[ceph.git] / ceph / src / boost / libs / atomic / include / boost / atomic / detail / ops_gcc_atomic.hpp

/*
 * Distributed under the Boost Software License, Version 1.0.
 * (See accompanying file LICENSE_1_0.txt or copy at
 * http://www.boost.org/LICENSE_1_0.txt)
 *
 * Copyright (c) 2014 Andrey Semashev
 */
/*!
 * \file   atomic/detail/ops_gcc_atomic.hpp
 *
 * This header contains implementation of the \c operations template.
 */

#ifndef BOOST_ATOMIC_DETAIL_OPS_GCC_ATOMIC_HPP_INCLUDED_
#define BOOST_ATOMIC_DETAIL_OPS_GCC_ATOMIC_HPP_INCLUDED_

#include <boost/memory_order.hpp>
#include <boost/atomic/detail/config.hpp>
#include <boost/atomic/detail/storage_type.hpp>
#include <boost/atomic/detail/operations_fwd.hpp>
#include <boost/atomic/capabilities.hpp>
#if defined(__clang__) && (defined(BOOST_ATOMIC_DETAIL_X86_HAS_CMPXCHG8B) || defined(BOOST_ATOMIC_DETAIL_X86_HAS_CMPXCHG16B))
#include <boost/atomic/detail/ops_gcc_x86_dcas.hpp>
#include <boost/atomic/detail/ops_cas_based.hpp>
#endif

#if __GCC_ATOMIC_LLONG_LOCK_FREE != BOOST_ATOMIC_LLONG_LOCK_FREE || __GCC_ATOMIC_LONG_LOCK_FREE != BOOST_ATOMIC_LONG_LOCK_FREE ||\
    __GCC_ATOMIC_INT_LOCK_FREE != BOOST_ATOMIC_INT_LOCK_FREE || __GCC_ATOMIC_SHORT_LOCK_FREE != BOOST_ATOMIC_SHORT_LOCK_FREE ||\
    __GCC_ATOMIC_CHAR_LOCK_FREE != BOOST_ATOMIC_CHAR_LOCK_FREE || __GCC_ATOMIC_BOOL_LOCK_FREE != BOOST_ATOMIC_BOOL_LOCK_FREE ||\
    __GCC_ATOMIC_WCHAR_T_LOCK_FREE != BOOST_ATOMIC_WCHAR_T_LOCK_FREE
// There are platforms where we need to use larger storage types
#include <boost/atomic/detail/int_sizes.hpp>
#include <boost/atomic/detail/ops_extending_cas_based.hpp>
#endif

#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif

#if defined(__INTEL_COMPILER)
// This is used to suppress warning #32013 described below for Intel Compiler.
// In debug builds the compiler does not inline any functions, so basically
// every atomic function call results in this warning. I don't know any other
// way to selectively disable just this one warning.
#pragma system_header
#endif

namespace boost {
namespace atomics {
namespace detail {

/*!
 * The function converts \c boost::memory_order values to the compiler-specific constants.
 *
 * NOTE: The intention is that the function is optimized away by the compiler, and the
 *       compiler-specific constants are passed to the intrinsics. I know constexpr doesn't
 *       work in this case because the standard atomics interface require memory ordering
 *       constants to be passed as function arguments, at which point they stop being constexpr.
 *       However it is crucial that the compiler sees constants and not runtime values,
 *       because otherwise it just ignores the ordering value and always uses seq_cst.
 *       This is the case with Intel C++ Compiler 14.0.3 (Composer XE 2013 SP1, update 3) and
 *       gcc 4.8.2. Intel Compiler issues a warning in this case:
 *
 *       warning #32013: Invalid memory order specified. Defaulting to seq_cst memory order.
 *
 *       while gcc acts silently.
 *
 *       To mitigate the problem ALL functions, including the atomic<> members must be
 *       declared with BOOST_FORCEINLINE. In this case the compilers are able to see that
 *       all functions are called with constant orderings and call intrinstcts properly.
 *
 *       Unfortunately, this still doesn't work in debug mode as the compiler doesn't
 *       inline functions even when marked with BOOST_FORCEINLINE. In this case all atomic
 *       operaions will be executed with seq_cst semantics.
 */
BOOST_FORCEINLINE BOOST_CONSTEXPR int convert_memory_order_to_gcc(memory_order order) BOOST_NOEXCEPT
{
    return (order == memory_order_relaxed ? __ATOMIC_RELAXED : (order == memory_order_consume ? __ATOMIC_CONSUME :
        (order == memory_order_acquire ? __ATOMIC_ACQUIRE : (order == memory_order_release ? __ATOMIC_RELEASE :
        (order == memory_order_acq_rel ? __ATOMIC_ACQ_REL : __ATOMIC_SEQ_CST)))));
}

template< typename T >
struct gcc_atomic_operations
{
    typedef T storage_type;

    // Note: In the current implementation, gcc_atomic_operations are used onlu when the particularly sized __atomic
    // intrinsics are always lock-free (i.e. the corresponding LOCK_FREE macro is 2). Therefore it is safe to
    // always set is_always_lock_free to true here.
    static BOOST_CONSTEXPR_OR_CONST bool is_always_lock_free = true;

    static BOOST_FORCEINLINE void store(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
    {
        __atomic_store_n(&storage, v, atomics::detail::convert_memory_order_to_gcc(order));
    }

    static BOOST_FORCEINLINE storage_type load(storage_type const volatile& storage, memory_order order) BOOST_NOEXCEPT
    {
        return __atomic_load_n(&storage, atomics::detail::convert_memory_order_to_gcc(order));
    }

    static BOOST_FORCEINLINE storage_type fetch_add(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
    {
        return __atomic_fetch_add(&storage, v, atomics::detail::convert_memory_order_to_gcc(order));
    }

    static BOOST_FORCEINLINE storage_type fetch_sub(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
    {
        return __atomic_fetch_sub(&storage, v, atomics::detail::convert_memory_order_to_gcc(order));
    }

    static BOOST_FORCEINLINE storage_type exchange(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
    {
        return __atomic_exchange_n(&storage, v, atomics::detail::convert_memory_order_to_gcc(order));
    }

    static BOOST_FORCEINLINE bool compare_exchange_strong(
        storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order success_order, memory_order failure_order) BOOST_NOEXCEPT
    {
        return __atomic_compare_exchange_n
        (
            &storage, &expected, desired, false,
            atomics::detail::convert_memory_order_to_gcc(success_order),
            atomics::detail::convert_memory_order_to_gcc(failure_order)
        );
    }

    static BOOST_FORCEINLINE bool compare_exchange_weak(
        storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order success_order, memory_order failure_order) BOOST_NOEXCEPT
    {
        return __atomic_compare_exchange_n
        (
            &storage, &expected, desired, true,
            atomics::detail::convert_memory_order_to_gcc(success_order),
            atomics::detail::convert_memory_order_to_gcc(failure_order)
        );
    }

    static BOOST_FORCEINLINE storage_type fetch_and(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
    {
        return __atomic_fetch_and(&storage, v, atomics::detail::convert_memory_order_to_gcc(order));
    }

    static BOOST_FORCEINLINE storage_type fetch_or(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
    {
        return __atomic_fetch_or(&storage, v, atomics::detail::convert_memory_order_to_gcc(order));
    }

    static BOOST_FORCEINLINE storage_type fetch_xor(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
    {
        return __atomic_fetch_xor(&storage, v, atomics::detail::convert_memory_order_to_gcc(order));
    }

    static BOOST_FORCEINLINE bool test_and_set(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT
    {
        return __atomic_test_and_set(&storage, atomics::detail::convert_memory_order_to_gcc(order));
    }

    static BOOST_FORCEINLINE void clear(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT
    {
        __atomic_clear(const_cast< storage_type* >(&storage), atomics::detail::convert_memory_order_to_gcc(order));
    }

    static BOOST_FORCEINLINE bool is_lock_free(storage_type const volatile& storage) BOOST_NOEXCEPT
    {
        return __atomic_is_lock_free(sizeof(storage_type), &storage);
    }
};

#if BOOST_ATOMIC_INT128_LOCK_FREE > 0
#if defined(__clang__) && defined(BOOST_ATOMIC_DETAIL_X86_HAS_CMPXCHG16B)

// Workaround for clang bug: http://llvm.org/bugs/show_bug.cgi?id=19149
// Clang 3.4 does not implement 128-bit __atomic* intrinsics even though it defines __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16
template< bool Signed >
struct operations< 16u, Signed > :
    public cas_based_operations< gcc_dcas_x86_64< Signed > >
{
};

#else

template< bool Signed >
struct operations< 16u, Signed > :
    public gcc_atomic_operations< typename make_storage_type< 16u, Signed >::type >
{
    typedef typename make_storage_type< 16u, Signed >::aligned aligned_storage_type;
};

#endif
#endif


#if BOOST_ATOMIC_INT64_LOCK_FREE > 0
#if defined(__clang__) && defined(BOOST_ATOMIC_DETAIL_X86_HAS_CMPXCHG8B)

// Workaround for clang bug http://llvm.org/bugs/show_bug.cgi?id=19355
template< bool Signed >
struct operations< 8u, Signed > :
    public cas_based_operations< gcc_dcas_x86< Signed > >
{
};

#elif (BOOST_ATOMIC_DETAIL_SIZEOF_LLONG == 8 && __GCC_ATOMIC_LLONG_LOCK_FREE != BOOST_ATOMIC_LLONG_LOCK_FREE) ||\
    (BOOST_ATOMIC_DETAIL_SIZEOF_LONG == 8 && __GCC_ATOMIC_LONG_LOCK_FREE != BOOST_ATOMIC_LONG_LOCK_FREE) ||\
    (BOOST_ATOMIC_DETAIL_SIZEOF_INT == 8 && __GCC_ATOMIC_INT_LOCK_FREE != BOOST_ATOMIC_INT_LOCK_FREE) ||\
    (BOOST_ATOMIC_DETAIL_SIZEOF_SHORT == 8 && __GCC_ATOMIC_SHORT_LOCK_FREE != BOOST_ATOMIC_SHORT_LOCK_FREE) ||\
    (BOOST_ATOMIC_DETAIL_SIZEOF_WCHAR_T == 8 && __GCC_ATOMIC_WCHAR_T_LOCK_FREE != BOOST_ATOMIC_WCHAR_T_LOCK_FREE)

#define BOOST_ATOMIC_DETAIL_INT64_EXTENDED

template< bool Signed >
struct operations< 8u, Signed > :
    public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 16u, Signed >::type >, 8u, Signed >
{
    typedef typename make_storage_type< 16u, Signed >::aligned aligned_storage_type;
};

#else

template< bool Signed >
struct operations< 8u, Signed > :
    public gcc_atomic_operations< typename make_storage_type< 8u, Signed >::type >
{
    typedef typename make_storage_type< 8u, Signed >::aligned aligned_storage_type;
};

#endif
#endif

#if BOOST_ATOMIC_INT32_LOCK_FREE > 0
#if (BOOST_ATOMIC_DETAIL_SIZEOF_LLONG == 4 && __GCC_ATOMIC_LLONG_LOCK_FREE != BOOST_ATOMIC_LLONG_LOCK_FREE) ||\
    (BOOST_ATOMIC_DETAIL_SIZEOF_LONG == 4 && __GCC_ATOMIC_LONG_LOCK_FREE != BOOST_ATOMIC_LONG_LOCK_FREE) ||\
    (BOOST_ATOMIC_DETAIL_SIZEOF_INT == 4 && __GCC_ATOMIC_INT_LOCK_FREE != BOOST_ATOMIC_INT_LOCK_FREE) ||\
    (BOOST_ATOMIC_DETAIL_SIZEOF_SHORT == 4 && __GCC_ATOMIC_SHORT_LOCK_FREE != BOOST_ATOMIC_SHORT_LOCK_FREE) ||\
    (BOOST_ATOMIC_DETAIL_SIZEOF_WCHAR_T == 4 && __GCC_ATOMIC_WCHAR_T_LOCK_FREE != BOOST_ATOMIC_WCHAR_T_LOCK_FREE)

#define BOOST_ATOMIC_DETAIL_INT32_EXTENDED

#if !defined(BOOST_ATOMIC_DETAIL_INT64_EXTENDED)

template< bool Signed >
struct operations< 4u, Signed > :
    public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 8u, Signed >::type >, 4u, Signed >
{
    typedef typename make_storage_type< 8u, Signed >::aligned aligned_storage_type;
};

#else // !defined(BOOST_ATOMIC_DETAIL_INT64_EXTENDED)

template< bool Signed >
struct operations< 4u, Signed > :
    public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 16u, Signed >::type >, 4u, Signed >
{
    typedef typename make_storage_type< 16u, Signed >::aligned aligned_storage_type;
};

#endif // !defined(BOOST_ATOMIC_DETAIL_INT64_EXTENDED)

#else

template< bool Signed >
struct operations< 4u, Signed > :
    public gcc_atomic_operations< typename make_storage_type< 4u, Signed >::type >
{
    typedef typename make_storage_type< 4u, Signed >::aligned aligned_storage_type;
};

#endif
#endif

#if BOOST_ATOMIC_INT16_LOCK_FREE > 0
#if (BOOST_ATOMIC_DETAIL_SIZEOF_LLONG == 2 && __GCC_ATOMIC_LLONG_LOCK_FREE != BOOST_ATOMIC_LLONG_LOCK_FREE) ||\
    (BOOST_ATOMIC_DETAIL_SIZEOF_LONG == 2 && __GCC_ATOMIC_LONG_LOCK_FREE != BOOST_ATOMIC_LONG_LOCK_FREE) ||\
    (BOOST_ATOMIC_DETAIL_SIZEOF_INT == 2 && __GCC_ATOMIC_INT_LOCK_FREE != BOOST_ATOMIC_INT_LOCK_FREE) ||\
    (BOOST_ATOMIC_DETAIL_SIZEOF_SHORT == 2 && __GCC_ATOMIC_SHORT_LOCK_FREE != BOOST_ATOMIC_SHORT_LOCK_FREE) ||\
    (BOOST_ATOMIC_DETAIL_SIZEOF_WCHAR_T == 2 && __GCC_ATOMIC_WCHAR_T_LOCK_FREE != BOOST_ATOMIC_WCHAR_T_LOCK_FREE)

#define BOOST_ATOMIC_DETAIL_INT16_EXTENDED

#if !defined(BOOST_ATOMIC_DETAIL_INT32_EXTENDED)

template< bool Signed >
struct operations< 2u, Signed > :
    public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 4u, Signed >::type >, 2u, Signed >
{
    typedef typename make_storage_type< 4u, Signed >::aligned aligned_storage_type;
};

#elif !defined(BOOST_ATOMIC_DETAIL_INT64_EXTENDED)

template< bool Signed >
struct operations< 2u, Signed > :
    public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 8u, Signed >::type >, 2u, Signed >
{
    typedef typename make_storage_type< 8u, Signed >::aligned aligned_storage_type;
};

#else

template< bool Signed >
struct operations< 2u, Signed > :
    public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 16u, Signed >::type >, 2u, Signed >
{
    typedef typename make_storage_type< 16u, Signed >::aligned aligned_storage_type;
};

#endif

#else

template< bool Signed >
struct operations< 2u, Signed > :
    public gcc_atomic_operations< typename make_storage_type< 2u, Signed >::type >
{
    typedef typename make_storage_type< 2u, Signed >::aligned aligned_storage_type;
};

#endif
#endif

#if BOOST_ATOMIC_INT8_LOCK_FREE > 0
#if (BOOST_ATOMIC_DETAIL_SIZEOF_LLONG == 1 && __GCC_ATOMIC_LLONG_LOCK_FREE != BOOST_ATOMIC_LLONG_LOCK_FREE) ||\
    (BOOST_ATOMIC_DETAIL_SIZEOF_LONG == 1 && __GCC_ATOMIC_LONG_LOCK_FREE != BOOST_ATOMIC_LONG_LOCK_FREE) ||\
    (BOOST_ATOMIC_DETAIL_SIZEOF_INT == 1 && __GCC_ATOMIC_INT_LOCK_FREE != BOOST_ATOMIC_INT_LOCK_FREE) ||\
    (BOOST_ATOMIC_DETAIL_SIZEOF_SHORT == 1 && __GCC_ATOMIC_SHORT_LOCK_FREE != BOOST_ATOMIC_SHORT_LOCK_FREE) ||\
    (BOOST_ATOMIC_DETAIL_SIZEOF_WCHAR_T == 1 && __GCC_ATOMIC_WCHAR_T_LOCK_FREE != BOOST_ATOMIC_WCHAR_T_LOCK_FREE) ||\
    (__GCC_ATOMIC_CHAR_LOCK_FREE != BOOST_ATOMIC_CHAR_LOCK_FREE) ||\
    (__GCC_ATOMIC_BOOL_LOCK_FREE != BOOST_ATOMIC_BOOL_LOCK_FREE)

#if !defined(BOOST_ATOMIC_DETAIL_INT16_EXTENDED)

template< bool Signed >
struct operations< 1u, Signed > :
    public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 2u, Signed >::type >, 1u, Signed >
{
    typedef typename make_storage_type< 2u, Signed >::aligned aligned_storage_type;
};

#elif !defined(BOOST_ATOMIC_DETAIL_INT32_EXTENDED)

template< bool Signed >
struct operations< 1u, Signed > :
    public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 4u, Signed >::type >, 1u, Signed >
{
    typedef typename make_storage_type< 4u, Signed >::aligned aligned_storage_type;
};

#elif !defined(BOOST_ATOMIC_DETAIL_INT64_EXTENDED)

template< bool Signed >
struct operations< 1u, Signed > :
    public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 8u, Signed >::type >, 1u, Signed >
{
    typedef typename make_storage_type< 8u, Signed >::aligned aligned_storage_type;
};

#else

template< bool Signed >
struct operations< 1u, Signed > :
    public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 16u, Signed >::type >, 1u, Signed >
{
    typedef typename make_storage_type< 16u, Signed >::aligned aligned_storage_type;
};

#endif

#else

template< bool Signed >
struct operations< 1u, Signed > :
    public gcc_atomic_operations< typename make_storage_type< 1u, Signed >::type >
{
    typedef typename make_storage_type< 1u, Signed >::aligned aligned_storage_type;
};

#endif
#endif

#undef BOOST_ATOMIC_DETAIL_INT16_EXTENDED
#undef BOOST_ATOMIC_DETAIL_INT32_EXTENDED
#undef BOOST_ATOMIC_DETAIL_INT64_EXTENDED

BOOST_FORCEINLINE void thread_fence(memory_order order) BOOST_NOEXCEPT
{
    __atomic_thread_fence(atomics::detail::convert_memory_order_to_gcc(order));
}

BOOST_FORCEINLINE void signal_fence(memory_order order) BOOST_NOEXCEPT
{
    __atomic_signal_fence(atomics::detail::convert_memory_order_to_gcc(order));
}

} // namespace detail
} // namespace atomics
} // namespace boost

#endif // BOOST_ATOMIC_DETAIL_OPS_GCC_ATOMIC_HPP_INCLUDED_
Commit	Line	Data
7c673cae FG	1	/*
	2	* Distributed under the Boost Software License, Version 1.0.
	3	* (See accompanying file LICENSE_1_0.txt or copy at
	4	* http://www.boost.org/LICENSE_1_0.txt)
	5	*
	6	* Copyright (c) 2014 Andrey Semashev
	7	*/
	8	/*!
	9	* \file atomic/detail/ops_gcc_atomic.hpp
	10	*
	11	* This header contains implementation of the \c operations template.
	12	*/
	13
	14	#ifndef BOOST_ATOMIC_DETAIL_OPS_GCC_ATOMIC_HPP_INCLUDED_
	15	#define BOOST_ATOMIC_DETAIL_OPS_GCC_ATOMIC_HPP_INCLUDED_
	16
	17	#include <boost/memory_order.hpp>
	18	#include <boost/atomic/detail/config.hpp>
	19	#include <boost/atomic/detail/storage_type.hpp>
	20	#include <boost/atomic/detail/operations_fwd.hpp>
	21	#include <boost/atomic/capabilities.hpp>
	22	#if defined(__clang__) && (defined(BOOST_ATOMIC_DETAIL_X86_HAS_CMPXCHG8B) \|\| defined(BOOST_ATOMIC_DETAIL_X86_HAS_CMPXCHG16B))
	23	#include <boost/atomic/detail/ops_gcc_x86_dcas.hpp>
	24	#include <boost/atomic/detail/ops_cas_based.hpp>
	25	#endif
	26
	27	#if __GCC_ATOMIC_LLONG_LOCK_FREE != BOOST_ATOMIC_LLONG_LOCK_FREE \|\| __GCC_ATOMIC_LONG_LOCK_FREE != BOOST_ATOMIC_LONG_LOCK_FREE \|\|\
	28	__GCC_ATOMIC_INT_LOCK_FREE != BOOST_ATOMIC_INT_LOCK_FREE \|\| __GCC_ATOMIC_SHORT_LOCK_FREE != BOOST_ATOMIC_SHORT_LOCK_FREE \|\|\
	29	__GCC_ATOMIC_CHAR_LOCK_FREE != BOOST_ATOMIC_CHAR_LOCK_FREE \|\| __GCC_ATOMIC_BOOL_LOCK_FREE != BOOST_ATOMIC_BOOL_LOCK_FREE \|\|\
	30	__GCC_ATOMIC_WCHAR_T_LOCK_FREE != BOOST_ATOMIC_WCHAR_T_LOCK_FREE
	31	// There are platforms where we need to use larger storage types
	32	#include <boost/atomic/detail/int_sizes.hpp>
	33	#include <boost/atomic/detail/ops_extending_cas_based.hpp>
	34	#endif
	35
	36	#ifdef BOOST_HAS_PRAGMA_ONCE
	37	#pragma once
	38	#endif
	39
	40	#if defined(__INTEL_COMPILER)
	41	// This is used to suppress warning #32013 described below for Intel Compiler.
	42	// In debug builds the compiler does not inline any functions, so basically
	43	// every atomic function call results in this warning. I don't know any other
	44	// way to selectively disable just this one warning.
	45	#pragma system_header
	46	#endif
	47
	48	namespace boost {
	49	namespace atomics {
	50	namespace detail {
	51
	52	/*!
	53	* The function converts \c boost::memory_order values to the compiler-specific constants.
	54	*
	55	* NOTE: The intention is that the function is optimized away by the compiler, and the
	56	* compiler-specific constants are passed to the intrinsics. I know constexpr doesn't
	57	* work in this case because the standard atomics interface require memory ordering
	58	* constants to be passed as function arguments, at which point they stop being constexpr.
	59	* However it is crucial that the compiler sees constants and not runtime values,
	60	* because otherwise it just ignores the ordering value and always uses seq_cst.
	61	* This is the case with Intel C++ Compiler 14.0.3 (Composer XE 2013 SP1, update 3) and
	62	* gcc 4.8.2. Intel Compiler issues a warning in this case:
	63	*
	64	* warning #32013: Invalid memory order specified. Defaulting to seq_cst memory order.
65	*
66	* while gcc acts silently.
67	*
68	* To mitigate the problem ALL functions, including the atomic<> members must be
69	* declared with BOOST_FORCEINLINE. In this case the compilers are able to see that
70	* all functions are called with constant orderings and call intrinstcts properly.
71	*
72	* Unfortunately, this still doesn't work in debug mode as the compiler doesn't
73	* inline functions even when marked with BOOST_FORCEINLINE. In this case all atomic
74	* operaions will be executed with seq_cst semantics.
75	*/
76	BOOST_FORCEINLINE BOOST_CONSTEXPR int convert_memory_order_to_gcc(memory_order order) BOOST_NOEXCEPT
77	{
78	return (order == memory_order_relaxed ? __ATOMIC_RELAXED : (order == memory_order_consume ? __ATOMIC_CONSUME :
79	(order == memory_order_acquire ? __ATOMIC_ACQUIRE : (order == memory_order_release ? __ATOMIC_RELEASE :
80	(order == memory_order_acq_rel ? __ATOMIC_ACQ_REL : __ATOMIC_SEQ_CST)))));
81	}
82
83	template< typename T >
84	struct gcc_atomic_operations
85	{
86	typedef T storage_type;
87
88	// Note: In the current implementation, gcc_atomic_operations are used onlu when the particularly sized __atomic
89	// intrinsics are always lock-free (i.e. the corresponding LOCK_FREE macro is 2). Therefore it is safe to
90	// always set is_always_lock_free to true here.
91	static BOOST_CONSTEXPR_OR_CONST bool is_always_lock_free = true;
92
93	static BOOST_FORCEINLINE void store(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
94	{
95	__atomic_store_n(&storage, v, atomics::detail::convert_memory_order_to_gcc(order));
96	}
97
98	static BOOST_FORCEINLINE storage_type load(storage_type const volatile& storage, memory_order order) BOOST_NOEXCEPT
99	{
100	return __atomic_load_n(&storage, atomics::detail::convert_memory_order_to_gcc(order));
101	}
102
103	static BOOST_FORCEINLINE storage_type fetch_add(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
104	{
105	return __atomic_fetch_add(&storage, v, atomics::detail::convert_memory_order_to_gcc(order));
106	}
107
108	static BOOST_FORCEINLINE storage_type fetch_sub(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
109	{
110	return __atomic_fetch_sub(&storage, v, atomics::detail::convert_memory_order_to_gcc(order));
111	}
112
113	static BOOST_FORCEINLINE storage_type exchange(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
114	{
115	return __atomic_exchange_n(&storage, v, atomics::detail::convert_memory_order_to_gcc(order));
116	}
117
118	static BOOST_FORCEINLINE bool compare_exchange_strong(
119	storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order success_order, memory_order failure_order) BOOST_NOEXCEPT
120	{
121	return __atomic_compare_exchange_n
122	(
123	&storage, &expected, desired, false,
124	atomics::detail::convert_memory_order_to_gcc(success_order),
125	atomics::detail::convert_memory_order_to_gcc(failure_order)
126	);
127	}
128
129	static BOOST_FORCEINLINE bool compare_exchange_weak(
130	storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order success_order, memory_order failure_order) BOOST_NOEXCEPT
131	{
132	return __atomic_compare_exchange_n
133	(
134	&storage, &expected, desired, true,
135	atomics::detail::convert_memory_order_to_gcc(success_order),
136	atomics::detail::convert_memory_order_to_gcc(failure_order)
137	);
138	}
139
140	static BOOST_FORCEINLINE storage_type fetch_and(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
141	{
142	return __atomic_fetch_and(&storage, v, atomics::detail::convert_memory_order_to_gcc(order));
143	}
144
145	static BOOST_FORCEINLINE storage_type fetch_or(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
146	{
147	return __atomic_fetch_or(&storage, v, atomics::detail::convert_memory_order_to_gcc(order));
148	}
149
150	static BOOST_FORCEINLINE storage_type fetch_xor(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
151	{
152	return __atomic_fetch_xor(&storage, v, atomics::detail::convert_memory_order_to_gcc(order));
153	}
154
155	static BOOST_FORCEINLINE bool test_and_set(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT
156	{
157	return __atomic_test_and_set(&storage, atomics::detail::convert_memory_order_to_gcc(order));
158	}
159
160	static BOOST_FORCEINLINE void clear(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT
161	{
162	__atomic_clear(const_cast< storage_type* >(&storage), atomics::detail::convert_memory_order_to_gcc(order));
163	}
164
165	static BOOST_FORCEINLINE bool is_lock_free(storage_type const volatile& storage) BOOST_NOEXCEPT
166	{
167	return __atomic_is_lock_free(sizeof(storage_type), &storage);
168	}
169	};
170
171	#if BOOST_ATOMIC_INT128_LOCK_FREE > 0
172	#if defined(__clang__) && defined(BOOST_ATOMIC_DETAIL_X86_HAS_CMPXCHG16B)
173
174	// Workaround for clang bug: http://llvm.org/bugs/show_bug.cgi?id=19149
175	// Clang 3.4 does not implement 128-bit __atomic* intrinsics even though it defines __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16
176	template< bool Signed >
177	struct operations< 16u, Signed > :
178	public cas_based_operations< gcc_dcas_x86_64< Signed > >
179	{
180	};
181
182	#else
183
184	template< bool Signed >
185	struct operations< 16u, Signed > :
186	public gcc_atomic_operations< typename make_storage_type< 16u, Signed >::type >
187	{
188	typedef typename make_storage_type< 16u, Signed >::aligned aligned_storage_type;
189	};
190
191	#endif
192	#endif
193
194
195	#if BOOST_ATOMIC_INT64_LOCK_FREE > 0
196	#if defined(__clang__) && defined(BOOST_ATOMIC_DETAIL_X86_HAS_CMPXCHG8B)
197
198	// Workaround for clang bug http://llvm.org/bugs/show_bug.cgi?id=19355
199	template< bool Signed >
200	struct operations< 8u, Signed > :
201	public cas_based_operations< gcc_dcas_x86< Signed > >
202	{
203	};
204
205	#elif (BOOST_ATOMIC_DETAIL_SIZEOF_LLONG == 8 && __GCC_ATOMIC_LLONG_LOCK_FREE != BOOST_ATOMIC_LLONG_LOCK_FREE) \|\|\
206	(BOOST_ATOMIC_DETAIL_SIZEOF_LONG == 8 && __GCC_ATOMIC_LONG_LOCK_FREE != BOOST_ATOMIC_LONG_LOCK_FREE) \|\|\
207	(BOOST_ATOMIC_DETAIL_SIZEOF_INT == 8 && __GCC_ATOMIC_INT_LOCK_FREE != BOOST_ATOMIC_INT_LOCK_FREE) \|\|\
208	(BOOST_ATOMIC_DETAIL_SIZEOF_SHORT == 8 && __GCC_ATOMIC_SHORT_LOCK_FREE != BOOST_ATOMIC_SHORT_LOCK_FREE) \|\|\
209	(BOOST_ATOMIC_DETAIL_SIZEOF_WCHAR_T == 8 && __GCC_ATOMIC_WCHAR_T_LOCK_FREE != BOOST_ATOMIC_WCHAR_T_LOCK_FREE)
210
211	#define BOOST_ATOMIC_DETAIL_INT64_EXTENDED
212
213	template< bool Signed >
214	struct operations< 8u, Signed > :
215	public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 16u, Signed >::type >, 8u, Signed >
216	{
217	typedef typename make_storage_type< 16u, Signed >::aligned aligned_storage_type;
218	};
219
220	#else
221
222	template< bool Signed >
223	struct operations< 8u, Signed > :
224	public gcc_atomic_operations< typename make_storage_type< 8u, Signed >::type >
225	{
226	typedef typename make_storage_type< 8u, Signed >::aligned aligned_storage_type;
227	};
228
229	#endif
230	#endif
231
232	#if BOOST_ATOMIC_INT32_LOCK_FREE > 0
233	#if (BOOST_ATOMIC_DETAIL_SIZEOF_LLONG == 4 && __GCC_ATOMIC_LLONG_LOCK_FREE != BOOST_ATOMIC_LLONG_LOCK_FREE) \|\|\
234	(BOOST_ATOMIC_DETAIL_SIZEOF_LONG == 4 && __GCC_ATOMIC_LONG_LOCK_FREE != BOOST_ATOMIC_LONG_LOCK_FREE) \|\|\
235	(BOOST_ATOMIC_DETAIL_SIZEOF_INT == 4 && __GCC_ATOMIC_INT_LOCK_FREE != BOOST_ATOMIC_INT_LOCK_FREE) \|\|\
236	(BOOST_ATOMIC_DETAIL_SIZEOF_SHORT == 4 && __GCC_ATOMIC_SHORT_LOCK_FREE != BOOST_ATOMIC_SHORT_LOCK_FREE) \|\|\
237	(BOOST_ATOMIC_DETAIL_SIZEOF_WCHAR_T == 4 && __GCC_ATOMIC_WCHAR_T_LOCK_FREE != BOOST_ATOMIC_WCHAR_T_LOCK_FREE)
238
239	#define BOOST_ATOMIC_DETAIL_INT32_EXTENDED
240
241	#if !defined(BOOST_ATOMIC_DETAIL_INT64_EXTENDED)
242
243	template< bool Signed >
244	struct operations< 4u, Signed > :
245	public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 8u, Signed >::type >, 4u, Signed >
246	{
247	typedef typename make_storage_type< 8u, Signed >::aligned aligned_storage_type;
248	};
249
250	#else // !defined(BOOST_ATOMIC_DETAIL_INT64_EXTENDED)
251
252	template< bool Signed >
253	struct operations< 4u, Signed > :
254	public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 16u, Signed >::type >, 4u, Signed >
255	{
256	typedef typename make_storage_type< 16u, Signed >::aligned aligned_storage_type;
257	};
258
259	#endif // !defined(BOOST_ATOMIC_DETAIL_INT64_EXTENDED)
260
261	#else
262
263	template< bool Signed >
264	struct operations< 4u, Signed > :
265	public gcc_atomic_operations< typename make_storage_type< 4u, Signed >::type >
266	{
267	typedef typename make_storage_type< 4u, Signed >::aligned aligned_storage_type;
268	};
269
270	#endif
271	#endif
272
273	#if BOOST_ATOMIC_INT16_LOCK_FREE > 0
274	#if (BOOST_ATOMIC_DETAIL_SIZEOF_LLONG == 2 && __GCC_ATOMIC_LLONG_LOCK_FREE != BOOST_ATOMIC_LLONG_LOCK_FREE) \|\|\
275	(BOOST_ATOMIC_DETAIL_SIZEOF_LONG == 2 && __GCC_ATOMIC_LONG_LOCK_FREE != BOOST_ATOMIC_LONG_LOCK_FREE) \|\|\
276	(BOOST_ATOMIC_DETAIL_SIZEOF_INT == 2 && __GCC_ATOMIC_INT_LOCK_FREE != BOOST_ATOMIC_INT_LOCK_FREE) \|\|\
277	(BOOST_ATOMIC_DETAIL_SIZEOF_SHORT == 2 && __GCC_ATOMIC_SHORT_LOCK_FREE != BOOST_ATOMIC_SHORT_LOCK_FREE) \|\|\
278	(BOOST_ATOMIC_DETAIL_SIZEOF_WCHAR_T == 2 && __GCC_ATOMIC_WCHAR_T_LOCK_FREE != BOOST_ATOMIC_WCHAR_T_LOCK_FREE)
279
280	#define BOOST_ATOMIC_DETAIL_INT16_EXTENDED
281
282	#if !defined(BOOST_ATOMIC_DETAIL_INT32_EXTENDED)
283
284	template< bool Signed >
285	struct operations< 2u, Signed > :
286	public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 4u, Signed >::type >, 2u, Signed >
287	{
288	typedef typename make_storage_type< 4u, Signed >::aligned aligned_storage_type;
289	};
290
291	#elif !defined(BOOST_ATOMIC_DETAIL_INT64_EXTENDED)
292
293	template< bool Signed >
294	struct operations< 2u, Signed > :
295	public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 8u, Signed >::type >, 2u, Signed >
296	{
297	typedef typename make_storage_type< 8u, Signed >::aligned aligned_storage_type;
298	};
299
300	#else
301
302	template< bool Signed >
303	struct operations< 2u, Signed > :
304	public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 16u, Signed >::type >, 2u, Signed >
305	{
306	typedef typename make_storage_type< 16u, Signed >::aligned aligned_storage_type;
307	};
308
309	#endif
310
311	#else
312
313	template< bool Signed >
314	struct operations< 2u, Signed > :
315	public gcc_atomic_operations< typename make_storage_type< 2u, Signed >::type >
316	{
317	typedef typename make_storage_type< 2u, Signed >::aligned aligned_storage_type;
318	};
319
320	#endif
321	#endif
322
323	#if BOOST_ATOMIC_INT8_LOCK_FREE > 0
324	#if (BOOST_ATOMIC_DETAIL_SIZEOF_LLONG == 1 && __GCC_ATOMIC_LLONG_LOCK_FREE != BOOST_ATOMIC_LLONG_LOCK_FREE) \|\|\
325	(BOOST_ATOMIC_DETAIL_SIZEOF_LONG == 1 && __GCC_ATOMIC_LONG_LOCK_FREE != BOOST_ATOMIC_LONG_LOCK_FREE) \|\|\
326	(BOOST_ATOMIC_DETAIL_SIZEOF_INT == 1 && __GCC_ATOMIC_INT_LOCK_FREE != BOOST_ATOMIC_INT_LOCK_FREE) \|\|\
327	(BOOST_ATOMIC_DETAIL_SIZEOF_SHORT == 1 && __GCC_ATOMIC_SHORT_LOCK_FREE != BOOST_ATOMIC_SHORT_LOCK_FREE) \|\|\
328	(BOOST_ATOMIC_DETAIL_SIZEOF_WCHAR_T == 1 && __GCC_ATOMIC_WCHAR_T_LOCK_FREE != BOOST_ATOMIC_WCHAR_T_LOCK_FREE) \|\|\
329	(__GCC_ATOMIC_CHAR_LOCK_FREE != BOOST_ATOMIC_CHAR_LOCK_FREE) \|\|\
330	(__GCC_ATOMIC_BOOL_LOCK_FREE != BOOST_ATOMIC_BOOL_LOCK_FREE)
331
332	#if !defined(BOOST_ATOMIC_DETAIL_INT16_EXTENDED)
333
334	template< bool Signed >
335	struct operations< 1u, Signed > :
336	public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 2u, Signed >::type >, 1u, Signed >
337	{
338	typedef typename make_storage_type< 2u, Signed >::aligned aligned_storage_type;
339	};
340
341	#elif !defined(BOOST_ATOMIC_DETAIL_INT32_EXTENDED)
342
343	template< bool Signed >
344	struct operations< 1u, Signed > :
345	public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 4u, Signed >::type >, 1u, Signed >
346	{
347	typedef typename make_storage_type< 4u, Signed >::aligned aligned_storage_type;
348	};
349
350	#elif !defined(BOOST_ATOMIC_DETAIL_INT64_EXTENDED)
351
352	template< bool Signed >
353	struct operations< 1u, Signed > :
354	public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 8u, Signed >::type >, 1u, Signed >
355	{
356	typedef typename make_storage_type< 8u, Signed >::aligned aligned_storage_type;
357	};
358
359	#else
360
361	template< bool Signed >
362	struct operations< 1u, Signed > :
363	public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 16u, Signed >::type >, 1u, Signed >
364	{
365	typedef typename make_storage_type< 16u, Signed >::aligned aligned_storage_type;
366	};
367
368	#endif
369
370	#else
371
372	template< bool Signed >
373	struct operations< 1u, Signed > :
374	public gcc_atomic_operations< typename make_storage_type< 1u, Signed >::type >
375	{
376	typedef typename make_storage_type< 1u, Signed >::aligned aligned_storage_type;
377	};
378
379	#endif
380	#endif
381
382	#undef BOOST_ATOMIC_DETAIL_INT16_EXTENDED
383	#undef BOOST_ATOMIC_DETAIL_INT32_EXTENDED
384	#undef BOOST_ATOMIC_DETAIL_INT64_EXTENDED
385
386	BOOST_FORCEINLINE void thread_fence(memory_order order) BOOST_NOEXCEPT
387	{
388	__atomic_thread_fence(atomics::detail::convert_memory_order_to_gcc(order));
389	}
390
391	BOOST_FORCEINLINE void signal_fence(memory_order order) BOOST_NOEXCEPT
392	{
393	__atomic_signal_fence(atomics::detail::convert_memory_order_to_gcc(order));
394	}
395
396	} // namespace detail
397	} // namespace atomics
398	} // namespace boost
399
400	#endif // BOOST_ATOMIC_DETAIL_OPS_GCC_ATOMIC_HPP_INCLUDED_