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//
// Copyright (c) 2018-2020 Manuel Pöter.
// Licensed under the MIT License. See LICENSE file in the project root for full license information.
//
#ifndef XENIUM_BACKOFF_HPP
#define XENIUM_BACKOFF_HPP
#include <xenium/detail/hardware.hpp>
#include <algorithm>
namespace xenium {
/**
* @brief Dummy backoff strategy that does nothing.
*/
struct no_backoff
{
void operator()() {}
};
/**
* @brief Simple backoff strategy that always perfoms a single `hardware_pause` operation.
*/
struct single_backoff
{
void operator()() { detail::hardware_pause(); }
};
template <unsigned Max>
struct exponential_backoff {
static_assert(Max > 0, "Max must be greater than zero. If you don't want to backoff use the `no_backoff` class.");
void operator()() {
for (unsigned i = 0; i < count; ++i)
detail::hardware_pause();
count = std::min(Max, count * 2);
}
unsigned count = 1;
};
}
#endif
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