40 lines
1009 B
C++
40 lines
1009 B
C++
/*
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* \brief Atomic operations for ARM
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* \author Norman Feske
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* \date 2007-04-28
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*/
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/*
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* Copyright (C) 2007-2012 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _INCLUDE__ARM__CPU__ATOMIC_H_
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#define _INCLUDE__ARM__CPU__ATOMIC_H_
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namespace Genode {
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extern "C" long int
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l4_atomic_cmpxchg(volatile long int*, long int, long int);
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/**
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* Atomic compare and exchange
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*
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* This function compares the value at dest with cmp_val.
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* If both values are equal, dest is set to new_val. If
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* both values are different, the value at dest remains
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* unchanged.
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*
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* \return 1 if the value was successfully changed to new_val,
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* 0 if cmp_val and the value at dest differ.
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*/
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inline int cmpxchg(volatile int *dest, int cmp_val, int new_val)
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{
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return l4_atomic_cmpxchg((volatile long int *)dest, cmp_val, new_val);
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}
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}
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#endif /* _INCLUDE__ARM__CPU__ATOMIC_H_ */
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