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Edit File : atomic_base.h \| Size : 23.28 KB
// -- C++ -- header. // Copyright (C) 2008-2018 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 bits/atomic_base.h * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{atomic} / #ifndef _GLIBCXX_ATOMIC_BASE_H #define _GLIBCXX_ATOMIC_BASE_H 1 #pragma GCC system_header #include <bits/c++config.h> #include <stdint.h> #include <bits/atomic_lockfree_defines.h> #ifndef _GLIBCXX_ALWAYS_INLINE #define _GLIBCXX_ALWAYS_INLINE inline __attribute__((__always_inline__)) #endif namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION /* * @defgroup atomics Atomics * * Components for performing atomic operations. * @{ / /// Enumeration for memory_order typedef enum memory_order { memory_order_relaxed, memory_order_consume, memory_order_acquire, memory_order_release, memory_order_acq_rel, memory_order_seq_cst } memory_order; enum __memory_order_modifier { __memory_order_mask = 0x0ffff, __memory_order_modifier_mask = 0xffff0000, __memory_order_hle_acquire = 0x10000, __memory_order_hle_release = 0x20000 }; constexpr memory_order operator\|(memory_order __m, __memory_order_modifier __mod) { return memory_order(__m \| int(__mod)); } constexpr memory_order operator&(memory_order __m, __memory_order_modifier __mod) { return memory_order(__m & int(__mod)); } // Drop release ordering as per [atomics.types.operations.req]/21 constexpr memory_order __cmpexch_failure_order2(memory_order __m) noexcept { return __m == memory_order_acq_rel ? memory_order_acquire : __m == memory_order_release ? memory_order_relaxed : __m; } constexpr memory_order __cmpexch_failure_order(memory_order __m) noexcept { return memory_order(__cmpexch_failure_order2(__m & __memory_order_mask) \| (__m & __memory_order_modifier_mask)); } _GLIBCXX_ALWAYS_INLINE void atomic_thread_fence(memory_order __m) noexcept { __atomic_thread_fence(__m); } _GLIBCXX_ALWAYS_INLINE void atomic_signal_fence(memory_order __m) noexcept { __atomic_signal_fence(__m); } /// kill_dependency template<typename _Tp> inline _Tp kill_dependency(_Tp __y) noexcept { _Tp __ret(__y); return __ret; } // Base types for atomics. template<typename _IntTp> struct __atomic_base; #define ATOMIC_VAR_INIT(_VI) { _VI } template<typename _Tp> struct atomic; template<typename _Tp> struct atomic<_Tp>; /* The target's "set" value for test-and-set may not be exactly 1. / #if __GCC_ATOMIC_TEST_AND_SET_TRUEVAL == 1 typedef bool __atomic_flag_data_type; #else typedef unsigned char __atomic_flag_data_type; #endif /* * @brief Base type for atomic_flag. * * Base type is POD with data, allowing atomic_flag to derive from * it and meet the standard layout type requirement. In addition to * compatibility with a C interface, this allows different * implementations of atomic_flag to use the same atomic operation * functions, via a standard conversion to the __atomic_flag_base * argument. / _GLIBCXX_BEGIN_EXTERN_C struct __atomic_flag_base { __atomic_flag_data_type _M_i; }; _GLIBCXX_END_EXTERN_C #define ATOMIC_FLAG_INIT { 0 } /// atomic_flag struct atomic_flag : public __atomic_flag_base { atomic_flag() noexcept = default; ~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; // Conversion to ATOMIC_FLAG_INIT. constexpr atomic_flag(bool __i) noexcept : __atomic_flag_base{ _S_init(__i) } { } _GLIBCXX_ALWAYS_INLINE bool test_and_set(memory_order __m = memory_order_seq_cst) noexcept { return __atomic_test_and_set (&_M_i, __m); } _GLIBCXX_ALWAYS_INLINE bool test_and_set(memory_order __m = memory_order_seq_cst) volatile noexcept { return __atomic_test_and_set (&_M_i, __m); } _GLIBCXX_ALWAYS_INLINE void clear(memory_order __m = memory_order_seq_cst) noexcept { memory_order __b = __m & __memory_order_mask; __glibcxx_assert(__b != memory_order_consume); __glibcxx_assert(__b != memory_order_acquire); __glibcxx_assert(__b != memory_order_acq_rel); __atomic_clear (&_M_i, __m); } _GLIBCXX_ALWAYS_INLINE void clear(memory_order __m = memory_order_seq_cst) volatile noexcept { memory_order __b = __m & __memory_order_mask; __glibcxx_assert(__b != memory_order_consume); __glibcxx_assert(__b != memory_order_acquire); __glibcxx_assert(__b != memory_order_acq_rel); __atomic_clear (&_M_i, __m); } private: static constexpr __atomic_flag_data_type _S_init(bool __i) { return __i ? __GCC_ATOMIC_TEST_AND_SET_TRUEVAL : 0; } }; /// Base class for atomic integrals. // // For each of the integral types, define atomic_[integral type] struct // // atomic_bool bool // atomic_char char // atomic_schar signed char // atomic_uchar unsigned char // atomic_short short // atomic_ushort unsigned short // atomic_int int // atomic_uint unsigned int // atomic_long long // atomic_ulong unsigned long // atomic_llong long long // atomic_ullong unsigned long long // atomic_char16_t char16_t // atomic_char32_t char32_t // atomic_wchar_t wchar_t // // NB: Assuming _ITp is an integral scalar type that is 1, 2, 4, or // 8 bytes, since that is what GCC built-in functions for atomic // memory access expect. template<typename _ITp> struct __atomic_base { private: typedef _ITp __int_type; static constexpr int _S_alignment = sizeof(_ITp) > alignof(_ITp) ? sizeof(_ITp) : alignof(_ITp); alignas(_S_alignment) __int_type _M_i; public: __atomic_base() noexcept = default; ~__atomic_base() noexcept = default; __atomic_base(const __atomic_base&) = delete; __atomic_base& operator=(const __atomic_base&) = delete; __atomic_base& operator=(const __atomic_base&) volatile = delete; // Requires __int_type convertible to _M_i. constexpr __atomic_base(__int_type __i) noexcept : _M_i (__i) { } operator __int_type() const noexcept { return load(); } operator __int_type() const volatile noexcept { return load(); } __int_type operator=(__int_type __i) noexcept { store(__i); return __i; } __int_type operator=(__int_type __i) volatile noexcept { store(__i); return __i; } __int_type operator++(int) noexcept { return fetch_add(1); } __int_type operator++(int) volatile noexcept { return fetch_add(1); } __int_type operator--(int) noexcept { return fetch_sub(1); } __int_type operator--(int) volatile noexcept { return fetch_sub(1); } __int_type operator++() noexcept { return __atomic_add_fetch(&_M_i, 1, memory_order_seq_cst); } __int_type operator++() volatile noexcept { return __atomic_add_fetch(&_M_i, 1, memory_order_seq_cst); } __int_type operator--() noexcept { return __atomic_sub_fetch(&_M_i, 1, memory_order_seq_cst); } __int_type operator--() volatile noexcept { return __atomic_sub_fetch(&_M_i, 1, memory_order_seq_cst); } __int_type operator+=(__int_type __i) noexcept { return __atomic_add_fetch(&_M_i, __i, memory_order_seq_cst); } __int_type operator+=(__int_type __i) volatile noexcept { return __atomic_add_fetch(&_M_i, __i, memory_order_seq_cst); } __int_type operator-=(__int_type __i) noexcept { return __atomic_sub_fetch(&_M_i, __i, memory_order_seq_cst); } __int_type operator-=(__int_type __i) volatile noexcept { return __atomic_sub_fetch(&_M_i, __i, memory_order_seq_cst); } __int_type operator&=(__int_type __i) noexcept { return __atomic_and_fetch(&_M_i, __i, memory_order_seq_cst); } __int_type operator&=(__int_type __i) volatile noexcept { return __atomic_and_fetch(&_M_i, __i, memory_order_seq_cst); } __int_type operator\|=(__int_type __i) noexcept { return __atomic_or_fetch(&_M_i, __i, memory_order_seq_cst); } __int_type operator\|=(__int_type __i) volatile noexcept { return __atomic_or_fetch(&_M_i, __i, memory_order_seq_cst); } __int_type operator^=(__int_type __i) noexcept { return __atomic_xor_fetch(&_M_i, __i, memory_order_seq_cst); } __int_type operator^=(__int_type __i) volatile noexcept { return __atomic_xor_fetch(&_M_i, __i, memory_order_seq_cst); } bool is_lock_free() const noexcept { // Use a fake, minimally aligned pointer. return __atomic_is_lock_free(sizeof(_M_i), reinterpret_cast<void >(-__alignof(_M_i))); } bool is_lock_free() const volatile noexcept { // Use a fake, minimally aligned pointer. return __atomic_is_lock_free(sizeof(_M_i), reinterpret_cast<void >(-__alignof(_M_i))); } _GLIBCXX_ALWAYS_INLINE void store(__int_type __i, memory_order __m = memory_order_seq_cst) noexcept { memory_order __b = __m & __memory_order_mask; __glibcxx_assert(__b != memory_order_acquire); __glibcxx_assert(__b != memory_order_acq_rel); __glibcxx_assert(__b != memory_order_consume); __atomic_store_n(&_M_i, __i, __m); } _GLIBCXX_ALWAYS_INLINE void store(__int_type __i, memory_order __m = memory_order_seq_cst) volatile noexcept { memory_order __b = __m & __memory_order_mask; __glibcxx_assert(__b != memory_order_acquire); __glibcxx_assert(__b != memory_order_acq_rel); __glibcxx_assert(__b != memory_order_consume); __atomic_store_n(&_M_i, __i, __m); } _GLIBCXX_ALWAYS_INLINE __int_type load(memory_order __m = memory_order_seq_cst) const noexcept { memory_order __b = __m & __memory_order_mask; __glibcxx_assert(__b != memory_order_release); __glibcxx_assert(__b != memory_order_acq_rel); return __atomic_load_n(&_M_i, __m); } _GLIBCXX_ALWAYS_INLINE __int_type load(memory_order __m = memory_order_seq_cst) const volatile noexcept { memory_order __b = __m & __memory_order_mask; __glibcxx_assert(__b != memory_order_release); __glibcxx_assert(__b != memory_order_acq_rel); return __atomic_load_n(&_M_i, __m); } _GLIBCXX_ALWAYS_INLINE __int_type exchange(__int_type __i, memory_order __m = memory_order_seq_cst) noexcept { return __atomic_exchange_n(&_M_i, __i, __m); } _GLIBCXX_ALWAYS_INLINE __int_type exchange(__int_type __i, memory_order __m = memory_order_seq_cst) volatile noexcept { return __atomic_exchange_n(&_M_i, __i, __m); } _GLIBCXX_ALWAYS_INLINE bool compare_exchange_weak(__int_type& __i1, __int_type __i2, memory_order __m1, memory_order __m2) noexcept { memory_order __b2 = __m2 & __memory_order_mask; memory_order __b1 = __m1 & __memory_order_mask; __glibcxx_assert(__b2 != memory_order_release); __glibcxx_assert(__b2 != memory_order_acq_rel); __glibcxx_assert(__b2 <= __b1); return __atomic_compare_exchange_n(&_M_i, &__i1, __i2, 1, __m1, __m2); } _GLIBCXX_ALWAYS_INLINE bool compare_exchange_weak(__int_type& __i1, __int_type __i2, memory_order __m1, memory_order __m2) volatile noexcept { memory_order __b2 = __m2 & __memory_order_mask; memory_order __b1 = __m1 & __memory_order_mask; __glibcxx_assert(__b2 != memory_order_release); __glibcxx_assert(__b2 != memory_order_acq_rel); __glibcxx_assert(__b2 <= __b1); return __atomic_compare_exchange_n(&_M_i, &__i1, __i2, 1, __m1, __m2); } _GLIBCXX_ALWAYS_INLINE bool compare_exchange_weak(__int_type& __i1, __int_type __i2, memory_order __m = memory_order_seq_cst) noexcept { return compare_exchange_weak(__i1, __i2, __m, __cmpexch_failure_order(__m)); } _GLIBCXX_ALWAYS_INLINE bool compare_exchange_weak(__int_type& __i1, __int_type __i2, memory_order __m = memory_order_seq_cst) volatile noexcept { return compare_exchange_weak(__i1, __i2, __m, __cmpexch_failure_order(__m)); } _GLIBCXX_ALWAYS_INLINE bool compare_exchange_strong(__int_type& __i1, __int_type __i2, memory_order __m1, memory_order __m2) noexcept { memory_order __b2 = __m2 & __memory_order_mask; memory_order __b1 = __m1 & __memory_order_mask; __glibcxx_assert(__b2 != memory_order_release); __glibcxx_assert(__b2 != memory_order_acq_rel); __glibcxx_assert(__b2 <= __b1); return __atomic_compare_exchange_n(&_M_i, &__i1, __i2, 0, __m1, __m2); } _GLIBCXX_ALWAYS_INLINE bool compare_exchange_strong(__int_type& __i1, __int_type __i2, memory_order __m1, memory_order __m2) volatile noexcept { memory_order __b2 = __m2 & __memory_order_mask; memory_order __b1 = __m1 & __memory_order_mask; __glibcxx_assert(__b2 != memory_order_release); __glibcxx_assert(__b2 != memory_order_acq_rel); __glibcxx_assert(__b2 <= __b1); return __atomic_compare_exchange_n(&_M_i, &__i1, __i2, 0, __m1, __m2); } _GLIBCXX_ALWAYS_INLINE bool compare_exchange_strong(__int_type& __i1, __int_type __i2, memory_order __m = memory_order_seq_cst) noexcept { return compare_exchange_strong(__i1, __i2, __m, __cmpexch_failure_order(__m)); } _GLIBCXX_ALWAYS_INLINE bool compare_exchange_strong(__int_type& __i1, __int_type __i2, memory_order __m = memory_order_seq_cst) volatile noexcept { return compare_exchange_strong(__i1, __i2, __m, __cmpexch_failure_order(__m)); } _GLIBCXX_ALWAYS_INLINE __int_type fetch_add(__int_type __i, memory_order __m = memory_order_seq_cst) noexcept { return __atomic_fetch_add(&_M_i, __i, __m); } _GLIBCXX_ALWAYS_INLINE __int_type fetch_add(__int_type __i, memory_order __m = memory_order_seq_cst) volatile noexcept { return __atomic_fetch_add(&_M_i, __i, __m); } _GLIBCXX_ALWAYS_INLINE __int_type fetch_sub(__int_type __i, memory_order __m = memory_order_seq_cst) noexcept { return __atomic_fetch_sub(&_M_i, __i, __m); } _GLIBCXX_ALWAYS_INLINE __int_type fetch_sub(__int_type __i, memory_order __m = memory_order_seq_cst) volatile noexcept { return __atomic_fetch_sub(&_M_i, __i, __m); } _GLIBCXX_ALWAYS_INLINE __int_type fetch_and(__int_type __i, memory_order __m = memory_order_seq_cst) noexcept { return __atomic_fetch_and(&_M_i, __i, __m); } _GLIBCXX_ALWAYS_INLINE __int_type fetch_and(__int_type __i, memory_order __m = memory_order_seq_cst) volatile noexcept { return __atomic_fetch_and(&_M_i, __i, __m); } _GLIBCXX_ALWAYS_INLINE __int_type fetch_or(__int_type __i, memory_order __m = memory_order_seq_cst) noexcept { return __atomic_fetch_or(&_M_i, __i, __m); } _GLIBCXX_ALWAYS_INLINE __int_type fetch_or(__int_type __i, memory_order __m = memory_order_seq_cst) volatile noexcept { return __atomic_fetch_or(&_M_i, __i, __m); } _GLIBCXX_ALWAYS_INLINE __int_type fetch_xor(__int_type __i, memory_order __m = memory_order_seq_cst) noexcept { return __atomic_fetch_xor(&_M_i, __i, __m); } _GLIBCXX_ALWAYS_INLINE __int_type fetch_xor(__int_type __i, memory_order __m = memory_order_seq_cst) volatile noexcept { return __atomic_fetch_xor(&_M_i, __i, __m); } }; /// Partial specialization for pointer types. template<typename _PTp> struct __atomic_base<_PTp> { private: typedef _PTp* __pointer_type; __pointer_type _M_p; // Factored out to facilitate explicit specialization. constexpr ptrdiff_t _M_type_size(ptrdiff_t __d) const { return __d * sizeof(_PTp); } constexpr ptrdiff_t _M_type_size(ptrdiff_t __d) const volatile { return __d * sizeof(_PTp); } public: __atomic_base() noexcept = default; ~__atomic_base() noexcept = default; __atomic_base(const __atomic_base&) = delete; __atomic_base& operator=(const __atomic_base&) = delete; __atomic_base& operator=(const __atomic_base&) volatile = delete; // Requires __pointer_type convertible to _M_p. constexpr __atomic_base(__pointer_type __p) noexcept : _M_p (__p) { } operator __pointer_type() const noexcept { return load(); } operator __pointer_type() const volatile noexcept { return load(); } __pointer_type operator=(__pointer_type __p) noexcept { store(__p); return __p; } __pointer_type operator=(__pointer_type __p) volatile noexcept { store(__p); return __p; } __pointer_type operator++(int) noexcept { return fetch_add(1); } __pointer_type operator++(int) volatile noexcept { return fetch_add(1); } __pointer_type operator--(int) noexcept { return fetch_sub(1); } __pointer_type operator--(int) volatile noexcept { return fetch_sub(1); } __pointer_type operator++() noexcept { return __atomic_add_fetch(&_M_p, _M_type_size(1), memory_order_seq_cst); } __pointer_type operator++() volatile noexcept { return __atomic_add_fetch(&_M_p, _M_type_size(1), memory_order_seq_cst); } __pointer_type operator--() noexcept { return __atomic_sub_fetch(&_M_p, _M_type_size(1), memory_order_seq_cst); } __pointer_type operator--() volatile noexcept { return __atomic_sub_fetch(&_M_p, _M_type_size(1), memory_order_seq_cst); } __pointer_type operator+=(ptrdiff_t __d) noexcept { return __atomic_add_fetch(&_M_p, _M_type_size(__d), memory_order_seq_cst); } __pointer_type operator+=(ptrdiff_t __d) volatile noexcept { return __atomic_add_fetch(&_M_p, _M_type_size(__d), memory_order_seq_cst); } __pointer_type operator-=(ptrdiff_t __d) noexcept { return __atomic_sub_fetch(&_M_p, _M_type_size(__d), memory_order_seq_cst); } __pointer_type operator-=(ptrdiff_t __d) volatile noexcept { return __atomic_sub_fetch(&_M_p, _M_type_size(__d), memory_order_seq_cst); } bool is_lock_free() const noexcept { // Produce a fake, minimally aligned pointer. return __atomic_is_lock_free(sizeof(_M_p), reinterpret_cast<void >(-__alignof(_M_p))); } bool is_lock_free() const volatile noexcept { // Produce a fake, minimally aligned pointer. return __atomic_is_lock_free(sizeof(_M_p), reinterpret_cast<void >(-__alignof(_M_p))); } _GLIBCXX_ALWAYS_INLINE void store(__pointer_type __p, memory_order __m = memory_order_seq_cst) noexcept { memory_order __b = __m & __memory_order_mask; __glibcxx_assert(__b != memory_order_acquire); __glibcxx_assert(__b != memory_order_acq_rel); __glibcxx_assert(__b != memory_order_consume); __atomic_store_n(&_M_p, __p, __m); } _GLIBCXX_ALWAYS_INLINE void store(__pointer_type __p, memory_order __m = memory_order_seq_cst) volatile noexcept { memory_order __b = __m & __memory_order_mask; __glibcxx_assert(__b != memory_order_acquire); __glibcxx_assert(__b != memory_order_acq_rel); __glibcxx_assert(__b != memory_order_consume); __atomic_store_n(&_M_p, __p, __m); } _GLIBCXX_ALWAYS_INLINE __pointer_type load(memory_order __m = memory_order_seq_cst) const noexcept { memory_order __b = __m & __memory_order_mask; __glibcxx_assert(__b != memory_order_release); __glibcxx_assert(__b != memory_order_acq_rel); return __atomic_load_n(&_M_p, __m); } _GLIBCXX_ALWAYS_INLINE __pointer_type load(memory_order __m = memory_order_seq_cst) const volatile noexcept { memory_order __b = __m & __memory_order_mask; __glibcxx_assert(__b != memory_order_release); __glibcxx_assert(__b != memory_order_acq_rel); return __atomic_load_n(&_M_p, __m); } _GLIBCXX_ALWAYS_INLINE __pointer_type exchange(__pointer_type __p, memory_order __m = memory_order_seq_cst) noexcept { return __atomic_exchange_n(&_M_p, __p, __m); } _GLIBCXX_ALWAYS_INLINE __pointer_type exchange(__pointer_type __p, memory_order __m = memory_order_seq_cst) volatile noexcept { return __atomic_exchange_n(&_M_p, __p, __m); } _GLIBCXX_ALWAYS_INLINE bool compare_exchange_strong(__pointer_type& __p1, __pointer_type __p2, memory_order __m1, memory_order __m2) noexcept { memory_order __b2 = __m2 & __memory_order_mask; memory_order __b1 = __m1 & __memory_order_mask; __glibcxx_assert(__b2 != memory_order_release); __glibcxx_assert(__b2 != memory_order_acq_rel); __glibcxx_assert(__b2 <= __b1); return __atomic_compare_exchange_n(&_M_p, &__p1, __p2, 0, __m1, __m2); } _GLIBCXX_ALWAYS_INLINE bool compare_exchange_strong(__pointer_type& __p1, __pointer_type __p2, memory_order __m1, memory_order __m2) volatile noexcept { memory_order __b2 = __m2 & __memory_order_mask; memory_order __b1 = __m1 & __memory_order_mask; __glibcxx_assert(__b2 != memory_order_release); __glibcxx_assert(__b2 != memory_order_acq_rel); __glibcxx_assert(__b2 <= __b1); return __atomic_compare_exchange_n(&_M_p, &__p1, __p2, 0, __m1, __m2); } _GLIBCXX_ALWAYS_INLINE __pointer_type fetch_add(ptrdiff_t __d, memory_order __m = memory_order_seq_cst) noexcept { return __atomic_fetch_add(&_M_p, _M_type_size(__d), __m); } _GLIBCXX_ALWAYS_INLINE __pointer_type fetch_add(ptrdiff_t __d, memory_order __m = memory_order_seq_cst) volatile noexcept { return __atomic_fetch_add(&_M_p, _M_type_size(__d), __m); } _GLIBCXX_ALWAYS_INLINE __pointer_type fetch_sub(ptrdiff_t __d, memory_order __m = memory_order_seq_cst) noexcept { return __atomic_fetch_sub(&_M_p, _M_type_size(__d), __m); } _GLIBCXX_ALWAYS_INLINE __pointer_type fetch_sub(ptrdiff_t __d, memory_order __m = memory_order_seq_cst) volatile noexcept { return __atomic_fetch_sub(&_M_p, _M_type_size(__d), __m); } }; // @} group atomics _GLIBCXX_END_NAMESPACE_VERSION } // namespace std #endif Back

Edit File : atomic_base.h | Size : 23.28 KB

// -*- C++ -*- header.

// Copyright (C) 2008-2018 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 bits/atomic_base.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{atomic}
 */

#ifndef _GLIBCXX_ATOMIC_BASE_H
#define _GLIBCXX_ATOMIC_BASE_H 1

#pragma GCC system_header

#include <bits/c++config.h>
#include <stdint.h>
#include <bits/atomic_lockfree_defines.h>

#ifndef _GLIBCXX_ALWAYS_INLINE
#define _GLIBCXX_ALWAYS_INLINE inline __attribute__((__always_inline__))
#endif

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

/**
   * @defgroup atomics Atomics
   *
   * Components for performing atomic operations.
   * @{
   */

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

enum __memory_order_modifier
    {
      __memory_order_mask          = 0x0ffff,
      __memory_order_modifier_mask = 0xffff0000,
      __memory_order_hle_acquire   = 0x10000,
      __memory_order_hle_release   = 0x20000
    };

constexpr memory_order
  operator|(memory_order __m, __memory_order_modifier __mod)
  {
    return memory_order(__m | int(__mod));
  }

constexpr memory_order
  operator&(memory_order __m, __memory_order_modifier __mod)
  {
    return memory_order(__m & int(__mod));
  }

// Drop release ordering as per [atomics.types.operations.req]/21
  constexpr memory_order
  __cmpexch_failure_order2(memory_order __m) noexcept
  {
    return __m == memory_order_acq_rel ? memory_order_acquire
      : __m == memory_order_release ? memory_order_relaxed : __m;
  }

constexpr memory_order
  __cmpexch_failure_order(memory_order __m) noexcept
  {
    return memory_order(__cmpexch_failure_order2(__m & __memory_order_mask)
      | (__m & __memory_order_modifier_mask));
  }

_GLIBCXX_ALWAYS_INLINE void
  atomic_thread_fence(memory_order __m) noexcept
  { __atomic_thread_fence(__m); }

_GLIBCXX_ALWAYS_INLINE void
  atomic_signal_fence(memory_order __m) noexcept
  { __atomic_signal_fence(__m); }

/// kill_dependency
  template<typename _Tp>
    inline _Tp
    kill_dependency(_Tp __y) noexcept
    {
      _Tp __ret(__y);
      return __ret;
    }

// Base types for atomics.
  template<typename _IntTp>
    struct __atomic_base;

#define ATOMIC_VAR_INIT(_VI) { _VI }

template<typename _Tp>
    struct atomic;

template<typename _Tp>
    struct atomic<_Tp*>;

/* The target's "set" value for test-and-set may not be exactly 1.  */
#if __GCC_ATOMIC_TEST_AND_SET_TRUEVAL == 1
    typedef bool __atomic_flag_data_type;
#else
    typedef unsigned char __atomic_flag_data_type;
#endif

/**
   *  @brief Base type for atomic_flag.
   *
   *  Base type is POD with data, allowing atomic_flag to derive from
   *  it and meet the standard layout type requirement. In addition to
   *  compatibility with a C interface, this allows different
   *  implementations of atomic_flag to use the same atomic operation
   *  functions, via a standard conversion to the __atomic_flag_base
   *  argument.
  */
  _GLIBCXX_BEGIN_EXTERN_C

struct __atomic_flag_base
  {
    __atomic_flag_data_type _M_i;
  };

_GLIBCXX_END_EXTERN_C

#define ATOMIC_FLAG_INIT { 0 }

/// atomic_flag
  struct atomic_flag : public __atomic_flag_base
  {
    atomic_flag() noexcept = default;
    ~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;

// Conversion to ATOMIC_FLAG_INIT.
    constexpr atomic_flag(bool __i) noexcept
      : __atomic_flag_base{ _S_init(__i) }
    { }

_GLIBCXX_ALWAYS_INLINE bool
    test_and_set(memory_order __m = memory_order_seq_cst) noexcept
    {
      return __atomic_test_and_set (&_M_i, __m);
    }

_GLIBCXX_ALWAYS_INLINE bool
    test_and_set(memory_order __m = memory_order_seq_cst) volatile noexcept
    {
      return __atomic_test_and_set (&_M_i, __m);
    }

_GLIBCXX_ALWAYS_INLINE void
    clear(memory_order __m = memory_order_seq_cst) noexcept
    {
      memory_order __b = __m & __memory_order_mask;
      __glibcxx_assert(__b != memory_order_consume);
      __glibcxx_assert(__b != memory_order_acquire);
      __glibcxx_assert(__b != memory_order_acq_rel);

__atomic_clear (&_M_i, __m);
    }

_GLIBCXX_ALWAYS_INLINE void
    clear(memory_order __m = memory_order_seq_cst) volatile noexcept
    {
      memory_order __b = __m & __memory_order_mask;
      __glibcxx_assert(__b != memory_order_consume);
      __glibcxx_assert(__b != memory_order_acquire);
      __glibcxx_assert(__b != memory_order_acq_rel);

__atomic_clear (&_M_i, __m);
    }

private:
    static constexpr __atomic_flag_data_type
    _S_init(bool __i)
    { return __i ? __GCC_ATOMIC_TEST_AND_SET_TRUEVAL : 0; }
  };

/// Base class for atomic integrals.
  //
  // For each of the integral types, define atomic_[integral type] struct
  //
  // atomic_bool     bool
  // atomic_char     char
  // atomic_schar    signed char
  // atomic_uchar    unsigned char
  // atomic_short    short
  // atomic_ushort   unsigned short
  // atomic_int      int
  // atomic_uint     unsigned int
  // atomic_long     long
  // atomic_ulong    unsigned long
  // atomic_llong    long long
  // atomic_ullong   unsigned long long
  // atomic_char16_t char16_t
  // atomic_char32_t char32_t
  // atomic_wchar_t  wchar_t
  //
  // NB: Assuming _ITp is an integral scalar type that is 1, 2, 4, or
  // 8 bytes, since that is what GCC built-in functions for atomic
  // memory access expect.
  template<typename _ITp>
    struct __atomic_base
    {
    private:
      typedef _ITp 	__int_type;

static constexpr int _S_alignment =
	sizeof(_ITp) > alignof(_ITp) ? sizeof(_ITp) : alignof(_ITp);

alignas(_S_alignment) __int_type _M_i;

public:
      __atomic_base() noexcept = default;
      ~__atomic_base() noexcept = default;
      __atomic_base(const __atomic_base&) = delete;
      __atomic_base& operator=(const __atomic_base&) = delete;
      __atomic_base& operator=(const __atomic_base&) volatile = delete;

// Requires __int_type convertible to _M_i.
      constexpr __atomic_base(__int_type __i) noexcept : _M_i (__i) { }

operator __int_type() const noexcept
      { return load(); }

operator __int_type() const volatile noexcept
      { return load(); }

__int_type
      operator=(__int_type __i) noexcept
      {
	store(__i);
	return __i;
      }

__int_type
      operator=(__int_type __i) volatile noexcept
      {
	store(__i);
	return __i;
      }

__int_type
      operator++(int) noexcept
      { return fetch_add(1); }

__int_type
      operator++(int) volatile noexcept
      { return fetch_add(1); }

__int_type
      operator--(int) noexcept
      { return fetch_sub(1); }

__int_type
      operator--(int) volatile noexcept
      { return fetch_sub(1); }

__int_type
      operator++() noexcept
      { return __atomic_add_fetch(&_M_i, 1, memory_order_seq_cst); }

__int_type
      operator++() volatile noexcept
      { return __atomic_add_fetch(&_M_i, 1, memory_order_seq_cst); }

__int_type
      operator--() noexcept
      { return __atomic_sub_fetch(&_M_i, 1, memory_order_seq_cst); }

__int_type
      operator--() volatile noexcept
      { return __atomic_sub_fetch(&_M_i, 1, memory_order_seq_cst); }

__int_type
      operator+=(__int_type __i) noexcept
      { return __atomic_add_fetch(&_M_i, __i, memory_order_seq_cst); }

__int_type
      operator+=(__int_type __i) volatile noexcept
      { return __atomic_add_fetch(&_M_i, __i, memory_order_seq_cst); }

__int_type
      operator-=(__int_type __i) noexcept
      { return __atomic_sub_fetch(&_M_i, __i, memory_order_seq_cst); }

__int_type
      operator-=(__int_type __i) volatile noexcept
      { return __atomic_sub_fetch(&_M_i, __i, memory_order_seq_cst); }

__int_type
      operator&=(__int_type __i) noexcept
      { return __atomic_and_fetch(&_M_i, __i, memory_order_seq_cst); }

__int_type
      operator&=(__int_type __i) volatile noexcept
      { return __atomic_and_fetch(&_M_i, __i, memory_order_seq_cst); }

__int_type
      operator|=(__int_type __i) noexcept
      { return __atomic_or_fetch(&_M_i, __i, memory_order_seq_cst); }

__int_type
      operator|=(__int_type __i) volatile noexcept
      { return __atomic_or_fetch(&_M_i, __i, memory_order_seq_cst); }

__int_type
      operator^=(__int_type __i) noexcept
      { return __atomic_xor_fetch(&_M_i, __i, memory_order_seq_cst); }

__int_type
      operator^=(__int_type __i) volatile noexcept
      { return __atomic_xor_fetch(&_M_i, __i, memory_order_seq_cst); }

bool
      is_lock_free() const noexcept
      {
	// Use a fake, minimally aligned pointer.
	return __atomic_is_lock_free(sizeof(_M_i),
	    reinterpret_cast<void *>(-__alignof(_M_i)));
      }

bool
      is_lock_free() const volatile noexcept
      {
	// Use a fake, minimally aligned pointer.
	return __atomic_is_lock_free(sizeof(_M_i),
	    reinterpret_cast<void *>(-__alignof(_M_i)));
      }

_GLIBCXX_ALWAYS_INLINE void
      store(__int_type __i, memory_order __m = memory_order_seq_cst) noexcept
      {
	memory_order __b = __m & __memory_order_mask;
	__glibcxx_assert(__b != memory_order_acquire);
	__glibcxx_assert(__b != memory_order_acq_rel);
	__glibcxx_assert(__b != memory_order_consume);

__atomic_store_n(&_M_i, __i, __m);
      }

_GLIBCXX_ALWAYS_INLINE void
      store(__int_type __i,
	    memory_order __m = memory_order_seq_cst) volatile noexcept
      {
	memory_order __b = __m & __memory_order_mask;
	__glibcxx_assert(__b != memory_order_acquire);
	__glibcxx_assert(__b != memory_order_acq_rel);
	__glibcxx_assert(__b != memory_order_consume);

__atomic_store_n(&_M_i, __i, __m);
      }

_GLIBCXX_ALWAYS_INLINE __int_type
      load(memory_order __m = memory_order_seq_cst) const noexcept
      {
	memory_order __b = __m & __memory_order_mask;
	__glibcxx_assert(__b != memory_order_release);
	__glibcxx_assert(__b != memory_order_acq_rel);

return __atomic_load_n(&_M_i, __m);
      }

_GLIBCXX_ALWAYS_INLINE __int_type
      load(memory_order __m = memory_order_seq_cst) const volatile noexcept
      {
	memory_order __b = __m & __memory_order_mask;
	__glibcxx_assert(__b != memory_order_release);
	__glibcxx_assert(__b != memory_order_acq_rel);

return __atomic_load_n(&_M_i, __m);
      }

_GLIBCXX_ALWAYS_INLINE __int_type
      exchange(__int_type __i,
	       memory_order __m = memory_order_seq_cst) noexcept
      {
	return __atomic_exchange_n(&_M_i, __i, __m);
      }

_GLIBCXX_ALWAYS_INLINE __int_type
      exchange(__int_type __i,
	       memory_order __m = memory_order_seq_cst) volatile noexcept
      {
	return __atomic_exchange_n(&_M_i, __i, __m);
      }

_GLIBCXX_ALWAYS_INLINE bool
      compare_exchange_weak(__int_type& __i1, __int_type __i2,
			    memory_order __m1, memory_order __m2) noexcept
      {
	memory_order __b2 = __m2 & __memory_order_mask;
	memory_order __b1 = __m1 & __memory_order_mask;
	__glibcxx_assert(__b2 != memory_order_release);
	__glibcxx_assert(__b2 != memory_order_acq_rel);
	__glibcxx_assert(__b2 <= __b1);

return __atomic_compare_exchange_n(&_M_i, &__i1, __i2, 1, __m1, __m2);
      }

_GLIBCXX_ALWAYS_INLINE bool
      compare_exchange_weak(__int_type& __i1, __int_type __i2,
			    memory_order __m1,
			    memory_order __m2) volatile noexcept
      {
	memory_order __b2 = __m2 & __memory_order_mask;
	memory_order __b1 = __m1 & __memory_order_mask;
	__glibcxx_assert(__b2 != memory_order_release);
	__glibcxx_assert(__b2 != memory_order_acq_rel);
	__glibcxx_assert(__b2 <= __b1);

return __atomic_compare_exchange_n(&_M_i, &__i1, __i2, 1, __m1, __m2);
      }

_GLIBCXX_ALWAYS_INLINE bool
      compare_exchange_weak(__int_type& __i1, __int_type __i2,
			    memory_order __m = memory_order_seq_cst) noexcept
      {
	return compare_exchange_weak(__i1, __i2, __m,
				     __cmpexch_failure_order(__m));
      }

_GLIBCXX_ALWAYS_INLINE bool
      compare_exchange_weak(__int_type& __i1, __int_type __i2,
		   memory_order __m = memory_order_seq_cst) volatile noexcept
      {
	return compare_exchange_weak(__i1, __i2, __m,
				     __cmpexch_failure_order(__m));
      }

_GLIBCXX_ALWAYS_INLINE bool
      compare_exchange_strong(__int_type& __i1, __int_type __i2,
			      memory_order __m1, memory_order __m2) noexcept
      {
	memory_order __b2 = __m2 & __memory_order_mask;
	memory_order __b1 = __m1 & __memory_order_mask;
	__glibcxx_assert(__b2 != memory_order_release);
	__glibcxx_assert(__b2 != memory_order_acq_rel);
	__glibcxx_assert(__b2 <= __b1);

return __atomic_compare_exchange_n(&_M_i, &__i1, __i2, 0, __m1, __m2);
      }

_GLIBCXX_ALWAYS_INLINE bool
      compare_exchange_strong(__int_type& __i1, __int_type __i2,
			      memory_order __m1,
			      memory_order __m2) volatile noexcept
      {
	memory_order __b2 = __m2 & __memory_order_mask;
	memory_order __b1 = __m1 & __memory_order_mask;

__glibcxx_assert(__b2 != memory_order_release);
	__glibcxx_assert(__b2 != memory_order_acq_rel);
	__glibcxx_assert(__b2 <= __b1);

return __atomic_compare_exchange_n(&_M_i, &__i1, __i2, 0, __m1, __m2);
      }

_GLIBCXX_ALWAYS_INLINE bool
      compare_exchange_strong(__int_type& __i1, __int_type __i2,
			      memory_order __m = memory_order_seq_cst) noexcept
      {
	return compare_exchange_strong(__i1, __i2, __m,
				       __cmpexch_failure_order(__m));
      }

_GLIBCXX_ALWAYS_INLINE bool
      compare_exchange_strong(__int_type& __i1, __int_type __i2,
		 memory_order __m = memory_order_seq_cst) volatile noexcept
      {
	return compare_exchange_strong(__i1, __i2, __m,
				       __cmpexch_failure_order(__m));
      }

_GLIBCXX_ALWAYS_INLINE __int_type
      fetch_add(__int_type __i,
		memory_order __m = memory_order_seq_cst) noexcept
      { return __atomic_fetch_add(&_M_i, __i, __m); }

_GLIBCXX_ALWAYS_INLINE __int_type
      fetch_add(__int_type __i,
		memory_order __m = memory_order_seq_cst) volatile noexcept
      { return __atomic_fetch_add(&_M_i, __i, __m); }

_GLIBCXX_ALWAYS_INLINE __int_type
      fetch_sub(__int_type __i,
		memory_order __m = memory_order_seq_cst) noexcept
      { return __atomic_fetch_sub(&_M_i, __i, __m); }

_GLIBCXX_ALWAYS_INLINE __int_type
      fetch_sub(__int_type __i,
		memory_order __m = memory_order_seq_cst) volatile noexcept
      { return __atomic_fetch_sub(&_M_i, __i, __m); }

_GLIBCXX_ALWAYS_INLINE __int_type
      fetch_and(__int_type __i,
		memory_order __m = memory_order_seq_cst) noexcept
      { return __atomic_fetch_and(&_M_i, __i, __m); }

_GLIBCXX_ALWAYS_INLINE __int_type
      fetch_and(__int_type __i,
		memory_order __m = memory_order_seq_cst) volatile noexcept
      { return __atomic_fetch_and(&_M_i, __i, __m); }

_GLIBCXX_ALWAYS_INLINE __int_type
      fetch_or(__int_type __i,
	       memory_order __m = memory_order_seq_cst) noexcept
      { return __atomic_fetch_or(&_M_i, __i, __m); }

_GLIBCXX_ALWAYS_INLINE __int_type
      fetch_or(__int_type __i,
	       memory_order __m = memory_order_seq_cst) volatile noexcept
      { return __atomic_fetch_or(&_M_i, __i, __m); }

_GLIBCXX_ALWAYS_INLINE __int_type
      fetch_xor(__int_type __i,
		memory_order __m = memory_order_seq_cst) noexcept
      { return __atomic_fetch_xor(&_M_i, __i, __m); }

_GLIBCXX_ALWAYS_INLINE __int_type
      fetch_xor(__int_type __i,
		memory_order __m = memory_order_seq_cst) volatile noexcept
      { return __atomic_fetch_xor(&_M_i, __i, __m); }
    };

/// Partial specialization for pointer types.
  template<typename _PTp>
    struct __atomic_base<_PTp*>
    {
    private:
      typedef _PTp* 	__pointer_type;

__pointer_type 	_M_p;

// Factored out to facilitate explicit specialization.
      constexpr ptrdiff_t
      _M_type_size(ptrdiff_t __d) const { return __d * sizeof(_PTp); }

constexpr ptrdiff_t
      _M_type_size(ptrdiff_t __d) const volatile { return __d * sizeof(_PTp); }

// Requires __pointer_type convertible to _M_p.
      constexpr __atomic_base(__pointer_type __p) noexcept : _M_p (__p) { }

operator __pointer_type() const noexcept
      { return load(); }

operator __pointer_type() const volatile noexcept
      { return load(); }

__pointer_type
      operator=(__pointer_type __p) noexcept
      {
	store(__p);
	return __p;
      }

__pointer_type
      operator=(__pointer_type __p) volatile noexcept
      {
	store(__p);
	return __p;
      }

__pointer_type
      operator++(int) noexcept
      { return fetch_add(1); }

__pointer_type
      operator++(int) volatile noexcept
      { return fetch_add(1); }

__pointer_type
      operator--(int) noexcept
      { return fetch_sub(1); }

__pointer_type
      operator--(int) volatile noexcept
      { return fetch_sub(1); }

__pointer_type
      operator++() noexcept
      { return __atomic_add_fetch(&_M_p, _M_type_size(1),
				  memory_order_seq_cst); }

__pointer_type
      operator++() volatile noexcept
      { return __atomic_add_fetch(&_M_p, _M_type_size(1),
				  memory_order_seq_cst); }

__pointer_type
      operator--() noexcept
      { return __atomic_sub_fetch(&_M_p, _M_type_size(1),
				  memory_order_seq_cst); }

__pointer_type
      operator--() volatile noexcept
      { return __atomic_sub_fetch(&_M_p, _M_type_size(1),
				  memory_order_seq_cst); }

__pointer_type
      operator+=(ptrdiff_t __d) noexcept
      { return __atomic_add_fetch(&_M_p, _M_type_size(__d),
				  memory_order_seq_cst); }

__pointer_type
      operator+=(ptrdiff_t __d) volatile noexcept
      { return __atomic_add_fetch(&_M_p, _M_type_size(__d),
				  memory_order_seq_cst); }

__pointer_type
      operator-=(ptrdiff_t __d) noexcept
      { return __atomic_sub_fetch(&_M_p, _M_type_size(__d),
				  memory_order_seq_cst); }

__pointer_type
      operator-=(ptrdiff_t __d) volatile noexcept
      { return __atomic_sub_fetch(&_M_p, _M_type_size(__d),
				  memory_order_seq_cst); }

bool
      is_lock_free() const noexcept
      {
	// Produce a fake, minimally aligned pointer.
	return __atomic_is_lock_free(sizeof(_M_p),
	    reinterpret_cast<void *>(-__alignof(_M_p)));
      }

bool
      is_lock_free() const volatile noexcept
      {
	// Produce a fake, minimally aligned pointer.
	return __atomic_is_lock_free(sizeof(_M_p),
	    reinterpret_cast<void *>(-__alignof(_M_p)));
      }

_GLIBCXX_ALWAYS_INLINE void
      store(__pointer_type __p,
	    memory_order __m = memory_order_seq_cst) noexcept
      {
        memory_order __b = __m & __memory_order_mask;

__glibcxx_assert(__b != memory_order_acquire);
	__glibcxx_assert(__b != memory_order_acq_rel);
	__glibcxx_assert(__b != memory_order_consume);

__atomic_store_n(&_M_p, __p, __m);
      }

_GLIBCXX_ALWAYS_INLINE void
      store(__pointer_type __p,
	    memory_order __m = memory_order_seq_cst) volatile noexcept
      {
	memory_order __b = __m & __memory_order_mask;
	__glibcxx_assert(__b != memory_order_acquire);
	__glibcxx_assert(__b != memory_order_acq_rel);
	__glibcxx_assert(__b != memory_order_consume);

__atomic_store_n(&_M_p, __p, __m);
      }

_GLIBCXX_ALWAYS_INLINE __pointer_type
      load(memory_order __m = memory_order_seq_cst) const noexcept
      {
	memory_order __b = __m & __memory_order_mask;
	__glibcxx_assert(__b != memory_order_release);
	__glibcxx_assert(__b != memory_order_acq_rel);

return __atomic_load_n(&_M_p, __m);
      }

_GLIBCXX_ALWAYS_INLINE __pointer_type
      load(memory_order __m = memory_order_seq_cst) const volatile noexcept
      {
	memory_order __b = __m & __memory_order_mask;
	__glibcxx_assert(__b != memory_order_release);
	__glibcxx_assert(__b != memory_order_acq_rel);

return __atomic_load_n(&_M_p, __m);
      }

_GLIBCXX_ALWAYS_INLINE __pointer_type
      exchange(__pointer_type __p,
	       memory_order __m = memory_order_seq_cst) noexcept
      {
	return __atomic_exchange_n(&_M_p, __p, __m);
      }

_GLIBCXX_ALWAYS_INLINE __pointer_type
      exchange(__pointer_type __p,
	       memory_order __m = memory_order_seq_cst) volatile noexcept
      {
	return __atomic_exchange_n(&_M_p, __p, __m);
      }

_GLIBCXX_ALWAYS_INLINE bool
      compare_exchange_strong(__pointer_type& __p1, __pointer_type __p2,
			      memory_order __m1,
			      memory_order __m2) noexcept
      {
	memory_order __b2 = __m2 & __memory_order_mask;
	memory_order __b1 = __m1 & __memory_order_mask;
	__glibcxx_assert(__b2 != memory_order_release);
	__glibcxx_assert(__b2 != memory_order_acq_rel);
	__glibcxx_assert(__b2 <= __b1);

return __atomic_compare_exchange_n(&_M_p, &__p1, __p2, 0, __m1, __m2);
      }

_GLIBCXX_ALWAYS_INLINE bool
      compare_exchange_strong(__pointer_type& __p1, __pointer_type __p2,
			      memory_order __m1,
			      memory_order __m2) volatile noexcept
      {
	memory_order __b2 = __m2 & __memory_order_mask;
	memory_order __b1 = __m1 & __memory_order_mask;

__glibcxx_assert(__b2 != memory_order_release);
	__glibcxx_assert(__b2 != memory_order_acq_rel);
	__glibcxx_assert(__b2 <= __b1);

return __atomic_compare_exchange_n(&_M_p, &__p1, __p2, 0, __m1, __m2);
      }

_GLIBCXX_ALWAYS_INLINE __pointer_type
      fetch_add(ptrdiff_t __d,
		memory_order __m = memory_order_seq_cst) noexcept
      { return __atomic_fetch_add(&_M_p, _M_type_size(__d), __m); }

_GLIBCXX_ALWAYS_INLINE __pointer_type
      fetch_add(ptrdiff_t __d,
		memory_order __m = memory_order_seq_cst) volatile noexcept
      { return __atomic_fetch_add(&_M_p, _M_type_size(__d), __m); }

_GLIBCXX_ALWAYS_INLINE __pointer_type
      fetch_sub(ptrdiff_t __d,
		memory_order __m = memory_order_seq_cst) noexcept
      { return __atomic_fetch_sub(&_M_p, _M_type_size(__d), __m); }

_GLIBCXX_ALWAYS_INLINE __pointer_type
      fetch_sub(ptrdiff_t __d,
		memory_order __m = memory_order_seq_cst) volatile noexcept
      { return __atomic_fetch_sub(&_M_p, _M_type_size(__d), __m); }
    };

// @} group atomics

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std

#endif

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