Edit: /usr/include/c++/4.4.4/cstdatomic (24336B)
// -*- C++ -*- header.
// Copyright (C) 2008, 2009
// 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
//
.
/** @file cstdatomic
* This is a Standard C++ Library file. You should @c #include this file
* in your programs, rather than any of the "*.h" implementation files.
*
* This is the C++ version of the Standard C Library header @c stdatomic.h,
* and its contents are (mostly) the same as that header, but are all
* contained in the namespace @c std (except for names which are defined
* as macros in C).
*/
// 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_STDATOMIC
#define _GLIBCXX_STDATOMIC 1
#pragma GCC system_header
#ifndef __GXX_EXPERIMENTAL_CXX0X__
# include
#endif
#include
#include
_GLIBCXX_BEGIN_NAMESPACE(std)
/**
* @addtogroup atomics
* @{
*/
/// kill_dependency
template
inline _Tp
kill_dependency(_Tp __y)
{
_Tp ret(__y);
return ret;
}
inline memory_order
__calculate_memory_order(memory_order __m)
{
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;
}
//
// Three nested namespaces for atomic implementation details.
//
// The nested namespace inlined into std:: is determined by the value
// of the _GLIBCXX_ATOMIC_PROPERTY macro and the resulting
// ATOMIC_*_LOCK_FREE macros. See file stdatomic.h.
//
// 0 == __atomic0 == Never lock-free
// 1 == __atomic1 == Best available, sometimes lock-free
// 2 == __atomic2 == Always lock-free
#include
#include
/// atomic
/// 29.4.3, Generic atomic type, primary class template.
template
struct atomic
{
private:
_Tp _M_i;
public:
atomic() = default;
~atomic() = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic(_Tp __i) : _M_i(__i) { }
operator _Tp() const volatile;
_Tp
operator=(_Tp __i) volatile { store(__i); return __i; }
bool
is_lock_free() const volatile;
void
store(_Tp, memory_order = memory_order_seq_cst) volatile;
_Tp
load(memory_order = memory_order_seq_cst) const volatile;
_Tp
exchange(_Tp __i, memory_order = memory_order_seq_cst) volatile;
bool
compare_exchange_weak(_Tp&, _Tp, memory_order, memory_order) volatile;
bool
compare_exchange_strong(_Tp&, _Tp, memory_order, memory_order) volatile;
bool
compare_exchange_weak(_Tp&, _Tp,
memory_order = memory_order_seq_cst) volatile;
bool
compare_exchange_strong(_Tp&, _Tp,
memory_order = memory_order_seq_cst) volatile;
};
/// Partial specialization for pointer types.
template
struct atomic<_Tp*> : atomic_address
{
atomic() = default;
~atomic() = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic(_Tp* __v) : atomic_address(__v) { }
void
store(_Tp*, memory_order = memory_order_seq_cst) volatile;
_Tp*
load(memory_order = memory_order_seq_cst) const volatile;
_Tp*
exchange(_Tp*, memory_order = memory_order_seq_cst) volatile;
bool
compare_exchange_weak(_Tp*&, _Tp*, memory_order, memory_order) volatile;
bool
compare_exchange_strong(_Tp*&, _Tp*, memory_order, memory_order) volatile;
bool
compare_exchange_weak(_Tp*&, _Tp*,
memory_order = memory_order_seq_cst) volatile;
bool
compare_exchange_strong(_Tp*&, _Tp*,
memory_order = memory_order_seq_cst) volatile;
_Tp*
fetch_add(ptrdiff_t, memory_order = memory_order_seq_cst) volatile;
_Tp*
fetch_sub(ptrdiff_t, memory_order = memory_order_seq_cst) volatile;
operator _Tp*() const volatile
{ return load(); }
_Tp*
operator=(_Tp* __v) volatile
{
store(__v);
return __v;
}
_Tp*
operator++(int) volatile { return fetch_add(1); }
_Tp*
operator--(int) volatile { return fetch_sub(1); }
_Tp*
operator++() volatile { return fetch_add(1) + 1; }
_Tp*
operator--() volatile { return fetch_sub(1) - 1; }
_Tp*
operator+=(ptrdiff_t __d) volatile
{ return fetch_add(__d) + __d; }
_Tp*
operator-=(ptrdiff_t __d) volatile
{ return fetch_sub(__d) - __d; }
};
/// Explicit specialization for void*
template<>
struct atomic : public atomic_address
{
typedef void* __integral_type;
typedef atomic_address __base_type;
atomic() = default;
~atomic() = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic(__integral_type __i) : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
};
/// Explicit specialization for bool.
template<>
struct atomic : public atomic_bool
{
typedef bool __integral_type;
typedef atomic_bool __base_type;
atomic() = default;
~atomic() = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic(__integral_type __i) : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
};
/// Explicit specialization for char.
template<>
struct atomic : public atomic_char
{
typedef char __integral_type;
typedef atomic_char __base_type;
atomic() = default;
~atomic() = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic(__integral_type __i) : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
};
/// Explicit specialization for signed char.
template<>
struct atomic : public atomic_schar
{
typedef signed char __integral_type;
typedef atomic_schar __base_type;
atomic() = default;
~atomic() = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic(__integral_type __i) : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
};
/// Explicit specialization for unsigned char.
template<>
struct atomic : public atomic_uchar
{
typedef unsigned char __integral_type;
typedef atomic_uchar __base_type;
atomic() = default;
~atomic() = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic(__integral_type __i) : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
};
/// Explicit specialization for short.
template<>
struct atomic : public atomic_short
{
typedef short __integral_type;
typedef atomic_short __base_type;
atomic() = default;
~atomic() = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic(__integral_type __i) : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
};
/// Explicit specialization for unsigned short.
template<>
struct atomic : public atomic_ushort
{
typedef unsigned short __integral_type;
typedef atomic_ushort __base_type;
atomic() = default;
~atomic() = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic(__integral_type __i) : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
};
/// Explicit specialization for int.
template<>
struct atomic : atomic_int
{
typedef int __integral_type;
typedef atomic_int __base_type;
atomic() = default;
~atomic() = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic(__integral_type __i) : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
};
/// Explicit specialization for unsigned int.
template<>
struct atomic : public atomic_uint
{
typedef unsigned int __integral_type;
typedef atomic_uint __base_type;
atomic() = default;
~atomic() = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic(__integral_type __i) : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
};
/// Explicit specialization for long.
template<>
struct atomic : public atomic_long
{
typedef long __integral_type;
typedef atomic_long __base_type;
atomic() = default;
~atomic() = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic(__integral_type __i) : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
};
/// Explicit specialization for unsigned long.
template<>
struct atomic : public atomic_ulong
{
typedef unsigned long __integral_type;
typedef atomic_ulong __base_type;
atomic() = default;
~atomic() = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic(__integral_type __i) : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
};
/// Explicit specialization for long long.
template<>
struct atomic : public atomic_llong
{
typedef long long __integral_type;
typedef atomic_llong __base_type;
atomic() = default;
~atomic() = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic(__integral_type __i) : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
};
/// Explicit specialization for unsigned long long.
template<>
struct atomic : public atomic_ullong
{
typedef unsigned long long __integral_type;
typedef atomic_ullong __base_type;
atomic() = default;
~atomic() = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic(__integral_type __i) : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
};
/// Explicit specialization for wchar_t.
template<>
struct atomic : public atomic_wchar_t
{
typedef wchar_t __integral_type;
typedef atomic_wchar_t __base_type;
atomic() = default;
~atomic() = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic(__integral_type __i) : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
};
/// Explicit specialization for char16_t.
template<>
struct atomic : public atomic_char16_t
{
typedef char16_t __integral_type;
typedef atomic_char16_t __base_type;
atomic() = default;
~atomic() = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic(__integral_type __i) : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
};
/// Explicit specialization for char32_t.
template<>
struct atomic : public atomic_char32_t
{
typedef char32_t __integral_type;
typedef atomic_char32_t __base_type;
atomic() = default;
~atomic() = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic(__integral_type __i) : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
};
template
_Tp*
atomic<_Tp*>::load(memory_order __m) const volatile
{ return static_cast<_Tp*>(atomic_address::load(__m)); }
template
_Tp*
atomic<_Tp*>::exchange(_Tp* __v, memory_order __m) volatile
{ return static_cast<_Tp*>(atomic_address::exchange(__v, __m)); }
template
bool
atomic<_Tp*>::compare_exchange_weak(_Tp*& __r, _Tp* __v, memory_order __m1,
memory_order __m2) volatile
{
void** __vr = reinterpret_cast(&__r);
void* __vv = static_cast(__v);
return atomic_address::compare_exchange_weak(*__vr, __vv, __m1, __m2);
}
template
bool
atomic<_Tp*>::compare_exchange_strong(_Tp*& __r, _Tp* __v,
memory_order __m1,
memory_order __m2) volatile
{
void** __vr = reinterpret_cast(&__r);
void* __vv = static_cast(__v);
return atomic_address::compare_exchange_strong(*__vr, __vv, __m1, __m2);
}
template
bool
atomic<_Tp*>::compare_exchange_weak(_Tp*& __r, _Tp* __v,
memory_order __m) volatile
{
return compare_exchange_weak(__r, __v, __m,
__calculate_memory_order(__m));
}
template
bool
atomic<_Tp*>::compare_exchange_strong(_Tp*& __r, _Tp* __v,
memory_order __m) volatile
{
return compare_exchange_strong(__r, __v, __m,
__calculate_memory_order(__m));
}
template
_Tp*
atomic<_Tp*>::fetch_add(ptrdiff_t __d, memory_order __m) volatile
{
void* __p = atomic_fetch_add_explicit(this, sizeof(_Tp) * __d, __m);
return static_cast<_Tp*>(__p);
}
template
_Tp*
atomic<_Tp*>::fetch_sub(ptrdiff_t __d, memory_order __m) volatile
{
void* __p = atomic_fetch_sub_explicit(this, sizeof(_Tp) * __d, __m);
return static_cast<_Tp*>(__p);
}
// Convenience function definitions, atomic_flag.
inline bool
atomic_flag_test_and_set_explicit(volatile atomic_flag* __a, memory_order __m)
{ return __a->test_and_set(__m); }
inline void
atomic_flag_clear_explicit(volatile atomic_flag* __a, memory_order __m)
{ return __a->clear(__m); }
// Convenience function definitions, atomic_address.
inline bool
atomic_is_lock_free(const volatile atomic_address* __a)
{ return __a->is_lock_free(); }
inline void
atomic_store(volatile atomic_address* __a, void* __v)
{ __a->store(__v); }
inline void
atomic_store_explicit(volatile atomic_address* __a, void* __v,
memory_order __m)
{ __a->store(__v, __m); }
inline void*
atomic_load(const volatile atomic_address* __a)
{ return __a->load(); }
inline void*
atomic_load_explicit(const volatile atomic_address* __a, memory_order __m)
{ return __a->load(__m); }
inline void*
atomic_exchange(volatile atomic_address* __a, void* __v)
{ return __a->exchange(__v); }
inline void*
atomic_exchange_explicit(volatile atomic_address* __a, void* __v,
memory_order __m)
{ return __a->exchange(__v, __m); }
inline bool
atomic_compare_exchange_weak(volatile atomic_address* __a,
void** __v1, void* __v2)
{
return __a->compare_exchange_weak(*__v1, __v2, memory_order_seq_cst,
memory_order_seq_cst);
}
inline bool
atomic_compare_exchange_strong(volatile atomic_address* __a,
void** __v1, void* __v2)
{
return __a->compare_exchange_strong(*__v1, __v2, memory_order_seq_cst,
memory_order_seq_cst);
}
inline bool
atomic_compare_exchange_weak_explicit(volatile atomic_address* __a,
void** __v1, void* __v2,
memory_order __m1, memory_order __m2)
{ return __a->compare_exchange_weak(*__v1, __v2, __m1, __m2); }
inline bool
atomic_compare_exchange_strong_explicit(volatile atomic_address* __a,
void** __v1, void* __v2,
memory_order __m1, memory_order __m2)
{ return __a->compare_exchange_strong(*__v1, __v2, __m1, __m2); }
inline void*
atomic_fetch_add_explicit(volatile atomic_address* __a, ptrdiff_t __d,
memory_order __m)
{ return __a->fetch_add(__d, __m); }
inline void*
atomic_fetch_add(volatile atomic_address* __a, ptrdiff_t __d)
{ return __a->fetch_add(__d); }
inline void*
atomic_fetch_sub_explicit(volatile atomic_address* __a, ptrdiff_t __d,
memory_order __m)
{ return __a->fetch_sub(__d, __m); }
inline void*
atomic_fetch_sub(volatile atomic_address* __a, ptrdiff_t __d)
{ return __a->fetch_sub(__d); }
// Convenience function definitions, atomic_bool.
inline bool
atomic_is_lock_free(const volatile atomic_bool* __a)
{ return __a->is_lock_free(); }
inline void
atomic_store(volatile atomic_bool* __a, bool __i)
{ __a->store(__i); }
inline void
atomic_store_explicit(volatile atomic_bool* __a, bool __i, memory_order __m)
{ __a->store(__i, __m); }
inline bool
atomic_load(const volatile atomic_bool* __a)
{ return __a->load(); }
inline bool
atomic_load_explicit(const volatile atomic_bool* __a, memory_order __m)
{ return __a->load(__m); }
inline bool
atomic_exchange(volatile atomic_bool* __a, bool __i)
{ return __a->exchange(__i); }
inline bool
atomic_exchange_explicit(volatile atomic_bool* __a, bool __i,
memory_order __m)
{ return __a->exchange(__i, __m); }
inline bool
atomic_compare_exchange_weak(volatile atomic_bool* __a, bool* __i1, bool __i2)
{
return __a->compare_exchange_weak(*__i1, __i2, memory_order_seq_cst,
memory_order_seq_cst);
}
inline bool
atomic_compare_exchange_strong(volatile atomic_bool* __a,
bool* __i1, bool __i2)
{
return __a->compare_exchange_strong(*__i1, __i2, memory_order_seq_cst,
memory_order_seq_cst);
}
inline bool
atomic_compare_exchange_weak_explicit(volatile atomic_bool* __a, bool* __i1,
bool __i2, memory_order __m1,
memory_order __m2)
{ return __a->compare_exchange_weak(*__i1, __i2, __m1, __m2); }
inline bool
atomic_compare_exchange_strong_explicit(volatile atomic_bool* __a,
bool* __i1, bool __i2,
memory_order __m1, memory_order __m2)
{ return __a->compare_exchange_strong(*__i1, __i2, __m1, __m2); }
// Free standing functions. Template argument should be constricted
// to intergral types as specified in the standard.
template
inline void
atomic_store_explicit(volatile __atomic_base<_ITp>* __a, _ITp __i,
memory_order __m)
{ __a->store(__i, __m); }
template
inline _ITp
atomic_load_explicit(const volatile __atomic_base<_ITp>* __a,
memory_order __m)
{ return __a->load(__m); }
template
inline _ITp
atomic_exchange_explicit(volatile __atomic_base<_ITp>* __a,
_ITp __i, memory_order __m)
{ return __a->exchange(__i, __m); }
template
inline bool
atomic_compare_exchange_weak_explicit(volatile __atomic_base<_ITp>* __a,
_ITp* __i1, _ITp __i2,
memory_order __m1, memory_order __m2)
{ return __a->compare_exchange_weak(*__i1, __i2, __m1, __m2); }
template
inline bool
atomic_compare_exchange_strong_explicit(volatile __atomic_base<_ITp>* __a,
_ITp* __i1, _ITp __i2,
memory_order __m1,
memory_order __m2)
{ return __a->compare_exchange_strong(*__i1, __i2, __m1, __m2); }
template
inline _ITp
atomic_fetch_add_explicit(volatile __atomic_base<_ITp>* __a, _ITp __i,
memory_order __m)
{ return __a->fetch_add(__i, __m); }
template
inline _ITp
atomic_fetch_sub_explicit(volatile __atomic_base<_ITp>* __a, _ITp __i,
memory_order __m)
{ return __a->fetch_sub(__i, __m); }
template
inline _ITp
atomic_fetch_and_explicit(volatile __atomic_base<_ITp>* __a, _ITp __i,
memory_order __m)
{ return __a->fetch_and(__i, __m); }
template
inline _ITp
atomic_fetch_or_explicit(volatile __atomic_base<_ITp>* __a, _ITp __i,
memory_order __m)
{ return __a->fetch_or(__i, __m); }
template
inline _ITp
atomic_fetch_xor_explicit(volatile __atomic_base<_ITp>* __a, _ITp __i,
memory_order __m)
{ return __a->fetch_xor(__i, __m); }
template
inline bool
atomic_is_lock_free(const volatile __atomic_base<_ITp>* __a)
{ return __a->is_lock_free(); }
template
inline void
atomic_store(volatile __atomic_base<_ITp>* __a, _ITp __i)
{ atomic_store_explicit(__a, __i, memory_order_seq_cst); }
template
inline _ITp
atomic_load(const volatile __atomic_base<_ITp>* __a)
{ return atomic_load_explicit(__a, memory_order_seq_cst); }
template
inline _ITp
atomic_exchange(volatile __atomic_base<_ITp>* __a, _ITp __i)
{ return atomic_exchange_explicit(__a, __i, memory_order_seq_cst); }
template
inline bool
atomic_compare_exchange_weak(volatile __atomic_base<_ITp>* __a,
_ITp* __i1, _ITp __i2)
{
return atomic_compare_exchange_weak_explicit(__a, __i1, __i2,
memory_order_seq_cst,
memory_order_seq_cst);
}
template
inline bool
atomic_compare_exchange_strong(volatile __atomic_base<_ITp>* __a,
_ITp* __i1, _ITp __i2)
{
return atomic_compare_exchange_strong_explicit(__a, __i1, __i2,
memory_order_seq_cst,
memory_order_seq_cst);
}
template
inline _ITp
atomic_fetch_add(volatile __atomic_base<_ITp>* __a, _ITp __i)
{ return atomic_fetch_add_explicit(__a, __i, memory_order_seq_cst); }
template
inline _ITp
atomic_fetch_sub(volatile __atomic_base<_ITp>* __a, _ITp __i)
{ return atomic_fetch_sub_explicit(__a, __i, memory_order_seq_cst); }
template
inline _ITp
atomic_fetch_and(volatile __atomic_base<_ITp>* __a, _ITp __i)
{ return atomic_fetch_and_explicit(__a, __i, memory_order_seq_cst); }
template
inline _ITp
atomic_fetch_or(volatile __atomic_base<_ITp>* __a, _ITp __i)
{ return atomic_fetch_or_explicit(__a, __i, memory_order_seq_cst); }
template
inline _ITp
atomic_fetch_xor(volatile __atomic_base<_ITp>* __a, _ITp __i)
{ return atomic_fetch_xor_explicit(__a, __i, memory_order_seq_cst); }
// @} group atomics
_GLIBCXX_END_NAMESPACE
#endif