Limits.hpp

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// The Reactive C++ Toolbox.
// Copyright (C) 2013-2019 Swirly Cloud Limited
// Copyright (C) 2021 Reactive Markets Limited
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
#ifndef TOOLBOX_SYS_LIMITS_HPP
#define TOOLBOX_SYS_LIMITS_HPP
 
#include <toolbox/util/Math.hpp>
 
namespace toolbox {
inline namespace sys {
 
// Assumptions:
// sysconf(_SC_LEVEL1_DCACHE_LINESIZE) == 64
// sysconf(_SC_PAGESIZE) == 4096
 
enum : std::size_t {
    CacheLineBits = 6,
    CacheLineSize = 1 << CacheLineBits,
    PageBits = 12,
    PageSize = 1 << PageBits,
    MaxLogLine = 4096
};
 
constexpr std::size_t ceil_cache_line(std::size_t size) noexcept
{
    return ceil_pow2<CacheLineBits>(size);
}
 
constexpr std::size_t ceil_page(std::size_t size) noexcept
{
    return ceil_pow2<PageBits>(size);
}
 
} // namespace sys
} // namespace toolbox
 
#endif // TOOLBOX_SYS_LIMITS_HPP