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83 lines
2.4 KiB
C++
83 lines
2.4 KiB
C++
/* EQEMu: Everquest Server Emulator
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Copyright (C) EQEMu Development Team (http://eqemulator.net)
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY except by those people which sell it, which
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are required to give you total support for your newly bought product;
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without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 04111-1307 USA
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*/
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#pragma once
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#include "../expected.h"
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#include "shared_memory_error.h"
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#include "shared_memory_handle.h"
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#include <boost/interprocess/managed_mapped_file.hpp>
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#include <memory>
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namespace eq
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{
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namespace shared
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{
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namespace detail {
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typedef boost::interprocess::managed_mapped_file::segment_manager segment_manager_t;
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typedef boost::interprocess::allocator<void, segment_manager_t> allocator;
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}
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using allocator = detail::allocator;
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class shared_memory
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{
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public:
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shared_memory(const std::string &path, size_t sz) {
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_path = path;
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_sz = sz;
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}
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~shared_memory() = default;
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template<typename Ty>
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expected<handle<Ty>, shared_memory_error> map(const std::string& key) {
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if (!_memory) {
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try {
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_memory.reset(new boost::interprocess::managed_mapped_file(boost::interprocess::open_or_create, _path.c_str(), _sz));
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}
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catch (boost::interprocess::interprocess_exception) {
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return eq::make_unexpected(shared_memory_error::error_mapping_memory);
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}
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}
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handle<Ty> inst;
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auto ir = inst.initialize(key, _memory.get());
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if (ir) {
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return eq::expected<handle<Ty>, shared_memory_error>(inst);
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}
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else {
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return make_unexpected(ir.error());
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}
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return expected<handle<Ty>, shared_memory_error>(inst);
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}
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template<typename Ty, typename... Args>
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Ty construct(Args&&... args) {
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return Ty(std::forward<Args>(args)..., _memory->get_allocator<void>());
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}
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private:
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std::unique_ptr<boost::interprocess::managed_mapped_file> _memory;
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std::string _path;
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size_t _sz;
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};
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}
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}
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