You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
52 lines
1.4 KiB
C
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
|