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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 -*- */
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/*
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* cas.c
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* Copyright (C) 2015 Alexander Vdolainen <avdolainen@gmail.com>
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*
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* libtdata is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* libtdata is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.";
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*/
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#include <stdlib.h>
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#include <stdint.h>
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#include "../config.h"
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#if !defined (HAVE__SYNC_BOOL_COMPARE_AND_SWAP_8)
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#include <pthread.h>
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static pthread_mutex_t __sync_lock = PTHREAD_MUTEX_INITIALIZER;
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#endif
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#ifndef HAVE__SYNC_BOOL_COMPARE_AND_SWAP_8
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_Bool __sync_bool_compare_and_swap_8 (uint64_t*, uint64_t, uint64_t)
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__attribute__ ((visibility ("hidden")));
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_Bool __sync_bool_compare_and_swap_8 (uint64_t* ptr, uint64_t old, uint64_t new)
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{
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int i;
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_Bool ret;
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i = pthread_mutex_lock(&__sync_lock);
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if(*ptr != old) ret = 0;
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else {
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*ptr = new;
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ret = 1;
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}
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i = pthread_mutex_unlock(&__sync_lock);
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return ret;
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}
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#endif
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