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type_traits/	-	0755	rm
addressof.hpp	1973	0644	edit dl rm
aligned_variable.hpp	1853	0644	edit dl rm
atomic_flag_impl.hpp	4525	0644	edit dl rm
atomic_impl.hpp	56095	0644	edit dl rm
atomic_ref_impl.hpp	54073	0644	edit dl rm
bitwise_cast.hpp	2691	0644	edit dl rm
bitwise_fp_cast.hpp	2509	0644	edit dl rm
capabilities.hpp	7520	0644	edit dl rm
caps_arch_gcc_aarch32.hpp	1617	0644	edit dl rm
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caps_arch_gcc_alpha.hpp	940	0644	edit dl rm
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caps_arch_gcc_ppc.hpp	1581	0644	edit dl rm
caps_arch_gcc_sparc.hpp	940	0644	edit dl rm
caps_arch_gcc_x86.hpp	2013	0644	edit dl rm
caps_arch_msvc_arm.hpp	943	0644	edit dl rm
caps_arch_msvc_x86.hpp	1698	0644	edit dl rm
caps_gcc_atomic.hpp	7438	0644	edit dl rm
caps_gcc_sync.hpp	1715	0644	edit dl rm
caps_linux_arm.hpp	963	0644	edit dl rm
caps_windows.hpp	880	0644	edit dl rm
cas_based_exchange.hpp	1348	0644	edit dl rm
classify.hpp	2133	0644	edit dl rm
config.hpp	7945	0644	edit dl rm
core_arch_operations.hpp	1481	0644	edit dl rm
core_arch_operations_fwd.hpp	972	0644	edit dl rm
core_arch_ops_gcc_aarch32.hpp	41910	0644	edit dl rm
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core_arch_ops_gcc_alpha.hpp	27813	0644	edit dl rm
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core_arch_ops_gcc_ppc.hpp	39185	0644	edit dl rm
core_arch_ops_gcc_sparc.hpp	7480	0644	edit dl rm
core_arch_ops_gcc_x86.hpp	39479	0644	edit dl rm
core_arch_ops_msvc_arm.hpp	34246	0644	edit dl rm
core_arch_ops_msvc_x86.hpp	31645	0644	edit dl rm
core_operations.hpp	1322	0644	edit dl rm
core_operations_emulated.hpp	8138	0644	edit dl rm
core_operations_emulated_fwd.hpp	1024	0644	edit dl rm
core_operations_fwd.hpp	942	0644	edit dl rm
core_ops_cas_based.hpp	3281	0644	edit dl rm
core_ops_gcc_atomic.hpp	12238	0644	edit dl rm
core_ops_gcc_sync.hpp	10690	0644	edit dl rm
core_ops_linux_arm.hpp	6364	0644	edit dl rm
core_ops_windows.hpp	7766	0644	edit dl rm
extending_cas_based_arithmetic.hpp	2441	0644	edit dl rm
extra_fp_operations.hpp	867	0644	edit dl rm
extra_fp_operations_fwd.hpp	1065	0644	edit dl rm
extra_fp_ops_emulated.hpp	4864	0644	edit dl rm
extra_fp_ops_generic.hpp	7222	0644	edit dl rm
extra_operations.hpp	825	0644	edit dl rm
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extra_ops_generic.hpp	17217	0644	edit dl rm
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fence_arch_operations.hpp	1077	0644	edit dl rm
fence_arch_ops_gcc_aarch32.hpp	1701	0644	edit dl rm
fence_arch_ops_gcc_aarch64.hpp	1624	0644	edit dl rm
fence_arch_ops_gcc_alpha.hpp	1411	0644	edit dl rm
fence_arch_ops_gcc_arm.hpp	2769	0644	edit dl rm
fence_arch_ops_gcc_ppc.hpp	1773	0644	edit dl rm
fence_arch_ops_gcc_sparc.hpp	2002	0644	edit dl rm
fence_arch_ops_gcc_x86.hpp	2557	0644	edit dl rm
fence_arch_ops_msvc_arm.hpp	1787	0644	edit dl rm
fence_arch_ops_msvc_x86.hpp	1998	0644	edit dl rm
fence_operations.hpp	1007	0644	edit dl rm
fence_operations_emulated.hpp	1294	0644	edit dl rm
fence_ops_gcc_atomic.hpp	2399	0644	edit dl rm
fence_ops_gcc_sync.hpp	1367	0644	edit dl rm
fence_ops_linux_arm.hpp	1792	0644	edit dl rm
fence_ops_windows.hpp	1848	0644	edit dl rm
float_sizes.hpp	7570	0644	edit dl rm
footer.hpp	505	0644	edit dl rm
fp_operations.hpp	807	0644	edit dl rm
fp_operations_fwd.hpp	1001	0644	edit dl rm
fp_ops_emulated.hpp	2714	0644	edit dl rm
fp_ops_generic.hpp	2919	0644	edit dl rm
futex.hpp	5388	0644	edit dl rm
gcc_arm_asm_common.hpp	4031	0644	edit dl rm
gcc_atomic_memory_order_utils.hpp	2804	0644	edit dl rm
header.hpp	2624	0644	edit dl rm
integral_conversions.hpp	4306	0644	edit dl rm
interlocked.hpp	34503	0644	edit dl rm
intptr.hpp	992	0644	edit dl rm
int_sizes.hpp	4987	0644	edit dl rm
link.hpp	1534	0644	edit dl rm
lock_pool.hpp	4689	0644	edit dl rm
memory_order_utils.hpp	1576	0644	edit dl rm
once_flag.hpp	1136	0644	edit dl rm
ops_gcc_aarch32_common.hpp	1577	0644	edit dl rm
ops_gcc_aarch64_common.hpp	1467	0644	edit dl rm
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pause.hpp	1494	0644	edit dl rm
platform.hpp	7210	0644	edit dl rm
storage_traits.hpp	5448	0644	edit dl rm
string_ops.hpp	1719	0644	edit dl rm
wait_capabilities.hpp	16861	0644	edit dl rm
wait_caps_dragonfly_umtx.hpp	1055	0644	edit dl rm
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wait_operations.hpp	828	0644	edit dl rm
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wait_ops_windows.hpp	4848	0644	edit dl rm

Edit: /usr/include/boost/atomic/detail/core_ops_gcc_sync.hpp (10690B)

/*
 * 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) 2011 Helge Bahmann
 * Copyright (c) 2013 Tim Blechmann
 * Copyright (c) 2014 Andrey Semashev
 */
/*!
 * \file   atomic/detail/core_ops_gcc_sync.hpp
 *
 * This header contains implementation of the \c core_operations template.
 */

#ifndef BOOST_ATOMIC_DETAIL_CORE_OPS_GCC_SYNC_HPP_INCLUDED_
#define BOOST_ATOMIC_DETAIL_CORE_OPS_GCC_SYNC_HPP_INCLUDED_

#include <cstddef>
#include <boost/memory_order.hpp>
#include <boost/atomic/detail/config.hpp>
#include <boost/atomic/detail/storage_traits.hpp>
#include <boost/atomic/detail/core_operations_fwd.hpp>
#include <boost/atomic/detail/extending_cas_based_arithmetic.hpp>
#include <boost/atomic/detail/type_traits/integral_constant.hpp>
#include <boost/atomic/detail/capabilities.hpp>
#include <boost/atomic/detail/header.hpp>

#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif

namespace boost {
namespace atomics {
namespace detail {

struct core_operations_gcc_sync_base
{
    static BOOST_CONSTEXPR_OR_CONST bool full_cas_based = false;
    static BOOST_CONSTEXPR_OR_CONST bool is_always_lock_free = true;

static BOOST_FORCEINLINE void fence_before_store(memory_order order) BOOST_NOEXCEPT
    {
        if ((static_cast< unsigned int >(order) & static_cast< unsigned int >(memory_order_release)) != 0u)
            __sync_synchronize();
    }

static BOOST_FORCEINLINE void fence_after_store(memory_order order) BOOST_NOEXCEPT
    {
        if (order == memory_order_seq_cst)
            __sync_synchronize();
    }

static BOOST_FORCEINLINE void fence_after_load(memory_order order) BOOST_NOEXCEPT
    {
        if ((static_cast< unsigned int >(order) & (static_cast< unsigned int >(memory_order_acquire) | static_cast< unsigned int >(memory_order_consume))) != 0u)
            __sync_synchronize();
    }
};

template< std::size_t Size, bool Signed, bool Interprocess >
struct core_operations_gcc_sync :
    public core_operations_gcc_sync_base
{
    typedef typename storage_traits< Size >::type storage_type;

static BOOST_CONSTEXPR_OR_CONST std::size_t storage_size = Size;
    static BOOST_CONSTEXPR_OR_CONST std::size_t storage_alignment = storage_traits< storage_size >::alignment;
    static BOOST_CONSTEXPR_OR_CONST bool is_signed = Signed;
    static BOOST_CONSTEXPR_OR_CONST bool is_interprocess = Interprocess;

// In general, we cannot guarantee atomicity of plain loads and stores of anything larger than a single byte on
    // an arbitrary CPU architecture. However, all modern architectures seem to guarantee atomic loads and stores of
    // suitably aligned objects of up to a pointer size. For larger objects we should probably use intrinsics to guarantee
    // atomicity. If there appears an architecture where this doesn't hold, this threshold needs to be updated (patches are welcome).
    typedef atomics::detail::integral_constant< bool, storage_size <= sizeof(void*) > plain_stores_loads_are_atomic;

static BOOST_FORCEINLINE void store(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
    {
        store(storage, v, order, plain_stores_loads_are_atomic());
    }

static BOOST_FORCEINLINE void store(storage_type volatile& storage, storage_type v, memory_order order, atomics::detail::true_type) BOOST_NOEXCEPT
    {
        fence_before_store(order);
        storage = v;
        fence_after_store(order);
    }

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

static BOOST_FORCEINLINE storage_type load(storage_type const volatile& storage, memory_order order) BOOST_NOEXCEPT
    {
        return load(storage, order, plain_stores_loads_are_atomic());
    }

static BOOST_FORCEINLINE storage_type load(storage_type const volatile& storage, memory_order order, atomics::detail::true_type) BOOST_NOEXCEPT
    {
        storage_type v = storage;
        fence_after_load(order);
        return v;
    }

static BOOST_FORCEINLINE storage_type load(storage_type const volatile& storage, memory_order, atomics::detail::false_type) BOOST_NOEXCEPT
    {
        // Note: don't use fetch_add or other arithmetics here since storage_type may not be an arithmetic type.
        storage_type expected = storage_type();
        storage_type desired = expected;
        // We don't care if CAS succeeds or not. If it does, it will just write the same value there was before.
        return __sync_val_compare_and_swap(const_cast< storage_type volatile* >(&storage), expected, desired);
    }

static BOOST_FORCEINLINE storage_type fetch_add(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
    {
        return __sync_fetch_and_add(&storage, v);
    }

static BOOST_FORCEINLINE storage_type fetch_sub(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
    {
        return __sync_fetch_and_sub(&storage, v);
    }

static BOOST_FORCEINLINE storage_type exchange(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
    {
        // GCC docs mention that not all architectures may support full exchange semantics for this intrinsic. However, GCC's implementation of
        // std::atomic<> uses this intrinsic unconditionally. We do so as well. In case if some architectures actually don't support this, we can always
        // add a check here and fall back to a CAS loop.
        if ((static_cast< unsigned int >(order) & static_cast< unsigned int >(memory_order_release)) != 0u)
            __sync_synchronize();
        return __sync_lock_test_and_set(&storage, v);
    }

static BOOST_FORCEINLINE bool compare_exchange_strong(
        storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order, memory_order) BOOST_NOEXCEPT
    {
        storage_type expected2 = expected;
        storage_type old_val = __sync_val_compare_and_swap(&storage, expected2, desired);

if (old_val == expected2)
        {
            return true;
        }
        else
        {
            expected = old_val;
            return false;
        }
    }

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 compare_exchange_strong(storage, expected, desired, success_order, failure_order);
    }

static BOOST_FORCEINLINE storage_type fetch_and(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
    {
        return __sync_fetch_and_and(&storage, v);
    }

static BOOST_FORCEINLINE storage_type fetch_or(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
    {
        return __sync_fetch_and_or(&storage, v);
    }

static BOOST_FORCEINLINE storage_type fetch_xor(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
    {
        return __sync_fetch_and_xor(&storage, v);
    }

static BOOST_FORCEINLINE bool test_and_set(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT
    {
        if ((static_cast< unsigned int >(order) & static_cast< unsigned int >(memory_order_release)) != 0u)
            __sync_synchronize();
        return !!__sync_lock_test_and_set(&storage, 1);
    }

static BOOST_FORCEINLINE void clear(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT
    {
        __sync_lock_release(&storage);
        if (order == memory_order_seq_cst)
            __sync_synchronize();
    }
};

#if BOOST_ATOMIC_INT8_LOCK_FREE > 0
template< bool Signed, bool Interprocess >
struct core_operations< 1u, Signed, Interprocess > :
#if defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_1)
    public core_operations_gcc_sync< 1u, Signed, Interprocess >
#elif defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_2)
    public extending_cas_based_arithmetic< core_operations_gcc_sync< 2u, Signed, Interprocess >, 1u, Signed >
#elif defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)
    public extending_cas_based_arithmetic< core_operations_gcc_sync< 4u, Signed, Interprocess >, 1u, Signed >
#elif defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_8)
    public extending_cas_based_arithmetic< core_operations_gcc_sync< 8u, Signed, Interprocess >, 1u, Signed >
#else
    public extending_cas_based_arithmetic< core_operations_gcc_sync< 16u, Signed, Interprocess >, 1u, Signed >
#endif
{
};
#endif

#if BOOST_ATOMIC_INT16_LOCK_FREE > 0
template< bool Signed, bool Interprocess >
struct core_operations< 2u, Signed, Interprocess > :
#if defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_2)
    public core_operations_gcc_sync< 2u, Signed, Interprocess >
#elif defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)
    public extending_cas_based_arithmetic< core_operations_gcc_sync< 4u, Signed, Interprocess >, 2u, Signed >
#elif defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_8)
    public extending_cas_based_arithmetic< core_operations_gcc_sync< 8u, Signed, Interprocess >, 2u, Signed >
#else
    public extending_cas_based_arithmetic< core_operations_gcc_sync< 16u, Signed, Interprocess >, 2u, Signed >
#endif
{
};
#endif

#if BOOST_ATOMIC_INT32_LOCK_FREE > 0
template< bool Signed, bool Interprocess >
struct core_operations< 4u, Signed, Interprocess > :
#if defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)
    public core_operations_gcc_sync< 4u, Signed, Interprocess >
#elif defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_8)
    public extending_cas_based_arithmetic< core_operations_gcc_sync< 8u, Signed, Interprocess >, 4u, Signed >
#else
    public extending_cas_based_arithmetic< core_operations_gcc_sync< 16u, Signed, Interprocess >, 4u, Signed >
#endif
{
};
#endif

#if BOOST_ATOMIC_INT64_LOCK_FREE > 0
template< bool Signed, bool Interprocess >
struct core_operations< 8u, Signed, Interprocess > :
#if defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_8)
    public core_operations_gcc_sync< 8u, Signed, Interprocess >
#else
    public extending_cas_based_arithmetic< core_operations_gcc_sync< 16u, Signed, Interprocess >, 8u, Signed >
#endif
{
};
#endif

#if BOOST_ATOMIC_INT128_LOCK_FREE > 0
template< bool Signed, bool Interprocess >
struct core_operations< 16u, Signed, Interprocess > :
    public core_operations_gcc_sync< 16u, Signed, Interprocess >
{
};
#endif

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

#include <boost/atomic/detail/footer.hpp>

#endif // BOOST_ATOMIC_DETAIL_CORE_OPS_GCC_SYNC_HPP_INCLUDED_

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