265 lines
7.2 KiB
C++
265 lines
7.2 KiB
C++
#ifndef BOOST_ATOMIC_DETAIL_CAS64STRONG_HPP
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#define BOOST_ATOMIC_DETAIL_CAS64STRONG_HPP
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// Distributed under the Boost Software License, Version 1.0.
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// Copyright (c) 2011 Helge Bahmann
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// Copyright (c) 2013 Tim Blechmann
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// Build 64-bit atomic operation on integers/UDTs from platform_cmpxchg64_strong
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// primitive. It is assumed that 64-bit loads/stores are not
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// atomic, so they are implemented through platform_load64/platform_store64.
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#include <string.h>
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#include <cstddef>
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#include <boost/cstdint.hpp>
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#include <boost/memory_order.hpp>
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#include <boost/atomic/detail/config.hpp>
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#include <boost/atomic/detail/base.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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#pragma once
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#endif
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namespace boost {
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namespace atomics {
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namespace detail {
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/* integral types */
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template<typename T, bool Sign>
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class base_atomic<T, int, 8, Sign>
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{
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private:
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typedef base_atomic this_type;
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typedef T value_type;
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typedef T difference_type;
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protected:
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typedef value_type value_arg_type;
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public:
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BOOST_DEFAULTED_FUNCTION(base_atomic(void), {})
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BOOST_CONSTEXPR explicit base_atomic(value_type v) BOOST_NOEXCEPT : v_(v) {}
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void
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store(value_type v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
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{
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platform_fence_before_store(order);
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platform_store64(v, &v_);
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platform_fence_after_store(order);
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}
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value_type
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load(memory_order order = memory_order_seq_cst) const volatile BOOST_NOEXCEPT
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{
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value_type v = platform_load64(&v_);
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platform_fence_after_load(order);
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return v;
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}
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value_type
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exchange(value_type v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
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{
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value_type original = load(memory_order_relaxed);
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do {
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} while (!compare_exchange_weak(original, v, order, memory_order_relaxed));
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return original;
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}
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bool
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compare_exchange_weak(
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value_type & expected,
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value_type desired,
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memory_order success_order,
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memory_order failure_order) volatile BOOST_NOEXCEPT
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{
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return compare_exchange_strong(expected, desired, success_order, failure_order);
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}
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bool
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compare_exchange_strong(
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value_type & expected,
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value_type desired,
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memory_order success_order,
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memory_order failure_order) volatile BOOST_NOEXCEPT
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{
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platform_fence_before(success_order);
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bool success = platform_cmpxchg64_strong(expected, desired, &v_);
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if (success) {
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platform_fence_after(success_order);
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} else {
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platform_fence_after(failure_order);
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}
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return success;
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}
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value_type
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fetch_add(value_type v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
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{
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value_type original = load(memory_order_relaxed);
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do {
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} while (!compare_exchange_weak(original, original + v, order, memory_order_relaxed));
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return original;
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}
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value_type
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fetch_sub(value_type v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
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{
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value_type original = load(memory_order_relaxed);
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do {
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} while (!compare_exchange_weak(original, original - v, order, memory_order_relaxed));
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return original;
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}
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value_type
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fetch_and(value_type v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
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{
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value_type original = load(memory_order_relaxed);
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do {
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} while (!compare_exchange_weak(original, original & v, order, memory_order_relaxed));
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return original;
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}
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value_type
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fetch_or(value_type v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
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{
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value_type original = load(memory_order_relaxed);
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do {
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} while (!compare_exchange_weak(original, original | v, order, memory_order_relaxed));
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return original;
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}
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value_type
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fetch_xor(value_type v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
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{
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value_type original = load(memory_order_relaxed);
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do {
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} while (!compare_exchange_weak(original, original ^ v, order, memory_order_relaxed));
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return original;
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}
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bool
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is_lock_free(void) const volatile BOOST_NOEXCEPT
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{
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return true;
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}
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BOOST_ATOMIC_DECLARE_INTEGRAL_OPERATORS
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BOOST_DELETED_FUNCTION(base_atomic(base_atomic const&))
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BOOST_DELETED_FUNCTION(base_atomic& operator=(base_atomic const&))
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private:
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value_type v_;
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};
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/* generic types */
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template<typename T, bool Sign>
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class base_atomic<T, void, 8, Sign>
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{
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private:
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typedef base_atomic this_type;
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typedef T value_type;
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typedef uint64_t storage_type;
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protected:
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typedef value_type const& value_arg_type;
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public:
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BOOST_DEFAULTED_FUNCTION(base_atomic(void), {})
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explicit base_atomic(value_type const& v) BOOST_NOEXCEPT : v_(0)
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{
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memcpy(&v_, &v, sizeof(value_type));
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}
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void
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store(value_type const& value, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
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{
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storage_type value_s = 0;
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memcpy(&value_s, &value, sizeof(value_type));
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platform_fence_before_store(order);
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platform_store64(value_s, &v_);
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platform_fence_after_store(order);
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}
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value_type
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load(memory_order order = memory_order_seq_cst) const volatile BOOST_NOEXCEPT
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{
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storage_type value_s = platform_load64(&v_);
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platform_fence_after_load(order);
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value_type value;
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memcpy(&value, &value_s, sizeof(value_type));
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return value;
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}
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value_type
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exchange(value_type const& v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
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{
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value_type original = load(memory_order_relaxed);
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do {
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} while (!compare_exchange_weak(original, v, order, memory_order_relaxed));
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return original;
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}
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bool
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compare_exchange_weak(
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value_type & expected,
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value_type const& desired,
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memory_order success_order,
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memory_order failure_order) volatile BOOST_NOEXCEPT
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{
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return compare_exchange_strong(expected, desired, success_order, failure_order);
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}
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bool
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compare_exchange_strong(
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value_type & expected,
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value_type const& desired,
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memory_order success_order,
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memory_order failure_order) volatile BOOST_NOEXCEPT
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{
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storage_type expected_s = 0, desired_s = 0;
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memcpy(&expected_s, &expected, sizeof(value_type));
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memcpy(&desired_s, &desired, sizeof(value_type));
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platform_fence_before(success_order);
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bool success = platform_cmpxchg64_strong(expected_s, desired_s, &v_);
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if (success) {
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platform_fence_after(success_order);
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} else {
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platform_fence_after(failure_order);
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memcpy(&expected, &expected_s, sizeof(value_type));
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}
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return success;
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}
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bool
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is_lock_free(void) const volatile BOOST_NOEXCEPT
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{
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return true;
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}
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BOOST_ATOMIC_DECLARE_BASE_OPERATORS
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BOOST_DELETED_FUNCTION(base_atomic(base_atomic const&))
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BOOST_DELETED_FUNCTION(base_atomic& operator=(base_atomic const&))
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private:
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storage_type v_;
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};
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}
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}
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}
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#endif
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