RIOT/cpu/cortex-m3_common/atomic_arch.c

/*
 * Copyright (C) 2014 Freie Universität Berlin
 *
 * 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     cpu_cortex-m3
 * @{
 *
 * @file        atomic_arch.c
 * @brief       Implementation of the kernels atomic interface
 *
 * @author      Stefan Pfeiffer <stefan.pfeiffer@fu-berlin.de>
 * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
 *
 * @}
 */

#include "arch/atomic_arch.h"
#include "irq.h"

unsigned int atomic_arch_set_return(unsigned int *to_set, unsigned int value)
{
    disableIRQ();
    unsigned int old = *to_set;
    *to_set = value;
    enableIRQ();
    return old;
}