+// -*- C++ -*- compatibility 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
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/atomic_base.h
+ * This is a Standard C++ Library header.
+ */
+
+#include <bits/c++config.h>
+#include <stddef.h>
+#include <stdbool.h> // XXX need to define bool w/o stdbool.h in tr1/cstdbool
+
+#ifndef _GLIBCXX_ATOMIC_BASE_H
+#define _GLIBCXX_ATOMIC_BASE_H 1
+
+_GLIBCXX_BEGIN_NAMESPACE(std)
+_GLIBCXX_BEGIN_EXTERN_C
+
+ /**
+ * @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;
+
+ // Base for atomic_flag.
+ typedef struct __atomic_flag_base
+ {
+ bool _M_i;
+ } __atomic_flag_base;
+
+#define ATOMIC_FLAG_INIT { false }
+
+ /// 29.2 Lock-free Property
+#if defined(_GLIBCXX_ATOMIC_BUILTINS_1) && defined(_GLIBCXX_ATOMIC_BUILTINS_2) \
+ && defined(_GLIBCXX_ATOMIC_BUILTINS_4) && defined(_GLIBCXX_ATOMIC_BUILTINS_8)
+# define _GLIBCXX_ATOMIC_PROPERTY 2
+# define _GLIBCXX_ATOMIC_NAMESPACE __atomic2
+#elif defined(_GLIBCXX_ATOMIC_BUILTINS_1)
+# define _GLIBCXX_ATOMIC_PROPERTY 1
+# define _GLIBCXX_ATOMIC_NAMESPACE __atomic1
+#else
+# define _GLIBCXX_ATOMIC_PROPERTY 0
+# define _GLIBCXX_ATOMIC_NAMESPACE __atomic0
+#endif
+
+#define ATOMIC_INTEGRAL_LOCK_FREE _GLIBCXX_ATOMIC_PROPERTY
+#define ATOMIC_ADDRESS_LOCK_FREE _GLIBCXX_ATOMIC_PROPERTY
+
+ // Switch atomic integral base types based on C or C++. In
+ // addition, for "C" only provide type-generic macros for atomic
+ // operations. (As C++ accomplishes the same thing with sets of
+ // overloaded functions.
+#ifdef __cplusplus
+ inline namespace _GLIBCXX_ATOMIC_NAMESPACE { }
+# include <bits/atomicfwd_cxx.h>
+#else
+# include <bits/atomicfwd_c.h>
+#endif
+
+ // Typedefs for other atomic integral types.
+ typedef atomic_schar atomic_int_least8_t;
+ typedef atomic_uchar atomic_uint_least8_t;
+ typedef atomic_short atomic_int_least16_t;
+ typedef atomic_ushort atomic_uint_least16_t;
+ typedef atomic_int atomic_int_least32_t;
+ typedef atomic_uint atomic_uint_least32_t;
+ typedef atomic_llong atomic_int_least64_t;
+ typedef atomic_ullong atomic_uint_least64_t;
+
+ typedef atomic_schar atomic_int_fast8_t;
+ typedef atomic_uchar atomic_uint_fast8_t;
+ typedef atomic_short atomic_int_fast16_t;
+ typedef atomic_ushort atomic_uint_fast16_t;
+ typedef atomic_int atomic_int_fast32_t;
+ typedef atomic_uint atomic_uint_fast32_t;
+ typedef atomic_llong atomic_int_fast64_t;
+ typedef atomic_ullong atomic_uint_fast64_t;
+
+ typedef atomic_long atomic_intptr_t;
+ typedef atomic_ulong atomic_uintptr_t;
+
+ typedef atomic_long atomic_ssize_t;
+ typedef atomic_ulong atomic_size_t;
+
+ typedef atomic_llong atomic_intmax_t;
+ typedef atomic_ullong atomic_uintmax_t;
+
+ typedef atomic_long atomic_ptrdiff_t;
+
+ // Accessor functions for base atomic_flag type.
+ bool
+ atomic_flag_test_and_set_explicit(__atomic_flag_base*, memory_order)
+ _GLIBCXX_NOTHROW;
+
+ inline bool
+ atomic_flag_test_and_set(__atomic_flag_base* __a)
+ { return atomic_flag_test_and_set_explicit(__a, memory_order_seq_cst); }
+
+ void
+ atomic_flag_clear_explicit(__atomic_flag_base*, memory_order)
+ _GLIBCXX_NOTHROW;
+
+ inline void
+ atomic_flag_clear(__atomic_flag_base* __a)
+ { atomic_flag_clear_explicit(__a, memory_order_seq_cst); }
+
+ void
+ __atomic_flag_wait_explicit(__atomic_flag_base*, memory_order)
+ _GLIBCXX_NOTHROW;
+
+ _GLIBCXX_CONST __atomic_flag_base*
+ __atomic_flag_for_address(const void* __z) _GLIBCXX_NOTHROW;
+
+ // Implementation specific defines.
+#define _ATOMIC_LOAD_(__a, __x) \
+ ({__typeof__ _ATOMIC_MEMBER_* __p = &_ATOMIC_MEMBER_; \
+ atomic_flag* __g = __atomic_flag_for_address(__p); \
+ __atomic_flag_wait_explicit(__g, __x); \
+ __typeof__ _ATOMIC_MEMBER_ __r = *__p; \
+ atomic_flag_clear_explicit(__g, __x); \
+ __r; })
+
+#define _ATOMIC_STORE_(__a, __m, __x) \
+ ({__typeof__ _ATOMIC_MEMBER_* __p = &_ATOMIC_MEMBER_; \
+ __typeof__(__m) __v = (__m); \
+ atomic_flag* __g = __atomic_flag_for_address(__p); \
+ __atomic_flag_wait_explicit(__g, __x); \
+ *__p = __v; \
+ atomic_flag_clear_explicit(__g, __x); \
+ __v; })
+
+#define _ATOMIC_MODIFY_(__a, __o, __m, __x) \
+ ({__typeof__ _ATOMIC_MEMBER_* __p = &_ATOMIC_MEMBER_; \
+ __typeof__(__m) __v = (__m); \
+ atomic_flag* __g = __atomic_flag_for_address(__p); \
+ __atomic_flag_wait_explicit(__g, __x); \
+ __typeof__ _ATOMIC_MEMBER_ __r = *__p; \
+ *__p __o __v; \
+ atomic_flag_clear_explicit(__g, __x); \
+ __r; })
+
+#define _ATOMIC_CMPEXCHNG_(__a, __e, __m, __x) \
+ ({__typeof__ _ATOMIC_MEMBER_* __p = &_ATOMIC_MEMBER_; \
+ __typeof__(__e) __q = (__e); \
+ __typeof__(__m) __v = (__m); \
+ bool __r; \
+ atomic_flag* __g = __atomic_flag_for_address(__p); \
+ __atomic_flag_wait_explicit(__g, __x); \
+ __typeof__ _ATOMIC_MEMBER_ __t__ = *__p; \
+ if (__t__ == *__q) { *__p = __v; __r = true; } \
+ else { *__q = __t__; __r = false; } \
+ atomic_flag_clear_explicit(__g, __x); \
+ __r; })
+
+ // @} group atomics
+
+_GLIBCXX_END_EXTERN_C
+_GLIBCXX_END_NAMESPACE
+
+// Inject into global namespace.
+#ifdef __cplusplus
+
+#include <atomic>
+
+using std::memory_order;
+using std::memory_order_relaxed;
+using std::memory_order_consume;
+using std::memory_order_acquire;
+using std::memory_order_release;
+using std::memory_order_acq_rel;
+using std::memory_order_seq_cst;
+using std::atomic_flag;
+using std::atomic_bool;
+using std::atomic_char;
+using std::atomic_schar;
+using std::atomic_uchar;
+using std::atomic_short;
+using std::atomic_ushort;
+using std::atomic_int;
+using std::atomic_uint;
+using std::atomic_long;
+using std::atomic_ulong;
+using std::atomic_llong;
+using std::atomic_ullong;
+using std::atomic_wchar_t;
+using std::atomic_char16_t;
+using std::atomic_char32_t;
+using std::atomic_address;
+using std::atomic;
+#endif
+
+#endif
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