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- /*
- * 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 <cstddef>
- #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_GCC) && (BOOST_GCC+0) >= 70000)) && (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. Unfortunately, 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
- * propagate constants even when functions are 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< std::size_t Size, bool Signed >
- struct gcc_atomic_operations
- {
- typedef typename make_storage_type< Size >::type storage_type;
- typedef typename make_storage_type< Size >::aligned aligned_storage_type;
- static BOOST_CONSTEXPR_OR_CONST std::size_t storage_size = Size;
- static BOOST_CONSTEXPR_OR_CONST bool is_signed = Signed;
- static BOOST_CONSTEXPR_OR_CONST bool full_cas_based = false;
- // Note: In the current implementation, gcc_atomic_operations are used only 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));
- }
- };
- #if BOOST_ATOMIC_INT128_LOCK_FREE > 0
- #if (defined(__clang__) || (defined(BOOST_GCC) && (BOOST_GCC+0) >= 70000)) && 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
- // A similar problem exists with gcc 7 as well, as it requires to link with libatomic to use 16-byte intrinsics:
- // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80878
- template< bool Signed >
- struct operations< 16u, Signed > :
- public cas_based_operations< gcc_dcas_x86_64< Signed > >
- {
- static BOOST_CONSTEXPR_OR_CONST std::size_t storage_size = 16u;
- static BOOST_CONSTEXPR_OR_CONST bool is_signed = Signed;
- };
- #else
- template< bool Signed >
- struct operations< 16u, Signed > :
- public gcc_atomic_operations< 16u, Signed >
- {
- };
- #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 > >
- {
- static BOOST_CONSTEXPR_OR_CONST std::size_t storage_size = 8u;
- static BOOST_CONSTEXPR_OR_CONST bool is_signed = 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< 16u, Signed >, 8u, Signed >
- {
- };
- #else
- template< bool Signed >
- struct operations< 8u, Signed > :
- public gcc_atomic_operations< 8u, Signed >
- {
- };
- #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< 8u, Signed >, 4u, Signed >
- {
- };
- #else // !defined(BOOST_ATOMIC_DETAIL_INT64_EXTENDED)
- template< bool Signed >
- struct operations< 4u, Signed > :
- public extending_cas_based_operations< gcc_atomic_operations< 16u, Signed >, 4u, Signed >
- {
- };
- #endif // !defined(BOOST_ATOMIC_DETAIL_INT64_EXTENDED)
- #else
- template< bool Signed >
- struct operations< 4u, Signed > :
- public gcc_atomic_operations< 4u, Signed >
- {
- };
- #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< 4u, Signed >, 2u, Signed >
- {
- };
- #elif !defined(BOOST_ATOMIC_DETAIL_INT64_EXTENDED)
- template< bool Signed >
- struct operations< 2u, Signed > :
- public extending_cas_based_operations< gcc_atomic_operations< 8u, Signed >, 2u, Signed >
- {
- };
- #else
- template< bool Signed >
- struct operations< 2u, Signed > :
- public extending_cas_based_operations< gcc_atomic_operations< 16u, Signed >, 2u, Signed >
- {
- };
- #endif
- #else
- template< bool Signed >
- struct operations< 2u, Signed > :
- public gcc_atomic_operations< 2u, Signed >
- {
- };
- #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< 2u, Signed >, 1u, Signed >
- {
- };
- #elif !defined(BOOST_ATOMIC_DETAIL_INT32_EXTENDED)
- template< bool Signed >
- struct operations< 1u, Signed > :
- public extending_cas_based_operations< gcc_atomic_operations< 4u, Signed >, 1u, Signed >
- {
- };
- #elif !defined(BOOST_ATOMIC_DETAIL_INT64_EXTENDED)
- template< bool Signed >
- struct operations< 1u, Signed > :
- public extending_cas_based_operations< gcc_atomic_operations< 8u, Signed >, 1u, Signed >
- {
- };
- #else
- template< bool Signed >
- struct operations< 1u, Signed > :
- public extending_cas_based_operations< gcc_atomic_operations< 16u, Signed >, 1u, Signed >
- {
- };
- #endif
- #else
- template< bool Signed >
- struct operations< 1u, Signed > :
- public gcc_atomic_operations< 1u, Signed >
- {
- };
- #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_
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