?? qatomic_arm.h
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/******************************************************************************** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.**** This file is part of the QtCore module of the Qt Toolkit.**** This file may be used under the terms of the GNU General Public** License version 2.0 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 GNU** General Public Licensing requirements will be met:** http://www.trolltech.com/products/qt/opensource.html**** If you are unsure which license is appropriate for your use, please** review the following information:** http://www.trolltech.com/products/qt/licensing.html or contact the** sales department at sales@trolltech.com.**** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.******************************************************************************/#ifndef ARM_QATOMIC_H#define ARM_QATOMIC_H#include <QtCore/qglobal.h>QT_BEGIN_HEADERextern Q_CORE_EXPORT char q_atomic_lock;inline char q_atomic_swp(volatile char *ptr, char newval){ register int ret; asm volatile("swpb %0,%1,[%2]" : "=&r"(ret) : "r"(newval), "r"(ptr) : "cc", "memory"); return ret;}inline int q_atomic_test_and_set_int(volatile int *ptr, int expected, int newval){ int ret = 0; while (q_atomic_swp(&q_atomic_lock, ~0) != 0); if (*ptr == expected) { *ptr = newval; ret = 1; } q_atomic_swp(&q_atomic_lock, 0); return ret;}inline int q_atomic_test_and_set_acquire_int(volatile int *ptr, int expected, int newval){ return q_atomic_test_and_set_int(ptr, expected, newval);}inline int q_atomic_test_and_set_release_int(volatile int *ptr, int expected, int newval){ return q_atomic_test_and_set_int(ptr, expected, newval);}inline int q_atomic_test_and_set_ptr(volatile void *ptr, void *expected, void *newval){ int ret = 0; while (q_atomic_swp(&q_atomic_lock, ~0) != 0) ; if (*reinterpret_cast<void * volatile *>(ptr) == expected) { *reinterpret_cast<void * volatile *>(ptr) = newval; ret = 1; } q_atomic_swp(&q_atomic_lock, 0); return ret;}inline int q_atomic_increment(volatile int *ptr){ while (q_atomic_swp(&q_atomic_lock, ~0) != 0) ; int originalValue = *ptr; *ptr = originalValue + 1; q_atomic_swp(&q_atomic_lock, 0); return originalValue != -1;}inline int q_atomic_decrement(volatile int *ptr){ while (q_atomic_swp(&q_atomic_lock, ~0) != 0) ; int originalValue = *ptr; *ptr = originalValue - 1; q_atomic_swp(&q_atomic_lock, 0); return originalValue != 1;}inline int q_atomic_set_int(volatile int *ptr, int newval){ while (q_atomic_swp(&q_atomic_lock, ~0) != 0) ; int originalValue = *ptr; *ptr = newval; q_atomic_swp(&q_atomic_lock, 0); return originalValue;}inline void *q_atomic_set_ptr(volatile void *ptr, void *newval){ while (q_atomic_swp(&q_atomic_lock, ~0) != 0) ; void *originalValue = *reinterpret_cast<void * volatile *>(ptr); *reinterpret_cast<void * volatile *>(ptr) = newval; q_atomic_swp(&q_atomic_lock, 0); return originalValue;}QT_END_HEADER#endif // ARM_QATOMIC_H
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