make_persistent_array.hpp

Go to the documentation of this file.

/*
 * Copyright 2016-2018, 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
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef LIBPMEMOBJ_CPP_MAKE_PERSISTENT_ARRAY_HPP
#define LIBPMEMOBJ_CPP_MAKE_PERSISTENT_ARRAY_HPP

#include <libpmemobj++/detail/array_traits.hpp>
#include <libpmemobj++/detail/check_persistent_ptr_array.hpp>
#include <libpmemobj++/detail/common.hpp>
#include <libpmemobj++/detail/life.hpp>
#include <libpmemobj++/detail/pexceptions.hpp>
#include <libpmemobj/tx_base.h>

#include <cassert>
#include <limits>

namespace pmem
{

namespace obj
{

template <typename T>
typename detail::pp_if_array<T>::type
make_persistent(std::size_t N)
{
    typedef typename detail::pp_array_type<T>::type I;

    /*
     * Allowing N greater than ptrdiff_t max value would cause problems
     * with accessing array and calculating address difference between two
     * elements placed further apart than ptrdiff_t max value
     */
    assert(N <=
           static_cast<std::size_t>(std::numeric_limits<ptrdiff_t>::max()));

    if (pmemobj_tx_stage() != TX_STAGE_WORK)
        throw transaction_scope_error(
            "refusing to allocate memory outside of transaction scope");

    persistent_ptr<T> ptr =
        pmemobj_tx_alloc(sizeof(I) * N, detail::type_num<I>());

    if (ptr == nullptr)
        throw transaction_alloc_error(
            "failed to allocate persistent memory array");

    /*
     * When an exception is thrown from one of the constructors
     * we don't perform any cleanup - i.e. we don't call destructors
     * (unlike new[] operator), we only rely on transaction abort.
     * This approach was taken to ensure consistent behaviour for
     * case when transaction is aborted after make_persistent completes and
     * we have no way to call destructors.
     */
    for (std::size_t i = 0; i < N; ++i)
        detail::create<I>(ptr.get() + i);

    return ptr;
}

template <typename T>
typename detail::pp_if_size_array<T>::type
make_persistent()
{
    typedef typename detail::pp_array_type<T>::type I;
    enum { N = detail::pp_array_elems<T>::elems };

    if (pmemobj_tx_stage() != TX_STAGE_WORK)
        throw transaction_scope_error(
            "refusing to allocate memory outside of transaction scope");

    persistent_ptr<T> ptr =
        pmemobj_tx_alloc(sizeof(I) * N, detail::type_num<I>());

    if (ptr == nullptr)
        throw transaction_alloc_error(
            "failed to allocate persistent memory array");

    /*
     * When an exception is thrown from one of the constructors
     * we don't perform any cleanup - i.e. we don't call destructors
     * (unlike new[] operator), we only rely on transaction abort.
     * This approach was taken to ensure consistent behaviour for
     * case when transaction is aborted after make_persistent completes and
     * we have no way to call destructors.
     */
    for (std::size_t i = 0; i < N; ++i)
        detail::create<I>(ptr.get() + i);

    return ptr;
}

template <typename T>
void
delete_persistent(typename detail::pp_if_array<T>::type ptr, std::size_t N)
{
    typedef typename detail::pp_array_type<T>::type I;

    if (pmemobj_tx_stage() != TX_STAGE_WORK)
        throw transaction_scope_error(
            "refusing to free memory outside of transaction scope");

    if (ptr == nullptr)
        return;

    for (std::size_t i = 0; i < N; ++i)
        detail::destroy<I>(ptr[N - 1 - i]);

    if (pmemobj_tx_free(*ptr.raw_ptr()) != 0)
        throw transaction_free_error(
            "failed to delete persistent memory object");
}

template <typename T>
void
delete_persistent(typename detail::pp_if_size_array<T>::type ptr)
{
    typedef typename detail::pp_array_type<T>::type I;
    enum { N = detail::pp_array_elems<T>::elems };

    if (pmemobj_tx_stage() != TX_STAGE_WORK)
        throw transaction_scope_error(
            "refusing to free memory outside of transaction scope");

    if (ptr == nullptr)
        return;

    for (std::size_t i = 0; i < N; ++i)
        detail::destroy<I>(ptr[N - 1 - i]);

    if (pmemobj_tx_free(*ptr.raw_ptr()) != 0)
        throw transaction_free_error(
            "failed to delete persistent memory object");
}

} /* namespace obj */

} /* namespace pmem */

#endif /* LIBPMEMOBJ_CPP_MAKE_PERSISTENT_ARRAY_HPP */