q_OS_UNIX)
+#  include <QtCore/qatomic_unix.h>
+
 // No fallback
 #else
 #  error "Qt has not been ported to this platform"