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Diffstat (limited to 'boost/atomic/detail/ops_gcc_atomic.hpp')
-rw-r--r-- | boost/atomic/detail/ops_gcc_atomic.hpp | 380 |
1 files changed, 380 insertions, 0 deletions
diff --git a/boost/atomic/detail/ops_gcc_atomic.hpp b/boost/atomic/detail/ops_gcc_atomic.hpp new file mode 100644 index 0000000000..2e4c37bec7 --- /dev/null +++ b/boost/atomic/detail/ops_gcc_atomic.hpp @@ -0,0 +1,380 @@ +/* + * 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; + + 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 > +{ +}; + +#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 > +{ +}; + +#else + +template< bool Signed > +struct operations< 8u, Signed > : + public gcc_atomic_operations< typename make_storage_type< 8u, Signed >::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 > +{ +}; + +#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 > +{ +}; + +#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 > +{ +}; + +#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 > +{ +}; + +#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 > +{ +}; + +#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 > +{ +}; + +#endif + +#else + +template< bool Signed > +struct operations< 2u, Signed > : + public gcc_atomic_operations< typename make_storage_type< 2u, Signed >::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 > +{ +}; + +#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 > +{ +}; + +#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 > +{ +}; + +#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 > +{ +}; + +#endif + +#else + +template< bool Signed > +struct operations< 1u, Signed > : + public gcc_atomic_operations< typename make_storage_type< 1u, Signed >::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_ |