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// -*- C++ -*- header. // Copyright (C) 2008-2021 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** @file include/atomic * This is a Standard C++ Library header. */ // Based on "C++ Atomic Types and Operations" by Hans Boehm and Lawrence Crowl. // http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2427.html #ifndef _GLIBCXX_ATOMIC #define _GLIBCXX_ATOMIC 1 #pragma GCC system_header #if __cplusplus < 201103L # include <bits/c++0x_warning.h> #else #include <bits/atomic_base.h> namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION /** * @addtogroup atomics * @{ */ #if __cplusplus >= 201703L # define __cpp_lib_atomic_is_always_lock_free 201603 #endif template<typename _Tp> struct atomic; /// atomic<bool> // NB: No operators or fetch-operations for this type. template<> struct atomic<bool> { using value_type = bool; private: __atomic_base<bool> _M_base; public: atomic() noexcept = default; ~atomic() noexcept = default; atomic(const atomic&) = delete; atomic& operator=(const atomic&) = delete; atomic& operator=(const atomic&) volatile = delete; constexpr atomic(bool __i) noexcept : _M_base(__i) { } bool operator=(bool __i) noexcept { return _M_base.operator=(__i); } bool operator=(bool __i) volatile noexcept { return _M_base.operator=(__i); } operator bool() const noexcept { return _M_base.load(); } operator bool() const volatile noexcept { return _M_base.load(); } bool is_lock_free() const noexcept { return _M_base.is_lock_free(); } bool is_lock_free() const volatile noexcept { return _M_base.is_lock_free(); } #if __cplusplus >= 201703L static constexpr bool is_always_lock_free = ATOMIC_BOOL_LOCK_FREE == 2; #endif void store(bool __i, memory_order __m = memory_order_seq_cst) noexcept { _M_base.store(__i, __m); } void store(bool __i, memory_order __m = memory_order_seq_cst) volatile noexcept { _M_base.store(__i, __m); } bool load(memory_order __m = memory_order_seq_cst) const noexcept { return _M_base.load(__m); } bool load(memory_order __m = memory_order_seq_cst) const volatile noexcept { return _M_base.load(__m); } bool exchange(bool __i, memory_order __m = memory_order_seq_cst) noexcept { return _M_base.exchange(__i, __m); } bool exchange(bool __i, memory_order __m = memory_order_seq_cst) volatile noexcept { return _M_base.exchange(__i, __m); } bool compare_exchange_weak(bool& __i1, bool __i2, memory_order __m1, memory_order __m2) noexcept { return _M_base.compare_exchange_weak(__i1, __i2, __m1, __m2); } bool compare_exchange_weak(bool& __i1, bool __i2, memory_order __m1, memory_order __m2) volatile noexcept { return _M_base.compare_exchange_weak(__i1, __i2, __m1, __m2); } bool compare_exchange_weak(bool& __i1, bool __i2, memory_order __m = memory_order_seq_cst) noexcept { return _M_base.compare_exchange_weak(__i1, __i2, __m); } bool compare_exchange_weak(bool& __i1, bool __i2, memory_order __m = memory_order_seq_cst) volatile noexcept { return _M_base.compare_exchange_weak(__i1, __i2, __m); } bool compare_exchange_strong(bool& __i1, bool __i2, memory_order __m1, memory_order __m2) noexcept { return _M_base.compare_exchange_strong(__i1, __i2, __m1, __m2); } bool compare_exchange_strong(bool& __i1, bool __i2, memory_order __m1, memory_order __m2) volatile noexcept { return _M_base.compare_exchange_strong(__i1, __i2, __m1, __m2); } bool compare_exchange_strong(bool& __i1, bool __i2, memory_order __m = memory_order_seq_cst) noexcept { return _M_base.compare_exchange_strong(__i1, __i2, __m); } bool compare_exchange_strong(bool& __i1, bool __i2, memory_order __m = memory_order_seq_cst) volatile noexcept { return _M_base.compare_exchange_strong(__i1, __i2, __m); } #if __cpp_lib_atomic_wait void wait(bool __old, memory_order __m = memory_order_seq_cst) const noexcept { _M_base.wait(__old, __m); } // TODO add const volatile overload void notify_one() noexcept { _M_base.notify_one(); } void notify_all() noexcept { _M_base.notify_all(); } #endif // __cpp_lib_atomic_wait }; #if __cplusplus <= 201703L # define _GLIBCXX20_INIT(I) #else # define _GLIBCXX20_INIT(I) = I #endif /** * @brief Generic atomic type, primary class template. * * @tparam _Tp Type to be made atomic, must be trivially copyable. */ template<typename _Tp> struct atomic { using value_type = _Tp; private: // Align 1/2/4/8/16-byte types to at least their size. static constexpr int _S_min_alignment = (sizeof(_Tp) & (sizeof(_Tp) - 1)) || sizeof(_Tp) > 16 ? 0 : sizeof(_Tp); static constexpr int _S_alignment = _S_min_alignment > alignof(_Tp) ? _S_min_alignment : alignof(_Tp); alignas(_S_alignment) _Tp _M_i _GLIBCXX20_INIT(_Tp()); static_assert(__is_trivially_copyable(_Tp), "std::atomic requires a trivially copyable type"); static_assert(sizeof(_Tp) > 0, "Incomplete or zero-sized types are not supported"); #if __cplusplus > 201703L static_assert(is_copy_constructible_v<_Tp>); static_assert(is_move_constructible_v<_Tp>); static_assert(is_copy_assignable_v<_Tp>); static_assert(is_move_assignable_v<_Tp>); #endif public: atomic() = default; ~atomic() noexcept = default; atomic(const atomic&) = delete; atomic& operator=(const atomic&) = delete; atomic& operator=(const atomic&) volatile = delete; constexpr atomic(_Tp __i) noexcept : _M_i(__i) { } operator _Tp() const noexcept { return load(); } operator _Tp() const volatile noexcept { return load(); } _Tp operator=(_Tp __i) noexcept { store(__i); return __i; } _Tp operator=(_Tp __i) volatile noexcept { store(__i); return __i; } bool is_lock_free() const noexcept { // Produce a fake, minimally aligned pointer. return __atomic_is_lock_free(sizeof(_M_i), reinterpret_cast<void *>(-_S_alignment)); } bool is_lock_free() const volatile noexcept { // Produce a fake, minimally aligned pointer. return __atomic_is_lock_free(sizeof(_M_i), reinterpret_cast<void *>(-_S_alignment)); } #if __cplusplus >= 201703L static constexpr bool is_always_lock_free = __atomic_always_lock_free(sizeof(_M_i), 0); #endif void store(_Tp __i, memory_order __m = memory_order_seq_cst) noexcept { __atomic_store(std::__addressof(_M_i), std::__addressof(__i), int(__m)); } void store(_Tp __i, memory_order __m = memory_order_seq_cst) volatile noexcept { __atomic_store(std::__addressof(_M_i), std::__addressof(__i), int(__m)); } _Tp load(memory_order __m = memory_order_seq_cst) const noexcept { alignas(_Tp) unsigned char __buf[sizeof(_Tp)]; _Tp* __ptr = reinterpret_cast<_Tp*>(__buf); __atomic_load(std::__addressof(_M_i), __ptr, int(__m)); return *__ptr; } _Tp load(memory_order __m = memory_order_seq_cst) const volatile noexcept { alignas(_Tp) unsigned char __buf[sizeof(_Tp)]; _Tp* __ptr = reinterpret_cast<_Tp*>(__buf); __atomic_load(std::__addressof(_M_i), __ptr, int(__m)); return *__ptr; } _Tp exchange(_Tp __i, memory_order __m = memory_order_seq_cst) noexcept { alignas(_Tp) unsigned char __buf[sizeof(_Tp)]; _Tp* __ptr = reinterpret_cast<_Tp*>(__buf); __atomic_exchange(std::__addressof(_M_i), std::__addressof(__i), __ptr, int(__m)); return *__ptr; } _Tp exchange(_Tp __i, memory_order __m = memory_order_seq_cst) volatile noexcept { alignas(_Tp) unsigned char __buf[sizeof(_Tp)]; _Tp* __ptr = reinterpret_cast<_Tp*>(__buf); __atomic_exchange(std::__addressof(_M_i), std::__addressof(__i), __ptr, int(__m)); return *__ptr; } bool compare_exchange_weak(_Tp& __e, _Tp __i, memory_order __s, memory_order __f) noexcept { __glibcxx_assert(__is_valid_cmpexch_failure_order(__f)); return __atomic_compare_exchange(std::__addressof(_M_i), std::__addressof(__e), std::__addressof(__i), true, int(__s), int(__f)); } bool compare_exchange_weak(_Tp& __e, _Tp __i, memory_order __s, memory_order __f) volatile noexcept { __glibcxx_assert(__is_valid_cmpexch_failure_order(__f)); return __atomic_compare_exchange(std::__addressof(_M_i), std::__addressof(__e), std::__addressof(__i), true, int(__s), int(__f)); } bool compare_exchange_weak(_Tp& __e, _Tp __i, memory_order __m = memory_order_seq_cst) noexcept { return compare_exchange_weak(__e, __i, __m, __cmpexch_failure_order(__m)); } bool compare_exchange_weak(_Tp& __e, _Tp __i, memory_order __m = memory_order_seq_cst) volatile noexcept { return compare_exchange_weak(__e, __i, __m, __cmpexch_failure_order(__m)); } bool compare_exchange_strong(_Tp& __e, _Tp __i, memory_order __s, memory_order __f) noexcept { __glibcxx_assert(__is_valid_cmpexch_failure_order(__f)); return __atomic_compare_exchange(std::__addressof(_M_i), std::__addressof(__e), std::__addressof(__i), false, int(__s), int(__f)); } bool compare_exchange_strong(_Tp& __e, _Tp __i, memory_order __s, memory_order __f) volatile noexcept { __glibcxx_assert(__is_valid_cmpexch_failure_order(__f)); return __atomic_compare_exchange(std::__addressof(_M_i), std::__addressof(__e), std::__addressof(__i), false, int(__s), int(__f)); } bool compare_exchange_strong(_Tp& __e, _Tp __i, memory_order __m = memory_order_seq_cst) noexcept { return compare_exchange_strong(__e, __i, __m, __cmpexch_failure_order(__m)); } bool compare_exchange_strong(_Tp& __e, _Tp __i, memory_order __m = memory_order_seq_cst) volatile noexcept { return compare_exchange_strong(__e, __i, __m, __cmpexch_failure_order(__m)); } #if __cpp_lib_atomic_wait void wait(_Tp __old, memory_order __m = memory_order_seq_cst) const noexcept { std::__atomic_wait_address_v(&_M_i, __old, [__m, this] { return this->load(__m); }); } // TODO add const volatile overload void notify_one() noexcept { std::__atomic_notify_address(&_M_i, false); } void notify_all() noexcept { std::__atomic_notify_address(&_M_i, true); } #endif // __cpp_lib_atomic_wait }; #undef _GLIBCXX20_INIT /// Partial specialization for pointer types. template<typename _Tp> struct atomic<_Tp*> { using value_type = _Tp*; using difference_type = ptrdiff_t; typedef _Tp* __pointer_type; typedef __atomic_base<_Tp*> __base_type; __base_type _M_b; atomic() noexcept = default; ~atomic() noexcept = default; atomic(const atomic&) = delete; atomic& operator=(const atomic&) = delete; atomic& operator=(const atomic&) volatile = delete; constexpr atomic(__pointer_type __p) noexcept : _M_b(__p) { } operator __pointer_type() const noexcept { return __pointer_type(_M_b); } operator __pointer_type() const volatile noexcept { return __pointer_type(_M_b); } __pointer_type operator=(__pointer_type __p) noexcept { return _M_b.operator=(__p); } __pointer_type operator=(__pointer_type __p) volatile noexcept { return _M_b.operator=(__p); } __pointer_type operator++(int) noexcept { #if __cplusplus >= 201703L static_assert( is_object<_Tp>::value, "pointer to object type" ); #endif return _M_b++; } __pointer_type operator++(int) volatile noexcept { #if __cplusplus >= 201703L static_assert( is_object<_Tp>::value, "pointer to object type" ); #endif return _M_b++; } __pointer_type operator--(int) noexcept { #if __cplusplus >= 201703L static_assert( is_object<_Tp>::value, "pointer to object type" ); #endif return _M_b--; } __pointer_type operator--(int) volatile noexcept { #if __cplusplus >= 201703L static_assert( is_object<_Tp>::value, "pointer to object type" ); #endif return _M_b--; } __pointer_type operator++() noexcept { #if __cplusplus >= 201703L static_assert( is_object<_Tp>::value, "pointer to object type" ); #endif return ++_M_b; } __pointer_type operator++() volatile noexcept { #if __cplusplus >= 201703L static_assert( is_object<_Tp>::value, "pointer to object type" ); #endif return ++_M_b; } __pointer_type operator--() noexcept { #if __cplusplus >= 201703L static_assert( is_object<_Tp>::value, "pointer to object type" ); #endif return --_M_b; } __pointer_type operator--() volatile noexcept { #if __cplusplus >= 201703L static_assert( is_object<_Tp>::value, "pointer to object type" ); #endif return --_M_b; } __pointer_type operator+=(ptrdiff_t __d) noexcept { #if __cplusplus >= 201703L static_assert( is_object<_Tp>::value, "pointer to object type" ); #endif return _M_b.operator+=(__d); } __pointer_type operator+=(ptrdiff_t __d) volatile noexcept { #if __cplusplus >= 201703L static_assert( is_object<_Tp>::value, "pointer to object type" ); #endif return _M_b.operator+=(__d); } __pointer_type operator-=(ptrdiff_t __d) noexcept { #if __cplusplus >= 201703L static_assert( is_object<_Tp>::value, "pointer to object type" ); #endif return _M_b.operator-=(__d); } __pointer_type operator-=(ptrdiff_t __d) volatile noexcept { #if __cplusplus >= 201703L static_assert( is_object<_Tp>::value, "pointer to object type" ); #endif return _M_b.operator-=(__d); } bool is_lock_free() const noexcept { return _M_b.is_lock_free(); } bool is_lock_free() const volatile noexcept { return _M_b.is_lock_free(); } #if __cplusplus >= 201703L static constexpr bool is_always_lock_free = ATOMIC_POINTER_LOCK_FREE == 2; #endif void store(__pointer_type __p, memory_order __m = memory_order_seq_cst) noexcept { return _M_b.store(__p, __m); } void store(__pointer_type __p, memory_order __m = memory_order_seq_cst) volatile noexcept { return _M_b.store(__p, __m); } __pointer_type load(memory_order __m = memory_order_seq_cst) const noexcept { return _M_b.load(__m); } __pointer_type load(memory_order __m = memory_order_seq_cst) const volatile noexcept { return _M_b.load(__m); } __pointer_type exchange(__pointer_type __p, memory_order __m = memory_order_seq_cst) noexcept { return _M_b.exchange(__p, __m); } __pointer_type exchange(__pointer_type __p, memory_order __m = memory_order_seq_cst) volatile noexcept { return _M_b.exchange(__p, __m); } bool compare_exchange_weak(__pointer_type& __p1, __pointer_type __p2, memory_order __m1, memory_order __m2) noexcept { return _M_b.compare_exchange_strong(__p1, __p2, __m1, __m2); } bool compare_exchange_weak(__pointer_type& __p1, __pointer_type __p2, memory_order __m1, memory_order __m2) volatile noexcept { return _M_b.compare_exchange_strong(__p1, __p2, __m1, __m2); } bool compare_exchange_weak(__pointer_type& __p1, __pointer_type __p2, memory_order __m = memory_order_seq_cst) noexcept { return compare_exchange_weak(__p1, __p2, __m, __cmpexch_failure_order(__m)); } bool compare_exchange_weak(__pointer_type& __p1, __pointer_type __p2, memory_order __m = memory_order_seq_cst) volatile noexcept { return compare_exchange_weak(__p1, __p2, __m, __cmpexch_failure_order(__m)); } bool compare_exchange_strong(__pointer_type& __p1, __pointer_type __p2, memory_order __m1, memory_order __m2) noexcept { return _M_b.compare_exchange_strong(__p1, __p2, __m1, __m2); } bool compare_exchange_strong(__pointer_type& __p1, __pointer_type __p2, memory_order __m1, memory_order __m2) volatile noexcept { return _M_b.compare_exchange_strong(__p1, __p2, __m1, __m2); } bool compare_exchange_strong(__pointer_type& __p1, __pointer_type __p2, memory_order __m = memory_order_seq_cst) noexcept { return _M_b.compare_exchange_strong(__p1, __p2, __m, __cmpexch_failure_order(__m)); } bool compare_exchange_strong(__pointer_type& __p1, __pointer_type __p2, memory_order __m = memory_order_seq_cst) volatile noexcept { return _M_b.compare_exchange_strong(__p1, __p2, __m, __cmpexch_failure_order(__m)); } #if __cpp_lib_atomic_wait void wait(__pointer_type __old, memory_order __m = memory_order_seq_cst) const noexcept { _M_b.wait(__old, __m); } // TODO add const volatile overload void notify_one() noexcept { _M_b.notify_one(); } void notify_all() noexcept { _M_b.notify_all(); } #endif // __cpp_lib_atomic_wait __pointer_type fetch_add(ptrdiff_t __d, memory_order __m = memory_order_seq_cst) noexcept { #if __cplusplus >= 201703L static_assert( is_object<_Tp>::value, "pointer to object type" ); #endif return _M_b.fetch_add(__d, __m); } __pointer_type fetch_add(ptrdiff_t __d, memory_order __m = memory_order_seq_cst) volatile noexcept { #if __cplusplus >= 201703L static_assert( is_object<_Tp>::value, "pointer to object type" ); #endif return _M_b.fetch_add(__d, __m); } __pointer_type fetch_sub(ptrdiff_t __d, memory_order __m = memory_order_seq_cst) noexcept { #if __cplusplus >= 201703L static_assert( is_object<_Tp>::value, "pointer to object type" ); #endif return _M_b.fetch_sub(__d, __m); } __pointer_type fetch_sub(ptrdiff_t __d, memory_order __m = memory_order_seq_cst) volatile noexcept { #if __cplusplus >= 201703L static_assert( is_object<_Tp>::value, "pointer to object type" ); #endif return _M_b.fetch_sub(__d, __m); } }; /// Explicit specialization for char. template<> struct atomic<char> : __atomic_base<char> { typedef char __integral_type; typedef __atomic_base<char> __base_type; atomic() noexcept = default; ~atomic() noexcept = default; atomic(const atomic&) = delete; atomic& operator=(const atomic&) = delete; atomic& operator=(const atomic&) volatile = delete; constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { } using __base_type::operator __integral_type; using __base_type::operator=; #if __cplusplus >= 201703L static constexpr bool is_always_lock_free = ATOMIC_CHAR_LOCK_FREE == 2; #endif }; /// Explicit specialization for signed char. template<> struct atomic<signed char> : __atomic_base<signed char> { typedef signed char __integral_type; typedef __atomic_base<signed char> __base_type; atomic() noexcept= default; ~atomic() noexcept = default; atomic(const atomic&) = delete; atomic& operator=(const atomic&) = delete; atomic& operator=(const atomic&) volatile = delete; constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { } using __base_type::operator __integral_type; using __base_type::operator=; #if __cplusplus >= 201703L static constexpr bool is_always_lock_free = ATOMIC_CHAR_LOCK_FREE == 2; #endif }; /// Explicit specialization for unsigned char. template<> struct atomic<unsigned char> : __atomic_base<unsigned char> { typedef unsigned char __integral_type; typedef __atomic_base<unsigned char> __base_type; atomic() noexcept= default; ~atomic() noexcept = default; atomic(const atomic&) = delete; atomic& operator=(const atomic&) = delete; atomic& operator=(const atomic&) volatile = delete; constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { } using __base_type::operator __integral_type; using __base_type::operator=; #if __cplusplus >= 201703L static constexpr bool is_always_lock_free = ATOMIC_CHAR_LOCK_FREE == 2; #endif }; /// Explicit specialization for short. template<> struct atomic<short> : __atomic_base<short> { typedef short __integral_type; typedef __atomic_base<short> __base_type; atomic() noexcept = default; ~atomic() noexcept = default; atomic(const atomic&) = delete; atomic& operator=(const atomic&) = delete; atomic& operator=(const atomic&) volatile = delete; constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { } using __base_type::operator __integral_type; using __base_type::operator=; #if __cplusplus >= 201703L static constexpr bool is_always_lock_free = ATOMIC_SHORT_LOCK_FREE == 2; #endif }; /// Explicit specialization for unsigned short. template<> struct atomic<unsigned short> : __atomic_base<unsigned short> { typedef unsigned short __integral_type; typedef __atomic_base<unsigned short> __base_type; atomic() noexcept = default; ~atomic() noexcept = default; atomic(const atomic&) = delete; atomic& operator=(const atomic&) = delete; atomic& operator=(const atomic&) volatile = delete; constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { } using __base_type::operator __integral_type; using __base_type::operator=; #if __cplusplus >= 201703L static constexpr bool is_always_lock_free = ATOMIC_SHORT_LOCK_FREE == 2; #endif }; /// Explicit specialization for int. template<> struct atomic<int> : __atomic_base<int> { typedef int __integral_type; typedef __atomic_base<int> __base_type; atomic() noexcept = default; ~atomic() noexcept = default; atomic(const atomic&) = delete; atomic& operator=(const atomic&) = delete; atomic& operator=(const atomic&) volatile = delete; constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { } using __base_type::operator __integral_type; using __base_type::operator=; #if __cplusplus >= 201703L static constexpr bool is_always_lock_free = ATOMIC_INT_LOCK_FREE == 2; #endif }; /// Explicit specialization for unsigned int. template<> struct atomic<unsigned int> : __atomic_base<unsigned int> { typedef unsigned int __integral_type; typedef __atomic_base<unsigned int> __base_type; atomic() noexcept = default; ~atomic() noexcept = default; atomic(const atomic&) = delete; atomic& operator=(const atomic&) = delete; atomic& operator=(const atomic&) volatile = delete; constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { } using __base_type::operator __integral_type; using __base_type::operator=; #if __cplusplus >= 201703L static constexpr bool is_always_lock_free = ATOMIC_INT_LOCK_FREE == 2; #endif }; /// Explicit specialization for long. template<> struct atomic<long> : __atomic_base<long> { typedef long __integral_type; typedef __atomic_base<long> __base_type; atomic() noexcept = default; ~atomic() noexcept = default; atomic(const atomic&) = delete; atomic& operator=(const atomic&) = delete; atomic& operator=(const atomic&) volatile = delete; constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { } using __base_type::operator __integral_type; using __base_type::operator=; #if __cplusplus >= 201703L static constexpr bool is_always_lock_free = ATOMIC_LONG_LOCK_FREE == 2; #endif }; /// Explicit specialization for unsigned long. template<> struct atomic<unsigned long> : __atomic_base<unsigned long> { typedef unsigned long __integral_type; typedef __atomic_base<unsigned long> __base_type; atomic() noexcept = default; ~atomic() noexcept = default; atomic(const atomic&) = delete; atomic& operator=(const atomic&) = delete; atomic& operator=(const atomic&) volatile = delete; constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { } using __base_type::operator __integral_type; using __base_type::operator=; #if __cplusplus >= 201703L static constexpr bool is_always_lock_free = ATOMIC_LONG_LOCK_FREE == 2; #endif }; /// Explicit specialization for long long. template<> struct atomic<long long> : __atomic_base<long long> { typedef long long __integral_type; typedef __atomic_base<long long> __base_type; atomic() noexcept = default; ~atomic() noexcept = default; atomic(const atomic&) = delete; atomic& operator=(const atomic&) = delete; atomic& operator=(const atomic&) volatile = delete; constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { } using __base_type::operator __integral_type; using __base_type::operator=; #if __cplusplus >= 201703L static constexpr bool is_always_lock_free = ATOMIC_LLONG_LOCK_FREE == 2; #endif }; /// Explicit specialization for unsigned long long. template<> struct atomic<unsigned long long> : __atomic_base<unsigned long long> { typedef unsigned long long __integral_type; typedef __atomic_base<unsigned long long> __base_type; atomic() noexcept = default; ~atomic() noexcept = default; atomic(const atomic&) = delete; atomic& operator=(const atomic&) = delete; atomic& operator=(const atomic&) volatile = delete; constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { } using __base_type::operator __integral_type; using __base_type::operator=; #if __cplusplus >= 201703L static constexpr bool is_always_lock_free = ATOMIC_LLONG_LOCK_FREE == 2; #endif }; /// Explicit specialization for wchar_t. template<> struct atomic<wchar_t> : __atomic_base<wchar_t> { typedef wchar_t __integral_type; typedef __atomic_base<wchar_t> __base_type; atomic() noexcept = default; ~atomic() noexcept = default; atomic(const atomic&) = delete; atomic& operator=(const atomic&) = delete; atomic& operator=(const atomic&) volatile = delete; constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { } using __base_type::operator __integral_type; using __base_type::operator=; #if __cplusplus >= 201703L static constexpr bool is_always_lock_free = ATOMIC_WCHAR_T_LOCK_FREE == 2; #endif }; #ifdef _GLIBCXX_USE_CHAR8_T /// Explicit specialization for char8_t. template<> struct atomic<char8_t> : __atomic_base<char8_t> { typedef char8_t __integral_type; typedef __atomic_base<char8_t> __base_type; atomic() noexcept = default; ~atomic() noexcept = default; atomic(const atomic&) = delete; atomic& operator=(const atomic&) = delete; atomic& operator=(const atomic&) volatile = delete; constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { } using __base_type::operator __integral_type; using __base_type::operator=; #if __cplusplus > 201402L static constexpr bool is_always_lock_free = ATOMIC_CHAR8_T_LOCK_FREE == 2; #endif }; #endif /// Explicit specialization for char16_t. template<> struct atomic<char16_t> : __atomic_base<char16_t> { typedef char16_t __integral_type; typedef __atomic_base<char16_t> __base_type; atomic() noexcept = default; ~atomic() noexcept = default; atomic(const atomic&) = delete; atomic& operator=(const atomic&) = delete; atomic& operator=(const atomic&) volatile = delete; constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { } using __base_type::operator __integral_type; using __base_type::operator=; #if __cplusplus >= 201703L static constexpr bool is_always_lock_free = ATOMIC_CHAR16_T_LOCK_FREE == 2; #endif }; /// Explicit specialization for char32_t. template<> struct atomic<char32_t> : __atomic_base<char32_t> { typedef char32_t __integral_type; typedef __atomic_base<char32_t> __base_type; atomic() noexcept = default; ~atomic() noexcept = default; atomic(const atomic&) = delete; atomic& operator=(const atomic&) = delete; atomic& operator=(const atomic&) volatile = delete; constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { } using __base_type::operator __integral_type; using __base_type::operator=; #if __cplusplus >= 201703L static constexpr bool is_always_lock_free = ATOMIC_CHAR32_T_LOCK_FREE == 2; #endif }; /// atomic_bool typedef atomic<bool> atomic_bool; /// atomic_char typedef atomic<char> atomic_char; /// atomic_schar typedef atomic<signed char> atomic_schar; /// atomic_uchar typedef atomic<unsigned char> atomic_uchar; /// atomic_short typedef atomic<short> atomic_short; /// atomic_ushort typedef atomic<unsigned short> atomic_ushort; /// atomic_int typedef atomic<int> atomic_int; /// atomic_uint typedef atomic<unsigned int> atomic_uint; /// atomic_long typedef atomic<long> atomic_long; /// atomic_ulong typedef atomic<unsigned long> atomic_ulong; /// atomic_llong typedef atomic<long long> atomic_llong; /// atomic_ullong typedef atomic<unsigned long long> atomic_ullong; /// atomic_wchar_t typedef atomic<wchar_t> atomic_wchar_t; #ifdef _GLIBCXX_USE_CHAR8_T /// atomic_char8_t typedef atomic<char8_t> atomic_char8_t; #endif /// atomic_char16_t typedef atomic<char16_t> atomic_char16_t; /// atomic_char32_t typedef atomic<char32_t> atomic_char32_t; #ifdef _GLIBCXX_USE_C99_STDINT_TR1 // _GLIBCXX_RESOLVE_LIB_DEFECTS // 2441. Exact-width atomic typedefs should be provided /// atomic_int8_t typedef atomic<int8_t> atomic_int8_t; /// atomic_uint8_t typedef atomic<uint8_t> atomic_uint8_t; /// atomic_int16_t typedef atomic<int16_t> atomic_int16_t; /// atomic_uint16_t typedef atomic<uint16_t> atomic_uint16_t; /// atomic_int32_t typedef atomic<int32_t> atomic_int32_t; /// atomic_uint32_t typedef atomic<uint32_t> atomic_uint32_t; /// atomic_int64_t typedef atomic<int64_t> atomic_int64_t; /// atomic_uint64_t typedef atomic<uint64_t> atomic_uint64_t; /// atomic_int_least8_t typedef atomic<int_least8_t> atomic_int_least8_t; /// atomic_uint_least8_t typedef atomic<uint_least8_t> atomic_uint_least8_t; /// atomic_int_least16_t typedef atomic<int_least16_t> atomic_int_least16_t; /// atomic_uint_least16_t typedef atomic<uint_least16_t> atomic_uint_least16_t; /// atomic_int_least32_t typedef atomic<int_least32_t> atomic_int_least32_t; /// atomic_uint_least32_t typedef atomic<uint_least32_t> atomic_uint_least32_t; /// atomic_int_least64_t typedef atomic<int_least64_t> atomic_int_least64_t; /// atomic_uint_least64_t typedef atomic<uint_least64_t> atomic_uint_least64_t; /// atomic_int_fast8_t typedef atomic<int_fast8_t> atomic_int_fast8_t; /// atomic_uint_fast8_t typedef atomic<uint_fast8_t> atomic_uint_fast8_t; /// atomic_int_fast16_t typedef atomic<int_fast16_t> atomic_int_fast16_t; /// atomic_uint_fast16_t typedef atomic<uint_fast16_t> atomic_uint_fast16_t; /// atomic_int_fast32_t typedef atomic<int_fast32_t> atomic_int_fast32_t; /// atomic_uint_fast32_t typedef atomic<uint_fast32_t> atomic_uint_fast32_t; /// atomic_int_fast64_t typedef atomic<int_fast64_t> atomic_int_fast64_t; /// atomic_uint_fast64_t typedef atomic<uint_fast64_t> atomic_uint_fast64_t; #endif /// atomic_intptr_t typedef atomic<intptr_t> atomic_intptr_t; /// atomic_uintptr_t typedef atomic<uintptr_t> atomic_uintptr_t; /// atomic_size_t typedef atomic<size_t> atomic_size_t; /// atomic_ptrdiff_t typedef atomic<ptrdiff_t> atomic_ptrdiff_t; #ifdef _GLIBCXX_USE_C99_STDINT_TR1 /// atomic_intmax_t typedef atomic<intmax_t> atomic_intmax_t; /// atomic_uintmax_t typedef atomic<uintmax_t> atomic_uintmax_t; #endif // Function definitions, atomic_flag operations. inline bool atomic_flag_test_and_set_explicit(atomic_flag* __a, memory_order __m) noexcept { return __a->test_and_set(__m); } inline bool atomic_flag_test_and_set_explicit(volatile atomic_flag* __a, memory_order __m) noexcept { return __a->test_and_set(__m); } #if __cpp_lib_atomic_flag_test inline bool atomic_flag_test(const atomic_flag* __a) noexcept { return __a->test(); } inline bool atomic_flag_test(const volatile atomic_flag* __a) noexcept { return __a->test(); } inline bool atomic_flag_test_explicit(const atomic_flag* __a, memory_order __m) noexcept { return __a->test(__m); } inline bool atomic_flag_test_explicit(const volatile atomic_flag* __a, memory_order __m) noexcept { return __a->test(__m); } #endif inline void atomic_flag_clear_explicit(atomic_flag* __a, memory_order __m) noexcept { __a->clear(__m); } inline void atomic_flag_clear_explicit(volatile atomic_flag* __a, memory_order __m) noexcept { __a->clear(__m); } inline bool atomic_flag_test_and_set(atomic_flag* __a) noexcept { return atomic_flag_test_and_set_explicit(__a, memory_order_seq_cst); } inline bool atomic_flag_test_and_set(volatile atomic_flag* __a) noexcept { return atomic_flag_test_and_set_explicit(__a, memory_order_seq_cst); } inline void atomic_flag_clear(atomic_flag* __a) noexcept { atomic_flag_clear_explicit(__a, memory_order_seq_cst); } inline void atomic_flag_clear(volatile atomic_flag* __a) noexcept { atomic_flag_clear_explicit(__a, memory_order_seq_cst); } #if __cpp_lib_atomic_wait inline void atomic_flag_wait(atomic_flag* __a, bool __old) noexcept { __a->wait(__old); } inline void atomic_flag_wait_explicit(atomic_flag* __a, bool __old, memory_order __m) noexcept { __a->wait(__old, __m); } inline void atomic_flag_notify_one(atomic_flag* __a) noexcept { __a->notify_one(); } inline void atomic_flag_notify_all(atomic_flag* __a) noexcept { __a->notify_all(); } #endif // __cpp_lib_atomic_wait /// @cond undocumented // _GLIBCXX_RESOLVE_LIB_DEFECTS // 3220. P0558 broke conforming C++14 uses of atomic shared_ptr template<typename _Tp> using __atomic_val_t = __type_identity_t<_Tp>; template<typename _Tp> using __atomic_diff_t = typename atomic<_Tp>::difference_type; /// @endcond // [atomics.nonmembers] Non-member functions. // Function templates generally applicable to atomic types. template<typename _ITp> inline bool atomic_is_lock_free(const atomic<_ITp>* __a) noexcept { return __a->is_lock_free(); } template<typename _ITp> inline bool atomic_is_lock_free(const volatile atomic<_ITp>* __a) noexcept { return __a->is_lock_free(); } template<typename _ITp> inline void atomic_init(atomic<_ITp>* __a, __atomic_val_t<_ITp> __i) noexcept { __a->store(__i, memory_order_relaxed); } template<typename _ITp> inline void atomic_init(volatile atomic<_ITp>* __a, __atomic_val_t<_ITp> __i) noexcept { __a->store(__i, memory_order_relaxed); } template<typename _ITp> inline void atomic_store_explicit(atomic<_ITp>* __a, __atomic_val_t<_ITp> __i, memory_order __m) noexcept { __a->store(__i, __m); } template<typename _ITp> inline void atomic_store_explicit(volatile atomic<_ITp>* __a, __atomic_val_t<_ITp> __i, memory_order __m) noexcept { __a->store(__i, __m); } template<typename _ITp> inline _ITp atomic_load_explicit(const atomic<_ITp>* __a, memory_order __m) noexcept { return __a->load(__m); } template<typename _ITp> inline _ITp atomic_load_explicit(const volatile atomic<_ITp>* __a, memory_order __m) noexcept { return __a->load(__m); } template<typename _ITp> inline _ITp atomic_exchange_explicit(atomic<_ITp>* __a, __atomic_val_t<_ITp> __i, memory_order __m) noexcept { return __a->exchange(__i, __m); } template<typename _ITp> inline _ITp atomic_exchange_explicit(volatile atomic<_ITp>* __a, __atomic_val_t<_ITp> __i, memory_order __m) noexcept { return __a->exchange(__i, __m); } template<typename _ITp> inline bool atomic_compare_exchange_weak_explicit(atomic<_ITp>* __a, __atomic_val_t<_ITp>* __i1, __atomic_val_t<_ITp> __i2, memory_order __m1, memory_order __m2) noexcept { return __a->compare_exchange_weak(*__i1, __i2, __m1, __m2); } template<typename _ITp> inline bool atomic_compare_exchange_weak_explicit(volatile atomic<_ITp>* __a, __atomic_val_t<_ITp>* __i1, __atomic_val_t<_ITp> __i2, memory_order __m1, memory_order __m2) noexcept { return __a->compare_exchange_weak(*__i1, __i2, __m1, __m2); } template<typename _ITp> inline bool atomic_compare_exchange_strong_explicit(atomic<_ITp>* __a, __atomic_val_t<_ITp>* __i1, __atomic_val_t<_ITp> __i2, memory_order __m1, memory_order __m2) noexcept { return __a->compare_exchange_strong(*__i1, __i2, __m1, __m2); } template<typename _ITp> inline bool atomic_compare_exchange_strong_explicit(volatile atomic<_ITp>* __a, __atomic_val_t<_ITp>* __i1, __atomic_val_t<_ITp> __i2, memory_order __m1, memory_order __m2) noexcept { return __a->compare_exchange_strong(*__i1, __i2, __m1, __m2); } template<typename _ITp> inline void atomic_store(atomic<_ITp>* __a, __atomic_val_t<_ITp> __i) noexcept { atomic_store_explicit(__a, __i, memory_order_seq_cst); } template<typename _ITp> inline void atomic_store(volatile atomic<_ITp>* __a, __atomic_val_t<_ITp> __i) noexcept { atomic_store_explicit(__a, __i, memory_order_seq_cst); } template<typename _ITp> inline _ITp atomic_load(const atomic<_ITp>* __a) noexcept { return atomic_load_explicit(__a, memory_order_seq_cst); } template<typename _ITp> inline _ITp atomic_load(const volatile atomic<_ITp>* __a) noexcept { return atomic_load_explicit(__a, memory_order_seq_cst); } template<typename _ITp> inline _ITp atomic_exchange(atomic<_ITp>* __a, __atomic_val_t<_ITp> __i) noexcept { return atomic_exchange_explicit(__a, __i, memory_order_seq_cst); } template<typename _ITp> inline _ITp atomic_exchange(volatile atomic<_ITp>* __a, __atomic_val_t<_ITp> __i) noexcept { return atomic_exchange_explicit(__a, __i, memory_order_seq_cst); } template<typename _ITp> inline bool atomic_compare_exchange_weak(atomic<_ITp>* __a, __atomic_val_t<_ITp>* __i1, __atomic_val_t<_ITp> __i2) noexcept { return atomic_compare_exchange_weak_explicit(__a, __i1, __i2, memory_order_seq_cst, memory_order_seq_cst); } template<typename _ITp> inline bool atomic_compare_exchange_weak(volatile atomic<_ITp>* __a, __atomic_val_t<_ITp>* __i1, __atomic_val_t<_ITp> __i2) noexcept { return atomic_compare_exchange_weak_explicit(__a, __i1, __i2, memory_order_seq_cst, memory_order_seq_cst); } template<typename _ITp> inline bool atomic_compare_exchange_strong(atomic<_ITp>* __a, __atomic_val_t<_ITp>* __i1, __atomic_val_t<_ITp> __i2) noexcept { return atomic_compare_exchange_strong_explicit(__a, __i1, __i2, memory_order_seq_cst, memory_order_seq_cst); } template<typename _ITp> inline bool atomic_compare_exchange_strong(volatile atomic<_ITp>* __a, __atomic_val_t<_ITp>* __i1, __atomic_val_t<_ITp> __i2) noexcept { return atomic_compare_exchange_strong_explicit(__a, __i1, __i2, memory_order_seq_cst, memory_order_seq_cst); } #if __cpp_lib_atomic_wait template<typename _Tp> inline void atomic_wait(const atomic<_Tp>* __a, typename std::atomic<_Tp>::value_type __old) noexcept { __a->wait(__old); } template<typename _Tp> inline void atomic_wait_explicit(const atomic<_Tp>* __a, typename std::atomic<_Tp>::value_type __old, std::memory_order __m) noexcept { __a->wait(__old, __m); } template<typename _Tp> inline void atomic_notify_one(atomic<_Tp>* __a) noexcept { __a->notify_one(); } template<typename _Tp> inline void atomic_notify_all(atomic<_Tp>* __a) noexcept { __a->notify_all(); } #endif // __cpp_lib_atomic_wait // Function templates for atomic_integral and atomic_pointer operations only. // Some operations (and, or, xor) are only available for atomic integrals, // which is implemented by taking a parameter of type __atomic_base<_ITp>*. template<typename _ITp> inline _ITp atomic_fetch_add_explicit(atomic<_ITp>* __a, __atomic_diff_t<_ITp> __i, memory_order __m) noexcept { return __a->fetch_add(__i, __m); } template<typename _ITp> inline _ITp atomic_fetch_add_explicit(volatile atomic<_ITp>* __a, __atomic_diff_t<_ITp> __i, memory_order __m) noexcept { return __a->fetch_add(__i, __m); } template<typename _ITp> inline _ITp atomic_fetch_sub_explicit(atomic<_ITp>* __a, __atomic_diff_t<_ITp> __i, memory_order __m) noexcept { return __a->fetch_sub(__i, __m); } template<typename _ITp> inline _ITp atomic_fetch_sub_explicit(volatile atomic<_ITp>* __a, __atomic_diff_t<_ITp> __i, memory_order __m) noexcept { return __a->fetch_sub(__i, __m); } template<typename _ITp> inline _ITp atomic_fetch_and_explicit(__atomic_base<_ITp>* __a, __atomic_val_t<_ITp> __i, memory_order __m) noexcept { return __a->fetch_and(__i, __m); } template<typename _ITp> inline _ITp atomic_fetch_and_explicit(volatile __atomic_base<_ITp>* __a, __atomic_val_t<_ITp> __i, memory_order __m) noexcept { return __a->fetch_and(__i, __m); } template<typename _ITp> inline _ITp atomic_fetch_or_explicit(__atomic_base<_ITp>* __a, __atomic_val_t<_ITp> __i, memory_order __m) noexcept { return __a->fetch_or(__i, __m); } template<typename _ITp> inline _ITp atomic_fetch_or_explicit(volatile __atomic_base<_ITp>* __a, __atomic_val_t<_ITp> __i, memory_order __m) noexcept { return __a->fetch_or(__i, __m); } template<typename _ITp> inline _ITp atomic_fetch_xor_explicit(__atomic_base<_ITp>* __a, __atomic_val_t<_ITp> __i, memory_order __m) noexcept { return __a->fetch_xor(__i, __m); } template<typename _ITp> inline _ITp atomic_fetch_xor_explicit(volatile __atomic_base<_ITp>* __a, __atomic_val_t<_ITp> __i, memory_order __m) noexcept { return __a->fetch_xor(__i, __m); } template<typename _ITp> inline _ITp atomic_fetch_add(atomic<_ITp>* __a, __atomic_diff_t<_ITp> __i) noexcept { return atomic_fetch_add_explicit(__a, __i, memory_order_seq_cst); } template<typename _ITp> inline _ITp atomic_fetch_add(volatile atomic<_ITp>* __a, __atomic_diff_t<_ITp> __i) noexcept { return atomic_fetch_add_explicit(__a, __i, memory_order_seq_cst); } template<typename _ITp> inline _ITp atomic_fetch_sub(atomic<_ITp>* __a, __atomic_diff_t<_ITp> __i) noexcept { return atomic_fetch_sub_explicit(__a, __i, memory_order_seq_cst); } template<typename _ITp> inline _ITp atomic_fetch_sub(volatile atomic<_ITp>* __a, __atomic_diff_t<_ITp> __i) noexcept { return atomic_fetch_sub_explicit(__a, __i, memory_order_seq_cst); } template<typename _ITp> inline _ITp atomic_fetch_and(__atomic_base<_ITp>* __a, __atomic_val_t<_ITp> __i) noexcept { return atomic_fetch_and_explicit(__a, __i, memory_order_seq_cst); } template<typename _ITp> inline _ITp atomic_fetch_and(volatile __atomic_base<_ITp>* __a, __atomic_val_t<_ITp> __i) noexcept { return atomic_fetch_and_explicit(__a, __i, memory_order_seq_cst); } template<typename _ITp> inline _ITp atomic_fetch_or(__atomic_base<_ITp>* __a, __atomic_val_t<_ITp> __i) noexcept { return atomic_fetch_or_explicit(__a, __i, memory_order_seq_cst); } template<typename _ITp> inline _ITp atomic_fetch_or(volatile __atomic_base<_ITp>* __a, __atomic_val_t<_ITp> __i) noexcept { return atomic_fetch_or_explicit(__a, __i, memory_order_seq_cst); } template<typename _ITp> inline _ITp atomic_fetch_xor(__atomic_base<_ITp>* __a, __atomic_val_t<_ITp> __i) noexcept { return atomic_fetch_xor_explicit(__a, __i, memory_order_seq_cst); } template<typename _ITp> inline _ITp atomic_fetch_xor(volatile __atomic_base<_ITp>* __a, __atomic_val_t<_ITp> __i) noexcept { return atomic_fetch_xor_explicit(__a, __i, memory_order_seq_cst); } #if __cplusplus > 201703L #define __cpp_lib_atomic_float 201711L template<> struct atomic<float> : __atomic_float<float> { atomic() noexcept = default; constexpr atomic(float __fp) noexcept : __atomic_float<float>(__fp) { } atomic& operator=(const atomic&) volatile = delete; atomic& operator=(const atomic&) = delete; using __atomic_float<float>::operator=; }; template<> struct atomic<double> : __atomic_float<double> { atomic() noexcept = default; constexpr atomic(double __fp) noexcept : __atomic_float<double>(__fp) { } atomic& operator=(const atomic&) volatile = delete; atomic& operator=(const atomic&) = delete; using __atomic_float<double>::operator=; }; template<> struct atomic<long double> : __atomic_float<long double> { atomic() noexcept = default; constexpr atomic(long double __fp) noexcept : __atomic_float<long double>(__fp) { } atomic& operator=(const atomic&) volatile = delete; atomic& operator=(const atomic&) = delete; using __atomic_float<long double>::operator=; }; #define __cpp_lib_atomic_ref 201806L /// Class template to provide atomic operations on a non-atomic variable. template<typename _Tp> struct atomic_ref : __atomic_ref<_Tp> { explicit atomic_ref(_Tp& __t) noexcept : __atomic_ref<_Tp>(__t) { } atomic_ref& operator=(const atomic_ref&) = delete; atomic_ref(const atomic_ref&) = default; using __atomic_ref<_Tp>::operator=; }; #endif // C++2a /// @} group atomics _GLIBCXX_END_NAMESPACE_VERSION } // namespace #endif // C++11 #endif // _GLIBCXX_ATOMIC
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