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bdc05efbc8
2011-08-04 Paolo Carlini <paolo.carlini@oracle.com> * src/atomic.cc: Use noexcept. * include/std/atomic: Likewise. * include/bits/atomic_0.h: Likewise. * include/bits/atomic_2.h: Likewise. * include/bits/atomic_base.h: Likewise. From-SVN: r177413
296 lines
7.9 KiB
C++
296 lines
7.9 KiB
C++
// -*- C++ -*- header.
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// Copyright (C) 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file bits/atomic_base.h
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* This is an internal header file, included by other library headers.
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* Do not attempt to use it directly. @headername{atomic}
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*/
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#ifndef _GLIBCXX_ATOMIC_BASE_H
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#define _GLIBCXX_ATOMIC_BASE_H 1
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#pragma GCC system_header
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#include <bits/c++config.h>
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#include <stdbool.h>
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#include <stdint.h>
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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/**
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* @defgroup atomics Atomics
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*
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* Components for performing atomic operations.
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* @{
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*/
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/// Enumeration for memory_order
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typedef enum memory_order
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{
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memory_order_relaxed,
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memory_order_consume,
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memory_order_acquire,
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memory_order_release,
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memory_order_acq_rel,
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memory_order_seq_cst
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} memory_order;
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inline memory_order
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__calculate_memory_order(memory_order __m) noexcept
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{
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const bool __cond1 = __m == memory_order_release;
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const bool __cond2 = __m == memory_order_acq_rel;
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memory_order __mo1(__cond1 ? memory_order_relaxed : __m);
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memory_order __mo2(__cond2 ? memory_order_acquire : __mo1);
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return __mo2;
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}
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void
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atomic_thread_fence(memory_order) noexcept;
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void
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atomic_signal_fence(memory_order) noexcept;
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/// kill_dependency
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template<typename _Tp>
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inline _Tp
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kill_dependency(_Tp __y) noexcept
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{
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_Tp __ret(__y);
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return __ret;
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}
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/**
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* @brief Base type for atomic_flag.
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*
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* Base type is POD with data, allowing atomic_flag to derive from
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* it and meet the standard layout type requirement. In addition to
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* compatibilty with a C interface, this allows different
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* implementations of atomic_flag to use the same atomic operation
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* functions, via a standard conversion to the __atomic_flag_base
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* argument.
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*/
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_GLIBCXX_BEGIN_EXTERN_C
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struct __atomic_flag_base
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{
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bool _M_i;
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};
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_GLIBCXX_END_EXTERN_C
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#define ATOMIC_FLAG_INIT { false }
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// Base types for atomics.
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//
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// Three nested namespaces for atomic implementation details.
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//
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// The nested namespace inlined into std:: is determined by the value
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// of the _GLIBCXX_ATOMIC_PROPERTY macro and the resulting
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// ATOMIC_*_LOCK_FREE macros.
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//
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// 0 == __atomic0 == Never lock-free
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// 1 == __atomic1 == Best available, sometimes lock-free
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// 2 == __atomic2 == Always lock-free
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namespace __atomic0
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{
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struct atomic_flag;
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template<typename _IntTp>
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struct __atomic_base;
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}
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namespace __atomic2
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{
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struct atomic_flag;
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template<typename _IntTp>
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struct __atomic_base;
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}
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namespace __atomic1
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{
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using __atomic2::atomic_flag;
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using __atomic0::__atomic_base;
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}
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/// Lock-free Property
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#if defined(_GLIBCXX_ATOMIC_BUILTINS_1) && defined(_GLIBCXX_ATOMIC_BUILTINS_2) \
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&& defined(_GLIBCXX_ATOMIC_BUILTINS_4) && defined(_GLIBCXX_ATOMIC_BUILTINS_8)
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# define _GLIBCXX_ATOMIC_PROPERTY 2
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# define _GLIBCXX_ATOMIC_NAMESPACE __atomic2
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#elif defined(_GLIBCXX_ATOMIC_BUILTINS_1)
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# define _GLIBCXX_ATOMIC_PROPERTY 1
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# define _GLIBCXX_ATOMIC_NAMESPACE __atomic1
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#else
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# define _GLIBCXX_ATOMIC_PROPERTY 0
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# define _GLIBCXX_ATOMIC_NAMESPACE __atomic0
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#endif
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#define ATOMIC_CHAR_LOCK_FREE _GLIBCXX_ATOMIC_PROPERTY
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#define ATOMIC_CHAR16_T_LOCK_FREE _GLIBCXX_ATOMIC_PROPERTY
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#define ATOMIC_CHAR32_T_LOCK_FREE _GLIBCXX_ATOMIC_PROPERTY
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#define ATOMIC_WCHAR_T_LOCK_FREE _GLIBCXX_ATOMIC_PROPERTY
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#define ATOMIC_SHORT_LOCK_FREE _GLIBCXX_ATOMIC_PROPERTY
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#define ATOMIC_INT_LOCK_FREE _GLIBCXX_ATOMIC_PROPERTY
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#define ATOMIC_LONG_LOCK_FREE _GLIBCXX_ATOMIC_PROPERTY
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#define ATOMIC_LLONG_LOCK_FREE _GLIBCXX_ATOMIC_PROPERTY
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inline namespace _GLIBCXX_ATOMIC_NAMESPACE { }
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/// atomic_char
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typedef __atomic_base<char> atomic_char;
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/// atomic_schar
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typedef __atomic_base<signed char> atomic_schar;
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/// atomic_uchar
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typedef __atomic_base<unsigned char> atomic_uchar;
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/// atomic_short
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typedef __atomic_base<short> atomic_short;
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/// atomic_ushort
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typedef __atomic_base<unsigned short> atomic_ushort;
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/// atomic_int
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typedef __atomic_base<int> atomic_int;
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/// atomic_uint
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typedef __atomic_base<unsigned int> atomic_uint;
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/// atomic_long
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typedef __atomic_base<long> atomic_long;
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/// atomic_ulong
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typedef __atomic_base<unsigned long> atomic_ulong;
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/// atomic_llong
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typedef __atomic_base<long long> atomic_llong;
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/// atomic_ullong
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typedef __atomic_base<unsigned long long> atomic_ullong;
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/// atomic_wchar_t
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typedef __atomic_base<wchar_t> atomic_wchar_t;
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/// atomic_char16_t
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typedef __atomic_base<char16_t> atomic_char16_t;
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/// atomic_char32_t
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typedef __atomic_base<char32_t> atomic_char32_t;
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/// atomic_char32_t
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typedef __atomic_base<char32_t> atomic_char32_t;
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/// atomic_int_least8_t
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typedef __atomic_base<int_least8_t> atomic_int_least8_t;
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/// atomic_uint_least8_t
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typedef __atomic_base<uint_least8_t> atomic_uint_least8_t;
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/// atomic_int_least16_t
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typedef __atomic_base<int_least16_t> atomic_int_least16_t;
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/// atomic_uint_least16_t
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typedef __atomic_base<uint_least16_t> atomic_uint_least16_t;
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/// atomic_int_least32_t
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typedef __atomic_base<int_least32_t> atomic_int_least32_t;
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/// atomic_uint_least32_t
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typedef __atomic_base<uint_least32_t> atomic_uint_least32_t;
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/// atomic_int_least64_t
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typedef __atomic_base<int_least64_t> atomic_int_least64_t;
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/// atomic_uint_least64_t
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typedef __atomic_base<uint_least64_t> atomic_uint_least64_t;
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/// atomic_int_fast8_t
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typedef __atomic_base<int_fast8_t> atomic_int_fast8_t;
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/// atomic_uint_fast8_t
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typedef __atomic_base<uint_fast8_t> atomic_uint_fast8_t;
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/// atomic_int_fast16_t
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typedef __atomic_base<int_fast16_t> atomic_int_fast16_t;
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/// atomic_uint_fast16_t
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typedef __atomic_base<uint_fast16_t> atomic_uint_fast16_t;
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/// atomic_int_fast32_t
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typedef __atomic_base<int_fast32_t> atomic_int_fast32_t;
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/// atomic_uint_fast32_t
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typedef __atomic_base<uint_fast32_t> atomic_uint_fast32_t;
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/// atomic_int_fast64_t
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typedef __atomic_base<int_fast64_t> atomic_int_fast64_t;
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/// atomic_uint_fast64_t
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typedef __atomic_base<uint_fast64_t> atomic_uint_fast64_t;
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/// atomic_intptr_t
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typedef __atomic_base<intptr_t> atomic_intptr_t;
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/// atomic_uintptr_t
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typedef __atomic_base<uintptr_t> atomic_uintptr_t;
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/// atomic_size_t
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typedef __atomic_base<size_t> atomic_size_t;
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/// atomic_intmax_t
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typedef __atomic_base<intmax_t> atomic_intmax_t;
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/// atomic_uintmax_t
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typedef __atomic_base<uintmax_t> atomic_uintmax_t;
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/// atomic_ptrdiff_t
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typedef __atomic_base<ptrdiff_t> atomic_ptrdiff_t;
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#define ATOMIC_VAR_INIT(_VI) { _VI }
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template<typename _Tp>
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struct atomic;
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template<typename _Tp>
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struct atomic<_Tp*>;
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// @} group atomics
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace std
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#endif
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