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Diffstat (limited to 'immer/heap/thread_local_free_list_heap.hpp')
-rw-r--r-- | immer/heap/thread_local_free_list_heap.hpp | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/immer/heap/thread_local_free_list_heap.hpp b/immer/heap/thread_local_free_list_heap.hpp new file mode 100644 index 000000000000..9f7f48f43f6c --- /dev/null +++ b/immer/heap/thread_local_free_list_heap.hpp @@ -0,0 +1,55 @@ +// +// immer: immutable data structures for C++ +// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente +// +// This software is distributed under the Boost Software License, Version 1.0. +// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt +// + +#pragma once + +#include <immer/heap/unsafe_free_list_heap.hpp> + +namespace immer { +namespace detail { + +template <typename Heap> +struct thread_local_free_list_storage +{ + struct head_t + { + free_list_node* data; + std::size_t count; + + ~head_t() { Heap::clear(); } + }; + + static head_t& head() + { + thread_local static head_t head_{nullptr, 0}; + return head_; + } +}; + +} // namespace detail + +/*! + * Adaptor that does not release the memory to the parent heap but + * instead it keeps the memory in a `thread_local` global free + * list. Must be preceded by a `with_data<free_list_node, ...>` heap + * adaptor. When the current thread finishes, the memory is returned + * to the parent heap. + * + * @tparam Size Maximum size of the objects to be allocated. + * @tparam Limit Maximum number of elements to keep in the free list. + * @tparam Base Type of the parent heap. + */ +template <std::size_t Size, std::size_t Limit, typename Base> +struct thread_local_free_list_heap + : detail::unsafe_free_list_heap_impl<detail::thread_local_free_list_storage, + Size, + Limit, + Base> +{}; + +} // namespace immer |