make_atomic_impl.hpp

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/*
 * Copyright 2016, Intel Corporation
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       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.
 *
 *     * Neither the name of the copyright holder nor the names of its
 *       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
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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 */

#ifndef LIBPMEMOBJ_MAKE_ATOMIC_IMPL_HPP
#define LIBPMEMOBJ_MAKE_ATOMIC_IMPL_HPP

#include <new>
#include <stddef.h>

#include "libpmemobj++/detail/array_traits.hpp"
#include "libpmemobj++/detail/integer_sequence.hpp"
#include "libpmemobj++/detail/life.hpp"

namespace nvml
{

namespace detail
{

/*
 * Calls the objects constructor.
 *
 * Unpacks the tuple to get constructor's parameters.
 */
template <typename T, size_t... Indices, typename... Args>
void
create_object(void *ptr, index_sequence<Indices...>, std::tuple<Args...> &tuple)
{
    new (ptr) T(std::get<Indices>(tuple)...);
}

/*
 * C-style function called by the allocator.
 *
 * The arg is a tuple containing constructor parameters.
 */
template <typename T, typename... Args>
int
obj_constructor(PMEMobjpool *pop, void *ptr, void *arg)
{
    auto *arg_pack = static_cast<std::tuple<Args...> *>(arg);

    typedef typename make_index_sequence<Args...>::type index;
    try {
        create_object<T>(ptr, index(), *arg_pack);
    } catch (...) {
        return -1;
    }

    pmemobj_persist(pop, ptr, sizeof(T));

    return 0;
}

/*
 * Constructor used for atomic array allocations.
 *
 * Returns -1 if an exception was thrown during T's construction,
 * 0 otherwise.
 */
template <typename T>
int
array_constructor(PMEMobjpool *pop, void *ptr, void *arg)
{
    std::size_t N = *static_cast<std::size_t *>(arg);

    T *tptr = static_cast<T *>(ptr);
    try {
        for (std::size_t i = 0; i < N; ++i)
            detail::create<T>(tptr + i);
    } catch (...) {
        return -1;
    }

    pmemobj_persist(pop, ptr, sizeof(T) * N);

    return 0;
}

} /* namespace detail */

} /* namespace nvml */

#endif /* LIBPMEMOBJ_MAKE_ATOMIC_IMPL_HPP */