include/atomic

// -*- C++ -*-
//===--------------------------- atomic -----------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP_ATOMIC
#define _LIBCPP_ATOMIC

/*
 atomic synopsis

namespace std
{

// order and consistency

typedef enum memory_order
{
 memory_order_relaxed,
 memory_order_consume, // load-consume
 memory_order_acquire, // load-acquire
 memory_order_release, // store-release
 memory_order_acq_rel, // store-release load-acquire
 memory_order_seq_cst // store-release load-acquire
} memory_order;

template <class T> T kill_dependency(T y) noexcept;

// lock-free property

#define ATOMIC_BOOL_LOCK_FREE unspecified
#define ATOMIC_CHAR_LOCK_FREE unspecified
#define ATOMIC_CHAR16_T_LOCK_FREE unspecified
#define ATOMIC_CHAR32_T_LOCK_FREE unspecified
#define ATOMIC_WCHAR_T_LOCK_FREE unspecified
#define ATOMIC_SHORT_LOCK_FREE unspecified
#define ATOMIC_INT_LOCK_FREE unspecified
#define ATOMIC_LONG_LOCK_FREE unspecified
#define ATOMIC_LLONG_LOCK_FREE unspecified
#define ATOMIC_POINTER_LOCK_FREE unspecified

// flag type and operations

typedef struct atomic_flag
{
 bool test_and_set(memory_order m = memory_order_seq_cst) volatile noexcept;
 bool test_and_set(memory_order m = memory_order_seq_cst) noexcept;
 void clear(memory_order m = memory_order_seq_cst) volatile noexcept;
 void clear(memory_order m = memory_order_seq_cst) noexcept;
 atomic_flag() noexcept = default;
 atomic_flag(const atomic_flag&) = delete;
 atomic_flag& operator=(const atomic_flag&) = delete;
 atomic_flag& operator=(const atomic_flag&) volatile = delete;
} atomic_flag;

bool
 atomic_flag_test_and_set(volatile atomic_flag* obj) noexcept;

bool
 atomic_flag_test_and_set(atomic_flag* obj) noexcept;

bool
 atomic_flag_test_and_set_explicit(volatile atomic_flag* obj,
 memory_order m) noexcept;

bool
 atomic_flag_test_and_set_explicit(atomic_flag* obj, memory_order m) noexcept;

void
 atomic_flag_clear(volatile atomic_flag* obj) noexcept;

void
 atomic_flag_clear(atomic_flag* obj) noexcept;

void
 atomic_flag_clear_explicit(volatile atomic_flag* obj, memory_order m) noexcept;

void
 atomic_flag_clear_explicit(atomic_flag* obj, memory_order m) noexcept;

#define ATOMIC_FLAG_INIT see below
#define ATOMIC_VAR_INIT(value) see below

template <class T>
struct atomic
{
 bool is_lock_free() const volatile noexcept;
 bool is_lock_free() const noexcept;
 void store(T desr, memory_order m = memory_order_seq_cst) volatile noexcept;
 void store(T desr, memory_order m = memory_order_seq_cst) noexcept;
 T load(memory_order m = memory_order_seq_cst) const volatile noexcept;
 T load(memory_order m = memory_order_seq_cst) const noexcept;
 operator T() const volatile noexcept;
 operator T() const noexcept;
 T exchange(T desr, memory_order m = memory_order_seq_cst) volatile noexcept;
 T exchange(T desr, memory_order m = memory_order_seq_cst) noexcept;
 bool compare_exchange_weak(T& expc, T desr,
 memory_order s, memory_order f) volatile noexcept;
 bool compare_exchange_weak(T& expc, T desr, memory_order s, memory_order f) noexcept;
 bool compare_exchange_strong(T& expc, T desr,
 memory_order s, memory_order f) volatile noexcept;
 bool compare_exchange_strong(T& expc, T desr,
 memory_order s, memory_order f) noexcept;
 bool compare_exchange_weak(T& expc, T desr,
 memory_order m = memory_order_seq_cst) volatile noexcept;
 bool compare_exchange_weak(T& expc, T desr,
 memory_order m = memory_order_seq_cst) noexcept;
 bool compare_exchange_strong(T& expc, T desr,
 memory_order m = memory_order_seq_cst) volatile noexcept;
 bool compare_exchange_strong(T& expc, T desr,
 memory_order m = memory_order_seq_cst) noexcept;

 atomic() noexcept = default;
 constexpr atomic(T desr) noexcept;
 atomic(const atomic&) = delete;
 atomic& operator=(const atomic&) = delete;
 atomic& operator=(const atomic&) volatile = delete;
 T operator=(T) volatile noexcept;
 T operator=(T) noexcept;
};

template <>
struct atomic<integral>
{
 bool is_lock_free() const volatile noexcept;
 bool is_lock_free() const noexcept;
 void store(integral desr, memory_order m = memory_order_seq_cst) volatile noexcept;
 void store(integral desr, memory_order m = memory_order_seq_cst) noexcept;
 integral load(memory_order m = memory_order_seq_cst) const volatile noexcept;
 integral load(memory_order m = memory_order_seq_cst) const noexcept;
 operator integral() const volatile noexcept;
 operator integral() const noexcept;
 integral exchange(integral desr,
 memory_order m = memory_order_seq_cst) volatile noexcept;
 integral exchange(integral desr, memory_order m = memory_order_seq_cst) noexcept;
 bool compare_exchange_weak(integral& expc, integral desr,
 memory_order s, memory_order f) volatile noexcept;
 bool compare_exchange_weak(integral& expc, integral desr,
 memory_order s, memory_order f) noexcept;
 bool compare_exchange_strong(integral& expc, integral desr,
 memory_order s, memory_order f) volatile noexcept;
 bool compare_exchange_strong(integral& expc, integral desr,
 memory_order s, memory_order f) noexcept;
 bool compare_exchange_weak(integral& expc, integral desr,
 memory_order m = memory_order_seq_cst) volatile noexcept;
 bool compare_exchange_weak(integral& expc, integral desr,
 memory_order m = memory_order_seq_cst) noexcept;
 bool compare_exchange_strong(integral& expc, integral desr,
 memory_order m = memory_order_seq_cst) volatile noexcept;
 bool compare_exchange_strong(integral& expc, integral desr,
 memory_order m = memory_order_seq_cst) noexcept;

 integral
 fetch_add(integral op, memory_order m = memory_order_seq_cst) volatile noexcept;
 integral fetch_add(integral op, memory_order m = memory_order_seq_cst) noexcept;
 integral
 fetch_sub(integral op, memory_order m = memory_order_seq_cst) volatile noexcept;
 integral fetch_sub(integral op, memory_order m = memory_order_seq_cst) noexcept;
 integral
 fetch_and(integral op, memory_order m = memory_order_seq_cst) volatile noexcept;
 integral fetch_and(integral op, memory_order m = memory_order_seq_cst) noexcept;
 integral
 fetch_or(integral op, memory_order m = memory_order_seq_cst) volatile noexcept;
 integral fetch_or(integral op, memory_order m = memory_order_seq_cst) noexcept;
 integral
 fetch_xor(integral op, memory_order m = memory_order_seq_cst) volatile noexcept;
 integral fetch_xor(integral op, memory_order m = memory_order_seq_cst) noexcept;

 atomic() noexcept = default;
 constexpr atomic(integral desr) noexcept;
 atomic(const atomic&) = delete;
 atomic& operator=(const atomic&) = delete;
 atomic& operator=(const atomic&) volatile = delete;
 integral operator=(integral desr) volatile noexcept;
 integral operator=(integral desr) noexcept;

 integral operator++(int) volatile noexcept;
 integral operator++(int) noexcept;
 integral operator--(int) volatile noexcept;
 integral operator--(int) noexcept;
 integral operator++() volatile noexcept;
 integral operator++() noexcept;
 integral operator--() volatile noexcept;
 integral operator--() noexcept;
 integral operator+=(integral op) volatile noexcept;
 integral operator+=(integral op) noexcept;
 integral operator-=(integral op) volatile noexcept;
 integral operator-=(integral op) noexcept;
 integral operator&=(integral op) volatile noexcept;
 integral operator&=(integral op) noexcept;
 integral operator|=(integral op) volatile noexcept;
 integral operator|=(integral op) noexcept;
 integral operator^=(integral op) volatile noexcept;
 integral operator^=(integral op) noexcept;
};

template <class T>
struct atomic<T*>
{
 bool is_lock_free() const volatile noexcept;
 bool is_lock_free() const noexcept;
 void store(T* desr, memory_order m = memory_order_seq_cst) volatile noexcept;
 void store(T* desr, memory_order m = memory_order_seq_cst) noexcept;
 T* load(memory_order m = memory_order_seq_cst) const volatile noexcept;
 T* load(memory_order m = memory_order_seq_cst) const noexcept;
 operator T*() const volatile noexcept;
 operator T*() const noexcept;
 T* exchange(T* desr, memory_order m = memory_order_seq_cst) volatile noexcept;
 T* exchange(T* desr, memory_order m = memory_order_seq_cst) noexcept;
 bool compare_exchange_weak(T*& expc, T* desr,
 memory_order s, memory_order f) volatile noexcept;
 bool compare_exchange_weak(T*& expc, T* desr,
 memory_order s, memory_order f) noexcept;
 bool compare_exchange_strong(T*& expc, T* desr,
 memory_order s, memory_order f) volatile noexcept;
 bool compare_exchange_strong(T*& expc, T* desr,
 memory_order s, memory_order f) noexcept;
 bool compare_exchange_weak(T*& expc, T* desr,
 memory_order m = memory_order_seq_cst) volatile noexcept;
 bool compare_exchange_weak(T*& expc, T* desr,
 memory_order m = memory_order_seq_cst) noexcept;
 bool compare_exchange_strong(T*& expc, T* desr,
 memory_order m = memory_order_seq_cst) volatile noexcept;
 bool compare_exchange_strong(T*& expc, T* desr,
 memory_order m = memory_order_seq_cst) noexcept;
 T* fetch_add(ptrdiff_t op, memory_order m = memory_order_seq_cst) volatile noexcept;
 T* fetch_add(ptrdiff_t op, memory_order m = memory_order_seq_cst) noexcept;
 T* fetch_sub(ptrdiff_t op, memory_order m = memory_order_seq_cst) volatile noexcept;
 T* fetch_sub(ptrdiff_t op, memory_order m = memory_order_seq_cst) noexcept;

 atomic() noexcept = default;
 constexpr atomic(T* desr) noexcept;
 atomic(const atomic&) = delete;
 atomic& operator=(const atomic&) = delete;
 atomic& operator=(const atomic&) volatile = delete;

 T* operator=(T*) volatile noexcept;
 T* operator=(T*) noexcept;
 T* operator++(int) volatile noexcept;
 T* operator++(int) noexcept;
 T* operator--(int) volatile noexcept;
 T* operator--(int) noexcept;
 T* operator++() volatile noexcept;
 T* operator++() noexcept;
 T* operator--() volatile noexcept;
 T* operator--() noexcept;
 T* operator+=(ptrdiff_t op) volatile noexcept;
 T* operator+=(ptrdiff_t op) noexcept;
 T* operator-=(ptrdiff_t op) volatile noexcept;
 T* operator-=(ptrdiff_t op) noexcept;
};


template <class T>
 bool
 atomic_is_lock_free(const volatile atomic<T>* obj) noexcept;

template <class T>
 bool
 atomic_is_lock_free(const atomic<T>* obj) noexcept;

template <class T>
 void
 atomic_init(volatile atomic<T>* obj, T desr) noexcept;

template <class T>
 void
 atomic_init(atomic<T>* obj, T desr) noexcept;

template <class T>
 void
 atomic_store(volatile atomic<T>* obj, T desr) noexcept;

template <class T>
 void
 atomic_store(atomic<T>* obj, T desr) noexcept;

template <class T>
 void
 atomic_store_explicit(volatile atomic<T>* obj, T desr, memory_order m) noexcept;

template <class T>
 void
 atomic_store_explicit(atomic<T>* obj, T desr, memory_order m) noexcept;

template <class T>
 T
 atomic_load(const volatile atomic<T>* obj) noexcept;

template <class T>
 T
 atomic_load(const atomic<T>* obj) noexcept;

template <class T>
 T
 atomic_load_explicit(const volatile atomic<T>* obj, memory_order m) noexcept;

template <class T>
 T
 atomic_load_explicit(const atomic<T>* obj, memory_order m) noexcept;

template <class T>
 T
 atomic_exchange(volatile atomic<T>* obj, T desr) noexcept;

template <class T>
 T
 atomic_exchange(atomic<T>* obj, T desr) noexcept;

template <class T>
 T
 atomic_exchange_explicit(volatile atomic<T>* obj, T desr, memory_order m) noexcept;

template <class T>
 T
 atomic_exchange_explicit(atomic<T>* obj, T desr, memory_order m) noexcept;

template <class T>
 bool
 atomic_compare_exchange_weak(volatile atomic<T>* obj, T* expc, T desr) noexcept;

template <class T>
 bool
 atomic_compare_exchange_weak(atomic<T>* obj, T* expc, T desr) noexcept;

template <class T>
 bool
 atomic_compare_exchange_strong(volatile atomic<T>* obj, T* expc, T desr) noexcept;

template <class T>
 bool
 atomic_compare_exchange_strong(atomic<T>* obj, T* expc, T desr) noexcept;

template <class T>
 bool
 atomic_compare_exchange_weak_explicit(volatile atomic<T>* obj, T* expc,
 T desr,
 memory_order s, memory_order f) noexcept;

template <class T>
 bool
 atomic_compare_exchange_weak_explicit(atomic<T>* obj, T* expc, T desr,
 memory_order s, memory_order f) noexcept;

template <class T>
 bool
 atomic_compare_exchange_strong_explicit(volatile atomic<T>* obj,
 T* expc, T desr,
 memory_order s, memory_order f) noexcept;

template <class T>
 bool
 atomic_compare_exchange_strong_explicit(atomic<T>* obj, T* expc,
 T desr,
 memory_order s, memory_order f) noexcept;

template <class Integral>
 Integral
 atomic_fetch_add(volatile atomic<Integral>* obj, Integral op) noexcept;

template <class Integral>
 Integral
 atomic_fetch_add(atomic<Integral>* obj, Integral op) noexcept;

template <class Integral>
 Integral
 atomic_fetch_add_explicit(volatile atomic<Integral>* obj, Integral op,
 memory_order m) noexcept;
template <class Integral>
 Integral
 atomic_fetch_add_explicit(atomic<Integral>* obj, Integral op,
 memory_order m) noexcept;
template <class Integral>
 Integral
 atomic_fetch_sub(volatile atomic<Integral>* obj, Integral op) noexcept;

template <class Integral>
 Integral
 atomic_fetch_sub(atomic<Integral>* obj, Integral op) noexcept;

template <class Integral>
 Integral
 atomic_fetch_sub_explicit(volatile atomic<Integral>* obj, Integral op,
 memory_order m) noexcept;
template <class Integral>
 Integral
 atomic_fetch_sub_explicit(atomic<Integral>* obj, Integral op,
 memory_order m) noexcept;
template <class Integral>
 Integral
 atomic_fetch_and(volatile atomic<Integral>* obj, Integral op) noexcept;

template <class Integral>
 Integral
 atomic_fetch_and(atomic<Integral>* obj, Integral op) noexcept;

template <class Integral>
 Integral
 atomic_fetch_and_explicit(volatile atomic<Integral>* obj, Integral op,
 memory_order m) noexcept;
template <class Integral>
 Integral
 atomic_fetch_and_explicit(atomic<Integral>* obj, Integral op,
 memory_order m) noexcept;
template <class Integral>
 Integral
 atomic_fetch_or(volatile atomic<Integral>* obj, Integral op) noexcept;

template <class Integral>
 Integral
 atomic_fetch_or(atomic<Integral>* obj, Integral op) noexcept;

template <class Integral>
 Integral
 atomic_fetch_or_explicit(volatile atomic<Integral>* obj, Integral op,
 memory_order m) noexcept;
template <class Integral>
 Integral
 atomic_fetch_or_explicit(atomic<Integral>* obj, Integral op,
 memory_order m) noexcept;
template <class Integral>
 Integral
 atomic_fetch_xor(volatile atomic<Integral>* obj, Integral op) noexcept;

template <class Integral>
 Integral
 atomic_fetch_xor(atomic<Integral>* obj, Integral op) noexcept;

template <class Integral>
 Integral
 atomic_fetch_xor_explicit(volatile atomic<Integral>* obj, Integral op,
 memory_order m) noexcept;
template <class Integral>
 Integral
 atomic_fetch_xor_explicit(atomic<Integral>* obj, Integral op,
 memory_order m) noexcept;

template <class T>
 T*
 atomic_fetch_add(volatile atomic<T*>* obj, ptrdiff_t op) noexcept;

template <class T>
 T*
 atomic_fetch_add(atomic<T*>* obj, ptrdiff_t op) noexcept;

template <class T>
 T*
 atomic_fetch_add_explicit(volatile atomic<T*>* obj, ptrdiff_t op,
 memory_order m) noexcept;
template <class T>
 T*
 atomic_fetch_add_explicit(atomic<T*>* obj, ptrdiff_t op, memory_order m) noexcept;

template <class T>
 T*
 atomic_fetch_sub(volatile atomic<T*>* obj, ptrdiff_t op) noexcept;

template <class T>
 T*
 atomic_fetch_sub(atomic<T*>* obj, ptrdiff_t op) noexcept;

template <class T>
 T*
 atomic_fetch_sub_explicit(volatile atomic<T*>* obj, ptrdiff_t op,
 memory_order m) noexcept;
template <class T>
 T*
 atomic_fetch_sub_explicit(atomic<T*>* obj, ptrdiff_t op, memory_order m) noexcept;

// Atomics for standard typedef types

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_t> atomic_char16_t;
typedef atomic<char32_t> atomic_char32_t;
typedef atomic<wchar_t> atomic_wchar_t;

typedef atomic<int_least8_t> atomic_int_least8_t;
typedef atomic<uint_least8_t> atomic_uint_least8_t;
typedef atomic<int_least16_t> atomic_int_least16_t;
typedef atomic<uint_least16_t> atomic_uint_least16_t;
typedef atomic<int_least32_t> atomic_int_least32_t;
typedef atomic<uint_least32_t> atomic_uint_least32_t;
typedef atomic<int_least64_t> atomic_int_least64_t;
typedef atomic<uint_least64_t> atomic_uint_least64_t;

typedef atomic<int_fast8_t> atomic_int_fast8_t;
typedef atomic<uint_fast8_t> atomic_uint_fast8_t;
typedef atomic<int_fast16_t> atomic_int_fast16_t;
typedef atomic<uint_fast16_t> atomic_uint_fast16_t;
typedef atomic<int_fast32_t> atomic_int_fast32_t;
typedef atomic<uint_fast32_t> atomic_uint_fast32_t;
typedef atomic<int_fast64_t> atomic_int_fast64_t;
typedef atomic<uint_fast64_t> atomic_uint_fast64_t;

typedef atomic<intptr_t> atomic_intptr_t;
typedef atomic<uintptr_t> atomic_uintptr_t;
typedef atomic<size_t> atomic_size_t;
typedef atomic<ptrdiff_t> atomic_ptrdiff_t;
typedef atomic<intmax_t> atomic_intmax_t;
typedef atomic<uintmax_t> atomic_uintmax_t;

// fences

void atomic_thread_fence(memory_order m) noexcept;
void atomic_signal_fence(memory_order m) noexcept;

} // std

*/

#include <__config>
#include <cstddef>
#include <cstdint>
#include <type_traits>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif

#ifdef _LIBCPP_HAS_NO_THREADS
#error <atomic> is not supported on this single threaded system
#else // !_LIBCPP_HAS_NO_THREADS

_LIBCPP_BEGIN_NAMESPACE_STD

#if !__has_feature(cxx_atomic) && _GNUC_VER < 407
#error <atomic> is not implemented
#else

typedef enum memory_order
{
 memory_order_relaxed, memory_order_consume, memory_order_acquire,
 memory_order_release, memory_order_acq_rel, memory_order_seq_cst
} memory_order;

#if _GNUC_VER >= 407
namespace __gcc_atomic {
template <typename T>
struct __gcc_atomic_t {
 __gcc_atomic_t() _NOEXCEPT {}
 explicit __gcc_atomic_t(T value) _NOEXCEPT : __a_value(value) {}
 T __a_value;
};
#define _Atomic(x) __gcc_atomic::__gcc_atomic_t<x>

template <typename T> T __create();

template <typename __Tp, typename __Td>
typename enable_if<sizeof(__Tp()->__a_value = __create<__Td>()), char>::type
 __test_atomic_assignable(int);
template <typename T, typename U>
__two __test_atomic_assignable(...);

template <typename __Tp, typename __Td>
struct __can_assign {
 static const bool value =
 sizeof(__test_atomic_assignable<__Tp, __Td>(1)) == sizeof(char);
};

static inline constexpr int __to_gcc_order(memory_order __order) {
 // Avoid switch statement to make this a constexpr.
 return __order == memory_order_relaxed ? __ATOMIC_RELAXED:
 (__order == memory_order_acquire ? __ATOMIC_ACQUIRE:
 (__order == memory_order_release ? __ATOMIC_RELEASE:
 (__order == memory_order_seq_cst ? __ATOMIC_SEQ_CST:
 (__order == memory_order_acq_rel ? __ATOMIC_ACQ_REL:
 __ATOMIC_CONSUME))));
}

} // namespace __gcc_atomic

template <typename _Tp>
static inline
typename enable_if<
 __gcc_atomic::__can_assign<volatile _Atomic(_Tp)*, _Tp>::value>::type
__c11_atomic_init(volatile _Atomic(_Tp)* __a, _Tp __val) {
 __a->__a_value = __val;
}

template <typename _Tp>
static inline
typename enable_if<
 !__gcc_atomic::__can_assign<volatile _Atomic(_Tp)*, _Tp>::value &&
 __gcc_atomic::__can_assign< _Atomic(_Tp)*, _Tp>::value>::type
__c11_atomic_init(volatile _Atomic(_Tp)* __a, _Tp __val) {
 // [atomics.types.generic]p1 guarantees _Tp is trivially copyable. Because
 // the default operator= in an object is not volatile, a byte-by-byte copy
 // is required.
 volatile char* to = reinterpret_cast<volatile char*>(&__a->__a_value);
 volatile char* end = to + sizeof(_Tp);
 char* from = reinterpret_cast<char*>(&__val);
 while (to != end) {
 *to++ = *from++;
 }
}

template <typename _Tp>
static inline void __c11_atomic_init(_Atomic(_Tp)* __a, _Tp __val) {
 __a->__a_value = __val;
}

static inline void __c11_atomic_thread_fence(memory_order __order) {
 __atomic_thread_fence(__gcc_atomic::__to_gcc_order(__order));
}

static inline void __c11_atomic_signal_fence(memory_order __order) {
 __atomic_signal_fence(__gcc_atomic::__to_gcc_order(__order));
}

static inline bool __c11_atomic_is_lock_free(size_t __size) {
 return __atomic_is_lock_free(__size, 0);
}

template <typename _Tp>
static inline void __c11_atomic_store(volatile _Atomic(_Tp)* __a, _Tp __val,
 memory_order __order) {
 return __atomic_store(&__a->__a_value, &__val,
 __gcc_atomic::__to_gcc_order(__order));
}

template <typename _Tp>
static inline void __c11_atomic_store(_Atomic(_Tp)* __a, _Tp __val,
 memory_order __order) {
 return __atomic_store(&__a->__a_value, &__val,
 __gcc_atomic::__to_gcc_order(__order));
}

template <typename _Tp>
static inline _Tp __c11_atomic_load(volatile _Atomic(_Tp)* __a,
 memory_order __order) {
 _Tp __ret;
 __atomic_load(&__a->__a_value, &__ret,
 __gcc_atomic::__to_gcc_order(__order));
 return __ret;
}

template <typename _Tp>
static inline _Tp __c11_atomic_load(_Atomic(_Tp)* __a, memory_order __order) {
 _Tp __ret;
 __atomic_load(&__a->__a_value, &__ret,
 __gcc_atomic::__to_gcc_order(__order));
 return __ret;
}

template <typename _Tp>
static inline _Tp __c11_atomic_exchange(volatile _Atomic(_Tp)* __a,
 _Tp __value, memory_order __order) {
 _Tp __ret;
 __atomic_exchange(&__a->__a_value, &__value, &__ret,
 __gcc_atomic::__to_gcc_order(__order));
 return __ret;
}

template <typename _Tp>
static inline _Tp __c11_atomic_exchange(_Atomic(_Tp)* __a, _Tp __value,
 memory_order __order) {
 _Tp __ret;
 __atomic_exchange(&__a->__a_value, &__value, &__ret,
 __gcc_atomic::__to_gcc_order(__order));
 return __ret;
}

template <typename _Tp>
static inline bool __c11_atomic_compare_exchange_strong(
 volatile _Atomic(_Tp)* __a, _Tp* __expected, _Tp __value,
 memory_order __success, memory_order __failure) {
 return __atomic_compare_exchange(&__a->__a_value, __expected, &__value,
 false,
 __gcc_atomic::__to_gcc_order(__success),
 __gcc_atomic::__to_gcc_order(__failure));
}

template <typename _Tp>
static inline bool __c11_atomic_compare_exchange_strong(
 _Atomic(_Tp)* __a, _Tp* __expected, _Tp __value, memory_order __success,
 memory_order __failure) {
 return __atomic_compare_exchange(&__a->__a_value, __expected, &__value,
 false,
 __gcc_atomic::__to_gcc_order(__success),
 __gcc_atomic::__to_gcc_order(__failure));
}

template <typename _Tp>
static inline bool __c11_atomic_compare_exchange_weak(
 volatile _Atomic(_Tp)* __a, _Tp* __expected, _Tp __value,
 memory_order __success, memory_order __failure) {
 return __atomic_compare_exchange(&__a->__a_value, __expected, &__value,
 true,
 __gcc_atomic::__to_gcc_order(__success),
 __gcc_atomic::__to_gcc_order(__failure));
}

template <typename _Tp>
static inline bool __c11_atomic_compare_exchange_weak(
 _Atomic(_Tp)* __a, _Tp* __expected, _Tp __value, memory_order __success,
 memory_order __failure) {
 return __atomic_compare_exchange(&__a->__a_value, __expected, &__value,
 true,
 __gcc_atomic::__to_gcc_order(__success),
 __gcc_atomic::__to_gcc_order(__failure));
}

template <typename _Tp>
struct __skip_amt { enum {value = 1}; };

template <typename _Tp>
struct __skip_amt<_Tp*> { enum {value = sizeof(_Tp)}; };

// FIXME: Haven't figured out what the spec says about using arrays with
// atomic_fetch_add. Force a failure rather than creating bad behavior.
template <typename _Tp>
struct __skip_amt<_Tp[]> { };
template <typename _Tp, int n>
struct __skip_amt<_Tp[n]> { };

template <typename _Tp, typename _Td>
static inline _Tp __c11_atomic_fetch_add(volatile _Atomic(_Tp)* __a,
 _Td __delta, memory_order __order) {
 return __atomic_fetch_add(&__a->__a_value, __delta * __skip_amt<_Tp>::value,
 __gcc_atomic::__to_gcc_order(__order));
}

template <typename _Tp, typename _Td>
static inline _Tp __c11_atomic_fetch_add(_Atomic(_Tp)* __a, _Td __delta,
 memory_order __order) {
 return __atomic_fetch_add(&__a->__a_value, __delta * __skip_amt<_Tp>::value,
 __gcc_atomic::__to_gcc_order(__order));
}

template <typename _Tp, typename _Td>
static inline _Tp __c11_atomic_fetch_sub(volatile _Atomic(_Tp)* __a,
 _Td __delta, memory_order __order) {
 return __atomic_fetch_sub(&__a->__a_value, __delta * __skip_amt<_Tp>::value,
 __gcc_atomic::__to_gcc_order(__order));
}

template <typename _Tp, typename _Td>
static inline _Tp __c11_atomic_fetch_sub(_Atomic(_Tp)* __a, _Td __delta,
 memory_order __order) {
 return __atomic_fetch_sub(&__a->__a_value, __delta * __skip_amt<_Tp>::value,
 __gcc_atomic::__to_gcc_order(__order));
}

template <typename _Tp>
static inline _Tp __c11_atomic_fetch_and(volatile _Atomic(_Tp)* __a,
 _Tp __pattern, memory_order __order) {
 return __atomic_fetch_and(&__a->__a_value, __pattern,
 __gcc_atomic::__to_gcc_order(__order));
}

template <typename _Tp>
static inline _Tp __c11_atomic_fetch_and(_Atomic(_Tp)* __a,
 _Tp __pattern, memory_order __order) {
 return __atomic_fetch_and(&__a->__a_value, __pattern,
 __gcc_atomic::__to_gcc_order(__order));
}

template <typename _Tp>
static inline _Tp __c11_atomic_fetch_or(volatile _Atomic(_Tp)* __a,
 _Tp __pattern, memory_order __order) {
 return __atomic_fetch_or(&__a->__a_value, __pattern,
 __gcc_atomic::__to_gcc_order(__order));
}

template <typename _Tp>
static inline _Tp __c11_atomic_fetch_or(_Atomic(_Tp)* __a, _Tp __pattern,
 memory_order __order) {
 return __atomic_fetch_or(&__a->__a_value, __pattern,
 __gcc_atomic::__to_gcc_order(__order));
}

template <typename _Tp>
static inline _Tp __c11_atomic_fetch_xor(volatile _Atomic(_Tp)* __a,
 _Tp __pattern, memory_order __order) {
 return __atomic_fetch_xor(&__a->__a_value, __pattern,
 __gcc_atomic::__to_gcc_order(__order));
}

template <typename _Tp>
static inline _Tp __c11_atomic_fetch_xor(_Atomic(_Tp)* __a, _Tp __pattern,
 memory_order __order) {
 return __atomic_fetch_xor(&__a->__a_value, __pattern,
 __gcc_atomic::__to_gcc_order(__order));
}
#endif // _GNUC_VER >= 407

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
_Tp
kill_dependency(_Tp __y) _NOEXCEPT
{
 return __y;
}

// general atomic<T>

template <class _Tp, bool = is_integral<_Tp>::value && !is_same<_Tp, bool>::value>
struct __atomic_base // false
{
 mutable _Atomic(_Tp) __a_;

 _LIBCPP_INLINE_VISIBILITY
 bool is_lock_free() const volatile _NOEXCEPT
 {return __c11_atomic_is_lock_free(sizeof(_Tp));}
 _LIBCPP_INLINE_VISIBILITY
 bool is_lock_free() const _NOEXCEPT
 {return __c11_atomic_is_lock_free(sizeof(_Tp));}
 _LIBCPP_INLINE_VISIBILITY
 void store(_Tp __d, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
 {__c11_atomic_store(&__a_, __d, __m);}
 _LIBCPP_INLINE_VISIBILITY
 void store(_Tp __d, memory_order __m = memory_order_seq_cst) _NOEXCEPT
 {__c11_atomic_store(&__a_, __d, __m);}
 _LIBCPP_INLINE_VISIBILITY
 _Tp load(memory_order __m = memory_order_seq_cst) const volatile _NOEXCEPT
 {return __c11_atomic_load(&__a_, __m);}
 _LIBCPP_INLINE_VISIBILITY
 _Tp load(memory_order __m = memory_order_seq_cst) const _NOEXCEPT
 {return __c11_atomic_load(&__a_, __m);}
 _LIBCPP_INLINE_VISIBILITY
 operator _Tp() const volatile _NOEXCEPT {return load();}
 _LIBCPP_INLINE_VISIBILITY
 operator _Tp() const _NOEXCEPT {return load();}
 _LIBCPP_INLINE_VISIBILITY
 _Tp exchange(_Tp __d, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
 {return __c11_atomic_exchange(&__a_, __d, __m);}
 _LIBCPP_INLINE_VISIBILITY
 _Tp exchange(_Tp __d, memory_order __m = memory_order_seq_cst) _NOEXCEPT
 {return __c11_atomic_exchange(&__a_, __d, __m);}
 _LIBCPP_INLINE_VISIBILITY
 bool compare_exchange_weak(_Tp& __e, _Tp __d,
 memory_order __s, memory_order __f) volatile _NOEXCEPT
 {return __c11_atomic_compare_exchange_weak(&__a_, &__e, __d, __s, __f);}
 _LIBCPP_INLINE_VISIBILITY
 bool compare_exchange_weak(_Tp& __e, _Tp __d,
 memory_order __s, memory_order __f) _NOEXCEPT
 {return __c11_atomic_compare_exchange_weak(&__a_, &__e, __d, __s, __f);}
 _LIBCPP_INLINE_VISIBILITY
 bool compare_exchange_strong(_Tp& __e, _Tp __d,
 memory_order __s, memory_order __f) volatile _NOEXCEPT
 {return __c11_atomic_compare_exchange_strong(&__a_, &__e, __d, __s, __f);}
 _LIBCPP_INLINE_VISIBILITY
 bool compare_exchange_strong(_Tp& __e, _Tp __d,
 memory_order __s, memory_order __f) _NOEXCEPT
 {return __c11_atomic_compare_exchange_strong(&__a_, &__e, __d, __s, __f);}
 _LIBCPP_INLINE_VISIBILITY
 bool compare_exchange_weak(_Tp& __e, _Tp __d,
 memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
 {return __c11_atomic_compare_exchange_weak(&__a_, &__e, __d, __m, __m);}
 _LIBCPP_INLINE_VISIBILITY
 bool compare_exchange_weak(_Tp& __e, _Tp __d,
 memory_order __m = memory_order_seq_cst) _NOEXCEPT
 {return __c11_atomic_compare_exchange_weak(&__a_, &__e, __d, __m, __m);}
 _LIBCPP_INLINE_VISIBILITY
 bool compare_exchange_strong(_Tp& __e, _Tp __d,
 memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
 {return __c11_atomic_compare_exchange_strong(&__a_, &__e, __d, __m, __m);}
 _LIBCPP_INLINE_VISIBILITY
 bool compare_exchange_strong(_Tp& __e, _Tp __d,
 memory_order __m = memory_order_seq_cst) _NOEXCEPT
 {return __c11_atomic_compare_exchange_strong(&__a_, &__e, __d, __m, __m);}

 _LIBCPP_INLINE_VISIBILITY
#ifndef _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
 __atomic_base() _NOEXCEPT = default;
#else
 __atomic_base() _NOEXCEPT : __a_() {}
#endif // _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS

 _LIBCPP_INLINE_VISIBILITY
 _LIBCPP_CONSTEXPR __atomic_base(_Tp __d) _NOEXCEPT : __a_(__d) {}
#ifndef _LIBCPP_HAS_NO_DELETED_FUNCTIONS
 __atomic_base(const __atomic_base&) = delete;
 __atomic_base& operator=(const __atomic_base&) = delete;
 __atomic_base& operator=(const __atomic_base&) volatile = delete;
#else // _LIBCPP_HAS_NO_DELETED_FUNCTIONS
private:
 __atomic_base(const __atomic_base&);
 __atomic_base& operator=(const __atomic_base&);
 __atomic_base& operator=(const __atomic_base&) volatile;
#endif // _LIBCPP_HAS_NO_DELETED_FUNCTIONS
};

// atomic<Integral>

template <class _Tp>
struct __atomic_base<_Tp, true>
 : public __atomic_base<_Tp, false>
{
 typedef __atomic_base<_Tp, false> __base;
 _LIBCPP_INLINE_VISIBILITY
 __atomic_base() _NOEXCEPT _LIBCPP_DEFAULT
 _LIBCPP_INLINE_VISIBILITY
 _LIBCPP_CONSTEXPR __atomic_base(_Tp __d) _NOEXCEPT : __base(__d) {}

 _LIBCPP_INLINE_VISIBILITY
 _Tp fetch_add(_Tp __op, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
 {return __c11_atomic_fetch_add(&this->__a_, __op, __m);}
 _LIBCPP_INLINE_VISIBILITY
 _Tp fetch_add(_Tp __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT
 {return __c11_atomic_fetch_add(&this->__a_, __op, __m);}
 _LIBCPP_INLINE_VISIBILITY
 _Tp fetch_sub(_Tp __op, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
 {return __c11_atomic_fetch_sub(&this->__a_, __op, __m);}
 _LIBCPP_INLINE_VISIBILITY
 _Tp fetch_sub(_Tp __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT
 {return __c11_atomic_fetch_sub(&this->__a_, __op, __m);}
 _LIBCPP_INLINE_VISIBILITY
 _Tp fetch_and(_Tp __op, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
 {return __c11_atomic_fetch_and(&this->__a_, __op, __m);}
 _LIBCPP_INLINE_VISIBILITY
 _Tp fetch_and(_Tp __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT
 {return __c11_atomic_fetch_and(&this->__a_, __op, __m);}
 _LIBCPP_INLINE_VISIBILITY
 _Tp fetch_or(_Tp __op, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
 {return __c11_atomic_fetch_or(&this->__a_, __op, __m);}
 _LIBCPP_INLINE_VISIBILITY
 _Tp fetch_or(_Tp __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT
 {return __c11_atomic_fetch_or(&this->__a_, __op, __m);}
 _LIBCPP_INLINE_VISIBILITY
 _Tp fetch_xor(_Tp __op, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
 {return __c11_atomic_fetch_xor(&this->__a_, __op, __m);}
 _LIBCPP_INLINE_VISIBILITY
 _Tp fetch_xor(_Tp __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT
 {return __c11_atomic_fetch_xor(&this->__a_, __op, __m);}

 _LIBCPP_INLINE_VISIBILITY
 _Tp operator++(int) volatile _NOEXCEPT {return fetch_add(_Tp(1));}
 _LIBCPP_INLINE_VISIBILITY
 _Tp operator++(int) _NOEXCEPT {return fetch_add(_Tp(1));}
 _LIBCPP_INLINE_VISIBILITY
 _Tp operator--(int) volatile _NOEXCEPT {return fetch_sub(_Tp(1));}
 _LIBCPP_INLINE_VISIBILITY
 _Tp operator--(int) _NOEXCEPT {return fetch_sub(_Tp(1));}
 _LIBCPP_INLINE_VISIBILITY
 _Tp operator++() volatile _NOEXCEPT {return fetch_add(_Tp(1)) + _Tp(1);}
 _LIBCPP_INLINE_VISIBILITY
 _Tp operator++() _NOEXCEPT {return fetch_add(_Tp(1)) + _Tp(1);}
 _LIBCPP_INLINE_VISIBILITY
 _Tp operator--() volatile _NOEXCEPT {return fetch_sub(_Tp(1)) - _Tp(1);}
 _LIBCPP_INLINE_VISIBILITY
 _Tp operator--() _NOEXCEPT {return fetch_sub(_Tp(1)) - _Tp(1);}
 _LIBCPP_INLINE_VISIBILITY
 _Tp operator+=(_Tp __op) volatile _NOEXCEPT {return fetch_add(__op) + __op;}
 _LIBCPP_INLINE_VISIBILITY
 _Tp operator+=(_Tp __op) _NOEXCEPT {return fetch_add(__op) + __op;}
 _LIBCPP_INLINE_VISIBILITY
 _Tp operator-=(_Tp __op) volatile _NOEXCEPT {return fetch_sub(__op) - __op;}
 _LIBCPP_INLINE_VISIBILITY
 _Tp operator-=(_Tp __op) _NOEXCEPT {return fetch_sub(__op) - __op;}
 _LIBCPP_INLINE_VISIBILITY
 _Tp operator&=(_Tp __op) volatile _NOEXCEPT {return fetch_and(__op) & __op;}
 _LIBCPP_INLINE_VISIBILITY
 _Tp operator&=(_Tp __op) _NOEXCEPT {return fetch_and(__op) & __op;}
 _LIBCPP_INLINE_VISIBILITY
 _Tp operator|=(_Tp __op) volatile _NOEXCEPT {return fetch_or(__op) | __op;}
 _LIBCPP_INLINE_VISIBILITY
 _Tp operator|=(_Tp __op) _NOEXCEPT {return fetch_or(__op) | __op;}
 _LIBCPP_INLINE_VISIBILITY
 _Tp operator^=(_Tp __op) volatile _NOEXCEPT {return fetch_xor(__op) ^ __op;}
 _LIBCPP_INLINE_VISIBILITY
 _Tp operator^=(_Tp __op) _NOEXCEPT {return fetch_xor(__op) ^ __op;}
};

// atomic<T>

template <class _Tp>
struct atomic
 : public __atomic_base<_Tp>
{
 typedef __atomic_base<_Tp> __base;
 _LIBCPP_INLINE_VISIBILITY
 atomic() _NOEXCEPT _LIBCPP_DEFAULT
 _LIBCPP_INLINE_VISIBILITY
 _LIBCPP_CONSTEXPR atomic(_Tp __d) _NOEXCEPT : __base(__d) {}

 _LIBCPP_INLINE_VISIBILITY
 _Tp operator=(_Tp __d) volatile _NOEXCEPT
 {__base::store(__d); return __d;}
 _LIBCPP_INLINE_VISIBILITY
 _Tp operator=(_Tp __d) _NOEXCEPT
 {__base::store(__d); return __d;}
};

// atomic<T*>

template <class _Tp>
struct atomic<_Tp*>
 : public __atomic_base<_Tp*>
{
 typedef __atomic_base<_Tp*> __base;
 _LIBCPP_INLINE_VISIBILITY
 atomic() _NOEXCEPT _LIBCPP_DEFAULT
 _LIBCPP_INLINE_VISIBILITY
 _LIBCPP_CONSTEXPR atomic(_Tp* __d) _NOEXCEPT : __base(__d) {}

 _LIBCPP_INLINE_VISIBILITY
 _Tp* operator=(_Tp* __d) volatile _NOEXCEPT
 {__base::store(__d); return __d;}
 _LIBCPP_INLINE_VISIBILITY
 _Tp* operator=(_Tp* __d) _NOEXCEPT
 {__base::store(__d); return __d;}

 _LIBCPP_INLINE_VISIBILITY
 _Tp* fetch_add(ptrdiff_t __op, memory_order __m = memory_order_seq_cst)
 volatile _NOEXCEPT
 {return __c11_atomic_fetch_add(&this->__a_, __op, __m);}
 _LIBCPP_INLINE_VISIBILITY
 _Tp* fetch_add(ptrdiff_t __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT
 {return __c11_atomic_fetch_add(&this->__a_, __op, __m);}
 _LIBCPP_INLINE_VISIBILITY
 _Tp* fetch_sub(ptrdiff_t __op, memory_order __m = memory_order_seq_cst)
 volatile _NOEXCEPT
 {return __c11_atomic_fetch_sub(&this->__a_, __op, __m);}
 _LIBCPP_INLINE_VISIBILITY
 _Tp* fetch_sub(ptrdiff_t __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT
 {return __c11_atomic_fetch_sub(&this->__a_, __op, __m);}

 _LIBCPP_INLINE_VISIBILITY
 _Tp* operator++(int) volatile _NOEXCEPT {return fetch_add(1);}
 _LIBCPP_INLINE_VISIBILITY
 _Tp* operator++(int) _NOEXCEPT {return fetch_add(1);}
 _LIBCPP_INLINE_VISIBILITY
 _Tp* operator--(int) volatile _NOEXCEPT {return fetch_sub(1);}
 _LIBCPP_INLINE_VISIBILITY
 _Tp* operator--(int) _NOEXCEPT {return fetch_sub(1);}
 _LIBCPP_INLINE_VISIBILITY
 _Tp* operator++() volatile _NOEXCEPT {return fetch_add(1) + 1;}
 _LIBCPP_INLINE_VISIBILITY
 _Tp* operator++() _NOEXCEPT {return fetch_add(1) + 1;}
 _LIBCPP_INLINE_VISIBILITY
 _Tp* operator--() volatile _NOEXCEPT {return fetch_sub(1) - 1;}
 _LIBCPP_INLINE_VISIBILITY
 _Tp* operator--() _NOEXCEPT {return fetch_sub(1) - 1;}
 _LIBCPP_INLINE_VISIBILITY
 _Tp* operator+=(ptrdiff_t __op) volatile _NOEXCEPT {return fetch_add(__op) + __op;}
 _LIBCPP_INLINE_VISIBILITY
 _Tp* operator+=(ptrdiff_t __op) _NOEXCEPT {return fetch_add(__op) + __op;}
 _LIBCPP_INLINE_VISIBILITY
 _Tp* operator-=(ptrdiff_t __op) volatile _NOEXCEPT {return fetch_sub(__op) - __op;}
 _LIBCPP_INLINE_VISIBILITY
 _Tp* operator-=(ptrdiff_t __op) _NOEXCEPT {return fetch_sub(__op) - __op;}
};

// atomic_is_lock_free

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
bool
atomic_is_lock_free(const volatile atomic<_Tp>* __o) _NOEXCEPT
{
 return __o->is_lock_free();
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
bool
atomic_is_lock_free(const atomic<_Tp>* __o) _NOEXCEPT
{
 return __o->is_lock_free();
}

// atomic_init

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
void
atomic_init(volatile atomic<_Tp>* __o, _Tp __d) _NOEXCEPT
{
 __c11_atomic_init(&__o->__a_, __d);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
void
atomic_init(atomic<_Tp>* __o, _Tp __d) _NOEXCEPT
{
 __c11_atomic_init(&__o->__a_, __d);
}

// atomic_store

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
void
atomic_store(volatile atomic<_Tp>* __o, _Tp __d) _NOEXCEPT
{
 __o->store(__d);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
void
atomic_store(atomic<_Tp>* __o, _Tp __d) _NOEXCEPT
{
 __o->store(__d);
}

// atomic_store_explicit

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
void
atomic_store_explicit(volatile atomic<_Tp>* __o, _Tp __d, memory_order __m) _NOEXCEPT
{
 __o->store(__d, __m);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
void
atomic_store_explicit(atomic<_Tp>* __o, _Tp __d, memory_order __m) _NOEXCEPT
{
 __o->store(__d, __m);
}

// atomic_load

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
_Tp
atomic_load(const volatile atomic<_Tp>* __o) _NOEXCEPT
{
 return __o->load();
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
_Tp
atomic_load(const atomic<_Tp>* __o) _NOEXCEPT
{
 return __o->load();
}

// atomic_load_explicit

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
_Tp
atomic_load_explicit(const volatile atomic<_Tp>* __o, memory_order __m) _NOEXCEPT
{
 return __o->load(__m);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
_Tp
atomic_load_explicit(const atomic<_Tp>* __o, memory_order __m) _NOEXCEPT
{
 return __o->load(__m);
}

// atomic_exchange

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
_Tp
atomic_exchange(volatile atomic<_Tp>* __o, _Tp __d) _NOEXCEPT
{
 return __o->exchange(__d);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
_Tp
atomic_exchange(atomic<_Tp>* __o, _Tp __d) _NOEXCEPT
{
 return __o->exchange(__d);
}

// atomic_exchange_explicit

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
_Tp
atomic_exchange_explicit(volatile atomic<_Tp>* __o, _Tp __d, memory_order __m) _NOEXCEPT
{
 return __o->exchange(__d, __m);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
_Tp
atomic_exchange_explicit(atomic<_Tp>* __o, _Tp __d, memory_order __m) _NOEXCEPT
{
 return __o->exchange(__d, __m);
}

// atomic_compare_exchange_weak

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
bool
atomic_compare_exchange_weak(volatile atomic<_Tp>* __o, _Tp* __e, _Tp __d) _NOEXCEPT
{
 return __o->compare_exchange_weak(*__e, __d);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
bool
atomic_compare_exchange_weak(atomic<_Tp>* __o, _Tp* __e, _Tp __d) _NOEXCEPT
{
 return __o->compare_exchange_weak(*__e, __d);
}

// atomic_compare_exchange_strong

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
bool
atomic_compare_exchange_strong(volatile atomic<_Tp>* __o, _Tp* __e, _Tp __d) _NOEXCEPT
{
 return __o->compare_exchange_strong(*__e, __d);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
bool
atomic_compare_exchange_strong(atomic<_Tp>* __o, _Tp* __e, _Tp __d) _NOEXCEPT
{
 return __o->compare_exchange_strong(*__e, __d);
}

// atomic_compare_exchange_weak_explicit

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
bool
atomic_compare_exchange_weak_explicit(volatile atomic<_Tp>* __o, _Tp* __e,
 _Tp __d,
 memory_order __s, memory_order __f) _NOEXCEPT
{
 return __o->compare_exchange_weak(*__e, __d, __s, __f);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
bool
atomic_compare_exchange_weak_explicit(atomic<_Tp>* __o, _Tp* __e, _Tp __d,
 memory_order __s, memory_order __f) _NOEXCEPT
{
 return __o->compare_exchange_weak(*__e, __d, __s, __f);
}

// atomic_compare_exchange_strong_explicit

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
bool
atomic_compare_exchange_strong_explicit(volatile atomic<_Tp>* __o,
 _Tp* __e, _Tp __d,
 memory_order __s, memory_order __f) _NOEXCEPT
{
 return __o->compare_exchange_strong(*__e, __d, __s, __f);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
bool
atomic_compare_exchange_strong_explicit(atomic<_Tp>* __o, _Tp* __e,
 _Tp __d,
 memory_order __s, memory_order __f) _NOEXCEPT
{
 return __o->compare_exchange_strong(*__e, __d, __s, __f);
}

// atomic_fetch_add

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if
<
 is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
 _Tp
>::type
atomic_fetch_add(volatile atomic<_Tp>* __o, _Tp __op) _NOEXCEPT
{
 return __o->fetch_add(__op);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if
<
 is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
 _Tp
>::type
atomic_fetch_add(atomic<_Tp>* __o, _Tp __op) _NOEXCEPT
{
 return __o->fetch_add(__op);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
_Tp*
atomic_fetch_add(volatile atomic<_Tp*>* __o, ptrdiff_t __op) _NOEXCEPT
{
 return __o->fetch_add(__op);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
_Tp*
atomic_fetch_add(atomic<_Tp*>* __o, ptrdiff_t __op) _NOEXCEPT
{
 return __o->fetch_add(__op);
}

// atomic_fetch_add_explicit

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if
<
 is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
 _Tp
>::type
atomic_fetch_add_explicit(volatile atomic<_Tp>* __o, _Tp __op, memory_order __m) _NOEXCEPT
{
 return __o->fetch_add(__op, __m);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if
<
 is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
 _Tp
>::type
atomic_fetch_add_explicit(atomic<_Tp>* __o, _Tp __op, memory_order __m) _NOEXCEPT
{
 return __o->fetch_add(__op, __m);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
_Tp*
atomic_fetch_add_explicit(volatile atomic<_Tp*>* __o, ptrdiff_t __op,
 memory_order __m) _NOEXCEPT
{
 return __o->fetch_add(__op, __m);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
_Tp*
atomic_fetch_add_explicit(atomic<_Tp*>* __o, ptrdiff_t __op, memory_order __m) _NOEXCEPT
{
 return __o->fetch_add(__op, __m);
}

// atomic_fetch_sub

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if
<
 is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
 _Tp
>::type
atomic_fetch_sub(volatile atomic<_Tp>* __o, _Tp __op) _NOEXCEPT
{
 return __o->fetch_sub(__op);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if
<
 is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
 _Tp
>::type
atomic_fetch_sub(atomic<_Tp>* __o, _Tp __op) _NOEXCEPT
{
 return __o->fetch_sub(__op);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
_Tp*
atomic_fetch_sub(volatile atomic<_Tp*>* __o, ptrdiff_t __op) _NOEXCEPT
{
 return __o->fetch_sub(__op);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
_Tp*
atomic_fetch_sub(atomic<_Tp*>* __o, ptrdiff_t __op) _NOEXCEPT
{
 return __o->fetch_sub(__op);
}

// atomic_fetch_sub_explicit

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if
<
 is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
 _Tp
>::type
atomic_fetch_sub_explicit(volatile atomic<_Tp>* __o, _Tp __op, memory_order __m) _NOEXCEPT
{
 return __o->fetch_sub(__op, __m);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if
<
 is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
 _Tp
>::type
atomic_fetch_sub_explicit(atomic<_Tp>* __o, _Tp __op, memory_order __m) _NOEXCEPT
{
 return __o->fetch_sub(__op, __m);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
_Tp*
atomic_fetch_sub_explicit(volatile atomic<_Tp*>* __o, ptrdiff_t __op,
 memory_order __m) _NOEXCEPT
{
 return __o->fetch_sub(__op, __m);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
_Tp*
atomic_fetch_sub_explicit(atomic<_Tp*>* __o, ptrdiff_t __op, memory_order __m) _NOEXCEPT
{
 return __o->fetch_sub(__op, __m);
}

// atomic_fetch_and

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if
<
 is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
 _Tp
>::type
atomic_fetch_and(volatile atomic<_Tp>* __o, _Tp __op) _NOEXCEPT
{
 return __o->fetch_and(__op);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if
<
 is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
 _Tp
>::type
atomic_fetch_and(atomic<_Tp>* __o, _Tp __op) _NOEXCEPT
{
 return __o->fetch_and(__op);
}

// atomic_fetch_and_explicit

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if
<
 is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
 _Tp
>::type
atomic_fetch_and_explicit(volatile atomic<_Tp>* __o, _Tp __op, memory_order __m) _NOEXCEPT
{
 return __o->fetch_and(__op, __m);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if
<
 is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
 _Tp
>::type
atomic_fetch_and_explicit(atomic<_Tp>* __o, _Tp __op, memory_order __m) _NOEXCEPT
{
 return __o->fetch_and(__op, __m);
}

// atomic_fetch_or

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if
<
 is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
 _Tp
>::type
atomic_fetch_or(volatile atomic<_Tp>* __o, _Tp __op) _NOEXCEPT
{
 return __o->fetch_or(__op);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if
<
 is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
 _Tp
>::type
atomic_fetch_or(atomic<_Tp>* __o, _Tp __op) _NOEXCEPT
{
 return __o->fetch_or(__op);
}

// atomic_fetch_or_explicit

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if
<
 is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
 _Tp
>::type
atomic_fetch_or_explicit(volatile atomic<_Tp>* __o, _Tp __op, memory_order __m) _NOEXCEPT
{
 return __o->fetch_or(__op, __m);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if
<
 is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
 _Tp
>::type
atomic_fetch_or_explicit(atomic<_Tp>* __o, _Tp __op, memory_order __m) _NOEXCEPT
{
 return __o->fetch_or(__op, __m);
}

// atomic_fetch_xor

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if
<
 is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
 _Tp
>::type
atomic_fetch_xor(volatile atomic<_Tp>* __o, _Tp __op) _NOEXCEPT
{
 return __o->fetch_xor(__op);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if
<
 is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
 _Tp
>::type
atomic_fetch_xor(atomic<_Tp>* __o, _Tp __op) _NOEXCEPT
{
 return __o->fetch_xor(__op);
}

// atomic_fetch_xor_explicit

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if
<
 is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
 _Tp
>::type
atomic_fetch_xor_explicit(volatile atomic<_Tp>* __o, _Tp __op, memory_order __m) _NOEXCEPT
{
 return __o->fetch_xor(__op, __m);
}

template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if
<
 is_integral<_Tp>::value && !is_same<_Tp, bool>::value,
 _Tp
>::type
atomic_fetch_xor_explicit(atomic<_Tp>* __o, _Tp __op, memory_order __m) _NOEXCEPT
{
 return __o->fetch_xor(__op, __m);
}

// flag type and operations

typedef struct atomic_flag
{
 _Atomic(bool) __a_;

 _LIBCPP_INLINE_VISIBILITY
 bool test_and_set(memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
 {return __c11_atomic_exchange(&__a_, true, __m);}
 _LIBCPP_INLINE_VISIBILITY
 bool test_and_set(memory_order __m = memory_order_seq_cst) _NOEXCEPT
 {return __c11_atomic_exchange(&__a_, true, __m);}
 _LIBCPP_INLINE_VISIBILITY
 void clear(memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
 {__c11_atomic_store(&__a_, false, __m);}
 _LIBCPP_INLINE_VISIBILITY
 void clear(memory_order __m = memory_order_seq_cst) _NOEXCEPT
 {__c11_atomic_store(&__a_, false, __m);}

 _LIBCPP_INLINE_VISIBILITY
#ifndef _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
 atomic_flag() _NOEXCEPT = default;
#else
 atomic_flag() _NOEXCEPT : __a_() {}
#endif // _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS

 _LIBCPP_INLINE_VISIBILITY
 atomic_flag(bool __b) _NOEXCEPT : __a_(__b) {}

#ifndef _LIBCPP_HAS_NO_DELETED_FUNCTIONS
 atomic_flag(const atomic_flag&) = delete;
 atomic_flag& operator=(const atomic_flag&) = delete;
 atomic_flag& operator=(const atomic_flag&) volatile = delete;
#else // _LIBCPP_HAS_NO_DELETED_FUNCTIONS
private:
 atomic_flag(const atomic_flag&);
 atomic_flag& operator=(const atomic_flag&);
 atomic_flag& operator=(const atomic_flag&) volatile;
#endif // _LIBCPP_HAS_NO_DELETED_FUNCTIONS
} atomic_flag;

inline _LIBCPP_INLINE_VISIBILITY
bool
atomic_flag_test_and_set(volatile atomic_flag* __o) _NOEXCEPT
{
 return __o->test_and_set();
}

inline _LIBCPP_INLINE_VISIBILITY
bool
atomic_flag_test_and_set(atomic_flag* __o) _NOEXCEPT
{
 return __o->test_and_set();
}

inline _LIBCPP_INLINE_VISIBILITY
bool
atomic_flag_test_and_set_explicit(volatile atomic_flag* __o, memory_order __m) _NOEXCEPT
{
 return __o->test_and_set(__m);
}

inline _LIBCPP_INLINE_VISIBILITY
bool
atomic_flag_test_and_set_explicit(atomic_flag* __o, memory_order __m) _NOEXCEPT
{
 return __o->test_and_set(__m);
}

inline _LIBCPP_INLINE_VISIBILITY
void
atomic_flag_clear(volatile atomic_flag* __o) _NOEXCEPT
{
 __o->clear();
}

inline _LIBCPP_INLINE_VISIBILITY
void
atomic_flag_clear(atomic_flag* __o) _NOEXCEPT
{
 __o->clear();
}

inline _LIBCPP_INLINE_VISIBILITY
void
atomic_flag_clear_explicit(volatile atomic_flag* __o, memory_order __m) _NOEXCEPT
{
 __o->clear(__m);
}

inline _LIBCPP_INLINE_VISIBILITY
void
atomic_flag_clear_explicit(atomic_flag* __o, memory_order __m) _NOEXCEPT
{
 __o->clear(__m);
}

// fences

inline _LIBCPP_INLINE_VISIBILITY
void
atomic_thread_fence(memory_order __m) _NOEXCEPT
{
 __c11_atomic_thread_fence(__m);
}

inline _LIBCPP_INLINE_VISIBILITY
void
atomic_signal_fence(memory_order __m) _NOEXCEPT
{
 __c11_atomic_signal_fence(__m);
}

// Atomics for standard typedef types

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_t> atomic_char16_t;
typedef atomic<char32_t> atomic_char32_t;
typedef atomic<wchar_t> atomic_wchar_t;

typedef atomic<int_least8_t> atomic_int_least8_t;
typedef atomic<uint_least8_t> atomic_uint_least8_t;
typedef atomic<int_least16_t> atomic_int_least16_t;
typedef atomic<uint_least16_t> atomic_uint_least16_t;
typedef atomic<int_least32_t> atomic_int_least32_t;
typedef atomic<uint_least32_t> atomic_uint_least32_t;
typedef atomic<int_least64_t> atomic_int_least64_t;
typedef atomic<uint_least64_t> atomic_uint_least64_t;

typedef atomic<int_fast8_t> atomic_int_fast8_t;
typedef atomic<uint_fast8_t> atomic_uint_fast8_t;
typedef atomic<int_fast16_t> atomic_int_fast16_t;
typedef atomic<uint_fast16_t> atomic_uint_fast16_t;
typedef atomic<int_fast32_t> atomic_int_fast32_t;
typedef atomic<uint_fast32_t> atomic_uint_fast32_t;
typedef atomic<int_fast64_t> atomic_int_fast64_t;
typedef atomic<uint_fast64_t> atomic_uint_fast64_t;

typedef atomic<intptr_t> atomic_intptr_t;
typedef atomic<uintptr_t> atomic_uintptr_t;
typedef atomic<size_t> atomic_size_t;
typedef atomic<ptrdiff_t> atomic_ptrdiff_t;
typedef atomic<intmax_t> atomic_intmax_t;
typedef atomic<uintmax_t> atomic_uintmax_t;

#define ATOMIC_FLAG_INIT {false}
#define ATOMIC_VAR_INIT(__v) {__v}

// lock-free property

#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

#endif // !__has_feature(cxx_atomic)

_LIBCPP_END_NAMESPACE_STD

#endif // !_LIBCPP_HAS_NO_THREADS

#endif // _LIBCPP_ATOMIC