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The inter-process atomics have ipc_ prefixes: ipc_atomic, ipc_atomic_ref and ipc_atomic_flag. These types are similar to their unprefixed counterparts with the following distinctions: - The operations are provided with an added precondition that is_lock_free() returns true. - All operations, including waiting/notifying operations, are address-free, so the types are suitable for inter-process communication. - The new has_native_wait_notify() operation and always_has_native_wait_notify static constant allow to test if the target platform has native support for address-free waiting/notifying operations. If it does not, a generic implementation is used based on a busy wait. - The new set of capability macros added. The macros are named BOOST_ATOMIC_HAS_NATIVE_<T>_IPC_WAIT_NOTIFY and indicate whether address-free waiting/notifying operations are supported natively for a given type. Additionally, to unify interface and implementation of different components, the has_native_wait_notify() operation and always_has_native_wait_notify static constant were added to non-IPC atomic types as well. Added BOOST_ATOMIC_HAS_NATIVE_<T>_WAIT_NOTIFY capability macros to indicate native support for inter-thread waiting/notifying operations. Also, added is_lock_free() and is_always_lock_free to atomic_flag. This commit adds implementation, docs and tests.
72 lines
2.0 KiB
C++
72 lines
2.0 KiB
C++
// Copyright (c) 2020 Andrey Semashev
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//
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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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#ifndef BOOST_ATOMIC_TEST_ATOMIC_WRAPPER_HPP_INCLUDED_
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#define BOOST_ATOMIC_TEST_ATOMIC_WRAPPER_HPP_INCLUDED_
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#include <boost/atomic/atomic.hpp>
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#include <boost/atomic/atomic_ref.hpp>
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#include <boost/atomic/ipc_atomic.hpp>
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#include <boost/atomic/ipc_atomic_ref.hpp>
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#include <boost/config.hpp>
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#include "aligned_object.hpp"
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//! Wrapper type for atomic template
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template< typename T >
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struct atomic_wrapper
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{
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typedef boost::atomic< T > atomic_type;
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typedef atomic_type& atomic_reference_type;
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atomic_type a;
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BOOST_DEFAULTED_FUNCTION(atomic_wrapper(), {})
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explicit atomic_wrapper(T const& value) : a(value) {}
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};
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//! Wrapper type for atomic_ref template
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template< typename T >
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struct atomic_ref_wrapper
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{
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typedef boost::atomic_ref< T > atomic_type;
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typedef atomic_type const& atomic_reference_type;
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aligned_object< T, atomic_type::required_alignment > object;
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const atomic_type a;
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atomic_ref_wrapper() : a(object.get()) {}
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explicit atomic_ref_wrapper(T const& value) : object(value), a(object.get()) {}
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};
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//! Wrapper type for ipc_atomic template
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template< typename T >
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struct ipc_atomic_wrapper
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{
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typedef boost::ipc_atomic< T > atomic_type;
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typedef atomic_type& atomic_reference_type;
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atomic_type a;
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BOOST_DEFAULTED_FUNCTION(ipc_atomic_wrapper(), {})
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explicit ipc_atomic_wrapper(T const& value) : a(value) {}
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};
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//! Wrapper type for atomic_ref template
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template< typename T >
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struct ipc_atomic_ref_wrapper
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{
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typedef boost::ipc_atomic_ref< T > atomic_type;
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typedef atomic_type const& atomic_reference_type;
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aligned_object< T, atomic_type::required_alignment > object;
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const atomic_type a;
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ipc_atomic_ref_wrapper() : a(object.get()) {}
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explicit ipc_atomic_ref_wrapper(T const& value) : object(value), a(object.get()) {}
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};
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#endif // BOOST_ATOMIC_TEST_ATOMIC_WRAPPER_HPP_INCLUDED_
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