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。 .
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/* Copyright (C) 2013-2018 Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.

GCC 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 General Public License for more details.

Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
<http://www.gnu.org/licenses/>.  */

/* ISO C11 Standard:  7.17  Atomics <stdatomic.h>.  */

#ifndef _STDATOMIC_H
#define _STDATOMIC_H

typedef enum
  {
    memory_order_relaxed = __ATOMIC_RELAXED,
    memory_order_consume = __ATOMIC_CONSUME,
    memory_order_acquire = __ATOMIC_ACQUIRE,
    memory_order_release = __ATOMIC_RELEASE,
    memory_order_acq_rel = __ATOMIC_ACQ_REL,
    memory_order_seq_cst = __ATOMIC_SEQ_CST
  } memory_order;


typedef _Atomic _Bool atomic_bool;
typedef _Atomic char atomic_char;
typedef _Atomic signed char atomic_schar;
typedef _Atomic unsigned char atomic_uchar;
typedef _Atomic short atomic_short;
typedef _Atomic unsigned short atomic_ushort;
typedef _Atomic int atomic_int;
typedef _Atomic unsigned int atomic_uint;
typedef _Atomic long atomic_long;
typedef _Atomic unsigned long atomic_ulong;
typedef _Atomic long long atomic_llong;
typedef _Atomic unsigned long long atomic_ullong;
typedef _Atomic __CHAR16_TYPE__ atomic_char16_t;
typedef _Atomic __CHAR32_TYPE__ atomic_char32_t;
typedef _Atomic __WCHAR_TYPE__ atomic_wchar_t;
typedef _Atomic __INT_LEAST8_TYPE__ atomic_int_least8_t;
typedef _Atomic __UINT_LEAST8_TYPE__ atomic_uint_least8_t;
typedef _Atomic __INT_LEAST16_TYPE__ atomic_int_least16_t;
typedef _Atomic __UINT_LEAST16_TYPE__ atomic_uint_least16_t;
typedef _Atomic __INT_LEAST32_TYPE__ atomic_int_least32_t;
typedef _Atomic __UINT_LEAST32_TYPE__ atomic_uint_least32_t;
typedef _Atomic __INT_LEAST64_TYPE__ atomic_int_least64_t;
typedef _Atomic __UINT_LEAST64_TYPE__ atomic_uint_least64_t;
typedef _Atomic __INT_FAST8_TYPE__ atomic_int_fast8_t;
typedef _Atomic __UINT_FAST8_TYPE__ atomic_uint_fast8_t;
typedef _Atomic __INT_FAST16_TYPE__ atomic_int_fast16_t;
typedef _Atomic __UINT_FAST16_TYPE__ atomic_uint_fast16_t;
typedef _Atomic __INT_FAST32_TYPE__ atomic_int_fast32_t;
typedef _Atomic __UINT_FAST32_TYPE__ atomic_uint_fast32_t;
typedef _Atomic __INT_FAST64_TYPE__ atomic_int_fast64_t;
typedef _Atomic __UINT_FAST64_TYPE__ atomic_uint_fast64_t;
typedef _Atomic __INTPTR_TYPE__ atomic_intptr_t;
typedef _Atomic __UINTPTR_TYPE__ atomic_uintptr_t;
typedef _Atomic __SIZE_TYPE__ atomic_size_t;
typedef _Atomic __PTRDIFF_TYPE__ atomic_ptrdiff_t;
typedef _Atomic __INTMAX_TYPE__ atomic_intmax_t;
typedef _Atomic __UINTMAX_TYPE__ atomic_uintmax_t;        


#define ATOMIC_VAR_INIT(VALUE)	(VALUE)

/* Initialize an atomic object pointed to by PTR with VAL.  */
#define atomic_init(PTR, VAL)                           \
  atomic_store_explicit (PTR, VAL, __ATOMIC_RELAXED)

#define kill_dependency(Y)			\
  __extension__					\
  ({						\
    __auto_type __kill_dependency_tmp = (Y);	\
    __kill_dependency_tmp;			\
  })

extern void atomic_thread_fence (memory_order);
#define atomic_thread_fence(MO)	__atomic_thread_fence (MO)
extern void atomic_signal_fence (memory_order);
#define atomic_signal_fence(MO)	__atomic_signal_fence  (MO)
#define atomic_is_lock_free(OBJ) __atomic_is_lock_free (sizeof (*(OBJ)), (OBJ))

#define ATOMIC_BOOL_LOCK_FREE		__GCC_ATOMIC_BOOL_LOCK_FREE
#define ATOMIC_CHAR_LOCK_FREE		__GCC_ATOMIC_CHAR_LOCK_FREE
#define ATOMIC_CHAR16_T_LOCK_FREE	__GCC_ATOMIC_CHAR16_T_LOCK_FREE
#define ATOMIC_CHAR32_T_LOCK_FREE	__GCC_ATOMIC_CHAR32_T_LOCK_FREE
#define ATOMIC_WCHAR_T_LOCK_FREE	__GCC_ATOMIC_WCHAR_T_LOCK_FREE
#define ATOMIC_SHORT_LOCK_FREE		__GCC_ATOMIC_SHORT_LOCK_FREE
#define ATOMIC_INT_LOCK_FREE		__GCC_ATOMIC_INT_LOCK_FREE
#define ATOMIC_LONG_LOCK_FREE		__GCC_ATOMIC_LONG_LOCK_FREE
#define ATOMIC_LLONG_LOCK_FREE		__GCC_ATOMIC_LLONG_LOCK_FREE
#define ATOMIC_POINTER_LOCK_FREE	__GCC_ATOMIC_POINTER_LOCK_FREE


/* Note that these macros require __typeof__ and __auto_type to remove
   _Atomic qualifiers (and const qualifiers, if those are valid on
   macro operands).
   
   Also note that the header file uses the generic form of __atomic
   builtins, which requires the address to be taken of the value
   parameter, and then we pass that value on.  This allows the macros
   to work for any type, and the compiler is smart enough to convert
   these to lock-free _N variants if possible, and throw away the
   temps.  */

#define atomic_store_explicit(PTR, VAL, MO)				\
  __extension__								\
  ({									\
    __auto_type __atomic_store_ptr = (PTR);				\
    __typeof__ (*__atomic_store_ptr) __atomic_store_tmp = (VAL);	\
    __atomic_store (__atomic_store_ptr, &__atomic_store_tmp, (MO));	\
  })

#define atomic_store(PTR, VAL)				\
  atomic_store_explicit (PTR, VAL, __ATOMIC_SEQ_CST)


#define atomic_load_explicit(PTR, MO)					\
  __extension__								\
  ({									\
    __auto_type __atomic_load_ptr = (PTR);				\
    __typeof__ (*__atomic_load_ptr) __atomic_load_tmp;			\
    __atomic_load (__atomic_load_ptr, &__atomic_load_tmp, (MO));	\
    __atomic_load_tmp;							\
  })

#define atomic_load(PTR)  atomic_load_explicit (PTR, __ATOMIC_SEQ_CST)


#define atomic_exchange_explicit(PTR, VAL, MO)				\
  __extension__								\
  ({									\
    __auto_type __atomic_exchange_ptr = (PTR);				\
    __typeof__ (*__atomic_exchange_ptr) __atomic_exchange_val = (VAL);	\
    __typeof__ (*__atomic_exchange_ptr) __atomic_exchange_tmp;		\
    __atomic_exchange (__atomic_exchange_ptr, &__atomic_exchange_val,	\
		       &__atomic_exchange_tmp, (MO));			\
    __atomic_exchange_tmp;						\
  })

#define atomic_exchange(PTR, VAL) 			\
  atomic_exchange_explicit (PTR, VAL, __ATOMIC_SEQ_CST)


#define atomic_compare_exchange_strong_explicit(PTR, VAL, DES, SUC, FAIL) \
  __extension__								\
  ({									\
    __auto_type __atomic_compare_exchange_ptr = (PTR);			\
    __typeof__ (*__atomic_compare_exchange_ptr) __atomic_compare_exchange_tmp \
      = (DES);								\
    __atomic_compare_exchange (__atomic_compare_exchange_ptr, (VAL),	\
			       &__atomic_compare_exchange_tmp, 0,	\
			       (SUC), (FAIL));				\
  })

#define atomic_compare_exchange_strong(PTR, VAL, DES) 			   \
  atomic_compare_exchange_strong_explicit (PTR, VAL, DES, __ATOMIC_SEQ_CST, \
					   __ATOMIC_SEQ_CST)

#define atomic_compare_exchange_weak_explicit(PTR, VAL, DES, SUC, FAIL) \
  __extension__								\
  ({									\
    __auto_type __atomic_compare_exchange_ptr = (PTR);			\
    __typeof__ (*__atomic_compare_exchange_ptr) __atomic_compare_exchange_tmp \
      = (DES);								\
    __atomic_compare_exchange (__atomic_compare_exchange_ptr, (VAL),	\
			       &__atomic_compare_exchange_tmp, 1,	\
			       (SUC), (FAIL));				\
  })

#define atomic_compare_exchange_weak(PTR, VAL, DES)			\
  atomic_compare_exchange_weak_explicit (PTR, VAL, DES, __ATOMIC_SEQ_CST, \
					 __ATOMIC_SEQ_CST)



#define atomic_fetch_add(PTR, VAL) __atomic_fetch_add ((PTR), (VAL), 	\
						       __ATOMIC_SEQ_CST)
#define atomic_fetch_add_explicit(PTR, VAL, MO) 			\
			  __atomic_fetch_add ((PTR), (VAL), (MO))

#define atomic_fetch_sub(PTR, VAL) __atomic_fetch_sub ((PTR), (VAL), 	\
						       __ATOMIC_SEQ_CST)
#define atomic_fetch_sub_explicit(PTR, VAL, MO) 			\
			  __atomic_fetch_sub ((PTR), (VAL), (MO))

#define atomic_fetch_or(PTR, VAL) __atomic_fetch_or ((PTR), (VAL), 	\
						       __ATOMIC_SEQ_CST)
#define atomic_fetch_or_explicit(PTR, VAL, MO) 			\
			  __atomic_fetch_or ((PTR), (VAL), (MO))

#define atomic_fetch_xor(PTR, VAL) __atomic_fetch_xor ((PTR), (VAL), 	\
						       __ATOMIC_SEQ_CST)
#define atomic_fetch_xor_explicit(PTR, VAL, MO) 			\
			  __atomic_fetch_xor ((PTR), (VAL), (MO))

#define atomic_fetch_and(PTR, VAL) __atomic_fetch_and ((PTR), (VAL), 	\
						       __ATOMIC_SEQ_CST)
#define atomic_fetch_and_explicit(PTR, VAL, MO) 			\
			  __atomic_fetch_and ((PTR), (VAL), (MO))


typedef _Atomic struct
{
#if __GCC_ATOMIC_TEST_AND_SET_TRUEVAL == 1
  _Bool __val;
#else
  unsigned char __val;
#endif
} atomic_flag;

#define ATOMIC_FLAG_INIT	{ 0 }


extern _Bool atomic_flag_test_and_set (volatile atomic_flag *);
#define atomic_flag_test_and_set(PTR) 					\
			__atomic_test_and_set ((PTR), __ATOMIC_SEQ_CST)
extern _Bool atomic_flag_test_and_set_explicit (volatile atomic_flag *,
						memory_order);
#define atomic_flag_test_and_set_explicit(PTR, MO)			\
			__atomic_test_and_set ((PTR), (MO))

extern void atomic_flag_clear (volatile atomic_flag *);
#define atomic_flag_clear(PTR)	__atomic_clear ((PTR), __ATOMIC_SEQ_CST)
extern void atomic_flag_clear_explicit (volatile atomic_flag *, memory_order);
#define atomic_flag_clear_explicit(PTR, MO)   __atomic_clear ((PTR), (MO))

#endif  /* _STDATOMIC_H */

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