make_persistent.hpp

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/*
 * Copyright 2016, Intel Corporation
 *
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 *
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#ifndef PMEMOBJ_MAKE_PERSISTENT_HPP
#define PMEMOBJ_MAKE_PERSISTENT_HPP

#include "libpmemobj++/detail/check_persistent_ptr_array.hpp"
#include "libpmemobj++/detail/common.hpp"
#include "libpmemobj++/detail/pexceptions.hpp"
#include "libpmemobj/tx_base.h"

#include <new>

namespace nvml
{

namespace obj
{

template <typename T, typename... Args>
typename detail::pp_if_not_array<T>::type
make_persistent(Args &&... args)
{
    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(T), detail::type_num<T>());

    if (ptr == nullptr)
        throw transaction_alloc_error("failed to allocate "
                          "persistent memory object");
    try {
        new (ptr.get()) T(args...);
    } catch (...) {
        pmemobj_tx_free(*ptr.raw_ptr());
        throw;
    }

    return ptr;
}

template <typename T>
void
delete_persistent(typename detail::pp_if_not_array<T>::type ptr)
{
    if (pmemobj_tx_stage() != TX_STAGE_WORK)
        throw transaction_scope_error(
            "refusing to free "
            "memory outside of transaction scope");

    if (ptr == nullptr)
        return;

    /*
     * At this point, everything in the object should be tracked
     * and reverted on transaction abort.
     */
    ptr->T::~T();

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

} /* namespace obj */

} /* namespace nvml */

#endif /* PMEMOBJ_MAKE_PERSISTENT_HPP */