晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */

#pragma once

#ifdef ISC_MUTEX_ATOMICS
#include <isc/mutexatomic.h>
#else /* ifdef ISC_MUTEX_ATOMICS */
#if HAVE_STDATOMIC_H
#include <stdatomic.h>
#else /* if HAVE_STDATOMIC_H */
#include <isc/stdatomic.h>
#endif /* if HAVE_STDATOMIC_H */
#endif /* ifdef ISC_MUTEX_ATOMICS */

/*
 * We define a few additional macros to make things easier
 */

/* Relaxed Memory Ordering */

#define atomic_store_relaxed(o, v) \
	atomic_store_explicit((o), (v), memory_order_relaxed)
#define atomic_load_relaxed(o) atomic_load_explicit((o), memory_order_relaxed)
#define atomic_fetch_add_relaxed(o, v) \
	atomic_fetch_add_explicit((o), (v), memory_order_relaxed)
#define atomic_fetch_sub_relaxed(o, v) \
	atomic_fetch_sub_explicit((o), (v), memory_order_relaxed)
#define atomic_fetch_or_relaxed(o, v) \
	atomic_fetch_or_explicit((o), (v), memory_order_relaxed)
#define atomic_fetch_and_relaxed(o, v) \
	atomic_fetch_and_explicit((o), (v), memory_order_relaxed)
#define atomic_exchange_relaxed(o, v) \
	atomic_exchange_explicit((o), (v), memory_order_relaxed)
#define atomic_compare_exchange_weak_relaxed(o, e, d) \
	atomic_compare_exchange_weak_explicit(        \
		(o), (e), (d), memory_order_relaxed, memory_order_relaxed)
#define atomic_compare_exchange_strong_relaxed(o, e, d) \
	atomic_compare_exchange_strong_explicit(        \
		(o), (e), (d), memory_order_relaxed, memory_order_relaxed)
#define atomic_compare_exchange_strong_acq_rel(o, e, d) \
	atomic_compare_exchange_strong_explicit(        \
		(o), (e), (d), memory_order_acq_rel, memory_order_acquire)

/* Acquire-Release Memory Ordering */

#define atomic_store_release(o, v) \
	atomic_store_explicit((o), (v), memory_order_release)
#define atomic_load_acquire(o) atomic_load_explicit((o), memory_order_acquire)
#define atomic_fetch_add_release(o, v) \
	atomic_fetch_add_explicit((o), (v), memory_order_release)
#define atomic_fetch_sub_release(o, v) \
	atomic_fetch_sub_explicit((o), (v), memory_order_release)
#define atomic_fetch_and_release(o, v) \
	atomic_fetch_and_explicit((o), (v), memory_order_release)
#define atomic_fetch_or_release(o, v) \
	atomic_fetch_or_explicit((o), (v), memory_order_release)
#define atomic_exchange_acq_rel(o, v) \
	atomic_exchange_explicit((o), (v), memory_order_acq_rel)
#define atomic_fetch_sub_acq_rel(o, v) \
	atomic_fetch_sub_explicit((o), (v), memory_order_acq_rel)
#define atomic_compare_exchange_weak_acq_rel(o, e, d) \
	atomic_compare_exchange_weak_explicit(        \
		(o), (e), (d), memory_order_acq_rel, memory_order_acquire)
#define atomic_compare_exchange_strong_acq_rel(o, e, d) \
	atomic_compare_exchange_strong_explicit(        \
		(o), (e), (d), memory_order_acq_rel, memory_order_acquire)