pool_data.hpp

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/*
 * Copyright 2019, Intel Corporation
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *       notice, this list of conditions and the following disclaimer.
 *
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
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 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 */
 
#ifndef LIBPMEMOBJ_CPP_POOL_DATA_HPP
#define LIBPMEMOBJ_CPP_POOL_DATA_HPP
 
#include <atomic>
#include <functional>
 
namespace pmem
{
 
namespace detail
{
 
struct pool_data {
    pool_data()
    {
        initialized = false;
    }
 
    /* Set cleanup function if not already set */
    void
    set_cleanup(std::function<void()> cleanup)
    {
        bool expected = false;
 
        /* this is only to protect from concurrent initializations,
         * there will be no concurrent reads */
        if (initialized.compare_exchange_strong(
                expected, true, std::memory_order_release,
                std::memory_order_relaxed)) {
            this->cleanup = cleanup;
        }
    }
 
    std::atomic<bool> initialized;
    std::function<void()> cleanup;
};
 
} /* namespace detail */
 
} /* namespace pmem */
 
#endif /* LIBPMEMOBJ_CPP_POOL_DATA_HPP */