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