diff options
Diffstat (limited to 'src/corelib/arch/sparc/qatomic_sparc.cpp')
-rw-r--r-- | src/corelib/arch/sparc/qatomic_sparc.cpp | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/src/corelib/arch/sparc/qatomic_sparc.cpp b/src/corelib/arch/sparc/qatomic_sparc.cpp new file mode 100644 index 0000000000..bb411cd1f1 --- /dev/null +++ b/src/corelib/arch/sparc/qatomic_sparc.cpp @@ -0,0 +1,92 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (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 qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include <QtCore/qatomic.h> + +#include <limits.h> +#include <sched.h> + +extern "C" { + +int q_atomic_trylock_int(volatile int *addr); +int q_atomic_trylock_ptr(volatile void *addr); + +Q_CORE_EXPORT int q_atomic_lock_int(volatile int *addr) +{ + int returnValue = q_atomic_trylock_int(addr); + + if (returnValue == INT_MIN) { + do { + // spin until we think we can succeed + do { + sched_yield(); + returnValue = *addr; + } while (returnValue == INT_MIN); + + // try again + returnValue = q_atomic_trylock_int(addr); + } while (returnValue == INT_MIN); + } + + return returnValue; +} + +Q_CORE_EXPORT int q_atomic_lock_ptr(volatile void *addr) +{ + int returnValue = q_atomic_trylock_ptr(addr); + + if (returnValue == -1) { + do { + // spin until we think we can succeed + do { + sched_yield(); + returnValue = *reinterpret_cast<volatile int *>(addr); + } while (returnValue == -1); + + // try again + returnValue = q_atomic_trylock_ptr(addr); + } while (returnValue == -1); + } + + return returnValue; +} + +} // extern "C" |