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52 lines
1.4 KiB
C

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 2; tab-width: 2 -*- */
/*
* cas.c
* Copyright (C) 2015 Alexander Vdolainen <avdolainen@gmail.com>
*
* libtdata is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 2.1 of the License, or
* (at your option) any later version.
*
* libtdata is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.";
*/
#include <stdlib.h>
#include <stdint.h>
#include "../config.h"
#if !defined (HAVE__SYNC_BOOL_COMPARE_AND_SWAP_8)
#include <pthread.h>
static pthread_mutex_t __sync_lock = PTHREAD_MUTEX_INITIALIZER;
#endif
#ifndef HAVE__SYNC_BOOL_COMPARE_AND_SWAP_8
_Bool __sync_bool_compare_and_swap_8 (uint64_t*, uint64_t, uint64_t)
__attribute__ ((visibility ("hidden")));
_Bool __sync_bool_compare_and_swap_8 (uint64_t* ptr, uint64_t old, uint64_t new)
{
int i;
_Bool ret;
i = pthread_mutex_lock(&__sync_lock);
if(*ptr != old) ret = 0;
else {
*ptr = new;
ret = 1;
}
i = pthread_mutex_unlock(&__sync_lock);
return ret;
}
#endif