02be8f4a8a
2009-10-16 Benjamin Kosnik <bkoz@redhat.com> * include/c_compatibility/stdatomic.h: Include cstdatomic if __cplusplus. From-SVN: r152918
222 lines
7.2 KiB
C++
222 lines
7.2 KiB
C++
// -*- C++ -*- compatibility header.
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// Copyright (C) 2008, 2009 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 stdatomic.h
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* This is a Standard C++ Library header.
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*/
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#include <bits/c++config.h>
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#include <stddef.h>
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#include <stdbool.h> // XXX need to define bool w/o stdbool.h in tr1/cstdbool
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#ifndef _GLIBCXX_STDATOMIC_H
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#define _GLIBCXX_STDATOMIC_H 1
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_GLIBCXX_BEGIN_NAMESPACE(std)
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_GLIBCXX_BEGIN_EXTERN_C
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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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// Base for atomic_flag.
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typedef struct __atomic_flag_base
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{
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bool _M_i;
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} __atomic_flag_base;
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#define ATOMIC_FLAG_INIT { false }
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/// 29.2 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_INTEGRAL_LOCK_FREE _GLIBCXX_ATOMIC_PROPERTY
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#define ATOMIC_ADDRESS_LOCK_FREE _GLIBCXX_ATOMIC_PROPERTY
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// Switch atomic integral base types based on C or C++. In
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// addition, for "C" only provide type-generic macros for atomic
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// operations. (As C++ accomplishes the same thing with sets of
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// overloaded functions.
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#ifdef __cplusplus
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inline namespace _GLIBCXX_ATOMIC_NAMESPACE { }
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# include <bits/atomicfwd_cxx.h>
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#else
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# include <bits/atomicfwd_c.h>
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#endif
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// Typedefs for other atomic integral types.
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typedef atomic_schar atomic_int_least8_t;
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typedef atomic_uchar atomic_uint_least8_t;
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typedef atomic_short atomic_int_least16_t;
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typedef atomic_ushort atomic_uint_least16_t;
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typedef atomic_int atomic_int_least32_t;
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typedef atomic_uint atomic_uint_least32_t;
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typedef atomic_llong atomic_int_least64_t;
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typedef atomic_ullong atomic_uint_least64_t;
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typedef atomic_schar atomic_int_fast8_t;
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typedef atomic_uchar atomic_uint_fast8_t;
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typedef atomic_short atomic_int_fast16_t;
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typedef atomic_ushort atomic_uint_fast16_t;
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typedef atomic_int atomic_int_fast32_t;
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typedef atomic_uint atomic_uint_fast32_t;
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typedef atomic_llong atomic_int_fast64_t;
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typedef atomic_ullong atomic_uint_fast64_t;
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typedef atomic_long atomic_intptr_t;
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typedef atomic_ulong atomic_uintptr_t;
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typedef atomic_long atomic_ssize_t;
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typedef atomic_ulong atomic_size_t;
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typedef atomic_llong atomic_intmax_t;
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typedef atomic_ullong atomic_uintmax_t;
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typedef atomic_long atomic_ptrdiff_t;
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// Accessor functions for base atomic_flag type.
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bool
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atomic_flag_test_and_set_explicit(volatile __atomic_flag_base*, memory_order) _GLIBCXX_NOTHROW;
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inline bool
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atomic_flag_test_and_set(volatile __atomic_flag_base* __a)
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{ return atomic_flag_test_and_set_explicit(__a, memory_order_seq_cst); }
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void
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atomic_flag_clear_explicit(volatile __atomic_flag_base*, memory_order) _GLIBCXX_NOTHROW;
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inline void
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atomic_flag_clear(volatile __atomic_flag_base* __a)
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{ atomic_flag_clear_explicit(__a, memory_order_seq_cst); }
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void
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__atomic_flag_wait_explicit(volatile __atomic_flag_base*, memory_order) _GLIBCXX_NOTHROW;
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_GLIBCXX_CONST volatile __atomic_flag_base*
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__atomic_flag_for_address(const volatile void* __z) _GLIBCXX_NOTHROW;
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// Implementation specific defines.
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#define _ATOMIC_LOAD_(__a, __x) \
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({ volatile __typeof__ _ATOMIC_MEMBER_* __p = &_ATOMIC_MEMBER_; \
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volatile atomic_flag* __g = __atomic_flag_for_address(__p); \
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__atomic_flag_wait_explicit(__g, __x); \
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__typeof__ _ATOMIC_MEMBER_ __r = *__p; \
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atomic_flag_clear_explicit(__g, __x); \
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__r; })
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#define _ATOMIC_STORE_(__a, __m, __x) \
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({ volatile __typeof__ _ATOMIC_MEMBER_* __p = &_ATOMIC_MEMBER_; \
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__typeof__(__m) __v = (__m); \
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volatile atomic_flag* __g = __atomic_flag_for_address(__p); \
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__atomic_flag_wait_explicit(__g, __x); \
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*__p = __v; \
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atomic_flag_clear_explicit(__g, __x); \
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__v; })
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#define _ATOMIC_MODIFY_(__a, __o, __m, __x) \
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({ volatile __typeof__ _ATOMIC_MEMBER_* __p = &_ATOMIC_MEMBER_; \
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__typeof__(__m) __v = (__m); \
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volatile atomic_flag* __g = __atomic_flag_for_address(__p); \
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__atomic_flag_wait_explicit(__g, __x); \
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__typeof__ _ATOMIC_MEMBER_ __r = *__p; \
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*__p __o __v; \
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atomic_flag_clear_explicit(__g, __x); \
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__r; })
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#define _ATOMIC_CMPEXCHNG_(__a, __e, __m, __x) \
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({ volatile __typeof__ _ATOMIC_MEMBER_* __p = &_ATOMIC_MEMBER_; \
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__typeof__(__e) __q = (__e); \
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__typeof__(__m) __v = (__m); \
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bool __r; \
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volatile atomic_flag* __g = __atomic_flag_for_address(__p); \
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__atomic_flag_wait_explicit(__g, __x); \
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__typeof__ _ATOMIC_MEMBER_ __t__ = *__p; \
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if (__t__ == *__q) { *__p = __v; __r = true; } \
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else { *__q = __t__; __r = false; } \
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atomic_flag_clear_explicit(__g, __x); \
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__r; })
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// @} group atomics
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_GLIBCXX_END_EXTERN_C
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_GLIBCXX_END_NAMESPACE
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// Inject into global namespace.
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#ifdef __cplusplus
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#include <cstdatomic>
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using std::memory_order;
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using std::memory_order_relaxed;
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using std::memory_order_consume;
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using std::memory_order_acquire;
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using std::memory_order_release;
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using std::memory_order_acq_rel;
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using std::memory_order_seq_cst;
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using std::atomic_flag;
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using std::atomic_bool;
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using std::atomic_char;
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using std::atomic_schar;
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using std::atomic_uchar;
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using std::atomic_short;
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using std::atomic_ushort;
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using std::atomic_int;
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using std::atomic_uint;
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using std::atomic_long;
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using std::atomic_ulong;
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using std::atomic_llong;
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using std::atomic_ullong;
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using std::atomic_wchar_t;
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using std::atomic_char16_t;
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using std::atomic_char32_t;
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using std::atomic_address;
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using std::atomic;
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#endif
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#endif
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