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/*
* Copyright (C) 2014 Freie Universität Berlin
* Copyright (C) 2015 Eistec AB
*
* This file is subject to the terms and conditions of the GNU Lesser General
* Public License v2.1. See the file LICENSE in the top level directory for more
* details.
*/
/**
* @ingroup core_util
* @{
*
* @file
* @brief Generic implementation of the kernel's atomic interface
*
* @author Kaspar Schleiser <kaspar@schleiser.de>
* @author Oliver Hahm <oliver.hahm@inria.fr>
* @author Joakim Nohlgård <joakim.nohlgard@eistec.se>
*
* @}
*/
#include "irq.h"
#include "cpu.h"
#include "atomic.h"
/* Set ARCH_HAS_ATOMIC_COMPARE_AND_SWAP within cpu.h to override this function */
#if (ARCH_HAS_ATOMIC_COMPARE_AND_SWAP == 0)
int atomic_cas(atomic_int_t *var, int old, int now)
{
unsigned int mask = irq_disable();
if (ATOMIC_VALUE(*var) != old) {
irq_restore(mask);
return 0;
}
ATOMIC_VALUE(*var) = now;
irq_restore(mask);
return 1;
}
#endif
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