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atomic
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atomic
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// -*- C++ -*-
//===--------------------------- atomic -----------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP_ATOMIC
#define _LIBCPP_ATOMIC
/*
atomic synopsis
namespace std
{
// feature test macro
#define __cpp_lib_atomic_is_always_lock_free // as specified by SG10
// order and consistency
enum memory_order: unspecified // enum class in C++20
{
relaxed,
consume, // load-consume
acquire, // load-acquire
release, // store-release
acq_rel, // store-release load-acquire
seq_cst // store-release load-acquire
};
inline constexpr auto memory_order_relaxed = memory_order::relaxed;
inline constexpr auto memory_order_consume = memory_order::consume;
inline constexpr auto memory_order_acquire = memory_order::acquire;
inline constexpr auto memory_order_release = memory_order::release;
inline constexpr auto memory_order_acq_rel = memory_order::acq_rel;
inline constexpr auto memory_order_seq_cst = memory_order::seq_cst;
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
template <class T>
struct atomic
{
using value_type = T;
static constexpr bool is_always_lock_free;
bool is_lock_free() const volatile noexcept;
bool is_lock_free() const 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 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;
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 operator=(T) volatile noexcept;
T operator=(T) 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;
void wait(T, memory_order = memory_order::seq_cst) const volatile noexcept;
void wait(T, memory_order = memory_order::seq_cst) const noexcept;
void notify_one() volatile noexcept;
void notify_one() noexcept;
void notify_all() volatile noexcept;
void notify_all() noexcept;
};
template <>
struct atomic<integral>
{
using value_type = integral;
static constexpr bool is_always_lock_free;
bool is_lock_free() const volatile noexcept;
bool is_lock_free() const 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 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;
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 operator=(integral desr) volatile noexcept;
integral operator=(integral desr) 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;
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;
void wait(integral, memory_order = memory_order::seq_cst) const volatile noexcept;
void wait(integral, memory_order = memory_order::seq_cst) const noexcept;
void notify_one() volatile noexcept;
void notify_one() noexcept;
void notify_all() volatile noexcept;
void notify_all() noexcept;
};
template <class T>
struct atomic<T*>
{
using value_type = T*;
static constexpr bool is_always_lock_free;
bool is_lock_free() const volatile noexcept;
bool is_lock_free() const 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* 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;
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* operator=(T*) volatile noexcept;
T* operator=(T*) 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;
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;
void wait(T*, memory_order = memory_order::seq_cst) const volatile noexcept;
void wait(T*, memory_order = memory_order::seq_cst) const noexcept;
void notify_one() volatile noexcept;
void notify_one() noexcept;
void notify_all() volatile noexcept;
void notify_all() 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_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 T>
void atomic_wait(const volatile atomic<T>* obj, T old) noexcept;
template <class T>
void atomic_wait(const atomic<T>* obj, T old) noexcept;
template <class T>
void atomic_wait_explicit(const volatile atomic<T>* obj, T old, memory_order m) noexcept;
template <class T>
void atomic_wait_explicit(const atomic<T>* obj, T old, memory_order m) noexcept;
template <class T>
void atomic_one(volatile atomic<T>* obj) noexcept;
template <class T>
void atomic_one(atomic<T>* obj) noexcept;
template <class T>
void atomic_all(volatile atomic<T>* obj) noexcept;
template <class T>
void atomic_all(atomic<T>* obj) 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<int8_t> atomic_int8_t;
typedef atomic<uint8_t> atomic_uint8_t;
typedef atomic<int16_t> atomic_int16_t;
typedef atomic<uint16_t> atomic_uint16_t;
typedef atomic<int32_t> atomic_int32_t;
typedef atomic<uint32_t> atomic_uint32_t;
typedef atomic<int64_t> atomic_int64_t;
typedef atomic<uint64_t> atomic_uint64_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;
// flag type and operations
typedef struct atomic_flag
{
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;
bool test(memory_order m = memory_order_seq_cst) volatile noexcept;
bool test(memory_order m = memory_order_seq_cst) noexcept;
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;
void wait(bool, memory_order = memory_order::seq_cst) const volatile noexcept;
void wait(bool, memory_order = memory_order::seq_cst) const noexcept;
void notify_one() volatile noexcept;
void notify_one() noexcept;
void notify_all() volatile noexcept;
void notify_all() noexcept;
} atomic_flag;
bool atomic_flag_test(volatile atomic_flag* obj) noexcept;
bool atomic_flag_test(atomic_flag* obj) noexcept;
bool atomic_flag_test_explicit(volatile atomic_flag* obj,
memory_order m) noexcept;
bool atomic_flag_test_explicit(atomic_flag* obj, memory_order m) noexcept;
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;
void atomic_wait(const volatile atomic_flag* obj, T old) noexcept;
void atomic_wait(const atomic_flag* obj, T old) noexcept;
void atomic_wait_explicit(const volatile atomic_flag* obj, T old, memory_order m) noexcept;
void atomic_wait_explicit(const atomic_flag* obj, T old, memory_order m) noexcept;
void atomic_one(volatile atomic_flag* obj) noexcept;
void atomic_one(atomic_flag* obj) noexcept;
void atomic_all(volatile atomic_flag* obj) noexcept;
void atomic_all(atomic_flag* obj) noexcept;
// fences
void atomic_thread_fence(memory_order m) noexcept;
void atomic_signal_fence(memory_order m) noexcept;
// deprecated
template <class T>
void atomic_init(volatile atomic<T>* obj, typename atomic<T>::value_type desr) noexcept;
template <class T>
void atomic_init(atomic<T>* obj, typename atomic<T>::value_type desr) noexcept;
#define ATOMIC_VAR_INIT(value) see below
#define ATOMIC_FLAG_INIT see below
} // std
*/
#include <__config>
#include <__threading_support>
#include <cstddef>
#include <cstdint>
#include <cstring>
#include <type_traits>
#include <version>
#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
#endif
#ifdef _LIBCPP_HAS_NO_ATOMIC_HEADER
# error <atomic> is not implemented
#endif
#ifdef kill_dependency
# error C++ standard library is incompatible with <stdatomic.h>
#endif
#define _LIBCPP_CHECK_STORE_MEMORY_ORDER(__m) \
_LIBCPP_DIAGNOSE_WARNING(__m == memory_order_consume || \
__m == memory_order_acquire || \
__m == memory_order_acq_rel, \
"memory order argument to atomic operation is invalid")
#define _LIBCPP_CHECK_LOAD_MEMORY_ORDER(__m) \
_LIBCPP_DIAGNOSE_WARNING(__m == memory_order_release || \
__m == memory_order_acq_rel, \
"memory order argument to atomic operation is invalid")
#define _LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__m, __f) \
_LIBCPP_DIAGNOSE_WARNING(__f == memory_order_release || \
__f == memory_order_acq_rel, \
"memory order argument to atomic operation is invalid")
_LIBCPP_BEGIN_NAMESPACE_STD
// Figure out what the underlying type for `memory_order` would be if it were
// declared as an unscoped enum (accounting for -fshort-enums). Use this result
// to pin the underlying type in C++20.
enum __legacy_memory_order {
__mo_relaxed,
__mo_consume,
__mo_acquire,
__mo_release,
__mo_acq_rel,
__mo_seq_cst
};
typedef underlying_type<__legacy_memory_order>::type __memory_order_underlying_t;
#if _LIBCPP_STD_VER > 17
enum class memory_order : __memory_order_underlying_t {
relaxed = __mo_relaxed,
consume = __mo_consume,
acquire = __mo_acquire,
release = __mo_release,
acq_rel = __mo_acq_rel,
seq_cst = __mo_seq_cst
};
inline constexpr auto memory_order_relaxed = memory_order::relaxed;
inline constexpr auto memory_order_consume = memory_order::consume;
inline constexpr auto memory_order_acquire = memory_order::acquire;
inline constexpr auto memory_order_release = memory_order::release;
inline constexpr auto memory_order_acq_rel = memory_order::acq_rel;
inline constexpr auto memory_order_seq_cst = memory_order::seq_cst;
#else
typedef enum memory_order {
memory_order_relaxed = __mo_relaxed,
memory_order_consume = __mo_consume,
memory_order_acquire = __mo_acquire,
memory_order_release = __mo_release,
memory_order_acq_rel = __mo_acq_rel,
memory_order_seq_cst = __mo_seq_cst,
} memory_order;
#endif // _LIBCPP_STD_VER > 17
template <typename _Tp> _LIBCPP_INLINE_VISIBILITY
bool __cxx_nonatomic_compare_equal(_Tp const& __lhs, _Tp const& __rhs) {
return memcmp(&__lhs, &__rhs, sizeof(_Tp)) == 0;
}
static_assert((is_same<underlying_type<memory_order>::type, __memory_order_underlying_t>::value),
"unexpected underlying type for std::memory_order");
#if defined(_LIBCPP_HAS_GCC_ATOMIC_IMP) || \
defined(_LIBCPP_ATOMIC_ONLY_USE_BUILTINS)
// [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.
template <typename _Tp, typename _Tv> _LIBCPP_INLINE_VISIBILITY
typename enable_if<is_assignable<_Tp&, _Tv>::value>::type
__cxx_atomic_assign_volatile(_Tp& __a_value, _Tv const& __val) {
__a_value = __val;
}
template <typename _Tp, typename _Tv> _LIBCPP_INLINE_VISIBILITY
typename enable_if<is_assignable<_Tp&, _Tv>::value>::type
__cxx_atomic_assign_volatile(_Tp volatile& __a_value, _Tv volatile const& __val) {
volatile char* __to = reinterpret_cast<volatile char*>(&__a_value);
volatile char* __end = __to + sizeof(_Tp);
volatile const char* __from = reinterpret_cast<volatile const char*>(&__val);
while (__to != __end)
*__to++ = *__from++;
}
#endif
#if defined(_LIBCPP_HAS_GCC_ATOMIC_IMP)
template <typename _Tp>
struct __cxx_atomic_base_impl {
_LIBCPP_INLINE_VISIBILITY
#ifndef _LIBCPP_CXX03_LANG
__cxx_atomic_base_impl() _NOEXCEPT = default;
#else
__cxx_atomic_base_impl() _NOEXCEPT : __a_value() {}
#endif // _LIBCPP_CXX03_LANG
_LIBCPP_CONSTEXPR explicit __cxx_atomic_base_impl(_Tp value) _NOEXCEPT
: __a_value(value) {}
_Tp __a_value;
};
_LIBCPP_INLINE_VISIBILITY inline _LIBCPP_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))));
}
_LIBCPP_INLINE_VISIBILITY inline _LIBCPP_CONSTEXPR int __to_gcc_failure_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_RELAXED:
(__order == memory_order_seq_cst ? __ATOMIC_SEQ_CST:
(__order == memory_order_acq_rel ? __ATOMIC_ACQUIRE:
__ATOMIC_CONSUME))));
}
template <typename _Tp>
_LIBCPP_INLINE_VISIBILITY
void __cxx_atomic_init(volatile __cxx_atomic_base_impl<_Tp>* __a, _Tp __val) {
__cxx_atomic_assign_volatile(__a->__a_value, __val);
}
template <typename _Tp>
_LIBCPP_INLINE_VISIBILITY
void __cxx_atomic_init(__cxx_atomic_base_impl<_Tp>* __a, _Tp __val) {
__a->__a_value = __val;
}
_LIBCPP_INLINE_VISIBILITY inline
void __cxx_atomic_thread_fence(memory_order __order) {
__atomic_thread_fence(__to_gcc_order(__order));
}
_LIBCPP_INLINE_VISIBILITY inline
void __cxx_atomic_signal_fence(memory_order __order) {
__atomic_signal_fence(__to_gcc_order(__order));
}
template <typename _Tp>
_LIBCPP_INLINE_VISIBILITY
void __cxx_atomic_store(volatile __cxx_atomic_base_impl<_Tp>* __a, _Tp __val,
memory_order __order) {
__atomic_store(&__a->__a_value, &__val,
__to_gcc_order(__order));
}
template <typename _Tp>
_LIBCPP_INLINE_VISIBILITY
void __cxx_atomic_store(__cxx_atomic_base_impl<_Tp>* __a, _Tp __val,
memory_order __order) {
__atomic_store(&__a->__a_value, &__val,
__to_gcc_order(__order));
}
template <typename _Tp>
_LIBCPP_INLINE_VISIBILITY
_Tp __cxx_atomic_load(const volatile __cxx_atomic_base_impl<_Tp>* __a,
memory_order __order) {
_Tp __ret;
__atomic_load(&__a->__a_value, &__ret,
__to_gcc_order(__order));
return __ret;
}
template <typename _Tp>
_LIBCPP_INLINE_VISIBILITY
_Tp __cxx_atomic_load(const __cxx_atomic_base_impl<_Tp>* __a, memory_order __order) {
_Tp __ret;
__atomic_load(&__a->__a_value, &__ret,
__to_gcc_order(__order));
return __ret;
}
template <typename _Tp>
_LIBCPP_INLINE_VISIBILITY
_Tp __cxx_atomic_exchange(volatile __cxx_atomic_base_impl<_Tp>* __a,
_Tp __value, memory_order __order) {
_Tp __ret;
__atomic_exchange(&__a->__a_value, &__value, &__ret,
__to_gcc_order(__order));
return __ret;
}
template <typename _Tp>
_LIBCPP_INLINE_VISIBILITY
_Tp __cxx_atomic_exchange(__cxx_atomic_base_impl<_Tp>* __a, _Tp __value,
memory_order __order) {
_Tp __ret;
__atomic_exchange(&__a->__a_value, &__value, &__ret,
__to_gcc_order(__order));
return __ret;
}
template <typename _Tp>
_LIBCPP_INLINE_VISIBILITY
bool __cxx_atomic_compare_exchange_strong(
volatile __cxx_atomic_base_impl<_Tp>* __a, _Tp* __expected, _Tp __value,
memory_order __success, memory_order __failure) {
return __atomic_compare_exchange(&__a->__a_value, __expected, &__value,
false,
__to_gcc_order(__success),
__to_gcc_failure_order(__failure));
}
template <typename _Tp>
_LIBCPP_INLINE_VISIBILITY
bool __cxx_atomic_compare_exchange_strong(
__cxx_atomic_base_impl<_Tp>* __a, _Tp* __expected, _Tp __value, memory_order __success,
memory_order __failure) {
return __atomic_compare_exchange(&__a->__a_value, __expected, &__value,
false,
__to_gcc_order(__success),
__to_gcc_failure_order(__failure));
}
template <typename _Tp>
_LIBCPP_INLINE_VISIBILITY
bool __cxx_atomic_compare_exchange_weak(
volatile __cxx_atomic_base_impl<_Tp>* __a, _Tp* __expected, _Tp __value,
memory_order __success, memory_order __failure) {
return __atomic_compare_exchange(&__a->__a_value, __expected, &__value,
true,
__to_gcc_order(__success),
__to_gcc_failure_order(__failure));
}
template <typename _Tp>
_LIBCPP_INLINE_VISIBILITY
bool __cxx_atomic_compare_exchange_weak(
__cxx_atomic_base_impl<_Tp>* __a, _Tp* __expected, _Tp __value, memory_order __success,
memory_order __failure) {
return __atomic_compare_exchange(&__a->__a_value, __expected, &__value,
true,
__to_gcc_order(__success),
__to_gcc_failure_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>
_LIBCPP_INLINE_VISIBILITY
_Tp __cxx_atomic_fetch_add(volatile __cxx_atomic_base_impl<_Tp>* __a,
_Td __delta, memory_order __order) {
return __atomic_fetch_add(&__a->__a_value, __delta * __skip_amt<_Tp>::value,
__to_gcc_order(__order));
}
template <typename _Tp, typename _Td>
_LIBCPP_INLINE_VISIBILITY
_Tp __cxx_atomic_fetch_add(__cxx_atomic_base_impl<_Tp>* __a, _Td __delta,
memory_order __order) {
return __atomic_fetch_add(&__a->__a_value, __delta * __skip_amt<_Tp>::value,
__to_gcc_order(__order));
}
template <typename _Tp, typename _Td>
_LIBCPP_INLINE_VISIBILITY
_Tp __cxx_atomic_fetch_sub(volatile __cxx_atomic_base_impl<_Tp>* __a,
_Td __delta, memory_order __order) {
return __atomic_fetch_sub(&__a->__a_value, __delta * __skip_amt<_Tp>::value,
__to_gcc_order(__order));
}
template <typename _Tp, typename _Td>
_LIBCPP_INLINE_VISIBILITY
_Tp __cxx_atomic_fetch_sub(__cxx_atomic_base_impl<_Tp>* __a, _Td __delta,
memory_order __order) {
return __atomic_fetch_sub(&__a->__a_value, __delta * __skip_amt<_Tp>::value,
__to_gcc_order(__order));
}
template <typename _Tp>
_LIBCPP_INLINE_VISIBILITY
_Tp __cxx_atomic_fetch_and(volatile __cxx_atomic_base_impl<_Tp>* __a,
_Tp __pattern, memory_order __order) {
return __atomic_fetch_and(&__a->__a_value, __pattern,
__to_gcc_order(__order));
}
template <typename _Tp>
_LIBCPP_INLINE_VISIBILITY
_Tp __cxx_atomic_fetch_and(__cxx_atomic_base_impl<_Tp>* __a,
_Tp __pattern, memory_order __order) {
return __atomic_fetch_and(&__a->__a_value, __pattern,
__to_gcc_order(__order));
}
template <typename _Tp>
_LIBCPP_INLINE_VISIBILITY
_Tp __cxx_atomic_fetch_or(volatile __cxx_atomic_base_impl<_Tp>* __a,
_Tp __pattern, memory_order __order) {
return __atomic_fetch_or(&__a->__a_value, __pattern,
__to_gcc_order(__order));
}
template <typename _Tp>
_LIBCPP_INLINE_VISIBILITY
_Tp __cxx_atomic_fetch_or(__cxx_atomic_base_impl<_Tp>* __a, _Tp __pattern,
memory_order __order) {
return __atomic_fetch_or(&__a->__a_value, __pattern,
__to_gcc_order(__order));
}
template <typename _Tp>
_LIBCPP_INLINE_VISIBILITY
_Tp __cxx_atomic_fetch_xor(volatile __cxx_atomic_base_impl<_Tp>* __a,
_Tp __pattern, memory_order __order) {
return __atomic_fetch_xor(&__a->__a_value, __pattern,
__to_gcc_order(__order));
}
template <typename _Tp>
_LIBCPP_INLINE_VISIBILITY
_Tp __cxx_atomic_fetch_xor(__cxx_atomic_base_impl<_Tp>* __a, _Tp __pattern,
memory_order __order) {
return __atomic_fetch_xor(&__a->__a_value, __pattern,
__to_gcc_order(__order));
}
#define __cxx_atomic_is_lock_free(__s) __atomic_is_lock_free(__s, 0)
#elif defined(_LIBCPP_HAS_C_ATOMIC_IMP)
template <typename _Tp>
struct __cxx_atomic_base_impl {
_LIBCPP_INLINE_VISIBILITY
#ifndef _LIBCPP_CXX03_LANG
__cxx_atomic_base_impl() _NOEXCEPT = default;
#else
__cxx_atomic_base_impl() _NOEXCEPT : __a_value() {}
#endif // _LIBCPP_CXX03_LANG
_LIBCPP_CONSTEXPR explicit __cxx_atomic_base_impl(_Tp value) _NOEXCEPT
: __a_value(value) {}
_LIBCPP_DISABLE_EXTENSION_WARNING _Atomic(_Tp) __a_value;
};
#define __cxx_atomic_is_lock_free(__s) __c11_atomic_is_lock_free(__s)
_LIBCPP_INLINE_VISIBILITY inline
void __cxx_atomic_thread_fence(memory_order __order) _NOEXCEPT {
__c11_atomic_thread_fence(static_cast<__memory_order_underlying_t>(__order));
}
_LIBCPP_INLINE_VISIBILITY inline
void __cxx_atomic_signal_fence(memory_order __order) _NOEXCEPT {
__c11_atomic_signal_fence(static_cast<__memory_order_underlying_t>(__order));
}
template<class _Tp>
_LIBCPP_INLINE_VISIBILITY
void __cxx_atomic_init(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __val) _NOEXCEPT {
__c11_atomic_init(&__a->__a_value, __val);
}
template<class _Tp>
_LIBCPP_INLINE_VISIBILITY
void __cxx_atomic_init(__cxx_atomic_base_impl<_Tp> * __a, _Tp __val) _NOEXCEPT {
__c11_atomic_init(&__a->__a_value, __val);
}
template<class _Tp>
_LIBCPP_INLINE_VISIBILITY
void __cxx_atomic_store(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __val, memory_order __order) _NOEXCEPT {
__c11_atomic_store(&__a->__a_value, __val, static_cast<__memory_order_underlying_t>(__order));
}
template<class _Tp>
_LIBCPP_INLINE_VISIBILITY
void __cxx_atomic_store(__cxx_atomic_base_impl<_Tp> * __a, _Tp __val, memory_order __order) _NOEXCEPT {
__c11_atomic_store(&__a->__a_value, __val, static_cast<__memory_order_underlying_t>(__order));
}
template<class _Tp>
_LIBCPP_INLINE_VISIBILITY
_Tp __cxx_atomic_load(__cxx_atomic_base_impl<_Tp> const volatile* __a, memory_order __order) _NOEXCEPT {
using __ptr_type = typename remove_const<decltype(__a->__a_value)>::type*;
return __c11_atomic_load(const_cast<__ptr_type>(&__a->__a_value), static_cast<__memory_order_underlying_t>(__order));
}
template<class _Tp>
_LIBCPP_INLINE_VISIBILITY
_Tp __cxx_atomic_load(__cxx_atomic_base_impl<_Tp> const* __a, memory_order __order) _NOEXCEPT {
using __ptr_type = typename remove_const<decltype(__a->__a_value)>::type*;
return __c11_atomic_load(const_cast<__ptr_type>(&__a->__a_value), static_cast<__memory_order_underlying_t>(__order));
}