94 lines
2.2 KiB
C++
94 lines
2.2 KiB
C++
//
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// detail/thread_info_base.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2013 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef BOOST_ASIO_DETAIL_THREAD_INFO_BASE_HPP
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#define BOOST_ASIO_DETAIL_THREAD_INFO_BASE_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include <climits>
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#include <cstddef>
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#include <boost/asio/detail/noncopyable.hpp>
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#include <boost/asio/detail/push_options.hpp>
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namespace boost {
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namespace asio {
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namespace detail {
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class thread_info_base
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: private noncopyable
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{
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public:
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thread_info_base()
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: reusable_memory_(0)
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{
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}
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~thread_info_base()
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{
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if (reusable_memory_)
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::operator delete(reusable_memory_);
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}
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static void* allocate(thread_info_base* this_thread, std::size_t size)
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{
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if (this_thread && this_thread->reusable_memory_)
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{
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void* const pointer = this_thread->reusable_memory_;
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this_thread->reusable_memory_ = 0;
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unsigned char* const mem = static_cast<unsigned char*>(pointer);
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if (static_cast<std::size_t>(mem[0]) >= size)
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{
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mem[size] = mem[0];
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return pointer;
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}
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::operator delete(pointer);
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}
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void* const pointer = ::operator new(size + 1);
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unsigned char* const mem = static_cast<unsigned char*>(pointer);
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mem[size] = (size <= UCHAR_MAX) ? static_cast<unsigned char>(size) : 0;
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return pointer;
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}
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static void deallocate(thread_info_base* this_thread,
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void* pointer, std::size_t size)
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{
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if (size <= UCHAR_MAX)
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{
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if (this_thread && this_thread->reusable_memory_ == 0)
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{
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unsigned char* const mem = static_cast<unsigned char*>(pointer);
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mem[0] = mem[size];
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this_thread->reusable_memory_ = pointer;
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return;
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}
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}
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::operator delete(pointer);
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}
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private:
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void* reusable_memory_;
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};
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} // namespace detail
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} // namespace asio
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} // namespace boost
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#include <boost/asio/detail/pop_options.hpp>
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#endif // BOOST_ASIO_DETAIL_THREAD_INFO_BASE_HPP
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