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|
// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// 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 [version.syn]
#define __cpp_lib_atomic_is_always_lock_free
#define __cpp_lib_atomic_flag_test
#define __cpp_lib_atomic_lock_free_type_aliases
#define __cpp_lib_atomic_wait
// 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_CHAR8_T_LOCK_FREE unspecified // C++20
#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; // until C++20
constexpr atomic() noexcept(is_nothrow_default_constructible_v<T>); // since C++20
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;
using difference_type = value_type;
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*;
using difference_type = ptrdiff_t;
static constexpr bool is_always_lock_free;
bool is_lock_free() const volatile noexcept;
bool is_lock_free() const noexcept;
atomic() noexcept = default; // until C++20
constexpr atomic() noexcept; // since C++20
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;
};
// [atomics.nonmembers], non-member functions
template<class T>
bool atomic_is_lock_free(const volatile atomic<T>*) noexcept;
template<class T>
bool atomic_is_lock_free(const atomic<T>*) noexcept;
template<class T>
void atomic_store(volatile atomic<T>*, atomic<T>::value_type) noexcept;
template<class T>
void atomic_store(atomic<T>*, atomic<T>::value_type) noexcept;
template<class T>
void atomic_store_explicit(volatile atomic<T>*, atomic<T>::value_type,
memory_order) noexcept;
template<class T>
void atomic_store_explicit(atomic<T>*, atomic<T>::value_type,
memory_order) noexcept;
template<class T>
T atomic_load(const volatile atomic<T>*) noexcept;
template<class T>
T atomic_load(const atomic<T>*) noexcept;
template<class T>
T atomic_load_explicit(const volatile atomic<T>*, memory_order) noexcept;
template<class T>
T atomic_load_explicit(const atomic<T>*, memory_order) noexcept;
template<class T>
T atomic_exchange(volatile atomic<T>*, atomic<T>::value_type) noexcept;
template<class T>
T atomic_exchange(atomic<T>*, atomic<T>::value_type) noexcept;
template<class T>
T atomic_exchange_explicit(volatile atomic<T>*, atomic<T>::value_type,
memory_order) noexcept;
template<class T>
T atomic_exchange_explicit(atomic<T>*, atomic<T>::value_type,
memory_order) noexcept;
template<class T>
bool atomic_compare_exchange_weak(volatile atomic<T>*, atomic<T>::value_type*,
atomic<T>::value_type) noexcept;
template<class T>
bool atomic_compare_exchange_weak(atomic<T>*, atomic<T>::value_type*,
atomic<T>::value_type) noexcept;
template<class T>
bool atomic_compare_exchange_strong(volatile atomic<T>*, atomic<T>::value_type*,
atomic<T>::value_type) noexcept;
template<class T>
bool atomic_compare_exchange_strong(atomic<T>*, atomic<T>::value_type*,
atomic<T>::value_type) noexcept;
template<class T>
bool atomic_compare_exchange_weak_explicit(volatile atomic<T>*, atomic<T>::value_type*,
atomic<T>::value_type,
memory_order, memory_order) noexcept;
template<class T>
bool atomic_compare_exchange_weak_explicit(atomic<T>*, atomic<T>::value_type*,
atomic<T>::value_type,
memory_order, memory_order) noexcept;
template<class T>
bool atomic_compare_exchange_strong_explicit(volatile atomic<T>*, atomic<T>::value_type*,
atomic<T>::value_type,
memory_order, memory_order) noexcept;
template<class T>
bool atomic_compare_exchange_strong_explicit(atomic<T>*, atomic<T>::value_type*,
atomic<T>::value_type,
memory_order, memory_order) noexcept;
template<class T>
T atomic_fetch_add(volatile atomic<T>*, atomic<T>::difference_type) noexcept;
template<class T>
T atomic_fetch_add(atomic<T>*, atomic<T>::difference_type) noexcept;
template<class T>
T atomic_fetch_add_explicit(volatile atomic<T>*, atomic<T>::difference_type,
memory_order) noexcept;
template<class T>
T atomic_fetch_add_explicit(atomic<T>*, atomic<T>::difference_type,
memory_order) noexcept;
template<class T>
T atomic_fetch_sub(volatile atomic<T>*, atomic<T>::difference_type) noexcept;
template<class T>
T atomic_fetch_sub(atomic<T>*, atomic<T>::difference_type) noexcept;
template<class T>
T atomic_fetch_sub_explicit(volatile atomic<T>*, atomic<T>::difference_type,
memory_order) noexcept;
template<class T>
T atomic_fetch_sub_explicit(atomic<T>*, atomic<T>::difference_type,
memory_order) noexcept;
template<class T>
T atomic_fetch_and(volatile atomic<T>*, atomic<T>::value_type) noexcept;
template<class T>
T atomic_fetch_and(atomic<T>*, atomic<T>::value_type) noexcept;
template<class T>
T atomic_fetch_and_explicit(volatile atomic<T>*, atomic<T>::value_type,
memory_order) noexcept;
template<class T>
T atomic_fetch_and_explicit(atomic<T>*, atomic<T>::value_type,
memory_order) noexcept;
template<class T>
T atomic_fetch_or(volatile atomic<T>*, atomic<T>::value_type) noexcept;
template<class T>
T atomic_fetch_or(atomic<T>*, atomic<T>::value_type) noexcept;
template<class T>
T atomic_fetch_or_explicit(volatile atomic<T>*, atomic<T>::value_type,
memory_order) noexcept;
template<class T>
T atomic_fetch_or_explicit(atomic<T>*, atomic<T>::value_type,
memory_order) noexcept;
template<class T>
T atomic_fetch_xor(volatile atomic<T>*, atomic<T>::value_type) noexcept;
template<class T>
T atomic_fetch_xor(atomic<T>*, atomic<T>::value_type) noexcept;
template<class T>
T atomic_fetch_xor_explicit(volatile atomic<T>*, atomic<T>::value_type,
memory_order) noexcept;
template<class T>
T atomic_fetch_xor_explicit(atomic<T>*, atomic<T>::value_type,
memory_order) noexcept;
template<class T>
void atomic_wait(const volatile atomic<T>*, atomic<T>::value_type) noexcept;
template<class T>
void atomic_wait(const atomic<T>*, atomic<T>::value_type) noexcept;
template<class T>
void atomic_wait_explicit(const volatile atomic<T>*, atomic<T>::value_type,
memory_order) noexcept;
template<class T>
void atomic_wait_explicit(const atomic<T>*, atomic<T>::value_type,
memory_order) noexcept;
template<class T>
void atomic_notify_one(volatile atomic<T>*) noexcept;
template<class T>
void atomic_notify_one(atomic<T>*) noexcept;
template<class T>
void atomic_notify_all(volatile atomic<T>*) noexcept;
template<class T>
void atomic_notify_all(atomic<T>*) 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<char8_t> atomic_char8_t; // C++20
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; // until C++20
constexpr atomic_flag() noexcept; // since C++20
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, atomic<T>::value_type desr) noexcept;
template <class T>
void atomic_init(atomic<T>* obj, atomic<T>::value_type desr) noexcept;
#define ATOMIC_VAR_INIT(value) see below
#define ATOMIC_FLAG_INIT see below
} // std
*/
#include <__assert> // all public C++ headers provide the assertion handler
#include <__atomic/aliases.h>
#include <__atomic/atomic.h>
#include <__atomic/atomic_base.h>
#include <__atomic/atomic_flag.h>
#include <__atomic/atomic_init.h>
#include <__atomic/atomic_lock_free.h>
#include <__atomic/atomic_sync.h>
#include <__atomic/check_memory_order.h>
#include <__atomic/contention_t.h>
#include <__atomic/cxx_atomic_impl.h>
#include <__atomic/fence.h>
#include <__atomic/is_always_lock_free.h>
#include <__atomic/kill_dependency.h>
#include <__atomic/memory_order.h>
#include <__config>
#include <version>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
#ifdef _LIBCPP_HAS_NO_ATOMIC_HEADER
# error <atomic> is not implemented
#endif
#ifdef kill_dependency
# error <atomic> is incompatible with <stdatomic.h> before C++23. Please compile with -std=c++23.
#endif
#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
# include <cmath>
# include <compare>
# include <cstring>
# include <type_traits>
#endif
#endif // _LIBCPP_ATOMIC
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