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local_atomic
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// -*- C++ -*- header.
// Copyright (C) 2008-2014 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/>.
// ????????????????????????????????????????????????????????????????????
//
// This is a copy of the libstdc++ header, with the trivial modification
// of ignoring the c++config.h include. If and when the top-level build is
// fixed so that target libraries can be built using the newly built, we can
// delete this file.
//
// ????????????????????????????????????????????????????????????????????
/** @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
#undef __always_inline
#define __always_inline __attribute__((always_inline))
// #pragma GCC system_header
// #ifndef __GXX_EXPERIMENTAL_CXX0X__
// # include <bits/c++0x_warning.h>
// #endif
// #include <bits/atomic_base.h>
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;
inline __always_inline memory_order
__calculate_memory_order(memory_order __m) noexcept
{
const bool __cond1 = __m == memory_order_release;
const bool __cond2 = __m == memory_order_acq_rel;
memory_order __mo1(__cond1 ? memory_order_relaxed : __m);
memory_order __mo2(__cond2 ? memory_order_acquire : __mo1);
return __mo2;
}
inline __always_inline void
atomic_thread_fence(memory_order __m) noexcept
{
__atomic_thread_fence (__m);
}
inline __always_inline void
atomic_signal_fence(memory_order __m) noexcept
{
__atomic_thread_fence (__m);
}
/// kill_dependency
template<typename _Tp>
inline _Tp
kill_dependency(_Tp __y) noexcept
{
_Tp __ret(__y);
return __ret;
}
/// Lock-free Property
#define ATOMIC_BOOL_LOCK_FREE __GCC_ATOMIC_BOOL_LOCK_FREE
#define ATOMIC_CHAR_LOCK_FREE __GCC_ATOMIC_CHAR_LOCK_FREE
#define ATOMIC_WCHAR_T_LOCK_FREE __GCC_ATOMIC_WCHAR_T_LOCK_FREE
#define ATOMIC_CHAR16_T_LOCK_FREE __GCC_ATOMIC_CHAR16_T_LOCK_FREE
#define ATOMIC_CHAR32_T_LOCK_FREE __GCC_ATOMIC_CHAR32_T_LOCK_FREE
#define ATOMIC_SHORT_LOCK_FREE __GCC_ATOMIC_SHORT_LOCK_FREE
#define ATOMIC_INT_LOCK_FREE __GCC_ATOMIC_INT_LOCK_FREE
#define ATOMIC_LONG_LOCK_FREE __GCC_ATOMIC_LONG_LOCK_FREE
#define ATOMIC_LLONG_LOCK_FREE __GCC_ATOMIC_LLONG_LOCK_FREE
#define ATOMIC_POINTER_LOCK_FREE __GCC_ATOMIC_POINTER_LOCK_FREE
// Base types for atomics.
template<typename _IntTp>
struct __atomic_base;
/// atomic_char
typedef __atomic_base<char> atomic_char;
/// atomic_schar
typedef __atomic_base<signed char> atomic_schar;
/// atomic_uchar
typedef __atomic_base<unsigned char> atomic_uchar;
/// atomic_short
typedef __atomic_base<short> atomic_short;
/// atomic_ushort
typedef __atomic_base<unsigned short> atomic_ushort;
/// atomic_int
typedef __atomic_base<int> atomic_int;
/// atomic_uint
typedef __atomic_base<unsigned int> atomic_uint;
/// atomic_long
typedef __atomic_base<long> atomic_long;
/// atomic_ulong
typedef __atomic_base<unsigned long> atomic_ulong;
/// atomic_llong
typedef __atomic_base<long long> atomic_llong;
/// atomic_ullong
typedef __atomic_base<unsigned long long> atomic_ullong;
/// atomic_wchar_t
typedef __atomic_base<wchar_t> atomic_wchar_t;
/// atomic_char16_t
typedef __atomic_base<char16_t> atomic_char16_t;
/// atomic_char32_t
typedef __atomic_base<char32_t> atomic_char32_t;
/// atomic_char32_t
typedef __atomic_base<char32_t> atomic_char32_t;
/// atomic_int_least8_t
typedef __atomic_base<int_least8_t> atomic_int_least8_t;
/// atomic_uint_least8_t
typedef __atomic_base<uint_least8_t> atomic_uint_least8_t;
/// atomic_int_least16_t
typedef __atomic_base<int_least16_t> atomic_int_least16_t;
/// atomic_uint_least16_t
typedef __atomic_base<uint_least16_t> atomic_uint_least16_t;
/// atomic_int_least32_t
typedef __atomic_base<int_least32_t> atomic_int_least32_t;
/// atomic_uint_least32_t
typedef __atomic_base<uint_least32_t> atomic_uint_least32_t;
/// atomic_int_least64_t
typedef __atomic_base<int_least64_t> atomic_int_least64_t;
/// atomic_uint_least64_t
typedef __atomic_base<uint_least64_t> atomic_uint_least64_t;
/// atomic_int_fast8_t
typedef __atomic_base<int_fast8_t> atomic_int_fast8_t;
/// atomic_uint_fast8_t
typedef __atomic_base<uint_fast8_t> atomic_uint_fast8_t;
/// atomic_int_fast16_t
typedef __atomic_base<int_fast16_t> atomic_int_fast16_t;
/// atomic_uint_fast16_t
typedef __atomic_base<uint_fast16_t> atomic_uint_fast16_t;
/// atomic_int_fast32_t
typedef __atomic_base<int_fast32_t> atomic_int_fast32_t;
/// atomic_uint_fast32_t
typedef __atomic_base<uint_fast32_t> atomic_uint_fast32_t;
/// atomic_int_fast64_t
typedef __atomic_base<int_fast64_t> atomic_int_fast64_t;
/// atomic_uint_fast64_t
typedef __atomic_base<uint_fast64_t> atomic_uint_fast64_t;
/// atomic_intptr_t
typedef __atomic_base<intptr_t> atomic_intptr_t;
/// atomic_uintptr_t
typedef __atomic_base<uintptr_t> atomic_uintptr_t;
/// atomic_size_t
typedef __atomic_base<size_t> atomic_size_t;
/// atomic_intmax_t
typedef __atomic_base<intmax_t> atomic_intmax_t;
/// atomic_uintmax_t
typedef __atomic_base<uintmax_t> atomic_uintmax_t;
/// atomic_ptrdiff_t
typedef __atomic_base<ptrdiff_t> atomic_ptrdiff_t;
#define ATOMIC_VAR_INIT(_VI) { _VI }
template<typename _Tp>
struct atomic;
template<typename _Tp>
struct atomic<_Tp*>;
/**
* @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
* compatibilty 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
{
bool _M_i;
};
// _GLIBCXX_END_EXTERN_C
#define ATOMIC_FLAG_INIT { false }
/// 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.
atomic_flag(bool __i) noexcept : __atomic_flag_base({ __i }) { }
__always_inline bool
test_and_set(memory_order __m = memory_order_seq_cst) noexcept
{
return __atomic_test_and_set (&_M_i, __m);
}
__always_inline bool
test_and_set(memory_order __m = memory_order_seq_cst) volatile noexcept
{
return __atomic_test_and_set (&_M_i, __m);
}
__always_inline void
clear(memory_order __m = memory_order_seq_cst) noexcept
{
// __glibcxx_assert(__m != memory_order_consume);
// __glibcxx_assert(__m != memory_order_acquire);
// __glibcxx_assert(__m != memory_order_acq_rel);
__atomic_clear (&_M_i, __m);
}
__always_inline void
clear(memory_order __m = memory_order_seq_cst) volatile noexcept
{
// __glibcxx_assert(__m != memory_order_consume);
// __glibcxx_assert(__m != memory_order_acquire);
// __glibcxx_assert(__m != memory_order_acq_rel);
__atomic_clear (&_M_i, __m);
}
};
/// 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;
__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
{ return __atomic_is_lock_free (sizeof (_M_i), &_M_i); }
bool
is_lock_free() const volatile noexcept
{ return __atomic_is_lock_free (sizeof (_M_i), &_M_i); }
__always_inline void
store(__int_type __i, memory_order __m = memory_order_seq_cst) noexcept
{
// __glibcxx_assert(__m != memory_order_acquire);
// __glibcxx_assert(__m != memory_order_acq_rel);
// __glibcxx_assert(__m != memory_order_consume);
__atomic_store_n(&_M_i, __i, __m);
}
__always_inline void
store(__int_type __i,
memory_order __m = memory_order_seq_cst) volatile noexcept
{
// __glibcxx_assert(__m != memory_order_acquire);
// __glibcxx_assert(__m != memory_order_acq_rel);
// __glibcxx_assert(__m != memory_order_consume);
__atomic_store_n(&_M_i, __i, __m);
}
__always_inline __int_type
load(memory_order __m = memory_order_seq_cst) const noexcept
{
// __glibcxx_assert(__m != memory_order_release);
// __glibcxx_assert(__m != memory_order_acq_rel);
return __atomic_load_n(&_M_i, __m);
}
__always_inline __int_type
load(memory_order __m = memory_order_seq_cst) const volatile noexcept
{
// __glibcxx_assert(__m != memory_order_release);
// __glibcxx_assert(__m != memory_order_acq_rel);
return __atomic_load_n(&_M_i, __m);
}
__always_inline __int_type
exchange(__int_type __i,
memory_order __m = memory_order_seq_cst) noexcept
{
return __atomic_exchange_n(&_M_i, __i, __m);
}
__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);
}
__always_inline bool
compare_exchange_weak(__int_type& __i1, __int_type __i2,
memory_order __m1, memory_order __m2) noexcept
{
// __glibcxx_assert(__m2 != memory_order_release);
// __glibcxx_assert(__m2 != memory_order_acq_rel);
// __glibcxx_assert(__m2 <= __m1);
return __atomic_compare_exchange_n(&_M_i, &__i1, __i2, 1, __m1, __m2);
}
__always_inline bool
compare_exchange_weak(__int_type& __i1, __int_type __i2,
memory_order __m1,
memory_order __m2) volatile noexcept
{
// __glibcxx_assert(__m2 != memory_order_release);
// __glibcxx_assert(__m2 != memory_order_acq_rel);
// __glibcxx_assert(__m2 <= __m1);
return __atomic_compare_exchange_n(&_M_i, &__i1, __i2, 1, __m1, __m2);
}
__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,
__calculate_memory_order(__m));
}
__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,
__calculate_memory_order(__m));
}
__always_inline bool
compare_exchange_strong(__int_type& __i1, __int_type __i2,
memory_order __m1, memory_order __m2) noexcept
{
// __glibcxx_assert(__m2 != memory_order_release);
// __glibcxx_assert(__m2 != memory_order_acq_rel);
// __glibcxx_assert(__m2 <= __m1);
return __atomic_compare_exchange_n(&_M_i, &__i1, __i2, 0, __m1, __m2);
}
__always_inline bool
compare_exchange_strong(__int_type& __i1, __int_type __i2,
memory_order __m1,
memory_order __m2) volatile noexcept
{
// __glibcxx_assert(__m2 != memory_order_release);
// __glibcxx_assert(__m2 != memory_order_acq_rel);
// __glibcxx_assert(__m2 <= __m1);
return __atomic_compare_exchange_n(&_M_i, &__i1, __i2, 0, __m1, __m2);
}
__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,
__calculate_memory_order(__m));
}
__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,
__calculate_memory_order(__m));
}
__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); }
__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); }
__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); }
__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); }
__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); }
__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); }
__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); }
__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); }
__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); }
__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;
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, 1, memory_order_seq_cst); }
__pointer_type
operator++() volatile noexcept
{ return __atomic_add_fetch(&_M_p, 1, memory_order_seq_cst); }
__pointer_type
operator--() noexcept
{ return __atomic_sub_fetch(&_M_p, 1, memory_order_seq_cst); }
__pointer_type
operator--() volatile noexcept
{ return __atomic_sub_fetch(&_M_p, 1, memory_order_seq_cst); }
__pointer_type
operator+=(ptrdiff_t __d) noexcept
{ return __atomic_add_fetch(&_M_p, __d, memory_order_seq_cst); }
__pointer_type
operator+=(ptrdiff_t __d) volatile noexcept
{ return __atomic_add_fetch(&_M_p, __d, memory_order_seq_cst); }
__pointer_type
operator-=(ptrdiff_t __d) noexcept
{ return __atomic_sub_fetch(&_M_p, __d, memory_order_seq_cst); }
__pointer_type
operator-=(ptrdiff_t __d) volatile noexcept
{ return __atomic_sub_fetch(&_M_p, __d, memory_order_seq_cst); }
bool
is_lock_free() const noexcept
{ return __atomic_is_lock_free (sizeof (_M_p), &_M_p); }
bool
is_lock_free() const volatile noexcept
{ return __atomic_is_lock_free (sizeof (_M_p), &_M_p); }
__always_inline void
store(__pointer_type __p,
memory_order __m = memory_order_seq_cst) noexcept
{
// __glibcxx_assert(__m != memory_order_acquire);
// __glibcxx_assert(__m != memory_order_acq_rel);
// __glibcxx_assert(__m != memory_order_consume);
__atomic_store_n(&_M_p, __p, __m);
}
__always_inline void
store(__pointer_type __p,
memory_order __m = memory_order_seq_cst) volatile noexcept
{
// __glibcxx_assert(__m != memory_order_acquire);
// __glibcxx_assert(__m != memory_order_acq_rel);
// __glibcxx_assert(__m != memory_order_consume);
__atomic_store_n(&_M_p, __p, __m);
}
__always_inline __pointer_type
load(memory_order __m = memory_order_seq_cst) const noexcept
{
// __glibcxx_assert(__m != memory_order_release);
// __glibcxx_assert(__m != memory_order_acq_rel);
return __atomic_load_n(&_M_p, __m);
}
__always_inline __pointer_type
load(memory_order __m = memory_order_seq_cst) const volatile noexcept
{
// __glibcxx_assert(__m != memory_order_release);
// __glibcxx_assert(__m != memory_order_acq_rel);
return __atomic_load_n(&_M_p, __m);
}
__always_inline __pointer_type
exchange(__pointer_type __p,
memory_order __m = memory_order_seq_cst) noexcept
{
return __atomic_exchange_n(&_M_p, __p, __m);
}
__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);
}
__always_inline bool
compare_exchange_strong(__pointer_type& __p1, __pointer_type __p2,
memory_order __m1,
memory_order __m2) noexcept
{
// __glibcxx_assert(__m2 != memory_order_release);
// __glibcxx_assert(__m2 != memory_order_acq_rel);
// __glibcxx_assert(__m2 <= __m1);
return __atomic_compare_exchange_n(&_M_p, &__p1, __p2, 0, __m1, __m2);
}
__always_inline bool
compare_exchange_strong(__pointer_type& __p1, __pointer_type __p2,
memory_order __m1,
memory_order __m2) volatile noexcept
{
// __glibcxx_assert(__m2 != memory_order_release);
// __glibcxx_assert(__m2 != memory_order_acq_rel);
// __glibcxx_assert(__m2 <= __m1);
return __atomic_compare_exchange_n(&_M_p, &__p1, __p2, 0, __m1, __m2);
}
__always_inline __pointer_type
fetch_add(ptrdiff_t __d,
memory_order __m = memory_order_seq_cst) noexcept
{ return __atomic_fetch_add(&_M_p, __d, __m); }
__always_inline __pointer_type
fetch_add(ptrdiff_t __d,
memory_order __m = memory_order_seq_cst) volatile noexcept
{ return __atomic_fetch_add(&_M_p, __d, __m); }
__always_inline __pointer_type
fetch_sub(ptrdiff_t __d,
memory_order __m = memory_order_seq_cst) noexcept
{ return __atomic_fetch_sub(&_M_p, __d, __m); }
__always_inline __pointer_type
fetch_sub(ptrdiff_t __d,
memory_order __m = memory_order_seq_cst) volatile noexcept
{ return __atomic_fetch_sub(&_M_p, __d, __m); }
};
/**
* @addtogroup atomics
* @{
*/
/// atomic_bool
// NB: No operators or fetch-operations for this type.
struct atomic_bool
{
private:
__atomic_base<bool> _M_base;
public:
atomic_bool() noexcept = default;
~atomic_bool() noexcept = default;
atomic_bool(const atomic_bool&) = delete;
atomic_bool& operator=(const atomic_bool&) = delete;
atomic_bool& operator=(const atomic_bool&) volatile = delete;
constexpr atomic_bool(bool __i) noexcept : _M_base(__i) { }
bool
operator=(bool __i) 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(); }
__always_inline void
store(bool __i, memory_order __m = memory_order_seq_cst) noexcept
{ _M_base.store(__i, __m); }
__always_inline void
store(bool __i, memory_order __m = memory_order_seq_cst) volatile noexcept
{ _M_base.store(__i, __m); }
__always_inline bool
load(memory_order __m = memory_order_seq_cst) const noexcept
{ return _M_base.load(__m); }
__always_inline bool
load(memory_order __m = memory_order_seq_cst) const volatile noexcept
{ return _M_base.load(__m); }
__always_inline bool
exchange(bool __i, memory_order __m = memory_order_seq_cst) noexcept
{ return _M_base.exchange(__i, __m); }
__always_inline bool
exchange(bool __i,
memory_order __m = memory_order_seq_cst) volatile noexcept
{ return _M_base.exchange(__i, __m); }
__always_inline 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); }
__always_inline 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); }
__always_inline 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); }
__always_inline 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); }
__always_inline 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); }
__always_inline 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); }
__always_inline 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); }
__always_inline 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); }
};
/// atomic
/// 29.4.3, Generic atomic type, primary class template.
template<typename _Tp>
struct atomic
{
private:
_Tp _M_i;
public:
atomic() noexcept = 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
{ return __atomic_is_lock_free(sizeof(_M_i), &_M_i); }
bool
is_lock_free() const volatile noexcept
{ return __atomic_is_lock_free(sizeof(_M_i), &_M_i); }
void
store(_Tp __i, memory_order _m = memory_order_seq_cst) noexcept
{ __atomic_store(&_M_i, &__i, _m); }
__always_inline void
store(_Tp __i, memory_order _m = memory_order_seq_cst) volatile noexcept
{ __atomic_store(&_M_i, &__i, _m); }
__always_inline _Tp
load(memory_order _m = memory_order_seq_cst) const noexcept
{
_Tp tmp;
__atomic_load(&_M_i, &tmp, _m);
return tmp;
}
__always_inline _Tp
load(memory_order _m = memory_order_seq_cst) const volatile noexcept
{
_Tp tmp;
__atomic_load(&_M_i, &tmp, _m);
return tmp;