/usr/include/boost/atomic/detail
Edit: /usr/include/boost/atomic/detail/atomic_flag_impl.hpp (4525B)
/*
* 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) 2011 Helge Bahmann
* Copyright (c) 2013 Tim Blechmann
* Copyright (c) 2014, 2020 Andrey Semashev
*/
/*!
* \file atomic/detail/atomic_flag_impl.hpp
*
* This header contains implementation of \c atomic_flag.
*/
#ifndef BOOST_ATOMIC_DETAIL_ATOMIC_FLAG_IMPL_HPP_INCLUDED_
#define BOOST_ATOMIC_DETAIL_ATOMIC_FLAG_IMPL_HPP_INCLUDED_
#include
#include
#include
#include
#include
#include
#include
#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif
/*
* IMPLEMENTATION NOTE: All interface functions MUST be declared with BOOST_FORCEINLINE,
* see comment for convert_memory_order_to_gcc in gcc_atomic_memory_order_utils.hpp.
*/
namespace boost {
namespace atomics {
namespace detail {
#if defined(BOOST_ATOMIC_DETAIL_NO_CXX11_CONSTEXPR_UNION_INIT) || defined(BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX)
#define BOOST_ATOMIC_NO_ATOMIC_FLAG_INIT
#else
#define BOOST_ATOMIC_FLAG_INIT {}
#endif
//! Atomic flag implementation
template< bool IsInterprocess >
struct atomic_flag_impl
{
// Prefer 4-byte storage as most platforms support waiting/notifying operations without a lock pool for 32-bit integers
typedef atomics::detail::core_operations< 4u, false, IsInterprocess > core_operations;
typedef atomics::detail::wait_operations< core_operations > wait_operations;
typedef typename core_operations::storage_type storage_type;
static BOOST_CONSTEXPR_OR_CONST bool is_always_lock_free = core_operations::is_always_lock_free;
static BOOST_CONSTEXPR_OR_CONST bool always_has_native_wait_notify = wait_operations::always_has_native_wait_notify;
BOOST_ATOMIC_DETAIL_ALIGNED_VAR_TPL(core_operations::storage_alignment, storage_type, m_storage);
BOOST_FORCEINLINE BOOST_ATOMIC_DETAIL_CONSTEXPR_UNION_INIT atomic_flag_impl() BOOST_NOEXCEPT : m_storage(0u)
{
}
BOOST_FORCEINLINE bool is_lock_free() const volatile BOOST_NOEXCEPT
{
return is_always_lock_free;
}
BOOST_FORCEINLINE bool has_native_wait_notify() const volatile BOOST_NOEXCEPT
{
return wait_operations::has_native_wait_notify(m_storage);
}
BOOST_FORCEINLINE bool test(memory_order order = memory_order_seq_cst) const volatile BOOST_NOEXCEPT
{
BOOST_ASSERT(order != memory_order_release);
BOOST_ASSERT(order != memory_order_acq_rel);
return !!core_operations::load(m_storage, order);
}
BOOST_FORCEINLINE bool test_and_set(memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
{
return core_operations::test_and_set(m_storage, order);
}
BOOST_FORCEINLINE void clear(memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
{
BOOST_ASSERT(order != memory_order_consume);
BOOST_ASSERT(order != memory_order_acquire);
BOOST_ASSERT(order != memory_order_acq_rel);
core_operations::clear(m_storage, order);
}
BOOST_FORCEINLINE bool wait(bool old_val, memory_order order = memory_order_seq_cst) const volatile BOOST_NOEXCEPT
{
BOOST_ASSERT(order != memory_order_release);
BOOST_ASSERT(order != memory_order_acq_rel);
return !!wait_operations::wait(m_storage, static_cast< storage_type >(old_val), order);
}
BOOST_FORCEINLINE void notify_one() volatile BOOST_NOEXCEPT
{
wait_operations::notify_one(m_storage);
}
BOOST_FORCEINLINE void notify_all() volatile BOOST_NOEXCEPT
{
wait_operations::notify_all(m_storage);
}
BOOST_DELETED_FUNCTION(atomic_flag_impl(atomic_flag_impl const&))
BOOST_DELETED_FUNCTION(atomic_flag_impl& operator= (atomic_flag_impl const&))
};
#if defined(BOOST_NO_CXX17_INLINE_VARIABLES)
template< bool IsInterprocess >
BOOST_CONSTEXPR_OR_CONST bool atomic_flag_impl< IsInterprocess >::is_always_lock_free;
template< bool IsInterprocess >
BOOST_CONSTEXPR_OR_CONST bool atomic_flag_impl< IsInterprocess >::always_has_native_wait_notify;
#endif
} // namespace detail
} // namespace atomics
} // namespace boost
#include
#endif // BOOST_ATOMIC_DETAIL_ATOMIC_FLAG_IMPL_HPP_INCLUDED_