+++ /dev/null
-/*
- * 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) 2010 Helge Bahmann
- * Copyright (c) 2013 Tim Blechmann
- * Copyright (c) 2014 Andrey Semashev
- */
-/*!
- * \file atomic/detail/ops_gcc_sparc.hpp
- *
- * This header contains implementation of the \c operations template.
- */
-
-#ifndef BOOST_ATOMIC_DETAIL_OPS_GCC_SPARC_HPP_INCLUDED_
-#define BOOST_ATOMIC_DETAIL_OPS_GCC_SPARC_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/operations_fwd.hpp>
-#include <boost/atomic/capabilities.hpp>
-#include <boost/atomic/detail/ops_cas_based.hpp>
-#include <boost/atomic/detail/ops_extending_cas_based.hpp>
-
-#ifdef BOOST_HAS_PRAGMA_ONCE
-#pragma once
-#endif
-
-namespace boost {
-namespace atomics {
-namespace detail {
-
-struct gcc_sparc_cas_base
-{
- static BOOST_CONSTEXPR_OR_CONST bool full_cas_based = true;
- static BOOST_CONSTEXPR_OR_CONST bool is_always_lock_free = true;
-
- static BOOST_FORCEINLINE void fence_before(memory_order order) BOOST_NOEXCEPT
- {
- if (order == memory_order_seq_cst)
- __asm__ __volatile__ ("membar #Sync" ::: "memory");
- else if ((static_cast< unsigned int >(order) & static_cast< unsigned int >(memory_order_release)) != 0u)
- __asm__ __volatile__ ("membar #StoreStore | #LoadStore" ::: "memory");
- }
-
- static BOOST_FORCEINLINE void fence_after(memory_order order) BOOST_NOEXCEPT
- {
- if (order == memory_order_seq_cst)
- __asm__ __volatile__ ("membar #Sync" ::: "memory");
- else if ((static_cast< unsigned int >(order) & (static_cast< unsigned int >(memory_order_consume) | static_cast< unsigned int >(memory_order_acquire))) != 0u)
- __asm__ __volatile__ ("membar #StoreStore | #LoadStore" ::: "memory");
- }
-
- static BOOST_FORCEINLINE void fence_after_store(memory_order order) BOOST_NOEXCEPT
- {
- if (order == memory_order_seq_cst)
- __asm__ __volatile__ ("membar #Sync" ::: "memory");
- }
-};
-
-template< bool Signed >
-struct gcc_sparc_cas32 :
- public gcc_sparc_cas_base
-{
- typedef typename storage_traits< 4u >::type storage_type;
-
- static BOOST_CONSTEXPR_OR_CONST std::size_t storage_size = 4u;
- static BOOST_CONSTEXPR_OR_CONST std::size_t storage_alignment = 4u;
- static BOOST_CONSTEXPR_OR_CONST bool is_signed = Signed;
-
- static BOOST_FORCEINLINE void store(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
- {
- fence_before(order);
- storage = v;
- fence_after_store(order);
- }
-
- static BOOST_FORCEINLINE storage_type load(storage_type const volatile& storage, memory_order order) BOOST_NOEXCEPT
- {
- storage_type v = storage;
- fence_after(order);
- return v;
- }
-
- 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
- {
- fence_before(success_order);
- storage_type previous = expected;
- __asm__ __volatile__
- (
- "cas [%1], %2, %0"
- : "+r" (desired)
- : "r" (&storage), "r" (previous)
- : "memory"
- );
- const bool success = (desired == previous);
- if (success)
- fence_after(success_order);
- else
- fence_after(failure_order);
- expected = desired;
- return success;
- }
-
- 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 exchange(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
- {
- fence_before(order);
- __asm__ __volatile__
- (
- "swap [%1], %0"
- : "+r" (v)
- : "r" (&storage)
- : "memory"
- );
- fence_after(order);
- return v;
- }
-};
-
-template< bool Signed >
-struct operations< 4u, Signed > :
- public cas_based_operations< gcc_sparc_cas32< Signed > >
-{
-};
-
-template< bool Signed >
-struct operations< 1u, Signed > :
- public extending_cas_based_operations< operations< 4u, Signed >, 1u, Signed >
-{
-};
-
-template< bool Signed >
-struct operations< 2u, Signed > :
- public extending_cas_based_operations< operations< 4u, Signed >, 2u, Signed >
-{
-};
-
-template< bool Signed >
-struct gcc_sparc_cas64 :
- public gcc_sparc_cas_base
-{
- typedef typename storage_traits< 8u >::type storage_type;
-
- static BOOST_CONSTEXPR_OR_CONST std::size_t storage_size = 8u;
- static BOOST_CONSTEXPR_OR_CONST std::size_t storage_alignment = 8u;
- static BOOST_CONSTEXPR_OR_CONST bool is_signed = Signed;
-
- static BOOST_FORCEINLINE void store(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
- {
- fence_before(order);
- storage = v;
- fence_after_store(order);
- }
-
- static BOOST_FORCEINLINE storage_type load(storage_type const volatile& storage, memory_order order) BOOST_NOEXCEPT
- {
- storage_type v = storage;
- fence_after(order);
- return v;
- }
-
- 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
- {
- fence_before(success_order);
- storage_type previous = expected;
- __asm__ __volatile__
- (
- "casx [%1], %2, %0"
- : "+r" (desired)
- : "r" (&storage), "r" (previous)
- : "memory"
- );
- const bool success = (desired == previous);
- if (success)
- fence_after(success_order);
- else
- fence_after(failure_order);
- expected = desired;
- return success;
- }
-
- 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);
- }
-};
-
-template< bool Signed >
-struct operations< 8u, Signed > :
- public cas_based_operations< cas_based_exchange< gcc_sparc_cas64< Signed > > >
-{
-};
-
-
-BOOST_FORCEINLINE void thread_fence(memory_order order) BOOST_NOEXCEPT
-{
- switch (order)
- {
- case memory_order_release:
- __asm__ __volatile__ ("membar #StoreStore | #LoadStore" ::: "memory");
- break;
- case memory_order_consume:
- case memory_order_acquire:
- __asm__ __volatile__ ("membar #LoadLoad | #LoadStore" ::: "memory");
- break;
- case memory_order_acq_rel:
- __asm__ __volatile__ ("membar #LoadLoad | #LoadStore | #StoreStore" ::: "memory");
- break;
- case memory_order_seq_cst:
- __asm__ __volatile__ ("membar #Sync" ::: "memory");
- break;
- case memory_order_relaxed:
- default:
- break;
- }
-}
-
-BOOST_FORCEINLINE void signal_fence(memory_order order) BOOST_NOEXCEPT
-{
- if (order != memory_order_relaxed)
- __asm__ __volatile__ ("" ::: "memory");
-}
-
-} // namespace detail
-} // namespace atomics
-} // namespace boost
-
-#endif // BOOST_ATOMIC_DETAIL_OPS_GCC_SPARC_HPP_INCLUDED_
projects / ceph.git / blobdiff