RIOT/cpu/native/atomic_cpu.c

/**
 * Native CPU atomic.h implementation
 *
 * Copyright (C) 2013 Ludwig Ortmann
 *
 * This file subject to the terms and conditions of the GNU General Public
 * License. See the file LICENSE in the top level directory for more details.
 *
 * @ingroup arch
 * @{
 * @file
 * @author Ludwig Ortmann <ludwig.ortmann@fu-berlin.de>
 * @}
 */

#include <atomic.h>
#include <irq.h>
#include <debug.h>

unsigned int atomic_set_return(unsigned int* val, unsigned int set)
{
    unsigned int old_val;
    unsigned int old_state;

    DEBUG("atomic_set_return\n");

    old_state = disableIRQ();

    old_val = *val;
    *val = set;

    restoreIRQ(old_state);

    return old_val;
}